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目的:比较上颌中切牙切角缺损,不同预备宽度微创铸瓷贴面修复的抗折强度和破坏模式。方法:收集离体上颌中切牙21颗,随机均分为3组,分别在唇侧缺损边缘行宽度为1 mm、2 mm、4 mm的牙体预备,预备深度均为0.5 mm,浅凹形边缘,并行IPS e.max Press铸瓷贴面修复。粘固于离体牙上,万能测力机测试抗折强度并在体视显微镜下观察断裂模式。结果:缺损边缘预备宽度1 mm、2 mm、4 mm组微创铸瓷贴面复合体的抗折强度均值分别为(227.31±31.4)N、(315.21±19.3)N、(368.25±33.9)N,其中4 mm宽度预备组抗折强度力值大于1 mm和2 mm宽度预备组,差异均有统计学意义(P<0.05),2 mm组的抗折强度大于1 mm组,但差异无统计学意义(P>0.05);微创铸瓷贴面复合体主要的破坏模式为粘接面脱落(38.10%)和混合破坏(38.10%)。结论:预备宽度越大微创铸瓷贴面修复后抗折强度越大。
OBJECTIVE: To compare the flexural strength and failure modes of maxillary incisor incisors with different prepared widths for minimally invasive porcelain veneer repair. Methods: Twenty-one maxillary central incisors were collected and divided into three groups randomly. The width of the defect was 1 mm, 2 mm and 4 mm respectively. The prepared depth was 0.5 mm, Shape Edge, Parallel IPS e.max Press Porcelain Veneer Repair. Cling to isolated teeth, universal force test flexural strength and observed under a stereomicroscope fracture mode. Results: The mean values of flexural strength of minimally invasive porcelain veneers with widths of 1 mm, 2 mm and 4 mm were (227.31 ± 31.4) N, (315.21 ± 19.3) N and (368.25 ± 33.9) N , And the difference between the 4 mm width preparation group and the 2 mm width preparation group was larger than that of the 1 mm and 2 mm width preparation groups (P <0.05). The flexural strength of the 2 mm group was larger than that of the 1 mm group, but the difference was not statistically significant (P> 0.05). The main failure mode of the minimally invasive porcelain veneer complex was the adhesive surface detachment (38.10%) and the mixed destruction (38.10%). Conclusion: The larger the width of the prepared micro-invasive ceramic veneer repair the greater the flexural strength.