Dental Practice Questions

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1. The most important in RCT is to seal

Explanation

In root canal treatment (RCT), the most crucial area to seal is the apical 1/3. This refers to the bottom third of the root canal, near the apex of the tooth. Properly sealing this area is essential to prevent any bacteria or debris from entering the canal and causing infection or further damage. Focusing on sealing the apical 1/3 ensures the success of the RCT by creating a barrier against potential complications.

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About This Quiz
Dental Practice Questions - Quiz

Dental Practice Questions assess key concepts in dentistry, focusing on amalgam procedures, nerve supplies, restorative problems, cementum characteristics, and denture impacts. It is designed for dental professionals to test their knowledge and application in clinical scenarios.

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2. The functions of periodontal ligament include

Explanation

The periodontal ligament has multiple functions. It is responsible for the formation and maintenance of the periodontal tissues, which support the teeth. This is known as the formative function. Additionally, the ligament provides mechanical support to the teeth, allowing for their movement during chewing and other activities. This is the mechanical function. Lastly, the periodontal ligament contains sensory nerve endings, which provide feedback to the brain about the position and pressure on the teeth. This is the sensory function. Therefore, all of the above functions are performed by the periodontal ligament.

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3. Radiotherapy increase caries by decreasing salivary secretion

Explanation

Radiotherapy can indeed increase the risk of developing caries (tooth decay) by decreasing salivary secretion. Saliva plays a crucial role in maintaining oral health by neutralizing acids, remineralizing teeth, and washing away food particles. However, radiotherapy can damage the salivary glands, leading to reduced saliva production. This decrease in salivary flow can result in a dry mouth, which creates an environment conducive to the growth of harmful bacteria and the development of caries. Therefore, the statement is true.

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4. An 18 year old patient comes complaining of pain, bad breath and bleeding gingival.  This began over the weekend while studying for final examination.  The patient may have which of the following conditions

Explanation

Based on the symptoms described (pain, bad breath, bleeding gingival) and the context provided (began over the weekend while studying for final examination), the most likely condition the patient may have is Acute necrotizing ulcerative gingivitis. This condition, also known as "trench mouth," is characterized by painful, bleeding gums, bad breath, and the presence of ulcers or necrotic tissue in the mouth. It is often associated with stress and poor oral hygiene, which could be exacerbated by the patient's intense studying for exams.

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5. Patient on treatment with steroids are placed on antibiotics after oral surgical procedures because:

Explanation

Patients on treatment with steroids are placed on antibiotics after oral surgical procedures because steroids can suppress the immune system, making the patient more susceptible to infections. Antibiotics help prevent or treat any potential infections that may arise due to the weakened immune response. This is particularly important after oral surgical procedures, as the mouth is a common site for bacterial colonization and infections.

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6. Pulp chamber is lower 1st molar is mesially located

Explanation

The statement "Pulp chamber is lower 1st molar is mesially located" is true. In the lower first molar, the pulp chamber is indeed mesially located. The pulp chamber is the central space within the tooth that contains the pulp, which consists of nerves, blood vessels, and connective tissue. In the lower first molar, this pulp chamber is situated towards the mesial (front) aspect of the tooth. This anatomical arrangement is characteristic of the lower first molar and helps in understanding its internal structure.

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7. Artificial teeth best to be selected by

Explanation

The correct answer is preextraction cord. Preextraction cord is used to displace the gingival tissue away from the tooth before extraction, allowing for accurate impressions and selection of artificial teeth. This helps in achieving a better fit and aesthetic outcome for the patient. Postextraction cord, on the other hand, is used after extraction to control bleeding and promote healing.

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8. Dentin composition

Explanation

The dentin composition is primarily made up of inorganic materials, which accounts for about 60-65% of its weight. In terms of volume, the inorganic content makes up around 70% of the dentin. This indicates that the dentin is predominantly composed of mineralized substances such as hydroxyapatite crystals. The remaining composition includes water, which accounts for about 25% of the weight and 12% of the volume, as well as organic materials, which make up approximately 43% of the weight and 20% of the volume.

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9. Handicapped pt with lesion in central nervous system appears to have different type of disorders in movement and posture:

Explanation

Cerebral palsy is a neurological disorder caused by damage to the brain during development. It affects movement and posture, leading to difficulties in controlling muscles. This aligns with the description of the handicapped patient with a lesion in the central nervous system having different types of movement and posture disorders. Seizures and learning disabilities are not specifically mentioned in the given information, making cerebral palsy the most appropriate answer.

