5. 2:45-3:45pm Pre-exam Partial Denture (3dda MCQs 406 I Sok Ly)

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5. 2:45-3:45pm Pre-exam Partial Denture (3dda MCQs 406 I Sok Ly) - Quiz

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Questions and Answers
  • 1. 

    A clasp most common use is?:

    • A.

      Aker clasp

    • B.

      Ring clasp

    • C.

      Back action clasp

    • D.

      Embrasure

    Correct Answer
    A. Aker clasp
    Explanation
    The correct answer is Aker clasp. An Aker clasp is a type of clasp commonly used in dentistry. It is used to hold a partial denture in place by gripping onto the abutment teeth. Aker clasps are known for their durability and effectiveness in providing stability and retention for the denture. They are often preferred by dentists due to their ease of use and patient comfort.

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  • 2. 

    Infrabulge clasps originate:

    • A.

      Below the height of contour

    • B.

      Above the 12mm undercut areas

    • C.

      Above the occlusal surface of most premolars

    • D.

      Above the height of contour

    Correct Answer
    A. Below the height of contour
    Explanation
    Infrabulge clasps originate below the height of contour because they are designed to engage the undercut areas on the tooth surface. The height of contour is the widest part of the tooth, and placing the clasps below this point allows them to securely grip the tooth structure and provide stability for a removable partial denture. Placing the clasps above the height of contour or above the occlusal surface of most premolars would not allow them to engage the undercut areas effectively, compromising the retention and stability of the denture.

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  • 3. 

    Reciprocation between bracing and retentive components requires:

    • A.

      Correct timing of contact during seating and removed of RPD

    • B.

      I bars be used

    • C.

      Aker clasp be used

    • D.

      Bracing components contacts after retentive components

    Correct Answer
    A. Correct timing of contact during seating and removed of RPD
    Explanation
    The correct answer is "Correct timing of contact during seating and removal of RPD." This means that in order for the reciprocation between bracing and retentive components to work effectively, the contact between these components should be timed correctly during the seating of the removable partial denture (RPD), and the RPD should be properly removed when necessary. This ensures that the bracing and retentive components function together harmoniously to provide stability and retention for the RPD.

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  • 4. 

    The basic movement of mandible:

    • A.

      hinge ,lateral and translatory movement

    • B.

      Hinge movement

    • C.

      Translatory movement

    • D.

      Lateral movement

    Correct Answer
    A. hinge ,lateral and translatory movement
    Explanation
    The mandible, or jawbone, is capable of three main movements: hinge, lateral, and translatory. The hinge movement refers to the opening and closing motion of the jaw, similar to a hinge on a door. Lateral movement refers to the side-to-side motion of the jaw, allowing for chewing and grinding food. Translatory movement involves the forward and backward sliding of the jaw, allowing for actions such as protrusion and retrusion. These three movements collectively enable the mandible to perform various functions, including speaking, eating, and facial expressions.

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  • 5. 

    Maxillary major connectors most common use is:

    • A.

      Anterior posterior palatal strap

    • B.

      Full palatal strap

    • C.

      Palatal strap

    • D.

      Anterior palatal strap

    Correct Answer
    A. Anterior posterior palatal strap
    Explanation
    The correct answer is anterior posterior palatal strap. Maxillary major connectors are commonly used to provide stability and support to a removable partial denture. The anterior posterior palatal strap is a type of major connector that extends from the anterior region to the posterior region of the palate, providing optimal support and retention for the denture. It helps distribute the forces evenly across the palate and prevents displacement of the denture during function.

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  • 6. 

    Anterior posterior palatal strap especially use is:

    • A.

      Torus palatal

    • B.

      Maximum rigidity

    • C.

      Minimum bulk

    • D.

      Use in most cases

    Correct Answer
    A. Torus palatal
    Explanation
    The anterior posterior palatal strap is especially used for the torus palatal. This is because the torus palatal is a bony growth on the roof of the mouth that can cause discomfort and difficulty in wearing dental appliances. The strap provides maximum rigidity and minimum bulk, making it suitable for use in most cases involving the torus palatal.

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  • 7. 

    Which of the following maxillary major connectors possesses the least strength and rigidity?:

    • A.

      Horse –shoe

    • B.

