Mechanical stability of resin-dentin bond components
Mechanical stability of resin-dentin bond components
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DOI：
10.1016/j.dental.2004.06.001
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发表时间：
2005-03-01
期刊：
影响因子：
5
通讯作者：
Carvalho, RM
中科院分区：
文献类型：
--
作者：
Carrilho, MRD;Tay, FR;Carvalho, RM
目的：方法：将树脂复合体（Z250）和粘结剂系统（Single Bond-SB、One-Step-OS和Clearfil Liner Bond 2 V-CL）分别置于模具中，观察长期贮存对树脂-牙本质粘结剂的力学性能的影响。牙本质标本制备牙本质光盘从冠提取人磨牙。脱矿牙本质标本通过将牙本质盘在0.5mol/l EDTA（pH 7.0）中浸泡6天获得。牙本质和树脂基基质均成形为沙漏或I形梁样本，分别用于确定真实应力（TS）或表观弹性模量（E）。在蒸馏水中浸泡24小时后，以0.6 mm/min的速度对对照样本进行拉伸试验。实验样本在37 ℃下储存在蒸馏水或矿物油中，并在12个月后进行测试。结果：树脂基材料在水中贮存12个月后，TS和E均显著下降（p < 0.05），SB的TS除外（p > 0.05）;矿化牙本质标本在不同的储存条件下均无明显变化（p > 0.05）。脱矿牙本质在水中的储存对TS或E没有任何显著影响而脱矿牙本质在油中保存1年后，其TS和E值显著降低（p > 0.05）（p < 0.05）。显著性：储存时间和介质可能对树脂-牙本质粘结组分的机械性能有害，这最终会损害树脂-牙本质粘结的耐久性。(C)2004年牙科材料学院。由爱思唯尔有限公司出版。保留所有权利。
Objectives: To evaluate the effects of long-term storage on the mechanical properties of the components of resin-dentin bonds, that is, resin composite, adhesive system, demineralized and mineralized dentin.Methods: Specimens of resin composite (Z250) and adhesive systems (Single Bond-SB; One-Step-OS and Clearfil Liner Bond 2V-CL) were cast in molds. Dentin specimens were prepared from dentin discs obtained from the crowns of extracted human molars. Specimens of demineralized dentin were obtained by immersion of dentin discs for 6 days in 0.5 mol/l EDTA (pH 7.0). Both dentin and resin-based substrates were shaped to hourglass or I-beam specimens that were used to determine the true stress (TS) or apparent modulus of elasticity (E), respectively. Control specimens were subjected to tensile testing at 0.6 mm/min after 24 h of immersion in distilled water. Experimental specimens were stored at 37 degreesC in either distilled water or mineral oil and tested after 12 months. The data of each group were individually analyzed by ANOVA and Tukey's test.Results: Both TS and E of the resin-based materials decreased significantly after 12 months of storage in water (p < 0.05), except the TS of SB (p > 0.05). No changes were observed for specimens of mineralized dentin, regardless of storage condition (p > 0.05). Storage of demineralized dentin in water did not cause any significant effect in either TS or E (p > 0.05), however, significant reductions of TS and E of demineralized dentin occurred after storage in oil for 1 year (p < 0.05).Significance: Storage time and medium may be deleterious to the mechanical properties of the resin-dentin bond components, which ultimately could compromise the durability of resin-dentin bonds. (C) 2004 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.