摘要
Abstract
Objective To compare the clinical effects of the residual crown and root restoration with the posts and cores of two materials to provide evidence for the choice of the right material in clinical treatment. Methods 48 male and 40 female patients with 88 residual crowns of carious upper incisors were included in the study.The tooth crowns were similar in condition and all above the gingival margin.They were randomly divided into two groups of 44 cases,restored using porcelain-veneered crowns with cast metal and glass fiber-reinforced posts and cores respectively.The long-term restoration effects were evaluated. Results The reexamination six years later of the 36 cases restored with cast metal posts and cores showed 27 crowns functioned well and 9 came off with varied root fracture.The reexamination of 38 cases restored with glass fiber-reinforced posts and cores revealed 36 crowns were in good shape and functioned well,and another 2 had broken glass fiber-reinforced posts.None of them reported root loosening or fracture.The restoration success rates of the two groups were 75% and 94.7%,respectively.Their difference had statistic significance(P<0.05). Conclusion The failure of the cast metal group consists mainly in the root fracture,while the failure of the glass fiber-reinforced group in the post breakage.The root fracture is irreparable whereas the post breakage leaves a chance for second restoration.So,glass fiber reinforced posts and cores have a higher clinical value than those cast metal ones.关键词
烤瓷冠/桩核/根折/二次修复Key words
porcelain-veneered crown/post and core/root fracture/second restoration分类
医药卫生
