1.Toilet of cavity is:

A. Removal of debris by washing with H2O.
B. Removal of debris by cold air spray.
C. Removal of debris by hot air spray.
D. Washing the cavity with soap solution.

Answer:A

2.Most common fracture occurring in amalgam restoration is Seen at:

A. Cavosurface margin.
B. The contact area.
C. The isthmus area.
D. Proximal box.

Answer : C
The axio-pulpal line angle should be beveled to reduce the concentration of stresses and provide grater bulk of material in the isthmus area, which is liable to fracture.

3.Which one of the following statements about cavity preparations is FALSE?

A.Class II cavity preparations for amalgam restorations must be extended onto the occlusal surface to provide adequate retention
B.If thin walls remain following a multisurface cavity preparation, these should be reduced and a cuspal coverage restoration provided
C.Resin composite should not be used to restore a cavity with subgingival margins
D.The ‘slow’ hand piece should be used with water

Answer : A

4.Tooth surfaces involved in class II design 6 are:

A. Occlusal, proximal, part of facial and lingual surfaces.
B. Occlusal, facial and lingual surfaces.
C. Proximal and facial/ lingual surfaces.
D. Proximal, axial angle and facialcervical

Answer : A

5.Class III amalgam restorations are usually prepared on:

A. Distal surfaces of anterior teeth.
B. Mesial surfaces of canine.
C. Distal surfaces of canine.
D. Distal surfaces of incisors and mesial surfaces of canine.

Answer : C

Classification of cavity— G. V. Black
CLASS I CAVITY
1) Pits & fissures
2) Occlusal surface of premolars & molars
3) Occlusal 2/3 rd of buccal & lingual surface
4) Lingual surface of maxillary incisors
CLASS II CAVITY
1) Restoration on Proximal surface of posterior teeth
CLASS III CAVITY
1)Restoration on the proximal surface of the anterior teeth that do not involve incisal edge.
CLASS IV CAVITY
1)Restoration on the proximal surface of anterior teeth that do involve the incisal edge .
CLASS V CAVITY
1) Restoration on the gingival third of the facial / lingual surfaces of all teeth.
CLASS VI CAVITY
1) Restoration on incisal edge of anterior teeth and occlusal cusp height of posterior teeth.
2) It is given by Simon.

6.When preparing a cavity the size of the access is dictated by:

A.The type of bur used in the air rotor
B. The need to remove excess tooth tissue
C. The need to allow access to the decay
D. The rule of extension for prevention

Answer: C.
Cavity preparation should avoid unnecessary removal of sound tissue and should be as small as possible whilst allowing access to the decay.

7.In a cavity preparation cavo-surface margin will be junction between:

A. Cavity wall/ floor and adjacent tooth surface.
B. Cavity wall and floor.
C. Floor of occlusal box and approximial box.
D. Approximial wall of one tooth with another.

Answer : A
Cavo surface angle : The cavo surface angle is the angle of the tooth structure formed by the junction of a prepared cavity wall and the external surface of the tooth.

8. The optimum depth of a self threading pin for an amalgam restoration is:

A. 0.5 mm.
B. 1 mm.
C. 2 mm.
D. 4 mm.

Answer: C

9.  G.V. Black concluded that the following areas on tooth surface are relatively non self cleanable:

A. Pits and fissures.
B. Tips and cusps.
C. Crests of marginal/ crusing ridges.
D. All inclined planes of cusps and ridges.

Answer : A

10. Caries-affected dentine:

A. Contains bacteria
B. Is demineralised
C. Is the same as caries-infected dentine
D. Should always be removed when a cavity is present

Answer: B.
Caries-affected dentine is demineralised but without infection and can be left during cavity preparation, depending on the choice of restorative material.