4dd MCQs 325 Orthodontics I Prof. Mey Phoung 2019
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Questions and Answers
- 1.
The conjunction of the fronto-nasal suture ?
- A.
Nasion
- B.
Frontal
- C.
Sella
- D.
Nasal
- E.
Basion
Correct Answer
A. NasionExplanation
The fronto-nasal suture is the junction between the frontal bone and the nasal bones. The term "nasion" refers to the point where the fronto-nasal suture meets the midline of the skull. It is an important landmark used in anthropological and anatomical studies to measure the position of the nasal bones and the overall shape of the skull. The other options, such as frontal, sella, and basion, are not directly related to the fronto-nasal suture.Rate this question:
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- 2.
What type of extra- oral traction when combined with fixed appliance treatment ?
- A.
Headgear
- B.
Mini- implant
- C.
Inter- traction
- D.
Intra- traction
- E.
All are related
Correct Answer
A. HeadgearExplanation
Headgear is a type of extra-oral traction that is often used in combination with fixed appliance treatment. It involves the use of a strap or harness that is attached to the patient's head and connected to the braces or appliances in their mouth. The purpose of headgear is to apply gentle pressure to the teeth and jaw, helping to correct alignment issues and guide the growth of the facial bones. This type of traction is commonly used in orthodontic treatment to address overbites and underbites.Rate this question:
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- 3.
High pull headgear was indicated in case of lower anterior facial height ?
- A.
Increase
- B.
Decrease
- C.
Normal
- D.
MMPA < 27 ± 3 deg
- E.
Unrelated
Correct Answer
A. IncreaseExplanation
High pull headgear is a treatment option used to correct certain orthodontic issues, such as a lower anterior facial height. This type of headgear applies force to the upper jaw, helping to stimulate its growth and development. By doing so, it can effectively increase the lower anterior facial height, bringing it into proper alignment with the rest of the face. Therefore, the correct answer is "Increase."Rate this question:
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- 4.
Function of active component to apply force to the teeth in order to move teeth known as ?
- A.
All are related
- B.
Springs
- C.
Screws
- D.
Labial bow ( active )
- E.
Elastics
Correct Answer
A. All are relatedExplanation
The correct answer is All are related. All of the options mentioned (springs, screws, labial bow, and elastics) are related to the function of applying force to the teeth in order to move them. Springs and screws are orthodontic appliances that exert force on the teeth. Labial bow is a type of wire that is used to apply force to the teeth. Elastics are also commonly used in orthodontic treatment to apply force and move the teeth. Therefore, all of these options are related to the function of applying force to move teeth.Rate this question:
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- 5.
Frankfort Horizontal is a reference plane constructed by joining which of the following landmarks?
- A.
Porion and Orbitale
- B.
Nasion and Sella
- C.
Porion and Sella
- D.
Porion and Nasion
- E.
Basion and Orbitale
Correct Answer
A. Porion and OrbitaleExplanation
The Frankfort Horizontal is a reference plane in craniofacial analysis that is constructed by joining the Porion (the highest point of the external auditory meatus) and the Orbitale (the lowest point on the lower margin of the eye socket). This plane is used to assess the position of the maxilla and mandible in relation to the skull.Rate this question:
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- 6.
The best time to correct a maxillary central incisor crossbite is ?
- A.
During erupting stage of central incisors erupt
- B.
After permanent canines erupt
- C.
After permanent central incisors erupt
- D.
After permanent lateral incisors erupt
- E.
Unrelated
Correct Answer
A. During erupting stage of central incisors eruptExplanation
During the erupting stage of central incisors, it is the best time to correct a maxillary central incisor crossbite. This is because during this stage, the teeth are still developing and can be guided into their proper positions more easily. Waiting until after the permanent canines, central incisors, or lateral incisors erupt may result in a more complex and difficult correction process. Therefore, it is ideal to address the crossbite issue during the erupting stage of the central incisors.Rate this question:
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- 7.
Which of the following conditions is usually present in a Class II, Division 2 malocclusion?
- A.
Lingual inclination of maxillary central incisors
- B.
Open bite
- C.
Steep mandibular plane
- D.
Mesiocclusion of permanent first molars
- E.
