Effects of different artificial ageing methods on the degradation of adhesive-dentine interfaces
Effects of different artificial ageing methods on the degradation of adhesive-dentine interfaces
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不同人工时效方法对粘接剂-牙本质界面降解的影响
DOI：
10.1016/j.jdent.2014.09.010
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发表时间：
2014-12-01
影响因子：
4.4
通讯作者：
Huang, Cui
中科院分区：
文献类型：
--
作者：
Deng, Donglai;Yang, Hongye;Huang, Cui
目的：比较四种常用的人工老化方法（水储存、热循环、NaOCl储存和pH循环）对粘接剂-牙本质界面降解的影响。方法：将50颗磨牙平行于咬合面切开，抛光后随机分为两组：蚀刻-冲洗胶粘剂Adper SingleBond 2组和自蚀刻胶粘剂G-Bond组。复合材料构建完成后，将各粘接组的试件切片成梁，然后将其分配到以下组中：1组（对照组），蓄水24 h；第2组，储水6个月；第三组，10000次热循环；第4组，10% NaOCl储存1 h；第5组进行15次pH循环。然后测试微拉伸粘结强度。用体视显微镜对其失效模式进行了分类，并用场发射扫描电镜对具有代表性的界面进行了分析。通过FESEM在后向散射模式下评价纳米泄漏的表达。结果：与对照处理相比，四种人工老化方法使两种胶粘剂体系的粘接强度降低至近50%，并增加了纳米渗漏表达。粘接失败是所有组中主要的骨折模式。然而，在不同组之间观察到详细形态学的差异。结论：储水、热循环、NaOCl储存和pH循环可通过适当的参数选择获得相似的降解效果。每种体外人工老化方法对牙本质-粘接剂界面降解都有各自的机理、特点和适用范围。临床意义：储水方法简单，成本低，但耗时长；热循环缺乏一个标准的协议；NaOCl储存节省时间，但主要降解有机相；pH循环可能与龋齿相似，但需要进一步研究。粘接耐久性研究人员应根据试验材料、试验目的和试验时间的不同，慎重选择合适的老化模型。(C) 2014 Elsevier Ltd.版权所有。
Objectives: To compare the effects of four commonly used artificial ageing methods (water storage, thermocycling, NaOCl storage and pH cycling) on the degradation of adhesive-dentine interfaces.Methods: Fifty molars were sectioned parallel to the occlusal plane, polished and randomly divided into two adhesive groups: An etch-and-rinse adhesive Adper SingleBond 2 and a self-etch adhesive G-Bond. After the composite built up, the specimens from each adhesive group were sectioned into beams, which were then assigned to one of the following groups: Group 1 (control), 24 h of water storage; Group 2, 6 months of water storage; Group 3, 10,000 runs of thermocycling; Group 4, 1 h of 10% NaOCl storage; and Group 5, 15 runs of pH cycling. The microtensile bond strengths were then tested. The failure modes were classified with a stereomicroscope and representative interface was analyzed with a field-emission scanning electron microscopy (FESEM). Nanoleakage expression was evaluated through FESEM in the backscattered mode.Results: The four artificial ageing methods decreased the bonding strength to nearly 50% and increased the nanoleakage expression of both adhesive systems compared with the control treatment. Adhesive failures were the predominant fracture modes in all groups. However, differences in detailed morphology were observed among the different groups.Conclusions: Water storage, thermocycling, NaOCl storage and pH cycling could obtain similar degradation effectiveness through appropriate parameter selection. Each in vitro artificial ageing method had its own mechanisms, characteristics and application scope for degrading the adhesive-dentin interfaces.Clinical significance: Water storage is simple, low-cost but time-consuming; thermocycling lacks of a standard agreement; NaOCl storage is time-saving but mainly degrades the organic phase; pH cycling can resemble cariogenic condition but needs further studies. Researchers focusing on bonding durability studies should be deliberate in selecting an appropriate ageing model based on the differences of test material, purpose and time. (C) 2014 Elsevier Ltd. All rights reserved.