Resto Sem I
Board Exam Questions
1. The cavosurface margin of an amalgam preparation:
a. Should not be planed
b. Never contains unsupported enamel
c. Does not require a right angle margin
d. Must be planed to remove unsupported enamel
e. None of the above
An occlusal cavosurface bevel is contraindicated in the cavity preparation for an amalgam restoration. Attempt to provide a 90°-100° cavosurface angle results in a 80-90% of amalgam at the margins. The butt joint of enamel and amalgam creates the strongest margin.
Reference: The Art and Science of Operative Dentistry by Sturdevant p.196
2. An occlusal outline that has been prepared too wide:
a. Will not give the amalgam as much strength as a slight increase in depth
b. Will cause fracture of the amalgam
c. Will not cause fracture of the cusp
d. Will cause corrosion of the amalgam
The cavity preparation shouldn’t be wider than necessary especially on smaller teeth, when the occlusal portion may have a small distal tilt. This objective will help conserve the dentinal support and strength of the tooth and help minimize marginal deterioration of the restoration
Reference: The Art and Science of Operative Dentistry by Sturdevant p. 202-203
3. Moisture in an amalgam causes:
a. Increase in strength
b. Shrinkage in filling
c. No marginal breakdown
d. Excessive delayed expansion with protrusion of the filling
e. None of the above
Moisture contamination can create an expansion of such magnitude that it may not always be directed toward the outer surface of the restoration. Axially or pulpally directed expansion will exert tremendous pressure in the pulp-dentin organ. This can precipitate changes in the position and the environment of odontoblasts and surrounding tissues.
Reference: Operative Dentistry: Modern Theory and Practice by Marzauk, A.L. p.117
4. The greatest single factor in the strength of a final amalgam restoration is:
a. The residual mercury content
b. The lead content
c. The silver content
d. The copper content
e. All of the above
The more energy used in condensation, the less will be the residual mercury, which results in a higher relative percentage of the strong original particles in the restoration. Condensation of an amalgam mass after formation of the matrix crystals does not diminish the strength properties as trituration does, because there is more resistance to the crystal displacement during condensation than during trituration.
Reference: Operative Dentistry: Modern Theory and Practice by Marzauk, A.L. p.109
5. Overtrituration of alloy and mercury will:
a. Result in shrinkage of the mass during set
b. Result in expansion of mass during set
c. Cause no shrinkage during set
d. Result in fracture after setting
e. None of the above
Trituration makes a more coherent mass of amalgam mix which contributes to the greater strength pattern in the restoration. On the other hand, if trituration is continued after complete formation of the matrix crystals, the excess energy will create cracks in these crystals and their interphases leading to a drop in the strength of the set amalgam.
Reference: Operative Dentistry: Modern Theory and Practice by Marzauk, A.L., p.109
6. A chalky appearance of the marginal ridge suggests;
a. No need for radiographic examination
b. Underlying dental carries
c. No need for visual examination
d. Loss of translucency
e. None of the above
Cavitation of the surface occurs when the subsurface demineralization is so extensive that the tooth structure collapses. Cavitation of enamel is irreversible and is usually associated with an acceleration in the process of carious destruction of the tooth.
Reference: Operative Dentistry: Modern Theory and Practice by Marzauk, A.L., p. 51
7. The loss of translucency in a tooth or its discoloration suggests:
a. Pulpal hyperemia
b. Pulpal death
c. Pulpal abscess
d. Internal resorption
e. None of the above
The areas of enamel that lose their transluscency are products of extensive subsurface porosity caused by demineralization. It means there is stagnation of blood flow which in return results to necrosis or pulpal death.
Reference: Operative Dentistry: Modern Theory and Practice by Marzauk, A.L., p 50
8. A yellowish appearance to a tooth may suggest:
a. Secondary dentin deposition
b. Enlarged pulp chamber
c. Enlarged root canals
d. Necrosis of pulp
e. None of the above
Acute, rapidly advancing caries with very high levels of acid production overpowers dentinal defenses and results in infection. Small localized infections in the pulp produces inflammatory response involving capillary dilation, local edema and stagnation of blood flow.
