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[判断题]
室温硫化型硅橡胶印模材料的催化剂是硅酸乙酯。()此题为判断题(对,错)。
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第1题
Syneresis refers to( )
A.the expansion ofa hydrocolloid impression material when it takes in water
B.the contraction of a hydrocolloid impression material when it exudes water
C.the fact that the sol and gel temperatures ofthe hydrocolloid differ
D.the inclusion ofpowder in a hydrocolloid impression material
请帮忙给出正确答案和分析,谢谢!
第2题
Which of the following impression materials set by physical means( )
A.agar
B.ZOE
C.alginate
D.addition silicone
请帮忙给出正确答案和分析,谢谢!
第4题
用个别托盘以中稠度聚醚印模材料制取四分之一区位的印模。在托盘与口腔结构间保持常规的2mm间隙。在取出印模后,发现有几处撕裂。再次取印模时,应采取哪些措施来减少撕裂发生的可能性?
请帮忙给出正确答案和分析,谢谢!
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