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首页> 外文期刊>The Journal of Prosthetic Dentistry >In vitro evaluation of fracture resistance and failure mode of internally restored endodontically treated maxillary incisors with differing heights of residual dentin.
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In vitro evaluation of fracture resistance and failure mode of internally restored endodontically treated maxillary incisors with differing heights of residual dentin.

机译：牙本质内部不同高度的牙髓内部修复的上颌切牙的抗断裂性和破坏模式的体外评估。

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STATEMENT OF PROBLEM: Some of the associated effects of different restorative systems placed in endodontically treated teeth with varying heights of residual dentin have yet to be examined in a comprehensive manner. There is a need for additional information regarding fracture resistance and mode of failure. PURPOSE: The purpose of this in vitro study was to evaluate the effect of 3 different restorative techniques with varying amounts of remaining dentin heights on the fracture resistance and failure mode of endodontically treated teeth. MATERIAL AND METHODS: Three groups of 40 human maxillary incisors were subdivided into 4 subgroups (n=10) with respect to the uniform height of the residual coronal dentin, defined as 0-, 2-, 4-, or 5-mm from the cemento-enamel junction, and then restored internally using a composite resin (Z100 MP) (control group), a cobalt-chromium ceramic alloy custom-made cast post and core (IPS d.SIGN 30; CCPC group), or a carbon fiber post system (Tech Xop 2000; CFP group). All specimens were then restored with nonprecious cast crowns. Static loading tests were performed on each specimen until failure (crack without a complete fracture). The data were analyzed with 2-way ANOVA and Bonferroni-corrected t test for independent samples (alpha=.05). Failure was classified as either favorable (allowing repair) or catastrophic (not allowing repair). RESULTS: The fracture resistance values (N) for the 0-, 2-, 4-, and 5-mm residual dentin heights were: 88, 143, 154, and 202 for the control group, 230, 264, 364, and 383 for the CCPC group, and 153, 235, 346, and 357 for the CFP group, respectively. Generally, all the differences tested were statistically significant. The failure mode was catastrophic for no control specimens, for 36 CCPC specimens, and for 4 CFP specimens. CONCLUSIONS: The highest and lowest fracture resistances were recorded for the CCPC and control groups, respectively, at each residual dentin height. An increased height of residual dentin generally provided greater fracture resistance. The fracture resistance of the CCPC group was, however, similar or only slightly higher than that of the CFP group when 2, 4, or 5 mm of residual dentin height was present. In contrast, the failure mode was favorable for almost all of the CFP and control groups, while it was catastrophic in most of the CCPC group.
机译：问题陈述：放置在具有不同高度的残留牙本质的牙髓治疗牙齿中的不同修复系统的一些相关影响尚待全面研究。需要有关抗断裂性和破坏模式的其他信息。目的：这项体外研究的目的是评估三种不同的修复技术以及不同数量的残留牙本质高度对牙髓治疗牙齿的抗断裂性和失败模式的影响。材料与方法：将三组40根人类上颌切牙相对于残留冠状牙本质的统一高度（分为距牙根0-，2-，4-或5-mm）细分为4个亚组（n = 10）。牙釉质交界处，然后使用复合树脂（Z100 MP）（对照组），钴铬陶瓷合金定制的铸造柱芯（IPS d.SIGN 30; CCPC组）或碳纤维进行内部修复邮寄系统（Tech Xop 2000; CFP集团）。然后用非贵重的铸冠修复所有标本。在每个样品上进行静态载荷测试，直到失效（没有完全断裂的裂纹）。使用2通ANOVA和Bonferroni校正的t检验分析独立样本的数据（alpha = .05）。失败被分类为有利（允许维修）或灾难性（不允许维修）。结果：0、2、4和5毫米残余牙本质高度的抗断裂强度（N）为：对照组为88、143、154和202，对照组为230、264、364和383 CCPC组分别为153、235、346和357（对于CFP组）。通常，测试的所有差异均具有统计学意义。对于没有对照的样本，对于36个CCPC样本和对于4个CFP样本，破坏模式是灾难性的。结论：在每个残余牙本质高度处，CCPC组和对照组分别记录了最高和最低的断裂阻力。残余牙本质的高度增加通常提供更大的抗断裂性。但是，当存在2、4或5 mm的残留牙本质高度时，CCPC组的抗断裂强度与CFP组相似或仅略高于CFP组。相比之下，故障模式对几乎所有CFP和对照组均有利，而在大多数CCPC组中则是灾难性的。

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