Yassaei Soghra, Davari Abdolrahim, Goldani Moghadam Mahjobeh, Kamaei Ahmad
Associate Professor, Department of Orthodontic Dentistry, Member of Social Determinants of Oral Health Research Center, Dental School, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
Associate Professor, Department of Operative Dentistry, Member of Social Determinants of Oral Health Research Center, Dental School, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
J Dent (Tehran). 2014 May;11(3):282-9. Epub 2014 May 31.
The aim of this study was to compare the shear bond strength (SBS) of resin modified glass ionomer (RMGI) and composite resin for bonding metal and ceramic brackets.
Eighty-eight human premolars extracted for orthodontic purposes were divided into 4 groups (n=22). In groups 1 and 2, 22 metal and ceramic brackets were bonded using composite resin (Transbond XT), respectively. Twenty-two metal and ceramic brackets in groups 3 and 4, respectively were bonded using RMGI (Fuji Ortho LC, Japan). After photo polymerization, the teeth were stored in water and thermocycled (500 cycles between 5° and 55°). The SBS value of each sample was determined using a Universal Testing Machine. The amount of residual adhesive remaining on each tooth was evaluated under a stereomicroscope. Statistical analyses were done using two-way ANOVA.
RMGI bonded brackets had significantly lower SBS value compared to composite resin bonded groups. No statistically significant difference was observed between metal and ceramic brackets bonded with either the RMGI or composite resin. The comparison of the adhesive remnant index (ARI) scores between the groups indicated that the bracket failure mode was significantly different among groups (P<0.001) with more adhesive remaining on the teeth bonded with composite resin.
RMGIs have significantly lower SBS compared to composite resin for orthodontic bonding purposes; however the provided SBS is still within the clinically acceptable range.
本研究旨在比较树脂改良玻璃离子水门汀（RMGI）和复合树脂用于粘结金属及陶瓷托槽时的剪切粘结强度（SBS）。
选取88颗因正畸拔除的人类前磨牙，分为4组（每组n = 22）。第1组和第2组分别使用复合树脂（Transbond XT）粘结22个金属和陶瓷托槽。第3组和第4组分别使用RMGI（日本富士正畸LC）粘结22个金属和陶瓷托槽。光固化后，将牙齿置于水中并进行热循环（在5°至55°之间循环500次）。使用万能试验机测定每个样本的SBS值。在体视显微镜下评估每颗牙齿上残留的粘结剂数量。采用双向方差分析进行统计学分析。
与复合树脂粘结组相比，RMGI粘结的托槽SBS值显著更低。在使用RMGI或复合树脂粘结的金属和陶瓷托槽之间未观察到统计学上的显著差异。各组间粘结剂残留指数（ARI）评分的比较表明，各组间托槽脱落模式存在显著差异（P < 0.001），复合树脂粘结的牙齿上残留的粘结剂更多。
用于正畸粘结时，RMGI的SBS显著低于复合树脂；然而其提供的SBS仍在临床可接受范围内。
