Mode of failure during dislodgement of prosthesis cemented with zinc poly carboxylate cement is usually seen at the_____________?
Correct answer: B. Cement prosthesis interface
- A. Cement tooth interface
- B. Cement prosthesis interface
- C. Cleavage through the cement layer
- D. Fracture of tooth or prosthesis
Explanation
Zinc polycarboxylate cement bonds more strongly to tooth structure than to the restoration, partly through carboxyl groups interacting with tooth calcium. Dislodgement therefore usually occurs at the cement-prosthesis interface.
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