Influence of ascorbic acid on bonding of peroxide-affected dentin and 4-META/MMA-TBB resin
Influence of ascorbic acid on bonding of peroxide-affected dentin and 4-META/MMA-TBB resin
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DOI：
10.1007/s00784-006-0071-2
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发表时间：
2006-12-01
影响因子：
3.4
通讯作者：
Sato, T.
中科院分区：
文献类型：
--
作者：
Nomoto, S.;Kameyama, A.;Sato, T.
本研究的目的是评估过氧化物暴露牙本质的拉伸粘结强度（TBS）。此外，抗坏血酸（AA）对过氧化氢暴露的牙本质粘结强度的影响进行了研究。将提取的牛牙本质暴露于10%过氧化脲、30%过氧化氢或蒸馏水30 min，然后用10% AA处理（0、30、90和180 min），并用10%柠檬酸/3%氯化铁调节。用4-Meta/MMA-TBB树脂将聚甲基丙烯酸甲酯（PMMA）棒粘结到处理过的牛牙本质上。由这些粘结组件制备微型哑铃形粘结试样，并测试TBS。用扫描电子显微镜观察了断裂表面。粘合前暴露于过氧化物会显著降低粘合强度。AA对过氧化物暴露的牙本质的应用增加了粘结强度。另一方面，在蒸馏水影响的牙本质中发现AA的不利影响。过氧化物暴露的牙本质中部分可见延伸的树脂纤维。总之，过氧化物降低了结合强度，并且氧化越强，所获得的结合越弱。AA的抗氧化作用使粘结强度恢复，且AA使用时间越长，这种作用越强。
The purpose of this study was to evaluate the tensile bond strength (TBS) to peroxide-exposed dentin. Furthermore, the effect of ascorbic acid (AA) on the bond strength of peroxide-exposed dentin was investigated. Extracted bovine dentin was exposed to 10% carbamide peroxide, 30% hydrogen peroxide, or distilled water for 30 min, then treated with 10% AA (0, 30, 90, and 180 min), and conditioned with 10% citric acid/3% ferric chloride. The polymethyl-methacrylate (PMMA) rod was bonded to the treated bovine dentin with 4-META/MMA-TBB resin. A minidumbbell-shaped bonded specimen was prepared from these bonded assemblies and the TBS was tested. The fractured surfaces were also observed with a scanning electron microscope. Exposure to peroxide before bonding significantly reduced bond strength. The application of AA to the peroxide-exposed dentin increased bond strength. On the other hand, an adverse effect of AA was found in distilled water-affected dentin. Extended resin fibers were partially seen in the peroxide-exposed dentin. In conclusion, peroxide reduced the bond strength, and the stronger the oxidation, the weaker the obtained bond. Antioxidation with AA recovered the bond strength, and this effect increased the longer the AA was applied.