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首页> 外文期刊>Journal of prosthodontics: official journal of the American College of Prosthodontists >Effect of Fabrication Technique and Thermal Cycling on the Bond Strength of CAD/CAM Milled Custom Fit Anatomical Post and Cores: An In Vitro In Vitro Study
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Effect of Fabrication Technique and Thermal Cycling on the Bond Strength of CAD/CAM Milled Custom Fit Anatomical Post and Cores: An In Vitro In Vitro Study

机译：制造技术和热循环对CAD / CAM磨床定制解剖岗位和核心的粘接强度的影响：体外研究

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Abstract Purpose This study is to investigate the effect of milling custom fit anatomical post and cores from fiber reinforced composite and high‐density polymer blocks using CAD/CAM technology on the bond strength to root canal dentin compared with prefabricated fiber posts, and to evaluate the influence of thermal cycling on the push out bond strength of the tested materials. Materials and Methods Eighty extracted single‐rooted premolars, endodontically treated and prepared to receive the posts, were randomly divided into four groups (n = 20): BLC: Custom‐milled fiber‐reinforced composite posts and cores (Trilor, Bioloren), AMC: Custom‐milled high‐density polymer posts and cores (Ambarino, Creamed), BLP: Prefabricated fiber‐reinforced composite posts and composite core buildups (Bioloren; Filtek Bulk Fill Posterior, 3M). The posts used have the same matrix and fiber composition as BLC, RXP: Prefabricated posts and composite core buildups (RelyX fiber post, 3M; Filtek Bulk Fill Posterior); used as a control group. All of the posts were cemented using a self‐adhesive resin cement (RelyX U200, 3M). Half of the sample was randomly assigned to thermal cycling in distilled water for 6,000 cycles to simulate aging, while the other half was tested for bond strength without thermal cycling. A push‐out test was conducted using a universal testing machine until failure. Bond strength values were calculated in megapascals (MPa). The mode of failure was observed using a stereo microscope. Results were analyzed by two‐way ANOVA followed by a Bonferroni post hoc test for comparison. The level of significance was set at p 0.05. Results Push‐out bond strength was significantly higher ( p ?0.001) in the CAD/CAM post groups than in the groups with prefabricated posts regardless of the post material, while aging of the teeth did not significantly affect the push‐out strength ( p = 0.536). Failures were adhesive between cement and dentin for all groups except for AMC, where adhesive failure between the cement and the post was also observed. Conclusion The CAD/CAM manufacturing technique was proved to ameliorate the retention of the post and cores in the root canal. Thermal cycling did not affect the bond strength of the tested groups.
机译：摘要目的本研究是研究使用CAD / CAM技术在粘合强度与预制纤维柱的粘合强度上的纤维增强复合材料和高密度聚合物块的影响，并评估热循环对试验材料推出键强度的影响。材料和方法80份提取的单生磨牙，脊髓性处理并准备接收柱，被随机分为四组（n = 20）：BLC：定制铣削纤维增强复合柱和核（Trilor，Bioloren），AMC ：定制的高密度聚合物柱和核心（Ambarino，Creaked），BLP：预制纤维增强复合柱和复合核心堆积（Bioloren; Filtek Bulk填充后，3M）。使用的帖子具有与BLC，RXP：预制帖子和复合核心累积（梯形纤维柱，3M; Filtek Bulk填充后）的帖子。用作对照组。使用自粘树脂水泥（梯形U200,3M）巩固所有柱子。将一半的样品随机分配给蒸馏水中的热循环6,000次循环以模拟老化，而另一半在没有热循环的情况下测试粘合强度。使用通用测试机进行推出测试，直到失败。粘合强度值以兆帕斯卡（MPA）计算。使用立体显微镜观察失败模式。通过双向ANOVA分析结果，然后进行Bonferroni后HOC测试进行比较。在P＆LT; 0.05。结果推出粘合强度在CAD / CAM后组中显着高于（p？<0.001），而不是在具有预制柱的组中，无论后置物质，牙齿老化都没有显着影响推出强度（p = 0.536）。除了AMC之外的所有基团的水泥和牙本质之间的故障是粘附的，其中还观察到水泥和柱之间的粘合剂失效。结论证明了CAD / CAM制造技术改善了根管中的柱子和核心的保留。热循环不影响测试组的粘合强度。

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