Which preparation has the highest configuration factor (C-factor) for a directly bonded composite restoration?
- Correct answer
Class I occlusal preparation
-
Class IV preparation
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Class II proximal slot preparation
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Direct facial veneer preparation
This question is one of 15 in AFK practice: Restorative, prosthodontics and implants. Test yourself on all of them.
Practice quiz FlashcardsExplanations
The C-factor is the ratio of bonded to unbonded surfaces; a Class I box has five bonded walls and one free surface (C = 5), which maximizes polymerization shrinkage stress. A Class IV or veneer has few bonded walls and much free surface, so its C-factor is low.
Source: Sakaguchi and Powers, Craig's Restorative Dental Materials — oneguy
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