不同桩核材料及箍结构对前牙抗折强度的影响  

Fracture strength of maxillary incisors after restoring by different post-core material and ferrules systems

作　　者：李铮 侯晓薇[2] 刘璇 张婉君 高琳 青刘静 LI Zheng;HOU Xiaowei;LIU Xuan;ZHANG Wanjun;GAO Linqing;LIU Jing(Department of Stomatology,The Second Hospital of Baoding,Baoding 071000)

机构地区：[1]河北省保定市第二医院口腔科,071000 [2]河北医科大学第三医院口腔科

出　　处：《现代口腔医学杂志》2020年第2期69-72,共4页Journal of Modern Stomatology

摘　　要：目的研究不同桩核材料及箍结构对前牙抗折强度的影响。方法选取28颗完整上颌中切牙随机分为四组:A1组:剩余釉牙骨质界上8mm牙体组织+镍铬合金桩修复;A2组:剩余釉牙骨质界上8mm牙体组织+低金合金桩修复;B1组:剩余釉牙骨质界上2mm牙体组织+镍铬合金桩修复;B2组:剩余釉牙骨质界上2mm牙体组织+低金合金桩修复。自凝包埋后,固定于生物力学试验机上,测试实验牙的抗折强度并观察其折裂类型,应用SPSS分析软件进行统计学分析。结果各组样本的折裂力值依次为:614.79±39.03N,438.73±28.20N,430.13±32.99N,411.94±47.46N。桩核材料对折裂强度有显著影响(P<0.05);箍结构形式对折裂强度有显著影响(P<0.05)。桩核材料和箍结构形式两个因素之间存在交互效应(P<0.05)。结论①不同桩核材料对桩核冠修复后的牙齿抗折强度有影响。②正常情况下,尽量使用弹性模量较低桩核材料,可在一定程度上改善破坏性牙折的发生率。③箍结构的形式对折裂强度有显著影响。④桩核材料的弹性模量和箍结构的形式两个因素之间存在交互效应。Objective To study the fracture strength of maxillary incisors after restoring by different post-core material and ferrules systems. Methods Twenty eight human maxillary incisors were divided into 4 groups randomly:Group A1: each tooth tissue were cut off at 8 mm level above the cement-enamel junction(CEJ), then be restored with Ni-Cr alloy post-core;Group A2: each tooth tissue were cut off at 8 mm level above the CEJ, then be restored with Au-Pd alloy post-core;Group B1: the tissue were cut off at 2 mm above the CEJ, then restored with Ni-Cr alloy post-core;Group B2: the tissue were cut off at 2 mm above the CEJ, then restored with Au-Pd alloy post-core. Each specimen was embedded in acrylic resin and then be fixed with a special jig in CMT7104 universal load-testing machine. Data of fracture strength were recorded just samples fracture occurred, fracture patterns were also recorded soon after. Results Twenty eight samples failed in the test: 614.79 ±39.03 N,438.73 ±28.20 N,430.13±32.99 N,411.94±47.46 N.The results showed the difference was significant with material factor(P <0.05);and the difference was also significant with ferrule factor(P<0.05). There was an interactive relationship between these two factors. Conclusion ①Different post-core material had an effect on tooth fracture strength. ②To make use of the post-core material which has a low elastic modulus, can reduce the incidence of destructive root fracture on a certain extent. ③The ferrule also had influence on fracture strength. ④There was an interactive relationship between different post-core materials and ferrule.

关 键 词：桩核 箍结构 折裂抗力 牙折形式 根管治疗牙 

分 类 号：R783.3[医药卫生—口腔医学]