Ishwarya Gurucharan, Vidhya Sampath, Mahalaxmi Sekar
SRM Dental College, Department of Conservative Dentistry and Endodontics, Chennai, 600089, India.
Heliyon. 2020 Feb 15;6(2):e03424. doi: 10.1016/j.heliyon.2020.e03424. eCollection 2020 Feb.
The aim of this study was to evaluate the marginal integrity of an alkasite restoration in comparison to that of a conventional composite resin restoration following intra-coronal bleaching with 30% hydrogen peroxide (HP) containing sweet potato extract (SPE) as an additive. Access cavities were prepared in 60 extracted human incisors. The teeth were decoronated 2mm below the CEJ and the pulp chambers were sealed cervically. The samples were divided into two groups (n = 30) based on the type of restorative material - group I: Hybrid composite resin and group II: Alkasite restorative material. Both the groups were divided into three subgroups (n = 10) based on the intra-coronal bleaching agent used namely, subgroup A: no bleaching (NB); subgroup B: 30% hydrogen peroxide (HP) and subgroup C: 30% hydrogen peroxide containing SPE (HSP). The tooth-restorative interface was observed under a scanning electron microscope (SEM) to determine the marginal integrity. The results were tabulated and statistically analyzed using one-way ANOVA. Specimens bleached with HP alone showed higher marginal gaps, irrespective of the restorative material used. Subgroups A and C showed lesser marginal gaps under both the restorative materials. An improved marginal integrity was seen with the alkasite material. It can be concluded that the addition of SPE to HP improves the marginal integrity of the coronal restorative material placed immediately post-bleaching. The new alkasite material holds promise as a permanent coronal seal in cases of intra-coronal bleaching.
本研究的目的是评估在使用含红薯提取物（SPE）作为添加剂的30%过氧化氢（HP）进行冠内漂白后，碱式玻璃离子修复体与传统复合树脂修复体的边缘完整性。在60颗拔除的人切牙上制备开髓洞。将牙齿在牙冠颈缘下方2mm处截冠，并在颈部封闭髓腔。根据修复材料的类型将样本分为两组（n = 30）——第一组：混合复合树脂；第二组：碱式玻璃离子修复材料。根据所使用的冠内漂白剂，将两组再分为三个亚组（n = 10），即A亚组：未漂白（NB）；B亚组：30%过氧化氢（HP）；C亚组：含SPE的30%过氧化氢（HSP）。在扫描电子显微镜（SEM）下观察牙齿与修复体的界面，以确定边缘完整性。将结果制成表格，并使用单因素方差分析进行统计学分析。无论使用何种修复材料，仅用HP漂白的标本边缘间隙更大。A亚组和C亚组在两种修复材料下的边缘间隙较小。碱式玻璃离子材料的边缘完整性有所改善。可以得出结论，在HP中添加SPE可提高漂白后立即放置的冠修复材料的边缘完整性。在冠内漂白的情况下，新型碱式玻璃离子材料有望作为永久性的冠部封闭材料。
