不同垫底材料和固位深度高嵌体修复上颌前磨牙的抗折性能研究  

Study on fracture resistance of maxillary premolars restored by onlays with different base materials and retention depths

作　　者：吴洁[1] 张钊[1] 袁硕[1] 马晓平 WU Jie;ZHANG Zhao;YUAN Shuo;MA Xiaoping(Department of Prostodontics,Hebei Key Laboratory of Stomatology,Hebei Clinical Research Center for Oral Diseases,School and Hospital of Stomatology,Hebei Medical University,Shijiazhuang 050017)

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,石家庄050017 [2]河北医科大学口腔医院技工中心

出　　处：《现代口腔医学杂志》2023年第4期256-260,共5页Journal of Modern Stomatology

基　　金：2021年度河北省医学科学研究课题计划(20210174)。

摘　　要：目的比较不同垫底材料和固位深度的高嵌体修复上颌前磨牙的抗折强度。方法收集80颗离体上颌第一前磨牙,随机分为8组(A无垫底树脂组;B1复合树脂垫底、2 mm固位深度组;B2复合树脂垫底、3 mm固位深度组;B3复合树脂垫底、4 mm固位深度组;C1流动树脂垫底、2 mm固位深度组;C2流动树脂垫底、3 mm固位深度组;C3流动树脂垫底、4 mm固位深度组;D对照组,完整离体牙)。将A-C组离体牙制备为邻牙合缺损1/3洞形,根管治疗后按设计制作IPS e.max CAD高嵌体并粘接在基牙上。于万能力学试验机上测试所有样本抗折强度并记录折裂模式。结果各组抗折强度分别为A(697±104)N、B1(859±113)N、B2(1021±132)N、B3(1101±127)N、C1(714±107)N、C2(844±119)N、C3(972±122)N、D(807±111)N。垫底树脂及固位深度的不同对高嵌体抗折强度的影响有统计学意义(P<0.05)。各组不可修复折裂样本分别为A(10/10)、B1(2/10)、B2(5/10)、B3(10/10)、C1(1/10)、C2(3/10)、C3(9/10)、D(5/10)。无垫底树脂及固位深度4 mm组不可修复折裂数量显著高于其他组(P<0.05)。结论垫底树脂存在时,固位深度大的高嵌体抗折强度更高,随之发生不可修复折裂的样本量增多,制备高嵌体固位深度不宜超过3mm。同种固位深度下,以复合树脂作为垫底材料的高嵌体较流动树脂垫底高嵌体抗折强度更高,应优先选用复合树脂作为高嵌体垫底材料。Objective To compare fracture resistance of maxillary premolars restored by onlays with different base materials and retention depths.Methods 80 isolated maxillary first premolars were collected and randomly divided into 8 groups(A non-resin base group;B1 composite resin base,2mm retention depth;B2 composite resin base,3mm retention depth;B3 composite resin base,4mm retention depth;C1 flow resin base,2mm retention depth;C2 flow resin base,3mm retention depth;C3 flow resin base,4mm retention depth;D the control group which was consisted of intact teeth).Isolated teeth of A-C groups were prepared into 1/3 defect of proximal-occlusal cavity,after root canal treatment,IPS e.max CAD onlays were made according to the design and bonded to the abutment teeth.Fracture resistance was measured on a universal testing machine and the fracture mode was observed.Results Fracture resistance of each group was A(697±104)N、B1(859±113)N、B2(1021±132)N、B3(1101±127)N、C1(714±107)N、C2(844±119)N、C3(972±122)N、D(807±111)N,influence of different base resins and retention depths on fracture resistance of onlay was statistically significant(P<0.05).Irreparable fracture samples in each group were A(10/10)、B1(2/10)、B2(5/10)、B3(10/10)、C1(1/10)、C2(3/10)、C3(9/10)、D(5/10),number of irreparable fractures in non-base resin group and 4mm retention depth group was significantly higher than that of the other groups(P<0.05).Conclusion When there is a base resin present,onlays with greater retention depth have higher fracture resistance,resulting in an increase in the number of samples with irreparable fractures,preparation of onlay should not exceed a retention depth of 3mm.Fracture resistance of composite resin basing onlays was higher than that of flow resin basing onlays,so composite resin should be preferred as onlays base material.

关 键 词：垫底材料 固位深度 高嵌体 抗折强度 

分 类 号：R783.3[医药卫生—口腔医学]