玻璃陶瓷高嵌体和金属全冠修复根管治疗后下颌前磨牙的抗折强度  

Fracture resistance of endodontically treated mandibular premolars restored with e.max press all-ceramic onlays and metal crowns

作　　者：王玉善 周屹立 

机构地区：[1]宁波口腔医院特需科,浙江宁波315000

出　　处：《上海口腔医学》2015年第3期311-314,共4页Shanghai Journal of Stomatology

摘　　要：目的:比较玻璃陶瓷高嵌体和金属全冠修复经根管治疗后的下颌前磨牙的牙体抗折强度。方法:选择45颗完整的下颌前磨牙,经根管治疗后,随机分为3组。A组以流体树脂垫底,树脂充填作为对照组;B组和C组以流体树脂垫底后,牙体均预备为MOD洞型。B组以树脂充填后,再进行牙体预备,以钴铬合金金属全冠修复;C组牙体预备,以玻璃陶瓷高嵌体黏结修复。将3组标本用万能实验机垂直加载,直至标本发生纵裂,记录各样本牙裂时的最大载荷数值与折裂模式。采用SPSS13.0软件包对数据进行统计学分析。结果:A、B、C组的平均抗压载荷值分别为(234.44±44.36)、(267.11±65.55)、(314.91±33.67)N。2个实验组与对照组相比差异均有显著性(P<0.05);B组的抗压载荷值高于C组,差异有显著性(P<0.05)。3组样本牙折裂模式两两比较,结果显示组间差异均有显著性(P<0.05)。结论:玻璃陶瓷高嵌体是保护经根管治疗后的下颌前磨牙的较好方法。PURPOSE： To compare the fracture resistance of endodontically treated mandibular premolars restored with e.max press all-ceramic onlays and metal crowns. METHODS： Forty-five endodontically treated mandibular premolars were randomly divided into 3 groups. Group A were filled with resin as control. Specimens of group B and C were instrumented and prepared for two-wall cavities and restored with metal crowns and ceramic on]ays respectively. The specimens were thermocycled, exposed to cyclic loading, and submitted to the static fracture resistance test. Fracture loads and mode of failure were evaluated. The data was analyzed with SPSS13.0 software package. RESULTS： Samples in 2 experimental groups exhibited higher fracture load values than that of the control group （P〈0.05）. Group C showed higher fracture load values and more favourable fracture patterns compared with group B （P 〈0.05）. CONCLUSIONS： Endodontieally treated mandibular molars restored with indirect onlays provide significantly increased fracture resistance and favourable fracture patterns.

关 键 词：根管治疗 高嵌体 抗折强度 

分 类 号：R783[医药卫生—口腔医学]