Reference: Operative Dentistry: Modern Theory and Practice by Marzauk, A.L., p50
9. A visual inspection of restoration should attempt to find the following anatomic defects:
a. Absence of contour
b. Overcontour
c. Poor contact form
d. Faulty margins and overhangs on restorations
e. All of the above
All of the choices given should not be present whenever a restoration is made. It is important that there should be correct contour, absence of overhangs and proper contact with the adjacent tooth.
Reference: Operative Dentistry: Modern Theory and Practice by Marzauk, A.L., p. 51
10. Percussion produces pain when:
a. There is inflammation in the pulp
b. There is any degree of inflammation of periodontal or periapical tissues
c. A pulp stone is present
d. Swelling is present
e. None of the above
The pains are due to the stimulation of pulp tissue by movement of fluid through dentinal tubules that had been opened to the oral environment by cavitation.
Reference: Operative Dentistry: Modern Theory and Practice by Marzauk, A.L., p. 52
11. An irritated or inflamed pulp responds to the electric pulp test:
a. Later than normal pulp
b. Earlier than normal pulp
c. The same as the normal pulp
d. Fails to respond at all
e. None of the above
Since there is an existing bacterial infection close to the pulp, the reaction would be more sensitive than a normal pulp.
Reference: Operative Dentistry: Modern Theory and Practice by Marzauk, A.L., p.55
12. Operative dentistry is:
a. Purely mechanical
b. Treating a tooth
c. Devoid of physiologic and psychologic aspects
d. Treating the person
e. None of the above
Operative dentistry does not only confine itself in the mechanical aspect of treating the tooth. It abides with the patient’s well-being as the clinician treats a problem. It treats the physical as well as psychological aspect of the patient.
Reference: Operative Dentistry: Modern Theory and Practice by Marzauk, A.L., p.75
13. Use of anesthesia for cavity preparation is contraindication in the following:
a. Cardiovascular disease
b. Hyperthyroidism
c. Allergies
d. Emotional instability
e. All of the above
The components of the anesthetic, e.g. epinephrine, may trigger one or two of the diseases given. This in turn will be very hard to manage once anesthetic was given without any history taking. It is best to take down patient’s medical history for the safety of the patient’s wel-being.
Reference: Operative Dentistry: Modern Theory and Practice by Marzauk, A.L., p.83
14. The compound cavity involves:
a. Two surfaces of the tooth
b. Only one surface
c. More than three surfaces
d. Three surfaces
e. None of the above
Simple cavity denotes preparation on one surface of the tooth, while a compound cavity denotes preparationon two surfaces of the tooth.
Reference: Operative Dentistry: Modern Theory and Practice by Marzauk, A.L., p.77
15. Radiographic examination reveals:
a. Caries and indicates depth of caries to a degree
b. The extent of periodontal and periapical bone loss to a degree
c. Unerupted and impacted teeth
d. Number, size and shape of roots and roots canals
e. All of the above
The radiograph is one of the most helpful diagnostic tool in analyzing a tooth. A full-mouth radiographic examination will be a great device in locating caries, abnormalities and other pathologic findings and therefore making a better treatment plan.
Reference: Operative Dentistry: Modern Theory and Practice by Marzauk, A.L., p.53
16. The proper restoration for the tooth that has undergone root canal treatment:
a. Class II amalgam
b. Class II inlay
c. Class III inlay
d. Post full crown or cusp capping post inlay
e. None of the above
A tooth that has undergone a root canal treatment may have lost a desirable great amount of tooth structure. Therefore, a more stable restoration must be used in order to preserve the delicate tooth.
Reference: Operative Dentistry: Modern Theory and Practice by Marzauk, A.L., p.325
17. In splinting of anterior teeth:
a. Three-fourths of the lingual surface should be included in outline form
b. One-half of the lingual surface should be included in outline form
c. None of the lingual surface should be included in outline form
d. Entire lingual surface should be included in the outline form
e. None of the above
The amount of space on the lingual part will enhance the strength of the splint by providing more bulk of the composite material between the teeth.
Reference: Operative Dentistry: Modern Theory and Practice by Marzauk, A.L., p. 322
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