Zakavi Faramarz, Gholizadeh Sarah, Dibazar Sana, Esmaeili Mehdi
Dept. of Operative and Esthetic Dentistry, Dental Faculty, Ahvaz Jundishapur Medical Science University, Ahvaz, Iran.
Dept. of Operative and Esthetic Dentistry, Dental Faculty, Tabriz University of Medical Science, Tabriz, Iran.
J Dent (Shiraz). 2023 Mar;24(1 Suppl):103-111. doi: 10.30476/dentjods.2022.92281.1624.
Dentin margins have a higher microleakage than enamel in composite restorations due to weaker bond durability. Clinically, most margins are located apical to cementoenamel junction on the dentin or cementum. Different surface preparation methods may have dissimilar effects on the shear bond strength of resin-modified glass ionomer (RMGI) to composite resin, regarding the layering technique employed in restoration of these cavities.
This study aimed to investigate the shear bond strength of RMGI to composite resin using different mechanical surface preparation methods.
In this study, 72 RMGI samples were prepared in six groups (n=12): control, acid etching, air abrasion with aluminum oxide (AlO), bur, Er: YAG laser, and Er, Cr: YSGG laser groups. Two samples from each group were randomly examined under a scanning electron microscope (SEM). A bonding layer and composite resin were applied and cured. Then the samples were subjected to 5000-cycles thermocycling procedure. The shear bond strength was then evaluated using a universal testing machine. Finally, the failed surface of the samples was evaluated under a light microscope to examine the failure mode. For the statistical analysis, one-way ANOVA and Games-Howell post hoc test was used to compare quantitative variables and chi-squared test to investigate the relationship between the failure mode and the groups. The significant level was set at 0.05.
The results showed significant differences between the mean of the strength variable in the groups (< .001). The acid-etch and air abrasion groups exhibited significantly the lowest and highest values, respectively. The chi-squared test results also showed a significant relationship between the failure mode in the study groups (= .008).
Acid etching before completing RMGI polymerization could adversely affect shear bond strength. The air abrasion and bur methods are among the best methods to increase the shear bond strength between composite resin and RMGI. Using Er, Cr: YSGG and Er: YAG lasers could increase the bond strength results.
由于粘结耐久性较弱，在复合树脂修复体中，牙本质边缘的微渗漏比釉质更高。临床上，大多数边缘位于牙本质或牙骨质的牙釉质界根尖侧。对于这些窝洞修复中采用的分层技术，不同的表面处理方法可能对树脂改性玻璃离子体（RMGI）与复合树脂的剪切粘结强度有不同影响。
本研究旨在使用不同的机械表面处理方法研究RMGI与复合树脂的剪切粘结强度。
在本研究中，制备了72个RMGI样本，分为六组（n = 12）：对照组、酸蚀组、氧化铝（AlO）气磨组、车针组、铒钇铝石榴石（Er:YAG）激光组和铒铬钇钪镓石榴石（Er,Cr:YSGG）激光组。每组随机抽取两个样本在扫描电子显微镜（SEM）下检查。施加并固化粘结层和复合树脂。然后对样本进行5000次热循环程序。接着使用万能试验机评估剪切粘结强度。最后，在光学显微镜下评估样本的断裂表面以检查断裂模式。对于统计分析，使用单因素方差分析和Games-Howell事后检验比较定量变量，并使用卡方检验研究断裂模式与各组之间关系。显著性水平设定为0.05。
结果显示各组强度变量均值之间存在显著差异（< .001）。酸蚀组和气磨组分别表现出显著最低值和最高值。卡方检验结果还显示研究组的断裂模式之间存在显著关系（= .008）。
在完成RMGI聚合之前进行酸蚀可能会对剪切粘结强度产生不利影响。气磨和车针方法是提高复合树脂与RMGI之间剪切粘结强度的最佳方法之一。使用Er,Cr:YSGG和Er:YAG激光可以提高粘结强度结果。
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