James Vandana, Madhubala Manavalan Madhana, Devarajan Shari S, Mahalaxmi Sekar, Sathyakumar Shanmugasundaram
Department of Conservative Dentistry and Endodontics, Tagore Dental College Melakkottaiyur Post, Rathinamangalam, Tamil Nadu, India.
Department of Conservative Dentistry and Endodontics, SRM Dental College, Ramapuram, Chennai, Tamil Nadu, India.
Front Dent. 2020 Dec 17;17:35. doi: 10.18502/fid.v17i35.5199. eCollection 2020.
This study aimed to evaluate the degree of conversion (DC%), shear bond strength (SBS), bond durability, and the resin-dentin interface of polydopamine (PDA) incorporated total-etch adhesive system.
Five percentage by weight (wt%) concentration of PDA incorporated adhesive was prepared and its polymerization was evaluated using Fourier-transform infrared spectroscopy. The results were compared with the DC% of conventional total-etch adhesive (Adper Single Bond 2) using independent t-test. Occlusal surfaces of 80 freshly extracted human premolars were sectioned to expose the dentin, which was acid-etched. The samples were divided into two groups (n=40) of total-etch adhesive and total-etch adhesive+PDA. Composite resin blocks were built up over the bonded surface and cured. Each group was subdivided into two subgroups (n=20) of immediate and post-aging evaluation. Samples were immersed in 10% sodium hypochlorite for five hours, and then, the SBS was evaluated using a universal testing machine at a crosshead speed of 1 mm/minute. The resin-dentin interface was evaluated using confocal laser scanning microscopy. Data were analyzed using two-way analysis of variance and post-hoc Bonferroni test.
DC% was not affected by the addition of 5% PDA to the adhesive (group 2). The SBS of group 2A was significantly higher than that of group 1A. There was no significant reduction of SBS in group 2B. The hybrid layer was less degraded after aging in group 2B compared to group 2A.
PDA incorporated adhesive increased the immediate bond strength and durability without changing the DC%.
本研究旨在评估掺入聚多巴胺（PDA）的全酸蚀粘接系统的转化率（DC%）、剪切粘结强度（SBS）、粘结耐久性以及树脂-牙本质界面。
制备含5%重量百分比（wt%）PDA的粘接剂，并使用傅里叶变换红外光谱法评估其聚合情况。使用独立t检验将结果与传统全酸蚀粘接剂（Adper Single Bond 2）的DC%进行比较。将80颗新鲜拔除的人类前磨牙的咬合面切开以暴露牙本质，然后进行酸蚀。将样本分为全酸蚀粘接剂组和全酸蚀粘接剂+PDA组两组（n = 40）。在粘接表面堆积复合树脂块并固化。每组再分为即时评估和老化后评估两个亚组（n = 20）。将样本浸入10%次氯酸钠中5小时，然后使用万能测试机以1毫米/分钟的十字头速度评估SBS。使用共聚焦激光扫描显微镜评估树脂-牙本质界面。数据采用双向方差分析和事后Bonferroni检验进行分析。
向粘接剂中添加5% PDA（第2组）对DC%没有影响。第2A组的SBS显著高于第1A组。第2B组的SBS没有显著降低。与第2A组相比，第2B组老化后混合层的降解程度较小。
掺入PDA的粘接剂在不改变DC%的情况下提高了即时粘结强度和耐久性。