Unrelated
Correct Answer
A. Lingual inclination of maxillary central incisorsExplanation
A Class II, Division 2 malocclusion is characterized by the lingual inclination of the maxillary central incisors. This means that the upper front teeth tilt towards the tongue. This is typically seen in individuals with a deep overbite and a retruded lower jaw. The other options, such as open bite, steep mandibular plane, and mesiocclusion of permanent first molars, are not typically associated with Class II, Division 2 malocclusion.Rate this question:
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- 8.
The type of movement usually produced by a removable appliance is ?
- A.
Tipping
- B.
Torque
- C.
Rotation
- D.
Bodily movement
- E.
Un related
Correct Answer
A. TippingExplanation
A removable appliance usually produces a type of movement called tipping. Tipping refers to the movement of a tooth around its center of resistance, causing it to tilt or lean in a certain direction. This type of movement is commonly seen with removable appliances as they apply forces that are more likely to cause tipping rather than other types of movement such as torque, rotation, or bodily movement.Rate this question:
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- 9.
Anterior teeth are most likely to be fractured in children with which of the following mixed dentition malocclusions?
- A.
Class II Division 1
- B.
Class I
- C.
Class II DIvision 2
- D.
Class III
- E.
There is no relation
Correct Answer
A. Class II Division 1Explanation
In Class II Division 1 malocclusion, the upper front teeth (anterior teeth) are protruded or stick out in relation to the lower front teeth. This protrusion can make the anterior teeth more susceptible to fractures, especially in children who may engage in activities that increase the risk of trauma to the mouth, such as sports or rough play. Therefore, children with Class II Division 1 malocclusion are more likely to experience anterior teeth fractures compared to those with other mixed dentition malocclusions.Rate this question:
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- 10.
What factors that effect to relapse overbite correction after orthodontic treatment ?
- A.
All are related
- B.
No enough overbite
- C.
No occlusal stop
- D.
Growth of the mandible
- E.
Unrelated
Correct Answer
A. All are relatedExplanation
The correct answer is "All are related." This means that all of the factors mentioned in the options can contribute to relapse of overbite correction after orthodontic treatment. It suggests that factors such as having insufficient overbite correction, lack of occlusal stop, and the growth of the mandible can all play a role in the relapse of overbite. It implies that these factors are interconnected and should be considered together when assessing the likelihood of relapse.Rate this question:
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- 11.
The use of lateral Cephalometric radiograph in diagnosis for focusing on the skeletal pattern in dimension view ?
- A.
Antero-posterior
- B.
Transverse
- C.
In-out
- D.
All are related
- E.
Unrelated
Correct Answer
A. Antero-posteriorExplanation
The use of lateral Cephalometric radiograph in diagnosis focuses on the skeletal pattern in dimension view. Antero-posterior refers to the front-to-back dimension, which is essential for assessing the skeletal pattern and relationships between the upper and lower jaws. This view allows for the evaluation of the position and growth of the maxilla and mandible, as well as the relationship of the teeth to the jaws. Therefore, antero-posterior is the correct answer as it accurately describes the use of lateral Cephalometric radiograph in diagnosing skeletal patterns.Rate this question:
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- 12.
What diagnosis will be found when the lateral cephalometric tracing was finished ?
- A.
All are related
- B.
Skeletal pattern
- C.
Dental base length
- D.
Soft tissue
- E.
Dental factors
Correct Answer
A. All are relatedExplanation
The correct answer is "All are related." This suggests that the diagnosis found when the lateral cephalometric tracing was finished will involve all of the mentioned factors: skeletal pattern, dental base length, soft tissue, and dental factors. It implies that these factors are interconnected and contribute to the overall diagnosis.Rate this question:
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- 13.
The anterior point of the fronto-nasal suture is ?
- A.
N Point
- B.
A Point
- C.
B Point
- D.
S Point
- E.
All unrelated
Correct Answer
A. N PointExplanation
The anterior point of the fronto-nasal suture is referred to as the N Point. The fronto-nasal suture is the junction between the frontal bone and the nasal bones. The N Point is an important landmark in orthodontics and craniofacial surgery as it is used to measure and analyze the position and growth of the maxilla (upper jaw) in relation to the skull.Rate this question:
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- 14.
The deepest point on the concavity of the mandibular profile between the point of chin and the alveolar crest is ?
- A.
B Point
- B.
A Point
- C.
N Point
- D.
S Point
- E.
