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首页> 外文期刊>The Journal of Prosthetic Dentistry >Effect of dentin bonding and ferrule preparation on the fracture strength of crowned teeth restored with dowels and amalgam cores.
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Effect of dentin bonding and ferrule preparation on the fracture strength of crowned teeth restored with dowels and amalgam cores.

机译：牙本质粘结和金属箍的制备对用销钉和汞齐核修复的冠状牙齿的断裂强度的影响。

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STATEMENT OF PROBLEM: It is necessary to obtain an adequate bond at the core/dentin junction where the majority of failures occur. The effect of recently developed dentin bonding agents on the fracture resistance of endodontically treated teeth at the amalgam core/dentin junction is unclear. PURPOSE: The purpose of this study was to evaluate the effects of 2 dentin bonding agents and a ferrule preparation on the fracture resistance of crowned mandibular premolars incorporating prefabricated dowel and silver amalgam cores. MATERIAL AND METHODS: Sixty extracted mandibular second premolars were divided into 6 groups of 10 each. The coronal portion of each tooth was removed at the cemento-enamel junction (CEJ) in the first 3 groups. In the other groups, teeth were sectioned 1 mm above the CEJ to create a ferrule. After root canal preparations, prefabricated dowels (ParaPost) were placed. The first group served as a control and was tested without application of bonding agents and without incorporation of a ferrule design. In the second and third groups, respectively, an autopolymerizing adhesive (Superbond D-Liner) and a dual-polymerizing adhesive (Panavia F) were applied to tooth surfaces before restorative procedures. For the fourth (ferrule) group, no bonding agent was applied, but a 1-mm ferrule preparation was used. In the fifth (ferrule+D-Liner) and sixth (ferrule+Panavia F) groups, respectively, autopolymerizing and dual-polymerizing bonding agents were used in conjunction with the ferrule preparation. After amalgam core fabrication, Ni-Cr full cast crowns for each group were prepared and cemented. All specimens were stored in water for 1 week and thermal cycled 1000 times between 5 degrees and 55 degrees C. A compressive shear load was applied at an angle of 135 degrees to the crown, and the maximum load at fracture (N) was recorded. The data were analyzed with 1-way ANOVA and Tukey Honestly Significant Difference tests (alpha=.05). RESULTS: Significantly higher fracture strength values were demonstrated for the ferrule+Panavia F (652.5 N), ferrule+D-liner (649.1 N) and ferrule (592.4 N) groups, respectively, than for the other groups. The next highest fracture strength values were found for the D-Liner (485.0 N) and Panavia F (486.3 N) groups. The control group (376.6 N) demonstrated the lowest fracture strength in all test groups (P<.001). CONCLUSION: A ferrule preparation or a bonding agent designed for silver amalgam core-dentin bonding can each increase the fracture strength for teeth receiving cast crowns after endodontic therapy and dowel and amalgam core restorations.
机译：问题陈述：有必要在发生大多数故障的核心/牙本质连接处获得足够的结合力。尚不清楚最近开发的牙本质粘合剂对在汞齐核心/牙本质连接处进行牙髓治疗的牙齿的抗断裂性的影响。目的：本研究的目的是评估两种牙本质粘合剂和套圈制剂对结合了预制销钉和银汞齐芯的下颌前磨牙的抗断裂性的影响。材料与方法：将60颗提取的下颌第二前磨牙分为6组，每组10个。在前三组中，在牙釉质交界处（CEJ）去除了每个牙齿的冠状部分。在其他组中，将牙齿从CEJ上方切开1毫米以形成套圈。准备根管后，放置预制销钉（ParaPost）。第一组用作对照，并在不使用粘合剂和不引入套圈设计的情况下进行了测试。在第二组和第三组中，在修复程序之前，将自聚合粘合剂（Superbond D-Liner）和双聚合粘合剂（Panavia F）应用到牙齿表面。对于第四组（插芯），未使用粘合剂，但使用了1毫米插芯的制备方法。在第五组（套圈+ D-Liner）和第六组（套圈+ Panavia F）中，自聚合和双聚合结合剂与套圈制剂一起使用。汞合金芯制造完成后，准​​备并粘合每组镍铬全铸冠。将所有样品在水中储存1周，并在5摄氏度至55摄氏度之间进行1000次热循环。以相对于胎冠135度的角度施加压缩剪切载荷，并记录断裂时的最大载荷（N）。使用1向ANOVA和Tukey诚实显着差异检验（alpha = .05）分析数据。结果：套圈+ Panavia F（652.5 N），套圈+ D-内衬（649.1 N）和套圈（592.4 N）组的断裂强度值均显着高于其他组。发现D-Liner（485.0 N）和Panavia F（486.3 N）组的下一个最高断裂强度值。对照组（376.6 N）在所有测试组中均表现出最低的断裂强度（P <.001）。结论：经过牙髓治疗和销钉和汞齐芯修复后，用于银汞齐芯-牙本质键合的套圈制剂或粘合剂可分别提高接受铸造牙冠的牙齿的断裂强度。

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