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复合材料修复的弯曲、径向拉伸和剪切粘结强度评估。

Evaluation of flexural, diametral tensile, and shear bond strength of composite repairs.

作者信息

Imbery T A, Gray T, DeLatour F, Boxx C, Best A M, Moon P C

出版信息

Oper Dent. 2014 Nov-Dec;39(6):E250-60. doi: 10.2341/13-299-L. Epub 2014 Aug 1.

Abstract

OBJECTIVE

Repairing composite restorations may be a more conservative treatment than replacing the entire restoration. The objective of this in vitro study was to determine the best repair method by measuring flexural, diametral tensile, and shear bond strength of repaired composites in which the surfaces were treated with chemical primers (Add & Bond or Silane Bond Enhancer), a bonding agent (Optibond Solo Plus [OBSP]), or mechanical retention with a bonding agent.

METHODS

Filtek Supreme Ultra shade B1B was placed in special molds to fabricate specimens that served to test the flexural, diametral tensile, or shear strength of the inherent resin substrate. The same molds were modified to make specimens for testing repair strength of the resin. Repairs were made immediately or after aging in deionized water at 37°C for seven days. All repair sites were finished with coarse Sof-Lex discs to simulate finishing new restorations or partially removing aged restorations. Repair surfaces were treated with one of the following: 1) phosphoric-acid etching and OBSP; 2) Add & Bond; 3) phosphoric-acid etching, Silane Bond Enhancer, and OBSP; or 4) quarter round bur, phosphoric-acid etching, and OBSP. Specimens were placed back in the original molds to fabricate specimens for diametral tensile or flexural testing or in an Ultradent jig to make specimens for shear bond testing. Composite resin in shade B5B was polymerized against the treated surfaces to make repairs. Two negative control groups for the three testing methods consisted of specimens in which repairs were made immediately or after aging without any surface treatments. Controls and experimental repairs were aged (water 37°C, 24 hours) before flexural, diametral tensile, or shear testing in an Instron Universal testing machine at a crosshead speed of 0.5 mm/min.

RESULTS

Experimental flexural repair strengths ranged from 26.4% to 88.6% of the inherent substrate strength. Diametral tensile repair strengths ranged from 40% to 80% of the inherent substrate strength, and shear bond strength repairs ranged from 56% to 102%. Geometric means were statistically analyzed with two-way analysis of variance on their log-transformed values. Significant differences were determined using Tukey honestly significant difference (p<0.05).

CONCLUSIONS

Depending on the mechanical property being tested, surface treatments produced different results. OBSP produced more consistent results than chemical primers.

摘要

目的

修复复合树脂修复体可能比替换整个修复体是一种更保守的治疗方法。本体外研究的目的是通过测量经化学底漆(添加型粘结剂或硅烷粘结增强剂)、粘结剂(Optibond Solo Plus [OBSP])处理表面的修复复合树脂的挠曲强度、径向拉伸强度和剪切粘结强度,来确定最佳修复方法,或者是使用粘结剂进行机械固位的情况。

方法

将Filtek Supreme Ultra色号B1B的材料放入特殊模具中制作标本,用于测试固有树脂基质的挠曲强度、径向拉伸强度或剪切强度。对相同模具进行修改以制作用于测试树脂修复强度的标本。修复立即进行,或在37°C去离子水中老化7天后进行。所有修复部位均用粗粒度的Sof-Lex圆盘进行修整,以模拟修整新修复体或部分去除老化修复体的情况。修复表面用以下方法之一进行处理:1)磷酸蚀刻和OBSP;2)添加型粘结剂;3)磷酸蚀刻、硅烷粘结增强剂和OBSP;或4)四分之一圆头车针、磷酸蚀刻和OBSP。将标本放回原始模具中制作用于径向拉伸或挠曲测试的标本,或放入Ultradent夹具中制作用于剪切粘结测试的标本。将B5B色号的复合树脂聚合在处理过的表面上进行修复。三种测试方法的两个阴性对照组由立即修复或老化后未进行任何表面处理的标本组成。在Instron万能试验机上,以0.5 mm/min的十字头速度对对照组和实验性修复体进行挠曲、径向拉伸或剪切测试前,先进行老化处理(37°C水,24小时)。

结果

实验性挠曲修复强度为固有基质强度的26.4%至88.6%。径向拉伸修复强度为固有基质强度的40%至80%,剪切粘结强度修复范围为56%至102%。对几何平均值的对数转换值进行双向方差分析进行统计分析。使用Tukey真实显著差异法确定显著差异(p<0.05)。

结论

根据所测试的力学性能,表面处理产生了不同的结果。OBSP产生的结果比化学底漆更一致。

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