Dental Simulation Examination 1

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Quizzes Created: 1 | Total Attempts: 251

Questions: 100 | Attempts: 251 | Updated: Mar 22, 2023

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This is Your Dental Simulation 7 from KSA
You would answer 100 items
You have 120 minutes to finish
Passing is 70%
PLEASE DON'T EXIT UNTIL YOU SEE THE ANSWERS, AND MAKE SURE TO HAVE A STRONG INTERNET CONNECTION

Questions and Answers

1.

To clean the biting or chewing surfaces of the teeh, hold the bristles so they are
- A.
  
  Straight up
- B.
  
  Slightly to the right
- C.
  
  Straight down
- D.
  
  Slightly to the left
Correct Answer
C. Straight down

Explanation
To clean the biting or chewing surfaces of the teeth effectively, it is recommended to hold the bristles of the toothbrush straight down. This position allows the bristles to make direct contact with the teeth, ensuring thorough cleaning. Holding the bristles straight down also helps in reaching the deep grooves and crevices on the biting surfaces, where food particles and plaque tend to accumulate. It allows for better control and maneuverability while brushing, resulting in a more comprehensive and efficient cleaning process.

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2.

To prevent gum disease, floss and brush with a
- A.
  
  Soft toothbrush
- B.
  
  Medium Toothbrush
- C.
  
  Hard Toothbrush
- D.
  
  None of the Above
Correct Answer
A. Soft toothbrush

Explanation
Using a soft toothbrush is recommended to prevent gum disease because it is gentle on the gums and less likely to cause irritation or damage. Hard or medium toothbrushes can be too abrasive and may lead to gum recession or enamel erosion. By using a soft toothbrush, one can effectively remove plaque and debris from the teeth and gums without causing harm. Therefore, a soft toothbrush is the best choice for maintaining good oral hygiene and preventing gum disease.

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3.

The most common sites of mouth cancer are
- A.
  
  Teeth and gums
- B.
  
  Tongue and floor
- C.
  
  Roof of the mouth
- D.
  
  Gums and tongue
Correct Answer
B. Tongue and floor

Explanation
Mouth cancer commonly occurs on the tongue and floor of the mouth. These areas are particularly susceptible to developing cancer due to their exposure to various risk factors such as tobacco use, excessive alcohol consumption, and viral infections like human papillomavirus (HPV). The tongue and floor of the mouth have a high concentration of cells and are constantly in contact with food and other substances, making them more prone to damage and the development of cancerous cells. Regular self-examinations and dental check-ups are important for early detection and treatment of mouth cancer in these areas.

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4.

Brush no more than
- A.
  
  1 time a day
- B.
  
  2 times a day
- C.
  
  3 times a day
- D.
  
  4 times a day
Correct Answer
C. 3 times a day

Explanation
Brushing your teeth three times a day is the recommended practice for maintaining good oral hygiene. This frequency allows for the removal of plaque and food particles that can lead to tooth decay and gum disease. Brushing after meals helps to prevent the build-up of bacteria and keeps your breath fresh. However, brushing more than three times a day may cause damage to your tooth enamel and gums, as excessive brushing can be abrasive. Therefore, it is important to strike a balance and brush your teeth three times a day for optimal oral health.

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5.

Brushing with toothpaste at least twice a day is most important in preventing dental decay.
- A.
  
  Whitening
- B.
  
  Tartar control
- C.
  
  Sensitive
- D.
  
  Fluoride
Correct Answer
D. Fluoride

Explanation
Brushing with toothpaste that contains fluoride at least twice a day is most important in preventing dental decay. Fluoride is a mineral that helps to strengthen tooth enamel and make it more resistant to acid attacks from bacteria in the mouth. It also helps to reverse early signs of tooth decay. Therefore, using a fluoride toothpaste regularly can help protect teeth and prevent cavities.

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6.

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 phase of an amalgam restorative procedure, the well-sealed, premeasured capsules containing mercury are mixed with alloy particles. This mixing process, known as trituration, can cause the mercury to vaporize. Therefore, the correct answer is condensation.

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7.

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
8.

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 mandible moves forward during protrusive movements. This inclination primarily influences the contact between the mandibular and maxillary teeth. Specifically, it affects the mesial inclines of the mandibular cusps and the distal inclines of the maxillary cusps. These inclines determine the guidance of the teeth during protrusive movements, ensuring proper occlusion and preventing interferences. Therefore, the correct answer is "mesial inclines of mandibular cusps and distal inclines of maxillary cusps."

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9.

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
10.

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 cause 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 on the finishing line, it can create excess space, leading to an open margin where the crown does not fit snugly against the tooth. This can compromise the seal and fit of the crown, potentially causing issues such as leakage, sensitivity, or recurrent decay.

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11.

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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12.

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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13.

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 is overextended borders, where the borders of the denture extend beyond the natural boundaries of the mouth. By reducing these overextended borders, the denture can be adjusted to fit properly and provide better stability and comfort for the patient. Narrowing the teeth, tightening the brace arms, and tightening the retention arms are not relevant to correcting this specific issue.