All unrelated
Correct Answer
A. B PointExplanation
The correct answer is B Point. The B Point is the deepest point on the concavity of the mandibular profile between the point of chin and the alveolar crest. This point is important in orthodontics and orthognathic surgery as it helps determine the position of the lower jaw.Rate this question:
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- 15.
The deepest point on the maxillary profile between anterior nasal spine and the alveolar crest is ?
- A.
A Point
- B.
B Point
- C.
Ba Point
- D.
S Point
- E.
All unrelated
Correct Answer
A. A PointExplanation
The correct answer is A Point. The maxillary profile refers to the outline or contour of the upper jaw. The deepest point on this profile, between the anterior nasal spine (a bony projection at the front of the maxilla) and the alveolar crest (the highest point of the gum ridge), is known as the A Point. This is an anatomical reference point used in orthodontics and maxillofacial surgery to assess and plan treatments for facial asymmetry and malocclusion.Rate this question:
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- 16.
The most posterior, inferior point on the angle of the mandible ?
- A.
Go Point
- B.
B Point
- C.
Po Point
- D.
Ba Point
- E.
All unrelated
Correct Answer
A. Go PointExplanation
The most posterior, inferior point on the angle of the mandible is known as the Go Point. This point is located at the junction of the posterior border of the ramus and the inferior border of the mandible. It is an anatomical landmark that is commonly used in dental and orthodontic treatments for reference and measurements.Rate this question:
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- 17.
The lowermost point on the mandibular symphysis ?
- A.
Me Point
- B.
B Point
- C.
Po Point
- D.
Pog Point
- E.
All unrelated
Correct Answer
A. Me PointExplanation
The correct answer is "Me Point." The Me Point refers to the most anterior and inferior point on the mandibular symphysis. It is an important landmark in dentistry and orthodontics for measuring and analyzing dental and facial proportions.Rate this question:
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- 18.
The maxillary plane ( Mx ) was represented by a line drawn through from ?
- A.
ANS and PNS
- B.
ANS and Po
- C.
PNS and Or
- D.
PNS and Go
- E.
All unrelated
Correct Answer
A. ANS and PNSExplanation
The maxillary plane is represented by a line drawn through the ANS (anterior nasal spine) and the PNS (posterior nasal spine). These two points are anatomical landmarks that help define the position and orientation of the maxilla, which is the upper jawbone. By drawing a line through the ANS and PNS, we can visualize the orientation of the maxillary plane in relation to other structures in the skull. The other options, such as ANS and Po, PNS and Or, and PNS and Go, are unrelated to the representation of the maxillary plane.Rate this question:
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- 19.
The Mandibular plane ( Mn ) was represented by a line drawn through from ?
- A.
Me and Go
- B.
Me and Pog
- C.
Me and Po
- D.
Me and Ba
- E.
All unrelated
Correct Answer
A. Me and GoExplanation
The Mandibular plane (Mn) is represented by a line drawn through the points Me (Menton) and Go (Gonion). These two points are anatomical landmarks on the lower jaw. Me represents the most anterior point on the chin, while Go represents the most posterior point on the angle of the mandible. Drawing a line through these two points helps to determine the orientation and position of the mandible in relation to the skull. The other options mentioned (Me and Pog, Me and Po, Me and Ba) are unrelated and do not represent the Mandibular plane.Rate this question:
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- 20.
The most inferior point on the marginal of the orbit ?
- A.
Or Point
- B.
A Point
- C.
B Point
- D.
Po Point
- E.
All unrelated
Correct Answer
A. Or PointExplanation
The most inferior point on the margin of the orbit is referred to as the "Or Point." This point is located at the lowest position on the orbital margin, indicating its inferiority compared to the other points mentioned. The other options, such as A Point, B Point, and Po Point, are unrelated and do not represent the most inferior point on the orbital margin.Rate this question:
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- 21.
The highest point on the bony external auditory meatus ?
- A.
Po Point
- B.
Or Point
- C.
Ba Point
- D.
S Point
- E.
All unrelated
Correct Answer
A. Po PointExplanation
The correct answer is "Po Point." The bony external auditory meatus is a part of the ear canal. The Po Point refers to the posterior superior point of the bony external auditory meatus, which is the highest point of this structure.Rate this question:
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- 22.
The Franfort plane ( FP ) was represented by a line connecting from ?
- A.
