Dental Practice Questions

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Quizzes Created: 1 | Total Attempts: 2,439

Questions: 69 | Attempts: 2,451 | Updated: Mar 22, 2023

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Dental Practice Questions

Questions and Answers

1.

Mercury vaporization is an amalgam restorative procedure utilizing well-sealed, premeasured capsules is MOST likely to occur during
- A.
  
  Mulling
- B.
  
  Carving
- C.
  
  Condensation
- D.
  
  Trituration
- E.
  
  High-speed evacuation
Correct Answer
C. Condensation

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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2.

Facial nurve supply:
- A.
  
  Less than 6 blades
- B.
  
  6-7 blades
- C.
  
  10-12 blades
- D.
  
  More than 12 blades
Correct Answer
D. More than 12 blades

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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3.

In a estorative problem involving all teeth in the mouth, the protrusive condylar path inclination has its PRIMARY influence on
- A.
  
  Incisal guidance
- B.
  
  Anterior teeth only
- C.
  
  Mesial inclines of mandibular cusps and distal inclines of maxillary cusps
- D.
  
  Mesial inclines of maxillary cusps and distal inclines of mandibular cusps
- E.
  
  Mesial inclines of maxillary cusps and lingual inclines of of mandibular cusps
Correct Answer
C. Mesial inclines of mandibular cusps and distal inclines of maxillary cusps

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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4.

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
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

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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5.

Crown with open margin can be due to
- A.
  
  Putting die spacer on finishing line
- B.
  
  Waxing not covering all crown prep
- C.
  
  Over contouring of crown prevent seating during insertion
- D.
  
  All of the above
Correct Answer
A. Putting die spacer on finishing line

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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6.

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
- A.
  
  Clenching his teeth
- B.
  
  Thermal expansion of the parts
- C.
  
  Uniform application of heat
- D.
  
  Thermal contraction of the parts
- E.
  
  Cleansing of the parts
Correct Answer
B. Thermal expansion of the parts

Explanation
GR 26

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7.

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 :
- A.
  
  Defective occlusion
- B.
  
  Exposed dentin at the bottom of the occlusal rest seat
- C.
  
  Galvanic action between the framework and an amalgam restoration
Correct Answer
A. Defective occlusion

Explanation
P 14

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8.

The lifting of a mandibular partial deture with distal extension bases may be corrected by
- A.
  
  Narrowing the teeth
- B.
  
  Reducing overextended borders
- C.
  
  Tightening the brace arms
- D.
  
  Tightening the retention arms
Correct Answer
B. Reducing overextended borders

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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9.

Periodontal ligament fibers in the middle third of the root is
- A.
  
  Oblique
- B.
  
  Horizontal
- C.
  
  Transeptal
Correct Answer
A. Oblique

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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10.

Orthognathic ridge relationship (class II ) present several problems, which should be taken into consideration when constructing a complete denture prosthesis. These include all EXCEPT:
- A.
  
  Require minimum interocclusal distance
- B.
  
  Require careful occlusion, usually cuspless teeth are indicated
- C.
  
  Have great range of jaw movement in finction
Correct Answer
A. Require minimum interocclusal distance

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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11.

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
- A.
  
  Acute necrotizing ulcerative gingivitis
- B.
  
  Making this up to skip school
- C.
  
  Rapidly progressive periodontiti
- D.
  
  Desquamative gingivitis
- E.
  
  Acute periodontal cyst
Correct Answer
A. Acute necrotizing ulcerative gingivitis

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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12.

Patient on treatment with steroids are placed on antibiotics after oral surgical procedures because:
- A.
  
  Antibiotics are synergistic to steriods
- B.
  
  The patient is more susceptble to infection
- C.
  
  Antibioitcs ingibits Herksheimer reaction
- D.
  
  Antibiotics is a mixture of ants and soda
Correct Answer
B. The patient is more susceptble to infection

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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13.

Which of the following influence tooth temperature during a cutting procedure?I. Diameter of the burII. Sharpness of the burIII. Bur/tooth contact timeIV. Type of coolant usedV. Amount of force applied to the bur
- A.
  
  I, II, III, IV
- B.
  
  I, II, III, IV, V
- C.
  
  I, II, IV
- D.
  
  I, II, III, V
- E.
  
  II, III, V
Correct Answer
B. I, II, III, IV, V

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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14.

The functions of periodontal ligament include
- A.
  
  Formative function
- B.
  
  Mechanical function
- C.
  
  Sensory function
- D.
  
  All of the above
Correct Answer
D. All of the above

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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15.

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 punchedi. larger than usualii. smaller than usualiii. slightly the lingual of the other holes in the archiv. slightly the facial of the other holes in the arch
- A.
  
  I only
- B.
  
  I, iv
- C.
  
  I, iii
- D.
  
  Ii, iv
- E.
  
  Ii, iii
Correct Answer
B. I, iv

Explanation
gr 42

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16.

