Marginal leakage in dentin bonding is caused by:?!
Question:
Marginal leakage in dentin bonding is caused by:?
a. Differences in coefficients of thermal expansion of resin and tooth
structure
b. Polymerization shrinkage
c. Lack of a self sealing mechanism
d. Occlusal loading
1. a & b
2. a, b, & c
3. a, b,& d
4. all above
Answers:
My final answer is 4.
But I think the "occlusal loading" item is debatable. If you believe in the abfraction theory, then it would be true. If you don't, then the answer is 2.
But I'd stick with 4.
Am I right?