Po and Or
- B.
Po and ANS
- C.
Po and Nasion
- D.
Po and Pog
- E.
Unrelated
Correct Answer
A. Po and OrExplanation
The Franfort plane (FP) is a reference line used in cephalometric analysis to measure the position and orientation of the skull. It is defined by a line connecting two anatomical landmarks: Po (porion) and Or (orbitale). Porion is the highest point of the external auditory meatus, while orbitale is the lowest point on the lower rim of the eye socket. Therefore, the correct answer is Po and Or.Rate this question:
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- 23.
The most anterior point of the bony chin ?
- A.
Pog Point
- B.
Me Point
- C.
B Point
- D.
Ii Point
- E.
All unrelated
Correct Answer
A. Pog PointExplanation
The Pog Point is the most anterior point of the bony chin. It is a reference point used in orthodontics and craniofacial analysis to measure and analyze the position of the chin and its relationship to other facial structures.Rate this question:
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- 24.
Functional occlusal plane ( FOP ) was represented by a line that passes through the occlusion of the ?
- A.
Mesial cusps of the most anterior permanent molar and halfway between the tips of the upper and lower central incisors
- B.
Mesial cusps of the permanent molar and halfway between the tips of the upper and lower central incisors.
- C.
Distal cusps of the most anterior permanent molar and halfway between the tips of the upper and lower central incisors.
- D.
Distal cusps of the permanent molar and halfway between the tips of the upper and lower central incisors.
- E.
All unrelated
Correct Answer
A. Mesial cusps of the most anterior permanent molar and halfway between the tips of the upper and lower central incisorsExplanation
The functional occlusal plane (FOP) is a line that represents the ideal occlusion of the teeth during functional movements such as chewing and speaking. It is important for dental professionals to understand and consider the FOP when planning and performing dental treatments. The correct answer states that the FOP is represented by a line that passes through the mesial cusps of the most anterior permanent molar and halfway between the tips of the upper and lower central incisors. This means that the FOP should align with these specific landmarks in order to achieve proper occlusion.Rate this question:
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- 25.
The upper anterior facial height is a line that is perpendicular to ?
- A.
The Maxillary plane from the N Point
- B.
The Maxillary plane from the S Point
- C.
The Maxillary plane from the frontal bone
- D.
The Maxillary plane from the nasal bone
- E.
All unrelated
Correct Answer
A. The Maxillary plane from the N PointExplanation
The upper anterior facial height is a line that is perpendicular to the Maxillary plane from the N Point. This means that the line measuring the upper anterior facial height is drawn at a 90-degree angle to the Maxillary plane, specifically from the N Point. This is the correct answer because it accurately describes the relationship between the upper anterior facial height and the Maxillary plane from the N Point.Rate this question:
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- 26.
The lower anterior facial height is a line that is perpendicular to ?
- A.
The Maxillary plane from the Me Point
- B.
The Maxillary plane from the B Point
- C.
The Maxillary plane from the Pog Point
- D.
The Maxillary plane from the chin
- E.
All unrelated
Correct Answer
A. The Maxillary plane from the Me PointExplanation
The lower anterior facial height is a line that is perpendicular to the Maxillary plane from the Me Point.Rate this question:
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- 27.
The location of the Basion ( Ba Point ) was known as ?
- A.
All unrelate
- B.
The most inferior point of the Porion
- C.
In the middle point of the sella turcica
- D.
Nearest the zygomatic bone
- E.
The most superior of the condylar head
Correct Answer
A. All unrelate -
- 28.
In the cranial base & cranium landmark there are the main five points as below: ?
- A.
Sella, Nasion, Porion, Basion and Orbitale
- B.
Sella, Nasion, Porion, ANS and PNS
- C.
Sella, Nasion, Porion, Pogonion and Orbitale
- D.
Sella, Nasion, Porion, Basion and Menton
- E.
Unrelated
Correct Answer
A. Sella, Nasion, Porion, Basion and OrbitaleExplanation
The correct answer is Sella, Nasion, Porion, Basion, and Orbitale. These five points are commonly used as landmarks in cranial base and cranium measurements. The Sella point is located at the center of the sella turcica, a bony structure in the skull. The Nasion point is the midpoint between the forehead and the bridge of the nose. The Porion point is the highest point on the external auditory meatus. The Basion point is the most anterior-inferior point on the foramen magnum. The Orbitale point is the lowest point on the inferior rim of the eye socket. Together, these landmarks are used to assess craniofacial morphology and growth.Rate this question:
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- 29.
