上颌前磨牙不同固位型单端IPS e.max CAD粘接桥的抗折强度研究  

Flexural Strength of Maxillary Premolar Restored with Resin-bonded IPS e.max CAD Ceramic Cantilever Bridge in Different Retention-form Design

作　　者：李美康[1] 韩碧潭 王学谦 陈志宇[1] 安奕霖 马晓平 LI Meikang;HAN Bitan;WANG Xueqian;CHEN Zhiyu;AN Yilin;MA Xiaoping(Department of Prosthodontics,Hebei Key Laboratory of Stomatology,Hebei Clinical Research Center for Oral Diseases,School and Hospital of Stomatology,Hebei Medical University,Shijiazhuang 050017,China;School of Stomatology,Hebei Medical University,Shijiazhuang 050017,China;Restoration Technician's Studio of Hospital of Stomatology Hebei Medical University,Shijiazhuang 050017,China)

机构地区：[1]河北医科大学口腔医学院·口腔医院修复科,河北省口腔医学重点实验室,河北省口腔疾病临床医学研究中心,河北石家庄050017 [2]河北医科大学口腔医学院,河北石家庄050017 [3]河北医科大学口腔医学院·口腔医院技工中心,河北石家庄050017

出　　处：《口腔医学研究》2022年第12期1167-1170,共4页Journal of Oral Science Research

基　　金：2020年度河北省医学科学研究课题计划(编号:20201196);2022年河北省大中学生科技创新能力培育专项项目(编号:22E50058D);河北医科大学大学生创新性实验计划项目(编号:USIP2021325)。

摘　　要：目的:研究不同固位型设计对上颌前磨牙单端IPS e.max CAD粘接桥抗折强度的影响。方法:选取离体上颌前磨牙30颗,随机分为3组(n=10),A组:牙合支托固位型;B组:D形固位型;C组:覆盖腭尖型。制作IPS e.max CAD单端粘接桥,树脂水门汀粘接,万能力学试验机测试各组粘接桥的破坏载荷力值并观察折裂模式。结果:A组、B组、C组破坏载荷分别为(269.91±69.49)N、(279.79±35.21)N、(394.33±88.37)N。A组破坏载荷力值小于B组,差异不显著(P>0.05),C组破坏载荷力值大于A组和B组,且差异均有统计学意义(P<0.01)。折裂模式以粘接桥连接体处折裂最多。结论:3种固位型单端粘接桥均能满足临床修复需求,覆盖腭尖型单端粘接桥具有更佳的抗折性能。Objective:To study the influence of different retention form designs on the fracture resistance of resin-bonded IPS e.max CAD ceramic cantilever bridge for maxillary premolars.Methods:Thirty intact adult maxillary premolars were selected and divided into three groups randomly(n=10).Group A:single-retainer of occlusal rest;group B:single-retainer of D-shape;and group C:single-retainer covering the palatal cusp.Prostheses were fabricated with IPS e.max CAD blocks and then cemented with resin cement.Fracture strength and failure mode were tested in a universal testing machine.Results:The fracture strength of group A,group B,and group C were(269.91±69.49)N,(279.79±35.21)N,and(394.33±88.37)N.The fracture strength of group B was higher than that of group A,but the difference was not significant(P>0.05).Group C had significantly higher fracture strength than groups A and B(P<0.01).The predominant failure mode was connector fracture.Conclusion:All three types of resin-bonded cantilever bridges can meet clinical requirements.The design of single-retainer covering the palatal cusp exhibited promising fracture properties.

关 键 词：单端粘接桥 固位型 全瓷 破坏载荷 

分 类 号：R783.3[医药卫生—口腔医学]