      Anterior posterior palatal strap

    • C.

      Palatal plate

    • D.

      Modified palatal strap

    Correct Answer
    A. Horse –shoe
    Explanation
    The horse-shoe major connector possesses the least strength and rigidity among the options given. This is because the horse-shoe design only covers a small portion of the palate, leaving the rest unsupported. This lack of coverage and support reduces its strength and rigidity compared to the other options, such as the anterior posterior palatal strap, palatal plate, and modified palatal strap, which provide more extensive coverage and support.

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  • 8. 

    Which of the following clasps commonly utilize lingual undercut?:

    • A.

      Ring clasp

    • B.

      Extended arm clasp

    • C.

      Back action clasp

    • D.

      Embrasure clasp

    Correct Answer
    A. Ring clasp
    Explanation
    Ring clasps commonly utilize lingual undercut. Lingual undercut refers to the area on the lingual surface of a tooth where the gingival tissue is located below the height of contour. This allows for the retention of a clasp assembly. In the case of a ring clasp, the ring component is placed on the lingual surface of the tooth and engages the lingual undercut to provide stability and retention for the dental prosthesis. The other options listed, extended arm clasp, back action clasp, and embrasure clasp, do not typically utilize lingual undercut for retention.

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  • 9. 

    The external finish line is:

    • A.

      The external of framework metal and denture base plastic

    • B.

      The external of framework metal and supporting tissues

    • C.

      The external of framework metal and the natural teeth

    • D.

      The external of the natural teeth and the denture base plastic

    Correct Answer
    A. The external of framework metal and denture base plastic
    Explanation
    The correct answer is the external of framework metal and denture base plastic. This means that the external finish line refers to the junction between the metal framework and the plastic denture base. It is where these two materials meet and create the outer surface of the denture.

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  • 10. 

    Functions of a Major connector:

    • A.

      Unification, stress distribution, cross arch stabilization

    • B.

      Component of RPD connect to acrylic resin

    • C.

      Kind of metal chrome cobalt

    • D.

      Functions as one unit

    Correct Answer
    A. Unification, stress distribution, cross arch stabilization
    Explanation
    The major connector in a removable partial denture (RPD) serves multiple functions. Firstly, it provides unification by connecting various components of the RPD, such as the denture base, rests, and indirect retainers. This helps to distribute the forces evenly across the entire RPD. Secondly, the major connector aids in stress distribution by transmitting occlusal forces to the abutment teeth and the underlying bone, preventing excessive stress on any specific area. Lastly, it contributes to cross arch stabilization by providing stability and support to the RPD, preventing movement during function.

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  • 11. 

    Requirements of a Major connector:

    • A.

      Rigidity, non interference with tissues, minimize food impaction and unobtrusive

    • B.

      Connects various parts

    • C.

      Distributes functional loads to both teeth and mucosa

    • D.

      Partial denture acts as one unit

    Correct Answer
    A. Rigidity, non interference with tissues, minimize food impaction and unobtrusive
    Explanation
    The major connector in a partial denture must have rigidity to provide stability and support to the prosthesis. It should not interfere with the surrounding tissues to prevent any discomfort or irritation. The major connector should also be designed in a way that minimizes food impaction, making it easier for the patient to clean the denture. Lastly, it should be unobtrusive, blending in with the natural dentition and not causing any aesthetic concerns. These requirements ensure that the major connector functions effectively, distributes functional loads to both teeth and mucosa, and allows the partial denture to act as one unit.

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  • 12. 

    The superior border of mandibular lingual bar major connector should be:

    • A.

      At least 3mm from the tooth/ tissue junction

    • B.

      At least 3mm from the tooth/ junction

    • C.

      As far from gingival margin as possible

    • D.

      At least 3mm above the tooth/ junction

    Correct Answer
    A. At least 3mm from the tooth/ tissue junction
    Explanation
    The superior border of the mandibular lingual bar major connector should be at least 3mm from the tooth/tissue junction. This is important to ensure proper fit and function of the major connector. Placing it at least 3mm from the tooth/tissue junction allows for adequate clearance and prevents irritation or damage to the surrounding tissues. It also helps to maintain good oral hygiene by facilitating easy cleaning of the area.

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  • 13. 

    The internal finish line is:

    • A.