It has been proven that amalgam restoration has the following characteristics. 1. Micro leakage decrease with aging of the amalgam restoration2. it is the least techniques sensitive of all current direct restorations3. High dimensional changes
- A.
  
  1, 2, and 3
- B.
  
  1 & 3
- C.
  
  1 & 2
- D.
  
  2 only
Correct Answer
C. 1 & 2

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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17.

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:
- A.
  
  Artificial water fluoridation
- B.
  
  Fluoride toothpaste
- C.
  
  Dental health education programs
- D.
  
  A & C
- E.
  
  All of the above
Correct Answer
D. A & C

Explanation
P

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18.

The setting time of a zinc oxide-eugenol impression paste may BEST be accelerated by
- A.
  
  Adding a drop of water to the mix
- B.
  
  Adding a drop of oleic acid to the mix
- C.
  
  Increasing the amount of zinc oxide
- D.
  
  Chilling the mixing slab and the spatula
Correct Answer
A. Adding a drop of water to the mix

Explanation
47 g

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19.

Polysulfide impression materials set FASTER as a result ofi. low relative humidityii. decreasing the temperature of the mixing pad below the dew point of the roomiii. decreasing the temp of the mixing slabiv. a high ambient temp
- A.
  
  I, ii, iv
- B.
  
  I, iii
- C.
  
  Ii only
- D.
  
  Ii, iv
- E.
  
  Iv only
Correct Answer
D. Ii, iv

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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20.

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
- A.
  
  Moniliasis
- B.
  
  Erythema multiforme
- C.
  
  Acute herpetic gingivostomatitis
- D.
  
  Necrotizing ulcerative gingivitis
- E.
  
  Cystelcosis
Correct Answer
C. Acute herpetic gingivostomatitis

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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21.

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 ?
- A.
  
  Inflammation must still remain in the deeper tissues
- B.
  
  The disease must be chronic in nature
- C.
  
  The probing was done too vigorously
- D.
  
  None of the above
Correct Answer
C. The probing was done too vigorously

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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22.

Gingivitis during pregnancy results from an
- A.
  
  Overgrowth of tissue which is unrelated to local irritation
- B.
  
  Increase in local irritation by an alteration of the saliva
- C.
  
  Alteration the tissue response to local irritation
- D.
  
  All of the above
Correct Answer
C. Alteration the tissue response to local irritation

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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23.

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:
- A.
  
  Thermal testing
- B.
  
  Percussing the tooth
- C.
  
  Radio graphic exam
- D.
  
  Electric pulp testing
Correct Answer
B. Percussing the tooth

Explanation
288

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24.

Attraction or fixation of microorganisms in areas of inflammation is known as
- A.
  
  Glapedesis
- B.
  
  Anachoresis
- C.
  
  Synthrophism
- D.
  
  Focal infection
- E.
  
  Panadol
Correct Answer
B. Anachoresis

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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25.

Dentin composition
- A.
  
  60-65 inorganic by wgt (70% inorganic by volume)
- B.
  
  25% water by wgt (12% water by volume)
- C.
  
  43% organic by wgt (20@ organic by volume)
Correct Answer
A. 60-65 inorganic by wgt (70% inorganic by volume)

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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26.

Compomer has same flouride as GI
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

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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27.

Best pontic is
- A.
  
  Hygienic
- B.
  
  Ridge lap
- C.
  
  Saddle
Correct Answer
A. Hygienic

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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28.

Artificial teeth best to be selected by
- A.
  
  Postextraction cord
- B.
  
  Preextraction cord
Correct Answer
B. Preextraction cord

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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29.

Composite for posterior teeth
- A.
  
  Microfilled + fine filler
- B.
  
  Hybrid + rough filler
- C.
  
  Microfilled + rough filler
Correct Answer
B. Hybrid + rough filler

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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30.

The most common benign tumor in oral cavity is
- A.
  
  Fibroma
- B.
  
  Papilloma
- C.
  
  Lipoma
Correct Answer
A. Fibroma

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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31.

Flat bone grow by endochondral ossification
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

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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32.

Pulp chamber is lower 1st molar is mesially located
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

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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33.

Light curing time for simple shallow class III composite
- A.
  
  10 sec
- B.
  
  15 sec
- C.
  
  20 sec
- D.
  
  40 sec
Correct Answer
C. 20 sec

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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34.

Most of dentin bonding material need conditioning time of
- A.
  
  15sec
- B.
  
  30sec
- C.
  
  45sec
- D.
  
  60sec
- E.
  
  90sec
Correct Answer
A. 15sec

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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35.

The most important in RCT is to seal
- A.
  
  Apical 1/3
- B.
  
  Middle 1/3
- C.
  
  Cervical 1/3
Correct Answer
A. Apical 1/3

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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36.

Handicapped pt with lesion in central nervous system appears to have different type of disorders in movement and posture:
- A.
  
  Seizure
- B.
  
  Learning disability
- C.
  
