A. mm
B. 1.5 mm
C. mm
D. 2.5 mm
✅ The correct answer is option D. 2.5 mm.
Dental Materials
The average life of silicate cement restoration is______________?
A. 2 years
B. 4 years
C. 6 years
D. 8 years
✅ The correct answer is option B. 4 years.
Moisture contamination of amalgam can lead to_____________?
A. Marginal breakdown
B. Shrinkage
C. Delayed expansion
D. increased stresses
✅ The correct answer is option C. Delayed expansion.
Glass ionomer cements are composed of______________?
A. Alumino silicate powder and phosphoric acid
B. Aluminosillicate powder and polyacrylate
C. Zinc oxide powder and phosphoric acid
D. Zinc oxide powder and polyacrylate liquid
✅ The correct answer is option B. Aluminosillicate powder and polyacrylate.
The effect of trituration on strength in an amalgam restoration depends on______________?
A. Amalgam alloy
B. Trituration time
C. Speed of amalgamator
D. All of the above
✅ The correct answer is option D. All of the above.
For dental amalgam, the elastic modulus and tensile strength is______________?
A. 40 Gpa and 60 – 100 Mpa
B. 21 Gpa and 27 – 55 Mpa
C. 350 Gpa and 10 – 120 Mpa
D. 360 Gpa and 125 – 130 Mpa
✅ The correct answer is option B. 21 Gpa and 27 – 55 Mpa.
High strength amalgam is achieved by_____________?
A. Maximum matrix and minimum alloy phase
B. Minimum matrix and maximum alloy phase
C. Maximum matrix phase
D. Minimum alloy phase
✅ The correct answer is option B. Minimum matrix and maximum alloy phase.
Which one of the following restorative materials is having coefficient of thermal expansion close to that of tooth enamel and dentin ?
A. Microfilled composite resins
B. Pure gold
C. Silver amalgam
D. Type II Glass ionomer cement
✅ The correct answer is option D. Type II Glass ionomer cement.
Which of the following acts as accelerator in Zinc oxide eugenol______________?
A. ZnCl2 + Eugenol
B. ZnCl2 + ZnSO2
C. Eugenol + ZnO
D. Zn(OH)2 + ZnO
✅ The correct answer is option B. ZnCl2 + ZnSO2.
In porcelain metal elements are embedded in the matrix of________________?
A. Rubber matrix
B. Glass
C. Plastic
D. Resin matrix
✅ The correct answer is option B. Glass.