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10. For a MORE rigid structure, a base-metal partial denture alloy should be selected rather than a Type IV gold because the alloy has a

Explanation

A higher modulus of elasticity means that the material is stiffer and less flexible. In the context of a partial denture, a more rigid structure is desired to provide better support and stability. Therefore, selecting a base-metal partial denture alloy with a higher modulus of elasticity would be more suitable than a Type IV gold alloy, which would be more flexible.

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11. Best pontic is

Explanation

The best pontic is hygienic because hygiene is an important factor in dental care. A hygienic pontic would be easy to clean and maintain, reducing the risk of plaque buildup and bacterial growth. This would help prevent infections and promote oral health. A hygienic pontic would also be beneficial for the overall well-being of the patient, as it would contribute to a clean and healthy oral environment.

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12. The most common benign tumor in oral cavity is

Explanation

Fibroma is the most common benign tumor in the oral cavity. It is a slow-growing, painless, and non-cancerous tumor that typically arises from the connective tissue. Fibromas are usually firm, smooth, and can have a similar color to the surrounding oral tissues. They commonly occur on the gums, tongue, or inside the cheeks. Fibromas are often caused by chronic irritation or trauma, such as biting the cheek or using tobacco products. While fibromas are generally harmless, they may require removal if they cause discomfort or interfere with oral functions.

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13. Cavity varnish should be applies at least in

Explanation

Cavity varnish should be applied in at least two layers. Applying varnish in multiple layers ensures better coverage and protection for the tooth surface. The first layer acts as a base, sealing the tooth and providing a smooth surface for the subsequent layers. The second layer adds an extra protective barrier, enhancing the longevity of the varnish. Applying varnish in two layers also allows for better adherence to the tooth structure, reducing the risk of premature wear or detachment.

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14. Composite for posterior teeth

Explanation

The correct answer is hybrid + rough filler. Hybrid composite is a type of composite material that combines the properties of microfilled and macrofilled composites. It has both small particles for a smooth finish and larger particles for strength and durability. The rough filler in the hybrid composite provides better mechanical properties and wear resistance, making it suitable for use in posterior teeth which experience higher chewing forces.

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15. Three weeks after delivery of a unilateral distance extension mandibular removable partial denture, a patient complains of a sensitive abutment tooth.  Clinical examination reveals sensitivity to percussion of the tooth.  The most likely cause is :

Explanation

P 14

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16. Nerve impulse stops when injecting local anesthesia

Explanation

When injecting local anesthesia, it blocks the transmission of nerve impulses in the area where it is administered. This is achieved by temporarily inhibiting the function of nerve fibers, specifically the ones responsible for transmitting pain signals. As a result, the nerve impulse, which is an electrical signal that travels along the nerve fibers, is halted or stopped. Therefore, the statement that the nerve impulse stops when injecting local anesthesia is true.

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17. Periodontal ligament fibers in the middle third of the root is

Explanation

The correct answer is oblique because periodontal ligament fibers in the middle third of the root are arranged in an oblique manner. This arrangement helps to provide support and stability to the tooth by connecting it to the surrounding bone. The oblique orientation of the fibers allows for some flexibility and shock absorption during chewing and biting forces, preventing excessive stress on the tooth.

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18. Most of dentin bonding material need conditioning time of

Explanation

Dentin bonding materials are used in dentistry to bond restorative materials to the natural tooth structure. These materials typically require conditioning time, which is the amount of time the material needs to be in contact with the tooth surface to ensure proper bonding. The correct answer of 15 seconds suggests that most dentin bonding materials only require a short conditioning time of 15 seconds. This indicates that these materials are efficient and can quickly bond to the tooth surface, saving time during dental procedures.

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19. Chemicomechanical loss of tooth tissue is termed as

Explanation

Erosion is the correct answer because it refers to the chemicomechanical loss of tooth tissue. This process occurs when acids, such as those found in certain foods and drinks, wear away the enamel on the teeth. Erosion can also be caused by stomach acid from conditions like acid reflux or bulimia. It is different from abrasion, which is the mechanical wearing away of tooth tissue, attrition, which is the natural wearing down of teeth from normal use, and decalcification, which is the loss of minerals from the tooth enamel.