      The butt joint between the metal and resin acrylic on the tissue side of the edentulous area

    • B.

      The butt joint between the metal and resin acrylic on the outer surface of the RPD

    • C.

      A type of posterior palatal seal

    • D.

      A special type of above

    Correct Answer
    A. The butt joint between the metal and resin acrylic on the tissue side of the edentulous area
    Explanation
    The correct answer is the butt joint between the metal and resin acrylic on the tissue side of the edentulous area. This refers to the point where the metal framework of a removable partial denture (RPD) meets the resin acrylic material on the tissue side of the edentulous area, which is the area where there are no teeth. This joint is important for ensuring a secure and stable fit of the RPD, as it helps distribute forces evenly and prevent movement or discomfort for the patient.

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  • 14. 

    A combination clasp assembly generally has:

    • A.

      A bracing arm , a retentive arm and rests

    • B.

      A retentive arm ,rests and indirect retainer

    • C.

      Rests, a retentive arm and proximal plate

    • D.

      Rests , a bracing arm and proximal plate

    Correct Answer
    A. A bracing arm , a retentive arm and rests
    Explanation
    A combination clasp assembly generally has a bracing arm, a retentive arm, and rests. The bracing arm provides support and stability to the clasp assembly, while the retentive arm is responsible for retaining the clasp in place. Rests are used to distribute forces evenly and prevent damage to the abutment tooth. This combination of components allows for a secure and functional clasp assembly.

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  • 15. 

    The external finish line on a maxillary class 1 RPD originates from the lingual of the guide plane of the terminal abutment and ends:

    • A.

      At the hamular notch

    • B.

      In the glenoid fossa

    • C.

      Opposite the buccal pouch

    • D.

      Opposite stenon’s duct

    Correct Answer
    A. At the hamular notch
    Explanation
    The external finish line on a maxillary class 1 RPD originates from the lingual of the guide plane of the terminal abutment and ends at the hamular notch. The hamular notch is a bony landmark located at the posterior border of the maxillary tuberosity. This is an important point of reference for determining the extent of the prosthesis and ensuring proper fit and function. By ending the external finish line at the hamular notch, the prosthesis can be designed to provide adequate support and stability while avoiding interference with the surrounding anatomical structures.

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  • 16. 

    The Gridwork of Minor Connector on a maxillary class 1 RPD:

    • A.

      Does not cover the tuberosity

    • B.

      Covers the hamular notch

    • C.

      Covers the tuberosity

    • D.

      Covers the crest and tuberosity

    Correct Answer
    A. Does not cover the tuberosity
    Explanation
    The correct answer is "does not cover the tuberosity." In a maxillary class 1 removable partial denture (RPD), the gridwork of the minor connector is designed to connect the major connector to the rest of the RPD framework. It is important for the minor connector to be properly designed to avoid covering the tuberosity, which is the rounded prominence on the posterior aspect of the maxilla. By not covering the tuberosity, the RPD can provide better stability and avoid any potential discomfort or irritation to the patient.

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  • 17. 

    Occlusal rest preparation should be:

    • A.

      Spoon shaped, at least1/3 the bucco lingual width of the occlusal surface, at least 1m deep

    • B.

      Flat shaped, at least1/3 the bucco lingual width of the occlusal surface, at least 1mm deep

    • C.

      Pear shaped, at least 1/2 the bucco lingual width of the occlusal surface, at least 15mm deep

    • D.

      Teardrop shaped, at least 1/2 the bucco lingual width of the occlusal surface, at least 15mm deep

    Correct Answer
    A. Spoon shaped, at least1/3 the bucco lingual width of the occlusal surface, at least 1m deep
    Explanation
    The correct answer is "spoon shaped, at least 1/3 the bucco lingual width of the occlusal surface, at least 1mm deep." This is because occlusal rest preparation should have a shape that resembles a spoon, with a depth of at least 1mm. The preparation should also be at least 1/3 the bucco lingual width of the occlusal surface to provide sufficient support for the prosthesis. The option with "1m deep" is incorrect as it is an unrealistic depth for occlusal rest preparation.

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  • 18. 

    A lingual plate major connector may be selected be cause

    • A.

      The mandibular incisors are tilted lingually, mandibular tori present, high lingual frenum

    • B.