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14.

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 direction. These fibers help to connect the tooth to the surrounding bone and provide support and stability to the tooth. The oblique arrangement allows for flexibility and shock absorption during chewing and biting forces.

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15.

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) presents several problems when constructing a complete denture prosthesis. These problems include requiring careful occlusion, usually cuspless teeth are indicated, and having a great range of jaw movement in function. However, it does not require a minimum interocclusal distance.

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16.

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
The patient's symptoms of pain, bad breath, and bleeding gingival, along with the onset over the weekend while studying for exams, suggest a diagnosis of acute necrotizing ulcerative gingivitis. This condition is characterized by painful, inflamed gums with ulceration and necrosis. Stress and poor oral hygiene can contribute to the development of this condition, which is commonly seen in young adults. The other options, such as making up to skip school or acute periodontal cyst, do not align with the patient's symptoms and history.

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17.

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 to prevent or treat any potential infections that may arise due to the compromised immune response.

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18.

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.

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19.

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, including formative, mechanical, and sensory functions. The formative function refers to its role in the formation and maintenance of the periodontal tissues. The mechanical function involves providing support and stability to the teeth, allowing them to withstand the forces of chewing and biting. The sensory function involves transmitting sensory information, such as pressure and pain, from the teeth to the brain. Therefore, all of the given options accurately describe the functions of the periodontal ligament.

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20.

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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21.

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 both micro leakage decrease with aging and being the least technique sensitive of all current direct restorations. This means that over time, the likelihood of leakage around the restoration decreases, and it is less prone to being affected by the technique used during the restoration process. Therefore, the correct answer is 1 & 2.

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22.

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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23.

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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24.

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 there is a high ambient temperature (iv). A lower relative humidity (i) and decreasing the temperature of the mixing slab (iii) do not have an effect on the setting time of polysulfide impression materials.

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25.

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 symptoms described in the question, such as painful mouth, palpable submandibular lymph nodes, and fever, along with the presence of inflamed gingiva and alveolar mucosa, ulceration, and heavy and viscous saliva, are consistent with acute herpetic gingivostomatitis. This condition is caused by the herpes simplex virus type 1 (HSV-1), which commonly affects young children. Moniliasis, erythema multiforme, necrotizing ulcerative gingivitis, and cysticercosis do not match the symptoms described.

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26.

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 bleeding upon probing is a sign of inflammation in the gingiva, indicating that there is an underlying issue causing the bleeding. The statement suggests that the bleeding is due to the probing technique being too forceful, but in reality, the bleeding is a result of inflammation and not the probing itself.

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27.

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, gingivitis can occur due to various factors. One possible explanation is an alteration in the tissue response to local irritation. This means that the body's normal response to irritation in the gums is changed, leading to an overgrowth of tissue and inflammation. Additionally, an increase in local irritation can also contribute to gingivitis during pregnancy. This can be caused by hormonal changes that affect saliva production and composition. Therefore, all of the given options - overgrowth of tissue unrelated to local irritation, increase in local irritation by alteration of saliva, and alteration in tissue response to local irritation - can contribute to gingivitis during pregnancy.

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28.

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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29.

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. It is a process where microorganisms are drawn to sites of inflammation, such as wounds or infected tissues. This can occur due to various factors, including the release of chemical signals or the presence of favorable conditions for microbial growth. This phenomenon plays a crucial role in the immune response and the progression of infections.

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30.

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 composition of dentin consists of 60-65% inorganic material by weight, which is equivalent to 70% inorganic material by volume. This means that the majority of dentin is made up of inorganic substances. Additionally, dentin contains 25% water by weight, which is equivalent to 12% water by volume. Finally, dentin also contains 43% organic material by weight, which is equivalent to 20% organic material by volume.

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31.

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

Explanation
The statement is false because compomer and glass ionomer (GI) do not have the same fluoride content. Compomer is a type of dental material that combines the benefits of composite resin and glass ionomer, but it does not contain the same level of fluoride as GI. Glass ionomer, on the other hand, releases fluoride ions, which help in preventing tooth decay. Therefore, the correct answer is false.

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32.

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

Explanation
The best pontic is hygienic because it promotes oral health and prevents the accumulation of bacteria and plaque. A hygienic pontic is easy to clean and maintain, reducing the risk of infections and gum disease. It also ensures proper oral hygiene practices can be carried out effectively, contributing to overall oral health and well-being.

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33.

Artificial teeth best to be selected by
- A.
  
  Postextraction cord
- B.
  
  Preextraction cord
Correct Answer
B. Preextraction cord
34.

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 benefits of microfilled and macrofilled composites. It has a higher filler content, making it stronger and more wear-resistant than microfilled composites. The rough filler in hybrid composites provides better adhesion to the tooth structure, ensuring long-lasting restorations. Therefore, the combination of hybrid composite with rough filler is the most suitable option for posterior teeth restorations.

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35.

