Khoroushi Maryam, Karvandi Tayebeh Mansouri, Kamali Bentolhoda, Mazaheri Hamid
Dental Materials Research Center and Department of Operative Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
Indian J Dent Res. 2012 May-Jun;23(3):378-83. doi: 10.4103/0970-9290.102234.
Previous studies have shown that dental adhesives increase the bond strength of resin-modified glass-ionomer (RMGI) restorative materials to dentin. This in vitro study has evaluated the effect of etch-and-rinse and self-etch bonding systems v/s cavity conditioner, and in comparison to similar composite resin restorations on maintaining the marginal sealing of RMGI restorations.
98 rectangular cavities (2.5×3×1.5 mm) were prepared on buccal and palatal aspects of 49 human maxillary premolars, randomly divided into 7 groups (N=14). The cavities in groups 1, 2 and 3 were restored using a composite resin (APX). The cavities in groups 4, 5, 6 and 7 were restored using a resin-modified glass-ionomer (Fuji II LC). Before restoring, adhesive systems (Optibond FL = OFL, three-step etch-and-rinse; One Step Plus = OSP, two-step etch-and-rinse; Clearfil Protect Bond = CPB, two-step self-etch) were used as bonding agents in groups 1-6 as follow: OFL in groups 1 and 4, OSP in groups 2 and 5, and CPB in groups 3 and 6, respectively. The specimens in group 7 were restored with GC cavity conditioner and Fuji II LC. All the specimens were thermo-cycled for 1000 cycles. Microleakage scores were determined using dye penetration method. Statistical analyzes were carried out with Kruskal-Wallis and Mann-Whitney U tests (α=0.05).
There were significant differences in microleakage scores at both enamel and dentinal margins between the study groups (P<0.05). The lowest microleakage scores at enamel and dentin margins of RMGI restorations were observed in group 6.
Use of two-step self-etch adhesive, prior to restoring cervical cavities with RMGIC, seems to be more efficacious than the conventional cavity conditioner in decreasing marginal microleakage.
以往研究表明，牙科粘结剂可提高树脂改性玻璃离子（RMGI）修复材料与牙本质之间的粘结强度。本体外研究评估了酸蚀冲洗粘结系统和自酸蚀粘结系统与窝洞调节剂相比，以及与类似复合树脂修复体相比，对维持RMGI修复体边缘封闭性的影响。
在49颗人类上颌前磨牙的颊侧和腭侧制备98个矩形窝洞（2.5×3×1.5mm），随机分为7组（每组n=14）。第1、2和3组的窝洞用复合树脂（APX）修复。第4、5、6和7组的窝洞用树脂改性玻璃离子（Fuji II LC）修复。修复前，第1-6组分别使用粘结系统（Optibond FL = OFL，三步酸蚀冲洗；One Step Plus = OSP，两步酸蚀冲洗；Clearfil Protect Bond = CPB，两步自酸蚀）作为粘结剂，具体如下：第1组和第4组使用OFL，第2组和第5组使用OSP，第3组和第6组使用CPB。第7组的标本用GC窝洞调节剂和Fuji II LC修复。所有标本进行1000次热循环。采用染料渗透法测定微渗漏评分。采用Kruskal-Wallis检验和Mann-Whitney U检验进行统计学分析（α=0.05）。
各研究组在釉质和牙本质边缘的微渗漏评分存在显著差异（P<0.05）。RMGI修复体在釉质和牙本质边缘的微渗漏评分最低的是第6组。
在用RMGIC修复颈部窝洞之前，使用两步自酸蚀粘结剂似乎比传统的窝洞调节剂在减少边缘微渗漏方面更有效。
