CAD/CAM一体化纤维桩核修复薄弱根管的冠向微渗漏研究

摘要

目的：观察计算机辅助设计与制作（CAD／CAM）一体化纤维桩核修复薄弱根管的冠向微渗漏大小。方法：选择单根管前磨牙60颗，完善根管治疗后制备成薄弱根管形态。分组制作粘接 CAD／CAM一体化纤维桩核（A 组）、预成单支纤维桩＋流体树脂核（B 组）和铸造金钯金属桩核（C 组），每组20颗。印度墨水染色4周后脱矿脱水透明化处理，体视显微镜下观察染料渗入情况并分析统计学差异。再将标本完全脱矿，观察微渗漏产生的界面。结果：3种桩核修复薄弱根管后根管壁与桩核之间均存在微渗漏，A 组与 C 组冠方微渗漏无显著性差异（P ＞0．05），均明显小于 B 组（P ＜0．05）。A 组、C 组微渗漏多产生在桩核与树脂水门汀之间，B 组则多出现于树脂水门汀与根管壁之间。结论：CAD／CAM一体化纤维桩核修复薄弱根管的冠方微渗漏多产生于桩核与粘接剂界面，大小与金属桩组相似且均明显小于单支纤维桩＋树脂核组。%Objective:To study the coronal microleakage of flared root canal teeth restored with computer aided design and computer aided manufacturing (CAD/CAM)fiber post and core.Methods:60 extracted human mandibular premolars with single canal were divided into 3 groups randomly(n =20).The roots of the teeth were restored with CAD/CAM glass fiber post and core(group A), prefabricated glass fiber post(group B)and gold alloy dowel-and-core(group C)respectively.The specimens were immersed in India ink for 4 weeks.Subsequently all teeth were demineralized,dehydrated and rendered transparent.Then coronal microleakage was ob-served with stereomicroscope.Nonparametric data were analyzed.After that,All the specimens was demineralized completely in nitric acid,Then the interface between the post,resin cement and canal wall was observed and recorded.Results:The microleakage was found in all the 3 groups,group A and C showed less microleakage than group B(P <0.05).But no difference was detected between group A and C(P >0.05).Microleakage mostly appeared at the interface between post and resin cement in group A and C,while in group B,it appeared between resin cement and the wall of root canal totally.Conclusion:CAD/CAMfiber post and core demonstrates less coronal microleakage than prefabricated glass fiber post.