The mandibular landmark were known as below: ?
- A.
Pogonion, Menton, Gonion, Point B, Ii
- B.
Pogonion, Menton, Porion, Point B, Ii
- C.
Pogonion, Nasion, Gonion, Point B, Ii
- D.
Pogonion, Basion, Gonion, Point B, Ii
- E.
All unrelated
Correct Answer
A. Pogonion, Menton, Gonion, Point B, IiExplanation
The correct answer is Pogonion, Menton, Gonion, Point B, Ii. These are all mandibular landmarks that are commonly used in orthodontics and craniofacial analysis. Pogonion refers to the most anterior point on the chin, Menton is the most inferior point of the mandible, Gonion is the angle formed by the junction of the posterior border of the mandible, Point B is a reference point on the mandible used in cephalometric analysis, and Ii is the incisal edge of the mandibular central incisor.Rate this question:
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- 30.
The factor effect to the choice for teeth extraction when the space is required as follows ?
- A.
Teeth are poor prognosis
- B.
Teeth are well alignment with spacing
- C.
Anchorage requirements is enough
- D.
Teeth are well alignment without spacing
- E.
All are related
Correct Answer
A. Teeth are poor prognosisExplanation
Teeth with poor prognosis refer to teeth that have a low chance of successful treatment or long-term survival. When space is required, extracting teeth with poor prognosis may be a suitable choice because these teeth are unlikely to provide long-term benefits and may even cause further dental issues. Therefore, the factor of poor prognosis influences the decision to extract teeth when space is needed.Rate this question:
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- 31.
Definition of class I incisor relationship that lower incisor edge occlude to ?
- A.
Directly to cingulum ptateau of the upper incisor
- B.
Posteriorly of cingulum ptateau of the upper incisor.
- C.
Anteriorly of cingulum ptateau of the upper incisor.
- D.
Unrelated.
- E.
All are related.
Correct Answer
A. Directly to cingulum ptateau of the upper incisorExplanation
In a class I incisor relationship, the lower incisor edge occludes directly to the cingulum plateau of the upper incisor. This means that the lower incisor edge aligns and makes contact with the rounded area on the lingual surface of the upper incisor, known as the cingulum plateau. This type of occlusion is considered normal and ideal, as it allows for proper alignment and function of the incisors during biting and chewing.Rate this question:
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- 32.
The trauma to the tooth when the heavy force to supply ?
- A.
Root resorption
- B.
Crown fracture
- C.
Root fracture
- D.
Tooth lost
- E.
All are related
Correct Answer
A. Root resorptionExplanation
Root resorption refers to the breakdown or destruction of the root structure of a tooth. It can occur due to various reasons, including trauma to the tooth caused by heavy force. When a tooth experiences a significant impact or force, it can lead to damage to the root structure, resulting in root resorption. Therefore, root resorption is a possible outcome when the tooth undergoes trauma due to heavy force.Rate this question:
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- 33.
The convexity of the face with profile view when the ?
- A.
Skeletal is class II base
- B.
Skeletal is class III base
- C.
Skeletal is class I base
- D.
Skeletal discrepancy
- E.
Unrelated
Correct Answer
A. Skeletal is class II baseExplanation
The correct answer is "Skeletal is class II base". This means that when the skeletal base of the face is classified as class II, it can result in convexity of the face when viewed in profile. Class II skeletal base refers to a condition where the upper jaw (maxilla) is positioned further back in relation to the lower jaw (mandible), causing the face to appear more convex or protruded.Rate this question:
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- 34.
The concavity of the face with profile view when the ?
- A.
Skeletal is class III base
- B.
Skeletal is class II base
- C.
Skeletal is class I base
- D.
Skeletal discrepancy
- E.
Unrelated
Correct Answer
A. Skeletal is class III baseExplanation
The correct answer is "Skeletal is class III base." This means that the skeletal structure of the face is positioned in such a way that the lower jaw is protruding forward in relation to the upper jaw. This can result in a concave appearance when viewed in profile.Rate this question:
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- 35.
The premature contact when the teeth bite by ?
- A.
The edge to edge
- B.