  Cerebral palsy
Correct Answer
C. Cerebral palsy

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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37.

Diagnosis of early necrotizing ulcerative gingivitis is BEST made on the basis of
- A.
  
  Biopsy
- B.
  
  Exfoliative cytology
- C.
  
  Ulceration of the interdental papilla
- D.
  
  Bacteriologic examination (smear)
- E.
  
  Ulceration in the alveolar mucosa
Correct Answer
C. Ulceration of the interdental papilla

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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38.

If pulp exposure is anticipated, final removal of carious tooth structure is accomplished after the
- A.
  
  Final outline form of the cavity has been established
- B.
  
  Rubber dam has been placed
- C.
  
  Cavity has been sterilized
- D.
  
  None of the above
Correct Answer
B. Rubber dam has been placed

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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39.

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
- A.
  
  Enamel rods forming the margins would still be full length and supported on dentin
- B.
  
  Tomes Fibres would be strengthened
- C.
  
  Enamel rods forming the margins need not be full length
- D.
  
  All of the above
Correct Answer
A. Enamel rods forming the margins would still be full length and supported on dentin

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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40.

Functions of the dental pulp include all ot eh following EXCEPT
- A.
  
  Support
- B.
  
  Sensory
- C.
  
  Cementum repair
- D.
  
  Dentin repair
- E.
  
  Circulatory
Correct Answer
C. Cementum repair

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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41.

An outline form of a cavity preparation is the
- A.
  
  Shape or form of the preparation of the surface of the tooth
- B.
  
  Shape or form of the preparation after carious dentin had been excavated
- C.
  
  Shape or form of the preparation assumes after the retention form has been completed
Correct Answer
A. Shape or form of the preparation of the surface of the tooth

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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42.

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
- A.
  
  Application of a topical fluoride compound
- B.
  
  Conservative class I amalgam
- C.
  
  BIS-GMA pit and fissure sealant
- D.
  
  No treatment
- E.
  
  All of the above
Correct Answer
D. No treatment

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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43.

Mechanical separators used in class III direct filling gold procedures should routinely be stabilized toi. minimize trauma to the gingival tissuesii. afford opportunity for greater amount of separationiii. provide more rigid resistance to the forces of condensationiv. provide uniform support during instrumentation. The correct answer is:
- A.
  
  I, ii
- B.
  
  I, iii, iv
- C.
  
  I, ii, iii
- D.
  
  Ii, iv
- E.
  
  All of the above
Correct Answer
B. I, iii, iv

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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44.

A reason for replacing silicate cement and unfilled resin restorations in the distal surfaces of maxillary canines is that the restorations
- A.
  
  Discolor and are not esthetic
- B.
  
  Cannot be placed to establish contact
- C.
  
  Will not maintain the mesiodistal dimension of the tooth
- D.
  
  Cannot be properly finished in this area and thus will cause gingival irritation
Correct Answer
C. Will not maintain the mesiodistal dimension of the tooth

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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45.

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
- A.
  
  Marginal leakage
- B.
  
  Fractured restoration
- C.
  
  Irreversible pulpal damage
- D.
  
  Toothbrush abrasion
Correct Answer
C. Irreversible pulpal damage

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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46.

Powdered gold offers the advantage if reduced chair time for placement over gold foil. This can be attributed to its GREATER
- A.
  
  Pellet size
- B.
  
  Mass per unit volume
- C.
  
  Cohesiveness
- D.
  
  Malleability
Correct Answer
B. Mass per unit volume

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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47.

Chemicomechanical loss of tooth tissue is termed as
- A.
  
  Erosion
- B.
  
  Abrasion
- C.
  
  Attrition
- D.
  
  Decalcifcation
Correct Answer
A. Erosion

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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48.

Bracing of the partial denture framework is best accomplished by the
- A.
  
  Rigid reciprocal arm and the flexible part of the retentive arm of the clasp
- B.
  
  Rigid reciprocal arm and the body of the clasp
- C.
  
  Rigid reciprocal arm of the clasp
- D.
  
  None of the above
Correct Answer
B. Rigid reciprocal arm and the body of the clasp

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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49.

A broken stress or non-rigid type fixed bridge is indicated when
- A.
  
  Retainers can be designed to have equal retentive qualities
- B.
  
  Two or three missing teeth to be replaced
- C.
  
  Retainers cannot be prepared to draw together without excessive tooth reduction
Correct Answer
C. Retainers cannot be prepared to draw together without excessive tooth reduction

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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50.

Which of the following principles should be considered in constructing complete dentures for a patient with a debilitating disease ?
- A.
  
  Maximum extension
- B.
  
  Narrow occlusal table
- C.
  
  Non-pressure impression technique
- D.
  
  All of the above
- E.
  
  None of the above
Correct Answer
D. All of the above

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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Current Version
Mar 22, 2023

Quiz Edited by
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Nov 12, 2009

Quiz Created by
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