不同牙体预备方法对模拟重度楔状缺损牙体桩核冠修复后抗折特性的影响

发布时间：2018-04-11 19:18

本文选题：楔状缺损 + 悬突牙体　；参考：《华西口腔医学杂志》2014年02期

【摘要】：目的探讨不同牙体预备方法对重度楔状缺损牙体桩核冠修复后抗折特性的影响,为临床修复治疗提供理论依据。方法将64颗离体下颌第一前磨牙按不同的牙体预备和修复方法分组,按照颊侧楔状缺损方悬突牙体去除与否(不去为A,去除为B)和颊侧楔状缺损下方是否制备牙本质肩领(未制备为C,制备为D),以及铸造桩核修复(设为E)或纤维桩核修复(设为F)随机分为A1-1(A+C+E)、A1-2(A+C+F)、A2-1(A+D+E)、A2-2(A+D+F)、B1-1(B+C+E)、B1-2(B+C+F)、B2-1(B+D+E)、B2-2(B+D+F)共8组,每组8颗,建立重度楔状缺损牙模型,各组按分组内容进行桩核冠修复,用电子万能试验机进行加载,测试各组的抗折载荷,观察折裂模式。结果 1)抗折载荷的比较:A1-1组B1-1组,A1-2组B1-2组,B2-1组B1-1组,B2-1组B2-2组,其差异均有统计学意义(P0.05)。2)A1-2、B1-2组可修复性折裂比例均为37.5%,其余各组均为0,A1-2组和B1-2组明显高于其他组。结论重度楔状缺损患牙桩核冠修复时保留颊侧悬突牙体对承受抗折载荷有利,修复时不建议颊侧设计牙本质肩领;纤维桩较铸造桩更有利于牙体折裂后的再修复。
[Abstract]:Objective to investigate the effect of different methods of tooth preparation on the fracture resistance after post and core crown repair of severe wedge-shaped defects and to provide theoretical basis for clinical treatment.Methods 64 mandibular first premolars were divided into two groups according to different methods of tooth preparation and restoration.Dentine shoulder collar (not prepared as C, prepared for Dot), and cast post core (E-based) or fiber post for restoration of dentine shoulder collar under buccal wedge-shaped defect according to whether the tooth is removed (not A, removed as B) and below the buccal wedge-shaped defect (not prepared as C, prepared as DU), and cast post core repair (set as E) or fibrous post.Eight teeth with severe wedge-shaped defect were established in each group. Each group was repaired with post and core crown according to the contents of each group, and loaded with electronic universal testing machine. The fracture mode was observed and tested under the bending load of each group.Conclusion the retention of buccal suspensions in the repair of severe wedge-shaped defects is beneficial to bear the bending load, and it is not recommended to design dentin shoulder collar on the buccal side, and the fiber post is more favorable than the cast post to rerepair the fractured tooth.
【作者单位】：山东大学口腔医院修复科;山东省口腔生物医学重点实验室;
【分类号】：R783.3

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