单选题进行窝沟封闭时为达到理想的黏结效果,乳牙酸蚀时间是()A10sB30sC60sD2minE5min
单选题
进行窝沟封闭时为达到理想的黏结效果,乳牙酸蚀时间是()
A
10s
B
30s
C
60s
D
2min
E
5min
参考解析
解析:
窝沟封闭的操作在牙面清洁之后的步骤是酸蚀,酸蚀剂用30%~40%的磷酸液,酸蚀时间为恒牙20~30s,乳牙60s,所以C正确,酸蚀时间过短会使树脂与釉质黏结不牢,所以A、B不选。酸蚀时间过长会引起牙本质暴露而疼痛不适,所以D、E不选。故选C。考点:窝沟封闭乳牙酸蚀时间
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单选题进行窝沟封闭时为达到理想的粘接效果,乳牙酸蚀时间是()A10sB30sC60sD2minE5min