Pitting of direct filling old restoration usually results from_________________?

Related Mcqs:

1. A patient who has had a recent amalgam filling in the upper teeth has a gold filling in the lower teeth, the patient complains of pain. The reason for this can be mainly_____________?

   A. Improper amalgam filling B. Pulp exposure C. Galvanism D. None of the above...

2. Which of the following is true about direct filling gold______________?

   A. Properly condensed mat gold has no voids B. Whatever may be the type voids are inherent C. Voids can be avoided with manual condensation D. None of the above...

3. Direct filling gold formed by electrolytic precipitation is called by all the terms EXCEPT______________?

   A. Crystalline B. Granular gold C. Mat gold D. Sponge gold...

4. The main advantage of composites over unfilled direct filling resin is their_____________?

   A. Higher solubility in saliva B. Lower modulus of elasticity C. Esthetic excellence D. Lower thermal co-efficient of expansion...

5. The highest mercury concentration in amalgam filling is found_____________?

   A. At the margin of the restoration B. In the centre of the restoration C. In the deepest part of the restoration D. None of the above...

6. Increase in the residual mercury in silver amalgam filling can_____________?

   A. Cause fracture of the filling B. Tarnish and corrosion C. Increase the strength D. Decrease condensation pressure...

7. According of ADA specification No or number 1, the minimum compressive strength for silver amalgam filling aftr one hour should be________________?

   A. 80 Mpa B. 140 Mpa C. 260 Mpa D. 510 Mpa...

8. Inferior thyroid artery arises from_________________?

   A. 1st part of subclavian artery B. Thyrocervical trunk of 1st part of subclavian artery C. 3rd part of subclavian artery D. Internal carotid artery...

9. Facial muscles are derived from_________________?

   A. 1st branchial arch B. 2ndbranchial arch C. 3rdbranchial arch D. 4thbranchial arch...

10. Estesin pearls are cysts that arise from_________________?

    A. Squamous tissue of the mucosa B. Connective tissue of the mucosa C. Rests of malassez D. Dental lamina...