全瓷冠不同边缘形态对龈沟液中内毒素的影响

Influence of different marginal morphology of all ceramic crown on endotoxin in gingival crevicular fluid

目的探讨2种全瓷冠肩台设计形态对修复前、后龈沟液中内毒素含量的影响。方法将要求上颌中切牙全瓷冠修复的就诊患者随机分为90°肩台组和凹形肩台组,每组20颗患牙。应用动态浊度法测定修复前,修复粘结后1、3、6、12个月的龈沟液样本内毒素含量,进行统计学处理。结果全瓷冠修复粘结后1个月和3个月,90°肩台组龈沟液内毒素含量明显高于凹形肩台组,经t检验差别有统计学意义(P<0.05)。90°肩台组和凹形肩台组修复粘结后1和3个月与修复前、修复粘结后6、12个月均有差异,经F检验差异显著(P<0.01)。90°肩台组和凹形肩台组修复粘结后6、12个月与修复前内毒素含量无显著差异,经F检验差别无统计学意义(P>0.05)。结论全瓷冠建议采用凹形肩台预备,牙周组织在全瓷冠修复后6个月可以恢复到修复前水平。

Objective To investigate the changes of the levels of endotoxin in gingival crevicular fluid（GCF） before and after restoration with two kinds of all-ceramic crown shoulder designs.Methods Patients whose maxillary central incisors needed all ceramic crowns were divided randomly into 90° shoulder margin group and chamfer margin group,with 20 teeth in each group.Kinetic turbidimetric assay was used to analyze the content of endotoxin in GCF before tooth reparation and 1,3,6 and 12 months after cementation.Then statistics analysis was preformed.Results 1 and 3 months after the crown restoration,the content of endotoxin in GCF in 90° shoulder margin group was obviously higher than that of chamfer margin group,showing statistically significant difference by t test（P〈0.05）.6 and 12 months after the crown restoration in two groups,the content was different with that of two groups either before tooth reparation or 1,3 months after all ceramic crown cementation,showing statistical significance by the F test（P〈0.01）.Two groups had no significant difference in the content of endotoxin between 6,12 months after restoration and before tooth reparation.No statistical significance was found after the F test（P〈0.05）.Conclusions The chamfer margin of all ceramic crown is suggested to be used in preparation of all ceremic crowns.The periodontal tissue can recover six months after restoration.