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首页> 外文期刊>The Journal of Prosthetic Dentistry >Fatigue resistance of endodontically treated teeth restored with three dowel-and-core systems.
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Fatigue resistance of endodontically treated teeth restored with three dowel-and-core systems.

机译：用三个销钉和钉芯系统恢复了经牙髓治疗的牙齿的疲劳强度。

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STATEMENT OF PROBLEM: The successful restoration of endodontically treated teeth is enhanced by a crown design employing the ferrule effect. However, it is unclear which dowel-and-core system most effectively supports successful treatment. PURPOSE: The purpose of this study was to compare the load fatigue resistance of 3 dowel-and-core systems. MATERIAL AND METHODS: Fifteen endodontically treated maxillary central incisors were sectioned perpendicular to the long axis at a point 1.5 mm incisal to the cemento-enamel junction (CEJ). At the level of the CEJ, specimens were then prepared for crowns with 1-mm complete shoulder finish lines and 1.5 mm of axial wall height. The prepared teeth were divided into 3 groups (n=5) and restored with 1 of the following dowel-and-core combinations: Group CG, cast gold dowels and cores; Group TA, titanium alloy dowels (ParaPost XH) with composite cores; or Group FR, fiber-reinforced resin dowels (ParaPost FiberWhite) with composite cores. A dentin bonding agent (OptiBond Solo) was placed prior to the composite cores. Dowel-and-core castings and titanium alloy dowels were cemented with zinc phosphate cement. The fiber-reinforced dowels were cemented with a resin cement (ParaPost Cement). The crowns for all specimens were cast with an incisal notch for applying the fatigue load. The independent variable measured was the number of load fatigue cycles required to cause luting cement failure. The data were subjected to 1-way analysis of variance and the Student-Newman-Keuls test for 3 subsets (alpha=.05). RESULTS: The mean value+/-standard deviation for the cycles to failure for each group was: Group CG: 11,897+/-4080 load cycles, Group TA: 24,384+/-8231 load cycles, and Group FR: 50,696+/-7063 load cycles. Significant differences were found between all groups ( P<.05). CONCLUSIONS: Fiber-reinforced resin dowels and bonded composite cores under fatigue loading provided significantly stronger crown retention than cast gold dowels and cores and titanium alloy dowels with composite cores under fatigue loading.
机译：问题陈述：通过采用套圈效应的牙冠设计，可以增强牙髓治疗牙齿的成功修复。但是，目前尚不清楚哪种钉芯系统最有效地支持成功治疗。目的：本研究的目的是比较3个销钉和铁心系统的载荷疲劳强度。材料和方法：在与牙釉质-牙釉质交界处（CEJ）切入1.5 mm的点处，垂直于长轴切开15根牙髓治疗的上颌中切牙。然后在CEJ的水平上，准备具有1毫米完整肩部终点线和1.5毫米轴向壁高的牙冠的标本。将准备好的牙齿分为3组（n = 5），并用以下下列木钉和铁心组合之一进行修复：CG组，铸金木钉和铁心; TA组，带复合芯的钛合金定位销（ParaPost XH）;或FR组，纤维增强树脂销（ParaPost FiberWhite），带有复合芯。在复合芯之前放置牙本质粘合剂（OptiBond Solo）。销钉和型芯铸件以及钛合金销钉都用磷酸锌水泥固结。纤维增强的销钉用树脂水泥（ParaPost Cement）粘接。所有样品的冠部均铸造有切痕，以施加疲劳载荷。测得的独立变量是导致水泥渗出故障所需的载荷疲劳循环数。对数据进行1次方差分析和3个子集的Student-Newman-Keuls检验（alpha = .05）。结果：每组失效循环的平均值+/-标准偏差为：CG组：11,897 +/- 4080个载荷循环，TA组：24,384 +/- 8231个载荷循环，FR组：50,696 +/- 7063个加载周期。在所有组之间发现显着差异（P <.05）。结论：疲劳载荷下的纤维增强树脂定位销和粘结复合材料芯比疲劳载荷下的铸金定位销和具有复合芯的钛合金定位销具有更强的胎冠保持力。

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