      The mandibular incisors are tilted facially, high floor of the mouth

    • C.

      The mandibular incisors are tilted facially, mandibular tori present ,high lingual fremum

    • D.

      The mandibular incisors are tilted lingually ,high floor of the mouth, high lingual frenum

    Correct Answer
    A. The mandibular incisors are tilted lingually, mandibular tori present, high lingual frenum
    Explanation
    A lingual plate major connector may be selected because the mandibular incisors are tilted lingually, mandibular tori are present, and there is a high lingual frenum. These factors indicate that there is limited space on the lingual side of the mandibular arch, making it necessary to use a lingual plate major connector to provide stability and support for the prosthesis. Additionally, the presence of mandibular tori and a high lingual frenum further restrict the available space, making a lingual plate major connector the most suitable option.

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  • 19. 

    An anterior posterior palatal strap major connector is less rigid than a horseshoe major connector because it (the AP strap) has less width:

    • A.

      The first statement is false but the reason is true

    • B.

      The first statement is true but the reason is false

    • C.

      The first statement is false and the reason is also false

    • D.

      The first statement is true and the reason is true

    Correct Answer
    A. The first statement is false but the reason is true
    Explanation
    The first statement is false because an anterior posterior palatal strap major connector is actually more rigid than a horseshoe major connector. However, the reason is true because the AP strap major connector has less width, which contributes to its increased rigidity.

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  • 20. 

    In a circumferential clasp assembly, the arms may extend into an undercut:

    • A.

      The retentive arm

    • B.

      The bracing arm

    • C.

      The reciprocating arm and retentive arm

    • D.

      The bracing arm and retentive arm

    Correct Answer
    A. The retentive arm
    Explanation
    In a circumferential clasp assembly, the retentive arm may extend into an undercut. The retentive arm is responsible for providing retention by engaging with the undercut on the tooth surface. This allows the clasp assembly to securely hold the prosthesis in place. The other arms mentioned, such as the bracing arm and reciprocating arm, do not typically extend into an undercut in this type of clasp assembly.

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  • 21. 

    Which of the following steps is done LAST ?:

    • A.

      Centric relation records

    • B.

      Rest preparation

    • C.

      Framework try in

    • D.

      Altered cast impression

    Correct Answer
    A. Centric relation records
    Explanation
    The step that is done last in the given options is centric relation records. Centric relation records are typically taken after the framework try-in and altered cast impression steps. This step involves recording the patient's jaw position in relation to the maxilla and mandible, which is important for accurate bite registration and ensuring proper alignment of the prosthesis.

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  • 22. 

    Direct retainer (clasps):

    • A.

      Help stabilize the RPD by controlling occlusal movement

    • B.

      Help stabilize the RPD by controlling gingival movement

    • C.

      May also function as indirect retainers

    • D.

      Prevent excessive biting forces on the abutment

    Correct Answer
    A. Help stabilize the RPD by controlling occlusal movement
    Explanation
    Direct retainers, such as clasps, help stabilize the removable partial denture (RPD) by controlling occlusal movement. This means that they prevent the RPD from moving or shifting during chewing or biting. By providing stability, the direct retainers ensure that the RPD stays in place and functions properly. They do not control gingival movement or prevent excessive biting forces on the abutment. Additionally, direct retainers may also function as indirect retainers, which help resist displacement of the RPD away from the tissue.

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  • 23. 

    What are the indications for a linguo plate as a major connector for a mandibular RPD?:

    • A.

      High floor of the mouth, high lingual frenum, lingual tori

    • B.

      Present high floor of the mouth and facially anterior teeth

    • C.

      Present high lingual frenum and buccally anterior teeth

    • D.

      Present lingual tori and big tongue

    Correct Answer
    A. High floor of the mouth, high lingual frenum, lingual tori
    Explanation
    A linguo plate as a major connector for a mandibular RPD is indicated when the patient has a high floor of the mouth, a high lingual frenum, and lingual tori. These conditions can make it difficult to achieve adequate retention and stability with other types of major connectors. The linguo plate can help distribute the forces evenly and provide better support for the RPD.

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  • 24. 

    Incisal rests should generally not used on maxillary incisors Why?:

    • A.

      Poor esthetics and interferences with opposing occlusion

    • B.

