Kento Sato, K. Hosaka, Masahiro Takahashi, M. Ikeda, F. Tian, W. Komada, M. Nakajima, R. Foxton, Y. Nishitani, D. Pashley, J. Tagami
{"title":"Dentin Bonding Durability of Two-step Self-etch Adhesives with Improved of Degree of Conversion of Adhesive Resins.","authors":"Kento Sato, K. Hosaka, Masahiro Takahashi, M. Ikeda, F. Tian, W. Komada, M. Nakajima, R. Foxton, Y. Nishitani, D. Pashley, J. Tagami","doi":"10.3290/j.jad.a37726","DOIUrl":null,"url":null,"abstract":"PURPOSE To evaluate (1) the initial and long-term microtensile bond strengths of two-step self-etch adhesives with different degrees of conversion (DC); (2) the elastic modulus of the respective adhesive resins; (3) the water sorption of the respective adhesive resins. MATERIALS AND METHODS Two two-step self-etch adhesives, Clearfil SE Bond (CSE) and Clearfil SE Bond 2 (CSE2) were used in this study. The DC was determined using ATR/FT-IR with a time-based spectrum analysis. Midcoronal flat dentin surfaces of 24 human molars were prepared with 600-grit SiC paper for microtensile bond strength (µTBS) testing. CSE and CSE2 were applied to the dentin surfaces according to the manufacturer's instructions, followed by composite buildups. The µTBS was measured after water storage for 24 h, 6 months, and 1 year. The elastic modulus (before and after 1 month of water immersion) was determined by the three-point flexural bending test and water sorption values by the water sorption test. RESULTS CSE2 showed significantly higher DC than CSE. The µTBS of CSE2 was significantly higher than that of CSE in all water storage periods. One-year water storage decreased the µTBS of CSE; however, it did not decrease that of CSE2. Regarding the polymerized adhesive resins, the elastic modulus of CSE2 was significantly higher than that of CSE before and after water immersion (p < 0.001), and the water sorption of CSE was higher than that of CSE2. CONCLUSIONS The higher DC of adhesive resins of two-step self-etch adhesives resists water aging and improves the initial bond strengths and durability of the resin-dentin bond.","PeriodicalId":94234,"journal":{"name":"The journal of adhesive dentistry","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"42","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"The journal of adhesive dentistry","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.3290/j.jad.a37726","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 42
Abstract
PURPOSE To evaluate (1) the initial and long-term microtensile bond strengths of two-step self-etch adhesives with different degrees of conversion (DC); (2) the elastic modulus of the respective adhesive resins; (3) the water sorption of the respective adhesive resins. MATERIALS AND METHODS Two two-step self-etch adhesives, Clearfil SE Bond (CSE) and Clearfil SE Bond 2 (CSE2) were used in this study. The DC was determined using ATR/FT-IR with a time-based spectrum analysis. Midcoronal flat dentin surfaces of 24 human molars were prepared with 600-grit SiC paper for microtensile bond strength (µTBS) testing. CSE and CSE2 were applied to the dentin surfaces according to the manufacturer's instructions, followed by composite buildups. The µTBS was measured after water storage for 24 h, 6 months, and 1 year. The elastic modulus (before and after 1 month of water immersion) was determined by the three-point flexural bending test and water sorption values by the water sorption test. RESULTS CSE2 showed significantly higher DC than CSE. The µTBS of CSE2 was significantly higher than that of CSE in all water storage periods. One-year water storage decreased the µTBS of CSE; however, it did not decrease that of CSE2. Regarding the polymerized adhesive resins, the elastic modulus of CSE2 was significantly higher than that of CSE before and after water immersion (p < 0.001), and the water sorption of CSE was higher than that of CSE2. CONCLUSIONS The higher DC of adhesive resins of two-step self-etch adhesives resists water aging and improves the initial bond strengths and durability of the resin-dentin bond.
目的评价(1)不同转化度的两步自蚀刻胶粘剂(DC)的初始和长期微拉伸粘结强度;(2)所粘接树脂的弹性模量;(3)各自胶粘剂树脂的吸水性。材料与方法采用Clearfil SE Bond (CSE)和Clearfil SE Bond 2 (CSE2)两种两步自蚀刻胶粘剂。使用ATR/FT-IR和基于时间的光谱分析来确定DC。采用600粒度SiC纸制备24颗人磨牙中冠牙本质平面,进行微拉伸粘结强度(µTBS)测试。根据制造商的说明将CSE和CSE2应用于牙本质表面,然后进行复合堆积。在水储存24小时、6个月和1年后测量µTBS。弹性模量(浸水1个月前和1个月后)通过三点弯曲试验确定,吸水值通过吸水试验确定。结果scse2的DC明显高于CSE。在所有蓄水期,CSE2的µTBS均显著高于CSE。1年的水储存降低了CSE的µTBS;但对CSE2的影响不明显。对于聚合胶粘剂树脂,CSE2的弹性模量显著高于CSE2浸泡前后的弹性模量(p < 0.001),且CSE2的吸水性高于CSE2。结论两步自蚀刻胶粘剂具有较高的粘接树脂DC,抗水老化,提高了树脂-牙本质的初始粘接强度和耐久性。