Posteriorly
- C.
Maximum inter-cuspation
- D.
Anteriorly
- E.
Unrelated
Correct Answer
A. The edge to edgeExplanation
The correct answer is "The edge to edge." This refers to a type of bite where the front teeth meet each other in a horizontal position, causing the edges of the teeth to touch. This can occur due to various reasons such as misalignment of the teeth or jaw problems.Rate this question:
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- 36.
Case selection for removable appliance when skeletal pattern as below ?
- A.
All are related
- B.
2˚≤ ANB ≤4˚
- C.
4˚˂ ANB ˂6˚
- D.
0˚≤ ANB ≤1˚
- E.
All unrelated
Correct Answer
A. All are relatedExplanation
The correct answer is "All are related". This means that the skeletal pattern, as described by the ANB angle, is related to the case selection for removable appliances. The ANB angle is a measurement used in orthodontics to assess the relationship between the upper and lower jaws. In this case, the range of ANB angles specified (2˚≤ ANB ≤4˚, 4˚˂ ANB ˂6˚, 0˚≤ ANB ≤1˚) suggests that the case selection for removable appliances is influenced by the specific ANB angle values falling within these ranges.Rate this question:
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- 37.
Tooth movement for removable appliance need ?
- A.
Tipping movement
- B.
Bodily movement
- C.
Uprighting movement
- D.
All are related
- E.
All unrelated
Correct Answer
A. Tipping movementExplanation
The correct answer is "Tipping movement." Tipping movement refers to the tilting or tipping of a tooth in a certain direction. In the case of a removable appliance, such as a retainer or a clear aligner, the force applied to the tooth is not distributed evenly, resulting in a tipping movement. This type of movement is commonly used to correct mild to moderate tooth misalignment.Rate this question:
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- 38.
Which degree of rotation in tooth movement when the URA is indicated ?
- A.
The tooth that has less than 45º rotation
- B.
The tooth that has 45º rotation
- C.
The tooth that has more than 45º rotation
- D.
All are related
- E.
All unrelated
Correct Answer
A. The tooth that has less than 45º rotationExplanation
The correct answer is "The tooth that has less than 45º rotation." This means that when the URA (Unknown Rotation Angle) is indicated, it refers to the tooth that has a rotation angle of less than 45 degrees.Rate this question:
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- 39.
Which teeth apexes are suitable for removable appliance ?
- A.
The apexes are not diplaced
- B.
The teeth apexes are displaced
- C.
The apexes are resorbed
- D.
All are related
- E.
All unrelated
Correct Answer
A. The apexes are not diplacedExplanation
The correct answer is "The apexes are not displaced." This means that the teeth apexes are in their proper position and not shifted or moved. This is important for a removable appliance as it needs a stable foundation to properly fit and function. If the apexes were displaced, it could cause discomfort or instability in the appliance.Rate this question:
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- 40.
Which case for removable appliance should be indicated when ?
- A.
Posterior crossbite with mandibular displacement
- B.
Posterior crossbite without mandibular displacement
- C.
Bilateral buccal crossbite
- D.
All are related
- E.
All unrelated
Correct Answer
A. Posterior crossbite with mandibular displacementExplanation
The correct answer is "Posterior crossbite with mandibular displacement". This case indicates the need for a removable appliance because a posterior crossbite refers to a malocclusion where the upper teeth are positioned inside the lower teeth when biting down. Additionally, mandibular displacement refers to the lower jaw being shifted to one side. A removable appliance can help correct both the posterior crossbite and mandibular displacement by realigning the teeth and jaw to their proper positions.Rate this question:
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- 41.
Contra- indication for removable appliance when ?
- A.
All are related
- B.
Teeth need bodily movement
- C.
Very deep overbite
- D.
Severe imbalance skeletal pattern
- E.
All unrelated
Correct Answer
A. All are relatedExplanation
The correct answer is "All are related." This means that all of the given conditions (teeth needing bodily movement, very deep overbite, severe imbalance skeletal pattern) are contraindications for removable appliances. In other words, if any of these conditions are present, it is not recommended to use a removable appliance for treatment.Rate this question:
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- 42.
The components for removable appliances ?
- A.
All are related
- B.
Active components
- C.
Retentive components
- D.
Anchorage
- E.