      For mandibular class 4 kennedy only

    • C.

      For maxillary class 4 kennedy only

    • D.

      For maxillary and mandibular class 1 and 2 kennedy

    Correct Answer
    A. Poor esthetics and interferences with opposing occlusion
    Explanation
    Incisal rests should generally not be used on maxillary incisors because they can result in poor esthetics and interfere with opposing occlusion. This means that using incisal rests on maxillary incisors may negatively impact the appearance of the teeth and cause problems with how the upper and lower teeth come together when biting or chewing. Therefore, it is generally not recommended to use incisal rests on maxillary incisors.

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  • 25. 

    Component of a clasp assembly are:

    • A.

      One or two rests, a retentive arm, a bracing or reciprocating element, one minor connectors, one major connector

    • B.

      One rest, a retentive arm , a bracing or reciprocating element, one minor connector

    • C.

      One minor connector, one major connector, one rest, two rests, one retentive arm, one bracing arm

    • D.

      Two minor connectors, one major connector , one rest, one retentive arm, one bracing or reciprocating element

    Correct Answer
    A. One or two rests, a retentive arm, a bracing or reciprocating element, one minor connectors, one major connector
    Explanation
    The correct answer is "One or two rests, a retentive arm, a bracing or reciprocating element, one minor connectors, one major connector." This answer includes all the components mentioned in the question, such as rests, retentive arm, bracing or reciprocating element, minor connector, and major connector.

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  • 26. 

    The basic philosophy of dental treatment for a partially edentulous patient:

    • A.

      Preserve what remains and restore what is missing

    • B.

      Replace the missing teeth

    • C.

      Improve the path of insertion

    • D.

      Reshape rotated teeth

    Correct Answer
    A. Preserve what remains and restore what is missing
    Explanation
    The basic philosophy of dental treatment for a partially edentulous patient is to preserve the remaining teeth and restore the missing ones. This approach aims to maintain the natural dentition as much as possible while addressing the gaps caused by missing teeth. Additionally, improving the path of insertion and reshaping rotated teeth may also be part of the treatment plan to ensure proper alignment and functionality of the restored teeth.

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  • 27. 

    Full palatal plate:

    • A.

      Maximum tissue support , connector long distal extension cases, six or less anterior teeth remain

    • B.

      Minimum tissue support

    • C.

      Connector of choice in short distal extension cases

    • D.

      Six or more anterior teeth remain

    Correct Answer
    A. Maximum tissue support , connector long distal extension cases, six or less anterior teeth remain
    Explanation
    The full palatal plate is the connector of choice in cases where there is a need for maximum tissue support, such as in long distal extension cases where there are six or fewer anterior teeth remaining. It provides extensive coverage and support to the underlying tissues, helping to distribute the forces evenly and prevent tissue irritation or discomfort. In cases where there are more than six anterior teeth remaining, a different connector may be used as the full palatal plate may not be necessary for adequate support.

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  • 28. 

    Physiologic Rest is a position of vertical dimension which can be recorded with:

    • A.

      Posselt’s envelope

    • B.

      Centric relation

    • C.

      Centric occlusion or MIP

    • D.

      Edge to edge incisor contact

    Correct Answer
    A. Posselt’s envelope
    Explanation
    Posselt's envelope is a recording technique used to measure the vertical dimension of occlusion. It involves tracing the path of the mandible as it moves from maximum opening to maximum closing. This recording provides information about the physiologic rest position, which is the position where the mandible naturally rests when the muscles are in a state of equilibrium. Therefore, Posselt's envelope is a suitable method for recording the physiologic rest position.

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  • 29. 

    A jaw which is moving in a ”left or right” motion would be called what type of movement:

    • A.

      Lateral

    • B.

      Lateral pure hinge

    • C.

      Lateral protrusion

    • D.

      Horizontally protrusive

    Correct Answer
    A. Lateral
    Explanation
    The correct answer is "lateral." In this context, "lateral" refers to a side-to-side movement, which is the characteristic motion described in the question. The other options do not accurately describe the type of movement specified.

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  • 30. 

    The condyle on the working side is called the working condyle, which is also known as the:

    • A.

      Rotating condyle

    • B.

      Orbiting condyle

    • C.

      Balancing condyle

    • D.

