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. 2014 Apr;32(2):157-61.
doi: 10.7518/hxkq.2014.02.012.

[Effects of Different Tooth Preparations on the Fracture Behavior of Teeth With Severe Wedge-Shaped Defect Restored With Post and Core Crowns]

[Article in Chinese]
Free PMC article

[Effects of Different Tooth Preparations on the Fracture Behavior of Teeth With Severe Wedge-Shaped Defect Restored With Post and Core Crowns]

[Article in Chinese]
Dandan Feng et al. Hua Xi Kou Qiang Yi Xue Za Zhi. .
Free PMC article

Abstract

Objective: This study aimed to investigate the effects of different tooth preparations on the fracture strength and pattern of failure of teeth with severe wedge-shaped defect restored with post and core crowns.

Methods: According to whether the teeth above the wedge-shaped defect was removed (represented by B) or not (represented by A), the ferrule next to the wedge-shaped defect was prepared (represented by D) or not (represented by C), the cast post-and-core was chosen (represented by E) or glass-fiber post and resin core was chosen (represented by F). A total of 64 human mandibular premolar teeth were randomly divided into 8 groups: 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), each group 8 teeth. All the teeth were prepared and restored accordingly and then mounted on an electronic pressure universal testing machine. The maximum fracture strength and the patterns of failure were recorded.

Results: 1) The fracture strength of Group A1-1 > that of Group B1-1, Group A1-2 > Group B1-2, Group B2-1 > Group B1-1, and Group B2-1 > Group B2-2 with significant differences (P < 0.05). 2) The patterns of repairable fracture in Group A1-2 and B1-2 were both 37.5%, and that of the other groups were 0. Furthermore, the difference was significant, and Group A1-2 and B1-2 were higher than other groups.

Conclusion: The maintenance of the overhang above the severe wedge-shaped defect aid in the improvement of the fracture strength of the tooth restored with post and core crown. The ferrule of the wedge-shaped defect is not recommended to be prepared. Furthermore, the glass-fiber post and resin core is favorable for the re-repair of the teeth than the cast post and core.

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formula image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(P<0.05)。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。

Figures

图 1
图 1. 64颗样本牙的分组情况
Fig 1 Grouping of 64 teeth
图 2
图 2. A、B组牙体预备后形态示意图
Fig 2 Morphology of group A and B after preparation A:A1组;B:A2组;C:B1组;D:B2组。
图 3
图 3. 重度楔状缺损模型的建立
Fig 3 Model of severe wedeg-shaped defect teeth A、B:定点;C:楔状缺损正面观;D:楔状缺损侧面观。
图 4
图 4. 牙冠阴模的制作
Fig 4 Making of dental crown cavity die 左:制取牙冠阴模;右:制作完成。

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