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20. In an occlusal cavity prepared for amalgam, facial and lingual walls which slightly converge occlusally ( 5 degrees per wall) would NOT create weak enamel margins because

Explanation

The correct answer is that enamel rods forming the margins would still be full length and supported on dentin. This is because even though the facial and lingual walls slightly converge occlusally, the enamel rods would still be intact and supported by the underlying dentin. This ensures that the enamel margins remain strong and stable, preventing any weakness or vulnerability in the restoration.

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21. Compomer has same flouride as GI

Explanation

The statement is false because compomer and GI (glass ionomer) do not have the same fluoride content. Compomer is a type of dental material that is a combination of composite resin and glass ionomer, while GI is a dental material that contains fluoride. Therefore, the fluoride content in GI is higher than in compomer.

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22. Light curing time for simple shallow class III composite

Explanation

The correct answer is 20 sec. This is the recommended light curing time for a simple shallow class III composite. Curing time refers to the amount of time that the dental composite material needs to be exposed to the curing light in order to harden properly. In this case, a curing time of 20 seconds is sufficient to ensure that the composite material is fully cured and has achieved the desired strength and stability.

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23. Splinting of several teeth together as abutments for a fixed prosthesis is done to

Explanation

Splinting of several teeth together as abutments for a fixed prosthesis is done to distribute occlusal load. This means that by splinting multiple teeth together, the force of biting and chewing is spread across a larger area, reducing the stress on individual teeth. This can help prevent excessive force on any one tooth, which can lead to damage or failure of the prosthesis. By distributing the occlusal load, the splinting also helps to improve the longevity and stability of the prosthesis.

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24. A 7 yr old boy has an exquisitely painful mouth for a period of 4 days.  Three days prior to the onset of the local symptoms, he had palpable, tender, submandibular lymph nodes and a temp of  101.2F.  Oral exam reveals a generalized infammation of the attached gingiva & alveolar mucosa.  Loose white debris covers the free gingival margins and fills the interproximal embrasures. Discrete areas of ulceration within rings of intense inflammation are noted on the buccal mucosa and the palate. Theinterdental papillae are intact.  The dalivary flow is heavy and viscous.   There are no lesions on the extremiies. 

The condition described is

Explanation

The description of the patient's symptoms, including painful mouth, palpable submandibular lymph nodes, fever, inflammation of the gingiva and alveolar mucosa, white debris on the gingival margins, ulceration within rings of intense inflammation, intact interdental papillae, heavy and viscous salivary flow, and absence of lesions on the extremities, is consistent with acute herpetic gingivostomatitis.

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25. The lifting of a mandibular partial deture with distal extension bases may be corrected by

Explanation

The correct answer is reducing overextended borders. When a mandibular partial denture with distal extension bases is lifted, it means that the denture is not fitting properly and is causing discomfort or instability. One possible cause for this issue is overextended borders, which means that the borders of the denture extend beyond the natural contours of the oral tissues. By reducing these overextended borders, the denture can be adjusted to fit more accurately and comfortably in the mouth, correcting the lifting issue. Narrowing the teeth, tightening the brace arms, or tightening the retention arms would not directly address the problem of overextended borders.

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26. It has been proven that amalgam restoration has the following characteristics. 
1. Micro leakage decrease with aging of the amalgam restoration
2. it is the least techniques sensitive of all current direct  restorations
3. High dimensional changes

Explanation

Amalgam restoration has been proven to have the characteristics of decreased micro leakage with aging and being the least technique sensitive of all current direct restorations. This means that over time, the risk of leakage around the restoration decreases, and it is less likely to be affected by variations in technique during placement. Therefore, the correct answer is 1 & 2.

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27. Root canal therapy was completed on tooth #14 and the crown was restored with a gold onaly 2 weeks ago.  The pt is now complaining that the tooth feels long and hurts when he bites.  He cannot chew on that side. 