      Translatory condyle

    Correct Answer
    A. Rotating condyle
    Explanation
    The condyle on the working side is referred to as the rotating condyle because it is responsible for the rotational movement of the mandible during chewing or any other jaw movements. This condyle works in conjunction with the non-working condyle to allow smooth and coordinated movements of the jaw. The term "rotating condyle" accurately describes the function and role of this specific condyle in the jaw joint.

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  • 31. 

    Considering the design of an RPD for the mandibular arch…:

    • A.

      Dual path of insertion should be considered

    • B.

      Survey crowns should be done to correct the mesial tilt of the molar

    • C.

      Retentive clasps are required next to each edentulous space

    • D.

      The lingual plate would be the major connector of space

    Correct Answer
    A. Dual path of insertion should be considered
    Explanation
    The correct answer is "Dual path of insertion should be considered." This means that when designing a removable partial denture (RPD) for the mandibular arch, it is important to consider having two different paths of insertion. This allows for easier insertion and removal of the denture, as well as improved stability and retention. Having dual paths of insertion also helps distribute the forces evenly on the abutment teeth, reducing the risk of damage or discomfort.

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  • 32. 

    Which one of the following Kennedy classes of RPD, never has an axis of rotation?:

    • A.

      Class III of Kennedy

    • B.

      Class I of Kennedy

    • C.

      Class II of Kennedy

    • D.

      Class IV of Kennedy

    Correct Answer
    A. Class III of Kennedy
    Explanation
    Class III of Kennedy never has an axis of rotation because it is a unilateral partially edentulous arch where there is no tooth support on one side of the arch. This means that there is no tooth or teeth that can serve as a fulcrum for rotation. Class III RPDs rely on other forms of support, such as tissue support or tooth-tissue combination support.

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  • 33. 

    A class I modification 0 of RPD normally are have many clasps?:

    • A.

      2 clasps

    • B.

      1 clasp

    • C.

      3 clasps

    • D.

      4 clasps

    Correct Answer
    A. 2 clasps
    Explanation
    A class I modification 0 of RPD normally has 2 clasps.

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  • 34. 

    Cleaning a removable partial denture in sodium hypochlorite may result in:

    • A.

      corrosion of the metal the framework

    • B.

      Increased caries activity

    • C.

      Increased periodontal problems

    • D.

      Whitening acrylic resin and artificial teeth

    Correct Answer
    A. corrosion of the metal the framework
    Explanation
    Cleaning a removable partial denture in sodium hypochlorite may result in corrosion of the metal framework. Sodium hypochlorite is a strong oxidizing agent that can react with the metal in the denture framework, leading to corrosion. This can weaken the structure of the denture and potentially cause it to break or become damaged. It is important to use appropriate cleaning solutions and techniques to avoid any harm to the denture.

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  • 35. 

    During biting a maxillary class I RPD with rotate around a line determined by the rigid metal above the survey line and closed to the extension areas This line is called:

    • A.

      Axis of rotation

    • B.

      Dual path line

    • C.

      Frankfurt line

    • D.

      Camper’s line

    Correct Answer
    A. Axis of rotation
    Explanation
    The correct answer is Axis of rotation. During biting, a maxillary class I RPD (removable partial denture) will rotate around a line that is determined by the rigid metal above the survey line and close to the extension areas. This line is known as the axis of rotation.

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  • 36. 

    Mandibular gridwork design of minor connectors:

    • A.

      extend 2/3 of the way from abutment tooth to retromolar pad

    • B.

      maximum bulk of the acrylic resin

    • C.

      prevents thin, edges fracturing

    • D.

      extend fully to the hamular notch

    Correct Answer
    A. extend 2/3 of the way from abutment tooth to retromolar pad
    Explanation
    The mandibular gridwork design of minor connectors should extend 2/3 of the way from the abutment tooth to the retromolar pad. This design allows for maximum bulk of the acrylic resin, which prevents thin edges from fracturing. It is not necessary for the connectors to extend fully to the hamular notch.

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  • 37. 

    The correct answer the basic movements of the mandible:

    • A.

      Hinge , lateral and translatory movement

    • B.

      Hinge, chewing and yawing

    • C.

      Translatory movements relative to centric relation

    • D.

