第3题
Which of the following promote microleakage ofamalgam( )
A.the micron-size gao that always exists between the amalgam and tooth structure
B.amalgam’s higher coeffiaient ofthermal expansion compared to that of tooth structure
C.use poor condensation technique
D.all ofthe above
请帮忙给出正确答案和分析,谢谢!
第4题
Which of the following is TRUE concerning creep( )
A.Typically results in bulk fracture of the restoration
B.Is comhlon in high copper alloys
C.Occurs more frequently within the eta phase
D.Correlates with marginal breakdown
请帮忙给出正确答案和分析,谢谢!
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