Evaluation of the circumstances should begin with:

Explanation

288

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28. Orthognathic ridge relationship (class II ) present several problems, which should be taken into consideration when constructing a complete denture prosthesis.  These include all EXCEPT:

Explanation

Orthognathic ridge relationship (class II) refers to a specific type of jaw relationship where the upper jaw is positioned further forward than the lower jaw. This can present several challenges when constructing a complete denture prosthesis. One of these challenges is the requirement of a minimum interocclusal distance, which means that there needs to be a certain amount of space between the upper and lower teeth when the jaws are in a resting position. This is not a problem associated with class II ridge relationships, as they typically have a greater range of jaw movement in function. Therefore, the correct answer is that class II ridge relationships do not require a minimum interocclusal distance.

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29. Diagnosis of early necrotizing ulcerative gingivitis is BEST made on the basis of

Explanation

The diagnosis of early necrotizing ulcerative gingivitis is best made on the basis of ulceration of the interdental papilla. This is because early necrotizing ulcerative gingivitis is characterized by the presence of painful ulcers in the interdental papilla, which are the triangular gum tissues between the teeth. Biopsy, exfoliative cytology, and bacteriologic examination can also be helpful in confirming the diagnosis, but the presence of ulceration in the interdental papilla is the most indicative sign of this condition. Ulceration in the alveolar mucosa may be present in more advanced stages of the disease.

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30. Mercury vaporization is an amalgam restorative procedure utilizing well-sealed, premeasured capsules is MOST likely to occur during

Explanation

During the condensation step of the amalgam restorative procedure, the premeasured capsules are condensed and shaped to fill the prepared cavity. This involves applying pressure to the capsules, which can cause the mercury to vaporize. The other options, such as mulling, carving, trituration, and high-speed evacuation, do not involve the same level of pressure or manipulation of the capsules, making condensation the most likely step for mercury vaporization to occur.

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31. 33 yr old female come with slow growing swelling in the angle of the mandible radiograph show radio-opaque with radio-lucent border dignosis

Explanation

The correct answer is cementoblastoma. Cementoblastoma is a rare benign tumor that arises from the cementum, a calcified substance that covers the roots of teeth. It typically presents as a slow-growing swelling in the jaw, often in the angle of the mandible. On radiographs, it appears as a radio-opaque mass with a well-defined radiolucent border. Osteoma and osteosarcoma are both bone tumors, but they do not typically present with the same radiographic features as cementoblastoma.

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32. Facial nurve supply:

Explanation

The answer "more than 12 blades" suggests that the facial nerve supply is extensive and complex. This could indicate that the facial nerve innervates a large number of muscles and structures in the face, requiring a greater number of blades for dissection or surgical procedures. It implies that the facial nerve has multiple branches and provides motor and sensory innervation to various regions of the face.

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33. Cementum contain cell like bone and it is ellow in color in vital, extracted, or avulsed tooth but in non vital tooth, its color is dark

Explanation

The statement is incorrect. Cementum does not contain cells like bone. Cementum is a mineralized tissue that covers the root surface of teeth. It is not yellow in color in vital, extracted, or avulsed teeth. The color of cementum can vary depending on various factors, such as age and oral health, but it is not necessarily dark in non-vital teeth.

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34. Which of the following principles should be considered in constructing complete dentures for a patient with a debilitating disease ?

Explanation

In constructing complete dentures for a patient with a debilitating disease, all of the above principles should be considered. Maximum extension is important to ensure proper support and stability of the dentures. A narrow occlusal table helps in maintaining proper occlusion and preventing excessive forces on the dentures. A non-pressure impression technique is necessary to minimize discomfort and trauma to the patient's oral tissues. Therefore, all of these principles are crucial in providing the best possible denture treatment for a patient with a debilitating disease.

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35. Which of the following muscles originates from the zygomatic process of the maxilla?

Explanation

82

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36. Flat bone grow by endochondral ossification

Explanation

Flat bones do not grow by endochondral ossification. Endochondral ossification is the process by which long bones, such as the femur or humerus, grow and develop. It involves the replacement of cartilage with bone tissue. Flat bones, on the other hand, develop through a different process called intramembranous ossification. In this process, bone tissue forms directly within a membrane, without the involvement of cartilage. Therefore, the statement that flat bones grow by endochondral ossification is false.

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37. The only method by which the hinge axis can be ACCURATELY located is by:

Explanation

61

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38. For the best results when using an elastomeric impression material, the prepared tooth should be

Explanation

80

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39. Which of the following influence tooth temperature during a cutting procedure?