      Lateral, dimension, excursion

    Correct Answer
    A. Hinge , lateral and translatory movement
    Explanation
    The correct answer is "Hinge, lateral and translatory movement." This answer accurately describes the basic movements of the mandible. The hinge movement refers to the opening and closing of the jaw, the lateral movement refers to side-to-side movements of the jaw, and the translatory movement refers to forward and backward movements of the jaw. These three movements are fundamental to the functioning of the mandible in activities such as chewing, speaking, and swallowing.

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  • 38. 

    A mandibular movement which is> would be best classified as a…………movement:

    • A.

      Hinge

    • B.

      Translatory excursion

    • C.

      Centric relation

    • D.

      Lateral

    Correct Answer
    A. Hinge
    Explanation
    A mandibular movement that is classified as a hinge movement refers to the opening and closing motion of the lower jaw around a fixed axis, similar to a door hinge. This movement primarily occurs in the temporomandibular joint (TMJ) and allows for basic functions such as chewing and speaking. It is characterized by a simple rotational motion without any lateral or sliding components.

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  • 39. 

    Protrusive or Retrusive movements can also be called………………movement:

    • A.

      Translatory or sliding

    • B.

      Translatory or vertical

    • C.

      Translatory or shifting

    • D.

      Sliding crossbite excursions

    Correct Answer
    A. Translatory or sliding
    Explanation
    Protrusive or retrusive movements refer to the forward or backward sliding of the mandible (lower jaw) in relation to the maxilla (upper jaw). Therefore, the correct answer is translatory or sliding, as both terms describe the same type of movement.

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  • 40. 

    When the survey line is height on the Mesial or Distal but low on the center, which one design clasp:

    • A.

      Y clasp

    • B.

      I clasp

    • C.

      T clasp

    • D.

      U clasp

    Correct Answer
    A. Y clasp
    Explanation
    When the survey line is high on the Mesial or Distal but low on the center, a Y clasp is designed. This is because the Y clasp allows for better retention and stability in cases where there is a height difference between the mesial/distal and center areas. The Y clasp can adapt to the irregularities of the teeth and provide effective support.

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  • 41. 

    More acceptable esthetically and less caries formation for bar clasp is:

    • A.

      I clasp

    • B.

      Y clasp

    • C.

      T clasp

    • D.

      U clasp

    Correct Answer
    A. I clasp
    Explanation
    The I clasp is more aesthetically acceptable and causes less caries formation compared to other types of clasps. This is because the I clasp is a lingual clasp, meaning it is placed on the inside of the teeth, making it less visible. Additionally, the I clasp exerts less force on the abutment teeth, reducing the risk of caries formation.

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  • 42. 

    Best selection of preventing abutments tooth of class I Kennedy from the negative effects of the additional load applied to them is by:

    • A.

      Keeping a light occlusion on the distal extensions

    • B.

      Splinting abutment with adjacent teeth

    • C.

      Placing distal rests on the distal abutment

    • D.

      Regular relining of distal extensions

    Correct Answer
    A. Keeping a light occlusion on the distal extensions
    Explanation
    Keeping a light occlusion on the distal extensions is the best selection for preventing abutment teeth of class I Kennedy from the negative effects of additional load. This means that the contact between the upper and lower teeth should be minimal or light on the distal extensions. This helps to distribute the load evenly and reduce the stress on the abutment teeth, preventing any damage or negative effects.

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  • 43. 

    When designing palatal connectors, relief should be given for:

    • A.

      Palatal torus

    • B.

      Ridge area

    • C.

      Elevated mid suture line

    • D.

      Rugae area

    Correct Answer
    A. Palatal torus
    Explanation
    When designing palatal connectors, relief should be given for the palatal torus. The palatal torus is a bony prominence that may be present on the midline of the palate. Providing relief for the palatal torus ensures that the denture or appliance fits comfortably and securely in the mouth. Without relief, the torus could cause discomfort or pressure points for the patient. Therefore, it is important to consider the presence of a palatal torus and provide appropriate relief when designing palatal connectors.

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  • 44. 

    For the preparation of rest seat:

    • A.

      Marginal ridge should be reduced by 1 mm

    • B.

      Marginal ridge should be reduced by 25 mm

    • C.

      The outline to have greater length than width

    • D.

