A challenge to the conventional wisdom that simultaneous etching and resin infiltration always occurs in self-etch adhesives
A challenge to the conventional wisdom that simultaneous etching and resin infiltration always occurs in self-etch adhesives
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DOI：
10.1016/j.biomaterials.2004.04.003
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发表时间：
2005-03-01
期刊：
影响因子：
14
通讯作者：
Tay, FR
中科院分区：
文献类型：
--
作者：
Carvalho, RM;Chersoni, S;Tay, FR
这项研究提供了形态学证据，证明在一些温和的自蚀刻粘合剂中，脱矿深度和树脂渗透深度之间可能存在差异。用5种一步法和5种二步法自酸蚀粘结剂粘结离体人第三磨牙的完整牙本质标本。将含有树脂-牙本质界面的1毫米厚的平板浸入50重量%的硝酸氨银水溶液中，并进行TEM检查。在一步和两步自酸蚀粘合剂的温和版本中，在混合层下方识别出部分蚀刻但未渗透的牙本质区域。该区域的特征在于沿矿化胶原纤维的纤维间空间沿着出现银沉积物。从一步自蚀刻粘合剂Xeno III、iBond、Brush&Bond和实验粘合剂中清楚地识别出银渗透的原纤维间空间，并且在两步自蚀刻粘合剂Clearfil SE Bond和Clearfil Protect Bond中更薄并且仅偶尔观察到。更具侵略性的一步和两步粘合剂，表现出更突然的过渡，从完全脱矿到矿化的牙本质是没有这些银渗透的纤维间的空间下的混合层。在一些自蚀刻粘合剂中观察到的不完全树脂渗透可能是由于酸性单体朝向混合层的基部的蚀刻潜力降低，或者酸性但不可聚合的水解粘合剂组分的存在，从而产生了由这些自蚀刻粘合剂产生的粘合的降解的潜在位点。(C)2004爱思唯尔有限公司保留所有权利。
This study provided morphological evidence that discrepancies between the depth of demineralisation and the depth of resin infiltration can occur in some mild self-etch adhesives. Sound dentine specimens derived from extracted human third molars were bonded with 5 one-step and 5 two-step self-etch adhesives. One millimeter thick slabs containing the resin-dentine interfaces were immersed in 50wt% aqueous ammoniacal silver nitrate and processed for TEM examination. A zone of partially etched but uninfiltrated dentine was identified beneath the hybrid layers in the milder versions of both one-step and two-step self-etch adhesives. This zone was characterised by the occurrence of silver deposits along the interfibrillar spaces of mineralised collagen fibrils. The silver infiltrated interfibrillar spaces were clearly identified from the one-step self-etch adhesives Xeno III, iBond, Brush&Bond and the experimental adhesive, and were thinner and only occasionally observed in the two-step self-etch adhesives Clearfil SE Bond and Clearfil Protect Bond. The more aggressive one-step and two-step adhesives that exhibit more abrupt transitions from completely demineralised to mineralised dentin were devoid of these silver-infiltrated interfibrillar spaces beneath the hybrid layers. Incomplete resin infiltration observed in some self-etch adhesives may be caused by the reduced etching potential of the acidic monomers toward the base of hybrid layers, or the presence of acidic but non-polymerisable hydrolytic adhesive components, creating potential sites for the degradation of the bonded created by these self-etch adhesives. (C) 2004 Elsevier Ltd. All rights reserved.