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 tumor that originates from the connective tissue. Fibromas are usually painless and appear as smooth, firm, and pinkish nodules. They are commonly found on the gums, tongue, or inside the cheeks. Papilloma is another benign tumor but it is less common in the oral cavity compared to fibroma. Lipoma, on the other hand, is a benign tumor composed of fat cells and is rarely found in the oral cavity. Therefore, fibroma is the correct answer as it is the most prevalent benign tumor in the oral cavity.

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36.

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

Explanation
Flat bones actually grow by intramembranous ossification, not endochondral ossification. In intramembranous ossification, bone tissue forms directly from mesenchyme or fibrous connective tissue, without the involvement of a cartilage precursor. This process is responsible for the formation of flat bones, such as the skull bones and the scapula. On the other hand, endochondral ossification occurs when bone tissue replaces a cartilage model, and it is responsible for the growth and development of long bones.

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37.

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

Explanation
The pulp chamber of the lower first molar is indeed mesially located. This means that it is positioned towards the front or middle of the tooth when viewed from the occlusal (biting) surface. This is a characteristic feature of the lower first molar and can be observed in dental anatomy.

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38.

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 because the light curing time for a simple shallow class III composite restoration typically ranges from 20 to 40 seconds. This is the amount of time needed for the light to adequately cure and harden the composite material, ensuring a strong and durable restoration. Curing for too short a time may result in an incomplete cure, while curing for too long may cause overheating and damage to the surrounding tooth structure. Therefore, 20 seconds is the recommended time for optimal results.

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39.

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

Explanation
Most dentin bonding materials require a conditioning time of 15 seconds. This is the amount of time needed for the material to effectively bond to the dentin surface. Conditioning the dentin helps remove the smear layer and exposes the collagen fibers, allowing for better adhesion of the bonding material. A shorter conditioning time may not be sufficient to achieve a strong bond, while a longer time may lead to over-etching and potential damage to the dentin. Therefore, a conditioning time of 15 seconds is ideal for most dentin bonding materials.

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1
0
40.

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
The correct answer is apical 1/3 because the apical region of the tooth is the most critical area to seal during root canal treatment. This is because it is the furthest point from the pulp chamber and is more likely to harbor bacteria and infection. By sealing the apical 1/3, the dentist ensures that the entire root canal system is effectively cleaned, shaped, and filled, reducing the risk of reinfection and promoting successful healing of the tooth.

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41.

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, specifically affecting movement and posture. It is characterized by impaired muscle coordination, stiffness, and involuntary movements. Seizures and learning disabilities can also be present in individuals with cerebral palsy, but they are not the primary features of the disorder. Therefore, the most appropriate answer is cerebral palsy.

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42.

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 ulceration in the interdental papilla, which is the triangular gum tissue between the teeth. Biopsy, exfoliative cytology, and bacteriologic examination can also help in confirming the diagnosis, but the presence of ulceration in the interdental papilla is the most indicative sign. Ulceration in the alveolar mucosa may be seen in more advanced stages of the condition.

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43.

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 final removal of carious tooth structure is done after the rubber dam has been placed. This is because the rubber dam provides isolation and moisture control, which is essential during the removal of carious tooth structure. It prevents contamination from saliva and other oral fluids, allowing for better visibility and control during the procedure. Additionally, the rubber dam helps in preventing the spread of bacteria and reduces the risk of pulp exposure.

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44.

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 forming the margins would still be intact and supported by the underlying dentin. This ensures the strength and stability of the enamel margins in the occlusal cavity prepared for amalgam.

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45.

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 a soft tissue located in the center of the tooth. It has several functions, including support, sensory perception, dentin repair, and circulatory supply to the tooth. However, it does not have a direct role in cementum repair. Cementum is a specialized tissue that covers the root of the tooth and helps anchor it to the surrounding bone and ligaments. Cementum repair is primarily carried out by cells called cementoblasts, which are not found in the dental pulp.

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46.

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 that is created on the surface of the tooth during the preparation process. It does not refer to the shape or form after carious dentin has been removed or after the retention form has been completed. The focus is specifically on the surface of the tooth and how it is prepared.

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47.

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
48.

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. They should also provide more rigid resistance to the forces of condensation and uniform support during instrumentation. These features help ensure the success of the procedure and reduce any potential harm to the patient's gingival tissues.

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49.

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 these restorations will not properly preserve the width of the tooth, which is important for maintaining proper occlusion and function.

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50.

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 increasing sensitivity in the mandibular premolar suggests that there may be irreversible pulpal damage. This means that the pulp tissue inside the tooth has been damaged to the point where it cannot heal or recover. It is likely that the pulp has become inflamed or infected, leading to the sensitivity. Marginal leakage or a fractured restoration could also cause sensitivity, but since the discomfort started after four months and has been increasing, irreversible pulpal damage is the most likely explanation. Toothbrush abrasion is less likely to cause sensitivity in this case.

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Current Version
Mar 22, 2023

Quiz Edited by
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Oct 02, 2015

Quiz Created by
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