I. Diameter of the bur
II. Sharpness of the bur
III. Bur/tooth contact time
IV. Type of coolant used
V. Amount of force applied to the bur

Explanation

The diameter of the bur, sharpness of the bur, bur/tooth contact time, type of coolant used, and amount of force applied to the bur all influence tooth temperature during a cutting procedure. The diameter of the bur affects the surface area of the tooth being cut, which can impact temperature. The sharpness of the bur determines how efficiently it cuts, which can affect the temperature generated. The bur/tooth contact time refers to how long the bur is in contact with the tooth, which can influence temperature. The type of coolant used helps to dissipate heat and can impact temperature. The amount of force applied to the bur can also affect the temperature generated during the cutting procedure.

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40. If pulp exposure is anticipated, final removal of carious tooth structure is accomplished after the

Explanation

The correct answer is "rubber dam has been placed" because a rubber dam is a protective barrier that isolates the tooth being treated from saliva and other contaminants in the mouth. By placing the rubber dam before the final removal of carious tooth structure, the dentist ensures a clean and dry operating field, reducing the risk of contamination and infection. This step is particularly important when pulp exposure is anticipated to prevent bacteria from entering the pulp chamber and causing further damage or infection.

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41. A broken stress or non-rigid type fixed bridge is indicated when

Explanation

A broken stress or non-rigid type fixed bridge is indicated when the retainers cannot be prepared to draw together without excessive tooth reduction. This means that the retainers cannot be designed in a way that allows them to come together without removing too much of the natural teeth. In such cases, a non-rigid type bridge is used to replace two or three missing teeth, ensuring that the retainers do not require excessive tooth reduction.

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42. The setting time of a zinc oxide-eugenol impression paste may BEST be accelerated by

Explanation

47 g

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43. Attraction or fixation of microorganisms in areas of inflammation is known as

Explanation

Anachoresis refers to the attraction or fixation of microorganisms in areas of inflammation. This process occurs when microorganisms are drawn to inflamed tissues or organs, where they can proliferate and cause further infection or damage. It is a key mechanism in the spread and progression of infectious diseases.

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44. Functions of the dental pulp include all ot eh following EXCEPT

Explanation

The dental pulp is responsible for several functions in the tooth, including support, sensory perception, dentin repair, and circulation. However, it does not play a direct role in cementum repair. Cementum is a specialized tissue that covers the root of the tooth, and its repair is primarily carried out by cementoblasts, which are cells located in the periodontal ligament. Therefore, the dental pulp does not have a direct involvement in cementum repair.

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45. During examination of an edentulous patient wearing old dentures, the tissues under the denture base appear unusually hypermic with small petechial hemorrhages present.  This condition most likely results from the patient's

Explanation

GR 26

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46. The pt gingiva is described as pink , firm and stippled; however he complains of "bleeding gums" and bleeds upon probing.  Which of the following statements is NOT true ?

Explanation

The correct answer is "The probing was done too vigorously." This is because if the pt gingiva is described as pink, firm, and stippled, but the patient complains of bleeding gums and bleeds upon probing, it indicates that there is inflammation present in the superficial tissues. The disease may or may not be chronic in nature, but the statement about the probing being done too vigorously is not true as it does not explain the bleeding gums and inflammation.

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47. What would be the effect of drying the prepared tooth with alcohol and warm air before cementation of a crown rather than wiping it dry ?

Explanation

Drying the prepared tooth with alcohol and warm air before cementation of a crown can increase the possibilities of pulp damage. This is because alcohol and warm air can dehydrate the tooth structure, making it more brittle and susceptible to damage. Additionally, the drying process can remove any protective moisture or natural lubrication in the tooth, causing friction and potential damage during crown placement. Therefore, it is important to properly wipe the tooth dry to minimize the risk of pulp damage.

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48. An outline form of a cavity preparation is the

Explanation

The correct answer is "shape or form of the preparation of the surface of the tooth." This means that the outline form of a cavity preparation refers to the shape or form of the preparation on the surface of the tooth. It does not refer to the shape or form after carious dentin has been excavated or after the retention form has been completed.

