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首页> 外文期刊>The Journal of Prosthetic Dentistry >Effect of screw-access hole and mechanical cycling on fracture load of 3-unit implant-supported fixed dental prostheses
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Effect of screw-access hole and mechanical cycling on fracture load of 3-unit implant-supported fixed dental prostheses

机译：螺杆进入孔的影响和机械循环对3单元植入式固定牙科假体的断裂载荷

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Abstract Statement of problem The effect of screw-access holes and mechanical cycling on fracture resistance of 3-unit screw-retained zirconia-based implant-supported fixed dental prostheses (ISFDPs) is unknown. Purpose The purpose of this in?vitro study was to evaluate the effect of screw-access holes on the maximum fracture load (L f ) of 3-unit ISFDPs fabricated with the same abutment design for screw (s)-retained and cement (c)-retained with either a metal- or zirconia-based framework, testing the hypotheses that ISFDPs with screw-access holes have the lowest L f and that mechanical cycling decreases the L f of screw-retained ISFDPs. Material and methods Models with fiberglass bases with 2 implants were fabricated. Special abutments were designed to allow for both s- and c-retained ISFDPs. The study considered the type of framework (s-retained metal-based and s-retained zirconia-based), fixation (s and c), and aging (a) with mechanical cycling, resulting in the following experimental groups (n=12): c-retained metal-based ISFDP; s-retained metal-based ISFDP (Ms); s-retained zirconia-based ISFDP aged by mechanical cycling (Zsa); and s-retained metal-based ISFDP aged by mechanical cycling (Msa). All ISFDPs were porcelain veneered and subjected to compressive load to failure. Fracture load data were statistically analyzed using 1-way ANOVA and Tukey range tests (α=.05). Fractography was used to evaluate the fracture surfaces. Results Cement-retained ISFDP (Zc and Mc) showed the greatest L f values ( P f values than those for Ms. Aging significantly decreased the L f of Zsa but had no effect on Msa. Chipping was the failure mode most frequently found. Only Zs and Zsa ISFDPs showed catastrophic failures. Conclusions ISFDPs with screw-access holes showed lower L f values, regardless of the framework type. Mechanical cycling affected the L f of screw-retained zirconia-based ISFDPs.
机译：摘要问题陈述螺旋通道孔的效果和机械循环对3单元螺旋保留氧化锆的植入式植入式牙科假体（ISFDP）的裂缝电阻是未知的。目的在体外研究中的目的是评估螺旋入口孔对用相同的螺旋设计制造的3单元ISFDP的最大断裂载荷（L F）的效果，用于螺钉和水泥（C） ）用基于金属或氧化锆的框架进行测试，测试具有螺杆通道孔的ISFDP的假设具有最低的L F，并且机械循环降低了螺杆保留的ISFDP的L F.制造具有2种植体的玻璃纤维碱的材料和方法模型。特殊基台旨在允许S-和C保留的ISFDPS。该研究认为，具有机械循环的框架类型（S-RETINE的金属基和S-RETINAL氧化锆基），固定（S和C）和老化（A），导致以下实验组（n = 12） ：C保留金属基ISFDP; S保留金属基ISFDP（MS）;由机械循环（ZSA）为基础基于氧化锆的ISFDP;通过机械循环（MSA）老化的S-保留的金属基ISFDP。所有ISFDP都是瓷肢体，并经受压缩载荷失效。使用单向ANOVA和TUKEY范围测试（α= .05）统计分析骨折载荷数据。 Fractography用于评估裂缝表面。结果水泥保留的ISFDP（ZC和MC）显示了最大的L F值（P f值比老化女士的值显着降低了ZSA的L F，但对MSA没有影响。削减是最常见的失败模式。只ZS和ZSA ISFDP显示出灾难性的失败。结论ISFDPS具有螺旋通入孔的ISFDP显示出L低值，无论框架类型如何。机械循环影响了螺钉保留的基于氧化锆的ISFDP的L F.

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