Micromorphological changes in resin-dentin bonds after 1 year of water storage
Micromorphological changes in resin-dentin bonds after 1 year of water storage
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DOI：
10.1002/jbm.10208
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发表时间：
2002-06-05
期刊：
影响因子：
--
通讯作者：
Kubota, M
中科院分区：
文献类型：
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作者：
Hashimoto, M;Ohno, H;Kubota, M
本研究的目的是评估树脂-牙本质键在水储存一年后的降解。采用粘接树脂系统（一步式：Bisco）制备树脂-牙本质粘合试样。将一半的实验试样垂直于粘接界面切成一束（粘接面积：0.9 mm(2)），在37℃蒸馏水中保存1年。其余一半的粘结试件在蓄水1年后被分割成类似尺寸的梁。在截面成梁之前在水中储存24小时的附加粘结试样作为对照。两个实验组和对照组的梁进行微拉伸粘结试验。用FE-SEM对断裂梁进行断口分析。对照组（55.9 +/- 12.9 MPa）、蓄水后分段梁组（68.9 +/- 18.6 MPa）和蓄水前分段梁组（28.1 +/- 9.3 MPa）的粘结强度差异有统计学意义（p < 0.05）。断口形貌显示，树脂材料逐渐从梁的外围向中心部分提取。这可能是水贮存1年后粘结强度下降的原因。(C) 2002 Wiley期刊有限公司
The purpose of this study was to evaluate the degradation of resin-dentin bonds after I year of water storage. Resin-dentin-bonded specimens were prepared with the use of an adhesive resin system (One-Step: Bisco). Half of the experimental specimens were sectioned perpendicular to the adhesive interface to produce a beam (adhesive area: 0.9 mm(2)) before being stored in distilled water at 37 degreesC for 1 year. The remaining half of the bonded specimens were sectioned into beams of similar dimensions after I year of water storage. Additional bonded specimens that had been stored in water for 24 h before sectioning into beams were used as controls. The beams in the two experimental groups and the control group were subjected to microtensile bond testing. Fractography was performed on all fractured beams with the use of FE-SEM. There were significant (p < .05) differences in bond strength among the control specimens (55.9 +/- 12.9 MPa), specimens that had been sectioned into beams after water storage (68.9 +/- 18.6 MPa), and specimens that had been sectioned into beams before water storage (28.1 +/- 9.3 MPa). Fractography revealed that the resin material was gradually extracted from the periphery to the center portion of the beam. This probably accounted for the decrease in bond strength after 1 year of water storage. (C) 2002 Wiley Periodicals, Inc.