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49. For a more rigid structure, a base-metal partial denture alloy should be selected rather than a Type IV gold because the alloy has a

Explanation

48

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50. In a estorative problem involving all teeth in the mouth, the protrusive condylar path inclination has its PRIMARY influence on

Explanation

The protrusive condylar path inclination refers to the angle at which the mandibular condyle moves forward during protrusive movements of the jaw. This angle influences the movement and guidance of the teeth during these movements. In a restorative problem involving all teeth in the mouth, the primary influence of the protrusive condylar path inclination is on the mesial inclines of mandibular cusps and distal inclines of maxillary cusps. This means that the way the teeth come together and guide each other during protrusive movements is primarily determined by the inclines of these specific cusps.

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51. Recent years, there has been an evidence that he prevalence and intensity of the caries attack has been diminishing in the more economically developed countries , mainly because o the wide spread use of: 

Explanation

P

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52. Gingivitis during pregnancy results from an

Explanation

During pregnancy, hormonal changes can alter the body's response to local irritation, leading to gingivitis. This means that the tissue in the gums may react differently to the usual irritants, causing inflammation and overgrowth of tissue. It is not solely caused by an overgrowth of tissue unrelated to local irritation or an increase in local irritation by an alteration of the saliva, but rather a combination of these factors.

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53. A pt complains of sensitivity in a mandibular premolar.  A well condensed Class V amalgam restoration was placed in that tooth five months previously with no discomfort for the 1st four months.  Since then it has becum increasingly sensitive. 
The problem probably relates to

Explanation

The most likely explanation for the increasing sensitivity in the mandibular premolar with a well-condensed Class V amalgam restoration is irreversible pulpal damage. This means that the pulp, which contains nerves and blood vessels, has been damaged to the point where it cannot heal or recover. This can occur due to various reasons, such as deep decay, trauma, or extensive dental work. As the pulp becomes more damaged over time, it can lead to increased sensitivity and discomfort in the tooth.

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54. 72 hours after inserting a relined distal extension partial prosthesis, vertical movement of the base if noted.  Causes would likely to be:

i. Ridge tissue changes occurring since the reline impression

ii.Failure to properly orient the metal framework to the contacted teeth during reline impression procedures

iii. Premature occlusal contacts

Explanation

The correct answer is ii, iii. The vertical movement of the base of the relined distal extension partial prosthesis can be attributed to two causes. Firstly, failure to properly orient the metal framework to the contacted teeth during the reline impression procedures can lead to instability and movement of the base. Secondly, premature occlusal contacts can also contribute to the vertical movement of the prosthesis. These two factors, when combined, can result in the observed vertical movement of the base.

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55. Mobility in midface with step deformity n front zygomatic suture diagnosos

Explanation

The given symptoms of mobility in the midface with a step deformity in front of the zygomatic suture suggest a diagnosis of Lefort II fracture. Lefort II fractures involve the maxilla and nasal bones, causing separation of the midface from the skull base. This type of fracture typically results from a significant impact to the midface region, such as a high-velocity trauma. It is characterized by mobility and displacement of the midface, including the zygomatic arches. Therefore, the correct answer is Lefort II.

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56. A 39 yr old pt has 32 unrestored teeth.  The only defects are deep-stained grooves in the posterior teeth.  The emplorer catches in the grooves, but there is no evidence of softness.

The treatment of choice is

Explanation

Based on the information provided, the patient is 39 years old and has 32 unrestored teeth with deep-stained grooves in the posterior teeth. However, there is no evidence of softness or any other issues. Given this, the correct answer of "no treatment" can be justified as there is no indication or evidence of any problems or decay in the teeth. Therefore, no treatment is necessary in this case.

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57. Mechanical separators used in class III direct filling gold procedures should routinely be stabilized to
i. minimize trauma to the gingival tissues
ii. afford opportunity for greater amount of separation
iii. provide more rigid resistance to the forces of condensation
iv. provide uniform support during instrumentation. 

The correct answer is:

Explanation

The correct answer is i, iii, iv. Mechanical separators used in class III direct filling gold procedures should be stabilized to minimize trauma to the gingival tissues, provide more rigid resistance to the forces of condensation, and provide uniform support during instrumentation. This ensures that the procedure is performed with precision and reduces the risk of damage to the surrounding tissues.

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58. Powdered gold offers the advantage if reduced chair time for placement over gold foil. 
This can be attributed to its GREATER

Explanation

Powdered gold offers the advantage of reduced chair time for placement over gold foil because it has a greater mass per unit volume. This means that a smaller amount of powdered gold can cover a larger area compared to gold foil, saving time during the placement process.

