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Characterization of Dentine to Assess Bond Strength of Dental Composites

机译：牙本质表征以评估牙科复合材料的粘结强度

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This study was performed to develop alternating dentine adhesion models that could help in the evaluation of a self-bonding dental composite. For this purpose dentine from human and ivory was characterized chemically and microscopically before and after acid etching using Raman and SEM. Mechanical properties of dentine were determined using 3 point bend test. Composite bonding to dentine, with and without use of acid pre-treatment and/or the adhesive, were assessed using a shear bond test. Furthermore, micro gap formation after restoration of 3 mm diameter cavities in dentine was assessed by SEM. Initial hydroxyapatite level in ivory was half that in human dentine. Surface hydroxyapatites decreased by approximately half with every 23 s of acid etch. The human dentine strength (56 MPa) was approximately double that of ivory, while the modulus was almost comparable to that of ivory. With adhesive use, average shear bond strengths were 30 and 26 MPa with and without acid etching. With no adhesive, average bond strength was 6 MPa for conventional composites. This, however, increased to 14 MPa with a commercial flowable “self–bonding” composite or upon addition of low levels of an acidic monomer to the experimental composite. The acidic monomer additionally reduced micro-gap formation with the experimental composite. Improved bonding and mechanical properties should reduce composite failures due to recurrent caries or fracture respectively.
机译：进行这项研究是为了开发交替的牙本质粘附模型，该模型可以帮助评估自粘合牙科复合材料。为此，在使用拉曼和SEM进行酸蚀刻之前和之后，对人和象牙的牙本质进行了化学和显微镜表征。使用三点弯曲试验确定牙本质的机械性能。使用剪切粘合力测试评估复合物在牙本质上的粘合力（使用和不使用酸预处理和/或粘合剂）。此外，通过SEM评估了在牙本质中直径3mm的腔体恢复后微间隙的形成。象牙的初始羟磷灰石水平是人类牙本质的一半。每23 s酸蚀，表面羟基磷灰石减少大约一半。人的牙本质强度（56 MPa）约为象牙的两倍，而模量几乎与象牙相当。在使用粘合剂的情况下，在有和没有酸蚀的情况下，平均剪切粘结强度分别为30和26 MPa。在没有粘合剂的情况下，常规复合材料的平均粘合强度为6 MPa。但是，使用市售的可流动“自粘合”复合材料或在实验复合材料中添加少量酸性单体时，该值会增加到14 MPa。酸性单体还减少了实验复合材料的微间隙形成。改进的粘结和机械性能应分别减少由于反复出现的龋齿或断裂而引起的复合材料破坏。

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