[牙合]贴面的预备设计和纤维桩对穿髓型楔状缺损抗折性分析  

Study on the fracture resistance of preparation designs of occlusal veneer and fiber posts in pulp-penetrating wedge-shaped defects

作　　者：张雨晴 陈如婷 武郭敏 张红艳[1,2] Zhang Yuqing;Chen Ruting;Wu Guomin;Zhang Hongyan(Stomatological College of Anhui Medical University,The Affiliated Stomatological Hospital of Anhui Medical University,Anhui Province Key Laboratory of Oral Diseases Research,Hefei 230032;Dept of Dentistry and Pulp,The Affiliated Stomatological Hospital of Anhui Medical University,Hefei 230032)

机构地区：[1]安徽医科大学口腔医学院,安徽医科大学附属口腔医院,安徽省口腔疾病研究重点实验室,合肥230032 [2]安徽医科大学附属口腔医院牙体牙髓科,合肥230032

出　　处：《安徽医科大学学报》2023年第10期1786-1792,共7页Acta Universitatis Medicinalis Anhui

基　　金：安徽省高校自然科学研究项目(编号:KJ2020A0165);安徽医科大学口腔医学院资助—峰原提升项目(编号:2022xkfyts10)。

摘　　要：目的探讨不同[牙合]贴面的预备设计和纤维桩对穿髓型楔状缺损的上颌前磨牙断裂载荷和断裂模式的影响。方法将60颗上颌第一前磨牙随机分为纤维桩组和树脂组,每组30颗。纤维桩组用玻璃纤维桩和树脂核修复,树脂组仅用树脂核填充。分别用[牙合]贴面(G2)、颊[牙合]贴面(G3)和颊邻[牙合]贴面(G4)修复离体牙,将复合树脂充填(G1)和全冠修复(G5)的牙齿分别设为阴性和阳性对照,每组6颗。牙齿经过5000次冷热循环和20000次垂直压缩载荷老化。再对所有牙齿以0.5 mm/min的速度进行静态加载,直至断裂。记录下来每颗牙齿的断裂载荷和断裂模式。结果纤维桩组和树脂组的组内断裂载荷均为G5>G3>G2>G4>G1,且G2、G3、G4、G5的断裂载荷显著高于G1,差异有统计学意义(P<0.05)。与树脂组比较,纤维桩组组间断裂载荷差异无统计学意义(P>0.05)。G3断裂形式多为修复体脱粘接,有利于再次修复。结论颊[牙合]贴面修复穿髓型楔状缺损牙齿的效果最理想,纤维桩不能显著增强穿髓型楔状缺损牙齿的断裂载荷。Objective To investigate the effects of different occlusal veneer preparation designs and fiber posts on the fracture load and failure mode of endodontically treated maxillary premolars with pulp-piercing wedge-shaped defect.Methods 60 maxillary first premolars were randomly divided into group A and group B after Root Canal Therapy(RCT)and severe defects(n=30).Group A was filled with glass fiber post and resin core,and group B was filled with resin core only.Then the occlusal veneer(G2),buccal-occlusal veneer(G3)and buccal-proximal-occlusal veneer(G4)were applied to the isolated teeth.The teeth filled with composite resin(G1)and full crown(G5)were set as negative and positive control respectively,with 6 samples in each group.The sample was subjected to 5000 hot and cold cycles and 20000 vertical compression load aging.Finally,all the samples were loaded with static load until the sample broke at the speed of 0.5mm/min.The fracture load and failure mode of each sample were recorded.Results Both the fracture load in group A and B was G5>G3>G2>G4>G1,and the fracture load in G2,G3,G4,G5 was significantly higher than that in G1(P<0.05),and there was no significant difference between group A and B(P>0.05).The fracture form of G3 was mostly unbonding of the repair body,which was conducive to re-repair.Conclusion Buccal(occlusal)veneer is the most effective in repairing pulp-piercing wedge-shaped defects.The fiber post could not significantly enhance the fracture load of the pulp-piercing wedge-shaped defects teeth.

关 键 词：[牙合]贴面 楔状缺损 断裂载荷 断裂模式 

分 类 号：R783.3[医药卫生—口腔医学]