1. Universal matrix band retainer is also known as

A. Ivory 8 retainer
B. Tofflemire retainer
C. Sequiland retainer
D. None of the above

Ans. B
Universal matrix band is called as Tofflemire retainer. It is ideal when three surfaces (mesial , occlusal , distal) are prepared and commonly used for the two surface class II restorations.

2. Matrix band is difficult to place on…………… teeth

A. MO 25
B. DO 37
C. DO 24
D. MO 24

Ans. D
Concave or fluted surfacr present on the mesial side of maxillary first premolar makes the adaptation of matrix band difficult. Wedge wedging technique is used to hold the matrix band tightly.

3. Automatrix is a

A. Matrix system that automatically gets attached with retainer and the tooth
B. System whete a single retainer can be used for all matrix bands
C. Retainer less matrix system designed for any tooth regardless of its circumference
D. Retainer less matrix system designed for any tooth with specific circumference

Ans. C

4. What is the thickness of class II matrix band

A. 0.002 inches
B. 0.002mm
C. 0.02inches
D. 0.02mm

Ans. A

5. Wedging im the interproximal areas in case of recession is called

A. Piggy back
B. Tie back
C. Tie through
D. None of the above

Ans. A

6. Retainer less matrix that can be used for all teeth

A. Tofflemeir
B. Ivory no 1
C. Universal
D. Automatrix

Ans. D

7. Which tooth separator works on traction principle

A. Ferrior
B. Wedge
C. Elliot
D. Ivory

Ans. A

8. In which of the condition “piggy back” wedging is indicated

A. Proximal caries with gingival recession
B. Tooth with fluted surface
C. Class II with wide proximal box
D. Narrow class II cavity

Ans. A

9. Honing machine is used for

A. CAD CAM inlay fabrication
B. Polishing restorations
C. Mechanical sharpening of instruments
D. Caries detection

Ans. C

10. Ferrier double dow seperator works on the principle of

A. Wedge principle
B. Traction principle
C. Slow seperation
D. Delayed tooth movement

Ans. B