RESTORATIVE BOARD EXAM QUESTION
1.) These are therapeutic materials placed in deep portions of the cavity preparation. They possess specific pharmacological activities and should be covered with or carried in a supporting base.
a. Subbases
b. Bases
c. Liners
d. Varnishes
Explanation: SUBBASES are used to have a level of fixation of which it is of great importance and use.
2.) Large Class II cavities are best restored by:
a. Gold foil
b. Gold overlays
c. Amalgam with pins
d. Gold castings
Explanation: Amalgam with pins offers more retention and resistance form.
3.) Reparative dentin is produced by:
a. Cavity preparations
b. Pulpectomy
c. Pulpotomy
d. None of the above
Explanation: Reparative dentin is formed in response to an irritant, such as caries, disease, or drilling to prepare a cavity for filling.
4.) These are cavities on the proximal surfaces of incisors and canines that involve the incisal angle:
a. Class I
b. Class II
c. Class III
d. Class IV
Explanation: Class I are cavities on pits and fissure, Class II are located on the proximal surfaces of posterior while Class III are cavities on the proximal surfaces of incisors and canines that do not involve the incisal angle.
5.) According to the number of surfaces involve, these are cavities that involves two surfaces of a tooth:
a. Simple
b. Compound
c. Complex
d. None of the above
Explanation: Simple involves only one surface while complex three or more surfaces of a tooth.
6.) What is the use of articulating ribbon?
a. For measurement and locating premature contact
b. For locating parasites on the fillings
c. For locating fractures
d. For locating rough areas on fillings
Explanation: Articulating ribbons marks the points of contact made by the teeth when a patient bites or grinds on it.
7.) What hand cutting instrument is primarily used to remove softened dentin from a carious tooth?
a. Hatchet
b. Excavator
c. Gingival margin trimmer
d. Chisel
Explanation: Hatchet is used to remove undermined enamel, gingival margin trimmer for placing a bevel along to gingival margin of the preparation while chisel is used to cleave or split undermined enamel.
8.) What restorative material is ideally for Class V abrasion/erosion lesions?
a. Composite resin
b. Glass ionomer
c. Amalgam
d. All of the above
Explanation: Glass ionomer is ideally the choice of material for Class V lesions because of its long-term retention value. It has the ability to form a chemical bond to enamel and dentin. Its fluoride release makes it ideal for use in patients with high susceptibility to caries.
9.) According to G.V. Black, how many steps are there in cavity preparation?
a. 4
b. 5
c. 6
d. 7
Explanation: There are 7 steps in cavity preparation namely: outline form, resistance form, retention form, convenience form, removal of remaining decay, finishing of enamel margins or walls, and toilet or cleansing of the cavity.
10.) What type of cavity preparation for composite resins which has a “box-like” wall with beveled enamel margin?
a. Conventional preparation design
b. Beveled conventional preparation design
c. Modified cavity preparation
d. None of the above
Explanation: Conventional preparation design is characterized by a butt joint marginal configuration and presence of retention grooves and coves in dentin while modified cavity preparation has no specific cavity wall configuration.
11.) Refers to the carrying of the marginal outline to the points it will occupy in the finished restoration – or refers to the extent of the preparation on the surface of the tooth:
a. Outline form
b. Resistance form
c. Retention form
d. Convenience form
Explanation: Resistance form is the internal form of a cavity which enables the tooth and restoration to best resist or withstand the forces of mastication, retention form enables the restoration to resists displacement while convenience form is the extension of the preparation so that it may be most conveniently seen approached, and restored.
12.) What is the next step after obtaining the convenience form?
a. Retention form
b. Removal of remaining decay
c. Finishing the enamel margins and/or walls
d. Toilet or cleansing of the cavity
Explanation: Retention form is done before doing the convenience form followed by removal or remaining decay, finishing the enamel margins and/walls and toilet or cleansing of the decay.
13.) In this type of instrument grasp, the triangle of forces is formed by the ball of the thumb, the palm, and the second finger:
a. Modified palm-and-thumb grasp
b. Reverse (inverted) pen grasp
c. Palm-and-thumb grasp
d. None of the above
Explanation: From the modified pen grasp, the reverse pen grasp is assumed by rotating the wrist making the working end of the instrument face the operator while in the palm-and-thumb grasp, the instrument handle is held between the palm and the four fingers.
14.) These are abrading tools ideally used for removal of tooth enamel. They are the hardest and most efficient among the abrasive stones:
a. Diamond stones
b. Hand cutting instruments
c. Excavator
d. None of the above
Explanation: Hand cutting instruments include those used in refining cavity walls and floors, line and point angles and in removing caries while excavator is primarily used to remove softened dentin from a carious tooth.
15.) Refers to the junction among three walls or between two walls and the floor.
a. Point angle
b. Wall
c. Cavosurface margin
d. Line angle
Explanation: Wall is relatively flat plane within a cavity, line angle is the junction between two adjacent walls while cavosurface margin is the surface periphery of the tooth preparation.
16.) Refers to the surface periphery of the cavity preparation.
a. Cavosurface margin
b. Line angle
c. Point angle
d. Wall
Explanation: Cavosurface margin is the junction between the cavity or floor and the adjacent tooth surface. It takes the name of the surface where it is located.
17.) Which of the following cavosurface margins is the only one that us beveled when preparing a class two amalgam preparation?
a. The occlusal cavosurface margin
b. The facial cavosurface margin of the proximal box
c. The lingual cavosurface margin of the proximal box
d. The gingival cavosurface margin of the proximal box
Explanation: This box is beveled only if it is in enamel to remove any unsupported enamel. The bevel is usually placed with a gingival margin trimmer.
18.) Which circumference of the matrix band is always placed toward the occlusal surface of the tooth?
a. Smaller
b. Larger
c. Both openings of the band have the same circumference
Explanation: This will accommodates the larger tooth circumference at the contact level. In addition the diagonal slot opening on the tofflemire matrix retainer is always placed facing the gingival.
19.) Which preparation has a proximal cavosurface margin that forms a 90 degree angle with the external surface?
a. A conservative class two amalgam
b. A conservative class two inlay
c. None of the above
d. Both of the above
Explanation: The preparation should have that degree to achieve the retention
20.) When mixing a zinc phosphate cement, a cool glass slab is used to:
a. Accelerate the setting time
b. Create more free zinc oxide in the set cement
c. Increase the powder-liquid ratio
d. Increase expansion of the set cement
Explanation: The cool glass slab also helps to increase the working time that operator has.
References:
A Comprehensive Review of Dentistry by Louis J Boucher, 1979
Art and Science of Operative Dentistry 4th edition
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