不同印模制取方式对单冠修复体颈缘适合性的影响

Influence of different impression methods on adaptability of single crown replacement to cervical margin

目的分别用翡翠藻酸钠和硅橡胶制取单冠固定修复模型,通过对基牙牙周指数的测定,了解不同印模制取方式对单冠修复体颈缘适合性的影响。方法本研究严格按照随机分配原则,共纳入患者59例,单冠修复体101颗,其中,翡翠藻酸钠组54颗(31例,A组);硅橡胶组47颗(28例,B组);自身对照牙101颗(C组)。结果单冠粘接后3d与10d,C组与A、B组的菌斑指数(PLI)和牙龈指数(GI)差异无统计学意义(P>0.05);龈沟出血指数(SBI)差异有统计学意义(P<0.01);粘接后1、3和6个月,对照组与实验组的PLI和GI差异有统计学意义(P<0.01),SBI几乎无差别;但不同印模制取方式(A组和B组)之间比较,牙周指数测定差异无统计学意义(P>0.05)。结论单冠修复在测定时间范围内,对基牙的牙周指数有影响;但翡翠藻酸钠和硅橡胶两种印模制取方式对单冠修复体颈缘适合性的影响无差别。

Objective Through the determination of abutment periodontal index(PI),to compare the effect of silicone rubber impression material versus alginate impression material on adaptability of single crown replacement to cervical margin.Methods 59 patients with teeth defect including 101 crowns were randomly divided into two groups:alginate group(A) had 54 crowns(n=31) and simatic group(B) had 47 crowns(n=28).Self-control group had 101 teeth.Results At the end of the third and tenth days after single crown adhesion,the plaque index(PLI) and gingival index(GI) were not significantly different between the two groups(P>0.05),while the sulcus bleeding index(SBI) was significantly different(P<0.01).In the 1,3 and 6 months after adhesion,there was significant difference of PLI and GI between the two groups(P<0.01),while the difference of SBI was not significant.The difference of PI was no significant between the two group(P>0.05).Conclusion The results suggest that the crown used to repair tooth defects has effect on abutment PI in the given period.The alginate impression material and the silastic have no difference in adaptability of single crown replacement to cervical margin.