Baseplate
Correct Answer
A. All are relatedExplanation
The components for removable appliances, including active components, retentive components, anchorage, and baseplate, are all related to each other. Each component serves a specific purpose in the function and effectiveness of the removable appliance. Active components are used to apply forces to the teeth or jaws, retentive components help to hold the appliance in place, anchorage provides stability and support, and the baseplate serves as the foundation for the appliance. Together, these components work in harmony to achieve the desired outcome of the removable appliance.Rate this question:
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- 43.
What is the function for active components ?
- A.
To apply force to the teeth in order to move teeth
- B.
To prevent the teeth move in any places
- C.
To keep in position all the teeth
- D.
All are related
- E.
All unrelated
Correct Answer
A. To apply force to the teeth in order to move teethExplanation
The function of active components is to apply force to the teeth in order to move them. Active components, such as braces or aligners, exert pressure on the teeth to gradually shift them into the desired position. This helps in correcting misalignment or malocclusion.Rate this question:
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- 44.
Types of active components ?
- A.
Springs
- B.
Adams clasp
- C.
Southend clasp
- D.
Clasp
- E.
All are related
Correct Answer
A. SpringsExplanation
Springs are a type of active component used in various mechanical and electrical systems. They are designed to store and release mechanical energy, making them suitable for applications such as shock absorption, suspension systems, and electrical contacts. Springs can be found in a wide range of devices, including watches, cars, and industrial machinery. They are an essential component in many systems, providing flexibility and resilience to ensure proper functioning.Rate this question:
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- 45.
What types of springs for removable appliances ?
- A.
All are related
- B.
Z spring
- C.
Buccal canine retractor
- D.
T spring
- E.
All unrelated
Correct Answer
A. All are relatedExplanation
The correct answer is "All are related." This means that all the mentioned types of springs (Z spring, Buccal canine retractor, and T spring) are connected or associated in some way. It implies that they have similarities or are used for similar purposes in the context of removable appliances.Rate this question:
-
- 46.
Which size of wire for palatal finger spring ?
- A.
0.5 mm
- B.
0.7 mm
- C.
0.9 mm
- D.
1.0 mm
- E.
All unrelated
Correct Answer
A. 0.5 mmExplanation
A palatal finger spring is a type of orthodontic appliance used to correct certain dental issues. The size of wire used for the palatal finger spring is important as it determines the amount of force applied to the teeth. In this case, the correct answer is 0.5 mm, which suggests that a wire of this size is suitable for the palatal finger spring.Rate this question:
-
- 47.
Which size of wire for buccal canine retractor ?
- A.
0.7 mm
- B.
0.6 mm
- C.
0.8 mm
- D.
0.9 mm
- E.
All unrelated
Correct Answer
A. 0.7 mmExplanation
The correct answer is 0.7 mm. This size of wire is suitable for a buccal canine retractor. It is likely the most appropriate size based on the context of the question, which is asking for the wire size specifically for a buccal canine retractor.Rate this question:
-
- 48.
Which size of wire for Z spring ?
- A.
0.5 mm
- B.
0.7 mm
- C.
0.9 mm
- D.
All are related
- E.
All unrelated
Correct Answer
A. 0.5 mmExplanation
The correct answer is 0.5 mm because it is the specific size of wire recommended for Z spring. The other options, 0.7 mm and 0.9 mm, are not the appropriate sizes for the Z spring. Additionally, the options "All are related" and "All unrelated" do not provide any specific information about the size of wire for Z spring.Rate this question:
-
- 49.
Which size of wire for T spring ?
- A.
0.5 mm
- B.
0.9 mm
- C.
0.7 mm
- D.
0.3 mm
- E.
All unrelated
Correct Answer
A. 0.5 mmExplanation
The correct answer for the size of wire for T spring is 0.5 mm.Rate this question:
-
- 50.
What function for palatal finger spring ?
- A.
To move a tooth to mesially or distally
- B.
To move a tooth to buccally
- C.
To move a tooth to palatally
- D.
To move a tooth to buccally or palatally
- E.
All unrelated
Correct Answer
A. To move a tooth to mesially or distallyExplanation
The function of a palatal finger spring is to move a tooth either mesially or distally.Rate this question:
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Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.
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Current Version
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Apr 15, 2024Quiz Edited by
ProProfs Editorial Team -
Mar 20, 2019Quiz Created by
Catherine Halcomb
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