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59. Polyvinyle siloxane compared with polysulfide

Explanation

Polyvinyl siloxane is a type of dental impression material that can be poured after 7 days. This means that the material can be used to take an impression of the teeth and then poured into a mold to create a model of the teeth after a waiting period of 7 days. This is in contrast to polysulfide, another type of dental impression material, which may not have the same waiting period and may need to be poured immediately. Therefore, the correct answer is that polyvinyl siloxane can be poured after 7 days.

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60. Crown with open margin can be due to

Explanation

Putting die spacer on the finishing line can lead to a crown with an open margin. Die spacer is a material used to create space between the prepared tooth and the final crown restoration. If the die spacer is applied too close to the finishing line, it can cause the crown to have an open margin, where the crown does not fully cover the prepared tooth. This can result in a poorly fitting crown and potential issues with the restoration's longevity and function.

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61. The type of load on teeth that is MOST destructive to the periodontium is the

Explanation

78

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62. Free-way space is synonymous with

Explanation

69

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63. The application of rubber dam for Class V facial preparation to include #212 clamp on a mandibular second premolar requires the hole for the second premolar punched

i. larger than usual
ii. smaller than usual
iii. slightly the lingual of the other holes in the arch
iv. slightly the facial of the other holes in the arch

Explanation

gr 42

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64. A reason for replacing silicate cement and unfilled resin restorations in the distal surfaces of maxillary canines is that the restorations

Explanation

The reason for replacing silicate cement and unfilled resin restorations in the distal surfaces of maxillary canines is that these restorations will not maintain the mesiodistal dimension of the tooth. This means that the restorations will not properly fill the space between the canines, which can lead to problems with the alignment and spacing of the teeth.

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65. Pure gold can be contaminated when it comes in contact with

Explanation

Pure gold can be contaminated when it comes in contact with moisture because moisture can cause oxidation of the gold surface, leading to the formation of tarnish or corrosion. This can result in a change in the appearance and properties of the gold, affecting its purity.

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66. Bracing of the partial denture framework is best accomplished by the

Explanation

The bracing of the partial denture framework is best accomplished by the rigid reciprocal arm and the body of the clasp. This combination provides stability and support to the denture framework, ensuring that it stays in place during normal oral functions such as chewing and speaking. The rigid reciprocal arm helps to distribute the forces evenly, while the body of the clasp provides additional retention and stability. Using both components together ensures a secure and comfortable fit for the partial denture.

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67. A pt complains when brushing tooth which has  complete veneer cast gold crown.
The MOST probable cause of this pain is

Explanation

The most probable cause of the patient's pain when brushing their tooth with a complete veneer cast gold crown is occlusal interference in centric and working relations. This means that there is an issue with how the crown is fitting with the opposing teeth and how it functions during biting and chewing. This can cause discomfort and pain when pressure is applied during brushing.

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68. Mounted diagnostic casts in removable partial denture treatment planning are ESSENTIAL for selecting the:

i. type of denture base
ii.areas of support
iii.areas of retention
iv. type of supplied teeth
v. major connector

Explanation

Mounted diagnostic casts in removable partial denture treatment planning are essential for selecting the type of denture base, areas of support, and type of supplied teeth. The casts provide a three-dimensional representation of the patient's oral structures, allowing the dentist to accurately assess the available support and retention areas. This information is crucial in determining the appropriate type of denture base and teeth that will best fit the patient's specific needs. Additionally, the mounted casts help in designing the major connector, which is responsible for connecting the various components of the partial denture. Therefore, options i, ii, and iv are correct.

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69. Polysulfide impression materials set FASTER as a result of
i. low relative humidity
ii. decreasing the temperature of the mixing pad below the dew point of the room
iii. decreasing the temp of the mixing slab
iv. a high ambient temp

Explanation

Polysulfide impression materials set faster when the temperature of the mixing pad is decreased below the dew point of the room (ii) and when the ambient temperature is high (iv). Lowering the temperature of the mixing slab helps to accelerate the setting process. However, low relative humidity (i) and decreasing the temperature of the mixing slab (iii) do not have a significant effect on the setting time of polysulfide impression materials.

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