      The outline to have greater width than length

    Correct Answer
    A. Marginal ridge should be reduced by 1 mm
    Explanation
    The correct answer is "Marginal ridge should be reduced by 1 mm." This means that when preparing the rest seat, the marginal ridge should be reduced in size by 1 mm. This reduction helps create a proper fit for the rest seat, ensuring stability and support for the restoration or prosthesis.

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  • 45. 

    Which of the following chronic conditions may cause tooth abrasion?:

    • A.

      Hard brush using and strong brushing

    • B.

      Pipe smoking

    • C.

      Occlusion trauma

    • D.

      Strong mastication

    Correct Answer
    A. Hard brush using and strong brushing
    Explanation
    Hard brush using and strong brushing can cause tooth abrasion because the excessive force and friction applied to the teeth can wear down the enamel over time. This can lead to the exposure of dentin, which is a softer layer of the tooth, making it more susceptible to damage and decay. It is important to use a soft-bristled toothbrush and practice gentle brushing techniques to prevent tooth abrasion.

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  • 46. 

    Tripod of dental surveyor is the method used:

    • A.

      Surveyor for recording the relation of the cast to the surveyor

    • B.

      For giving clasp assemblies at 3 points

    • C.

      Determine the undercut areas on the tooth

    • D.

      Surveyor to have reproducible position of the cast on the surveyor

    Correct Answer
    A. Surveyor for recording the relation of the cast to the surveyor
    Explanation
    The tripod of dental surveyor is used to record the relation of the cast to the surveyor. This means that it helps in accurately measuring and recording the position of the cast in relation to the surveyor. This is important for ensuring proper alignment and positioning of the dental prosthetics or appliances. The tripod allows for precise and reproducible positioning of the cast on the surveyor, which is crucial for achieving accurate and consistent results in dental procedures.

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  • 47. 

    What are the typical positions of the maxillary and mandibular teeth, and the tongue during empty mouth swallowing?:

    • A.

      Centric occlusion, the tongue touches the palate

    • B.

      Occlusion, the tongue touches the lingual aspects of the anterior teeth

    • C.

      Retruded contact, the tongue touches the palate

    • D.

      Retruded contact, the tongue touches the lingual aspects of the anterior teeth

    Correct Answer
    A. Centric occlusion, the tongue touches the palate
    Explanation
    During empty mouth swallowing, the typical position of the maxillary and mandibular teeth is in centric occlusion, which means that they are in their normal biting position. In this position, the tongue touches the palate, which helps in the swallowing process.

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  • 48. 

    Mesh type of grid work minor connectors is:

    • A.

      Potentially superior retention

    • B.

      Interferes with setting of teeth

    • C.

      Struts are too thick

    • D.

      Potentially more rigid

    Correct Answer
    A. Potentially superior retention
    Explanation
    The mesh type of grid work minor connectors potentially provide superior retention. This means that they have the ability to securely hold the prosthesis or restoration in place. This type of connector design allows for better stability and prevents the prosthesis from becoming loose or dislodged.

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  • 49. 

    Lattice type of grid work minor connectors is:

    • A.

      Potentially more rigid

    • B.

      Flatter

    • C.

      Less retention for acrylic resin

    • D.

      Potentially superior retention

    Correct Answer
    A. Potentially more rigid
    Explanation
    The lattice type of grid work minor connectors are potentially more rigid. This means that they have the ability to provide greater stability and support compared to other types of connectors. The rigidity of these connectors can help in maintaining the structural integrity of the grid work, making it more durable and resistant to deformation or movement.

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  • 50. 

    The kennedy classification of this RPD is:

    • A.

      Class I mod I

    • B.

      Class IV mod II

    • C.

      Class II mod I

    • D.

      Class I mod II

    Correct Answer
    A. Class I mod I
    Explanation
    The Kennedy classification of this RPD is Class I mod I because it has a bilateral edentulous area in the posterior region (Class I) and a unilateral edentulous area in the anterior region (mod I). This classification system is used to categorize partially edentulous arches based on the location and extent of the edentulous areas, helping in the design and selection of appropriate removable partial dentures.

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Quiz Review Timeline +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Jul 11, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Aug 23, 2019
    Quiz Created by
    Limhort2019
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