Shirani Farzaneh, Birang Reza, Ahmadpour Elmira, Heidari Zeynab, Ostadsharif Memar Rouzbeh, Zarei Zahra, Fekrazad Reza
Department of Operative Dentistry, Dental Materials Research Center, Dental Research Institue, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
Torabinejad Dental Research Center, Department of Periodontics, Dental Faculty, Isfahan University of Medical Sciences, Isfahan, Iran.
J Lasers Med Sci. 2021 Dec 1;12:e74. doi: 10.34172/jlms.2021.74. eCollection 2021.
This study was conducted to assess the microleakage in Er:YAG laser-ablated and bur-prepared root and coronal dentin cavities using self-etch and total-etch adhesive systems. Sixty extracted caries-free human third molars were sectioned for dentin exposure. Then, two standard class V cavities were prepared in the root and coronal dentin of each tooth and allocated to one of the following conditioning groups randomly (n=12/Group): G1: Diamond bur for cavity preparation and single bond (BESB) etch-and-rinse adhesive for bonding, G2: Er:YAG laser (160 mJ, 20 Hz, 29.88 J/cm) and SB (LESB), G3: Er:YAG laser and SB without acid etching (LSB), G4: Diamond bur and Clearfil SE Bond (BCSE) self-etch system, and G5: Er:YAG laser and Clearfil SE Bond (LCSE). The cavities were filled with Z100 composite resin. Dye penetration was assessed after thermocycling. Data analysis was done by Kruskal-Wallis and Mann-Whitney U tests. Statistical significance was set at <0.05. The results showed there were no statistically significant differences in microleakage between the two preparation methods (bur and laser) or the bonding agents applied (>0.05). Regardless of the cavity preparation method, dye penetration was significantly higher in coronal dentin than in root dentin (<0.05). The Er:YAG laser had the same efficacy as the conventional method for cavity preparation, and microleakage did not depend on the bonding agent. Microleakage was significantly higher in coronal restorations than in root restorations.
本研究旨在评估使用自酸蚀和全酸蚀粘结系统时，铒钇铝石榴石（Er:YAG）激光消融和用牙钻制备的牙根及冠部牙本质洞型的微渗漏情况。选取60颗拔除的无龋人类第三磨牙进行切片以使牙本质暴露。然后，在每颗牙齿的牙根和冠部牙本质中制备两个标准V类洞型，并随机分配到以下处理组之一（每组n = 12）：G1：用金刚砂车针制备洞型并使用单键（BESB）酸蚀冲洗粘结剂进行粘结；G2：Er:YAG激光（160 mJ，20 Hz，29.88 J/cm）和SB（LESB）；G3：Er:YAG激光和不进行酸蚀的SB（LSB）；G4：金刚砂车针和Clearfil SE Bond（BCSE）自酸蚀系统；G5：Er:YAG激光和Clearfil SE Bond（LCSE）。用Z100复合树脂填充洞型。热循环后评估染料渗透情况。采用Kruskal-Wallis检验和Mann-Whitney U检验进行数据分析。设定统计学显著性水平为<0.05。结果显示，两种制备方法（牙钻和激光）或所应用的粘结剂之间，微渗漏无统计学显著差异（>0.05）。无论洞型制备方法如何，冠部牙本质中的染料渗透均显著高于根部牙本质（<0.05）。Er:YAG激光在洞型制备方面与传统方法具有相同的效果，且微渗漏不取决于粘结剂。冠部修复体中的微渗漏显著高于根部修复体。
