Eshghi Alireza, Khoroushi Maryam, Rezvani Alireza
Associate Professor, Torabinejad Dental Research Center and Department of Pediatric Dentistry,School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
Professor, Dental Materials Research Center and Department of Operative Dentistry, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
J Dent (Tehran). 2014 Nov;11(6):644-54. Epub 2014 Nov 30.
Bioactive glass air abrasion is a conservative technique to remove initial decalcified tissue and caries. This study examined the shear bond strength of composite resin to sound and decalcified enamel air-abraded by bioactive glass (BAG) or alumina using etch-and-rinse and self-etch adhesives.
Forty-eight permanent molars were root-amputated and sectioned mesiodistally. The obtained 96 specimens were mounted in acrylic resin; the buccal and lingual surfaces remained exposed. A demineralizing solution was used to decalcify half the specimens. Both sound and decalcified specimens were divided into two groups of alumina and bioactive glass air abrasion. In each group, the specimens were subdivided into two subgroups of Clearfil SE Bond or OptiBond FL adhesives (n=12). Composite resin cylinders were bonded on enamel surfaces cured and underwent thermocycling. The specimens were tested for shear bond strength. Data were analyzed using SPSS 16.0 and three-way ANOVA (α=0.05). Similar to the experimental groups, the enamel surface of one specimen underwent SEM evaluation.
No significant differences were observed in composite resin bond strength subsequent to alumina or bioactive glass air abrasion preparation techniques (P=0.987). There were no statistically significant differences between the bond strength of etch-and-rinse and self-etch adhesive groups (P=1). Also, decalcified or intact enamel groups had no significant difference (P=0.918). However, SEM analysis showed much less enamel irregularities with BAG air abrasion compared to alumina air abrasion.
Under the limitations of this study, preparation of both intact and decalcified enamel surfaces with bioactive glass air abrasion results in similar bond strength of composite resin in comparison with alumina air abrasion using etch-&-rinse or self-etch adhesives.
生物活性玻璃气磨是一种去除早期脱钙组织和龋齿的保守技术。本研究使用酸蚀冲洗和自酸蚀粘结剂，检测复合树脂与经生物活性玻璃（BAG）或氧化铝气磨处理的健康釉质及脱钙釉质之间的剪切粘结强度。
将48颗恒牙进行牙根切断并近远中向切片。将获得的96个标本安装在丙烯酸树脂中；颊面和舌面保持暴露。使用脱矿溶液使一半标本脱钙。健康和脱钙标本均分为氧化铝和气磨生物活性玻璃两组。每组标本再细分为两组，分别使用Clearfil SE Bond或OptiBond FL粘结剂（n = 12）。将复合树脂圆柱体粘结在釉质表面，固化并进行热循环。对标本进行剪切粘结强度测试。使用SPSS 16.0和三因素方差分析（α = 0.05）对数据进行分析。与实验组类似，对一个标本的釉质表面进行扫描电子显微镜评估。
氧化铝或生物活性玻璃气磨制备技术处理后，复合树脂粘结强度无显著差异（P = 0.987）。酸蚀冲洗粘结剂组和自酸蚀粘结剂组的粘结强度无统计学显著差异（P = 1）。此外，脱钙或完整釉质组之间也无显著差异（P = 0.918）。然而，扫描电子显微镜分析显示，与氧化铝气磨相比，生物活性玻璃气磨造成的釉质不规则性要小得多。
在本研究的局限性下，与使用酸蚀冲洗或自酸蚀粘结剂的氧化铝气磨相比，使用生物活性玻璃气磨处理完整和脱钙釉质表面，复合树脂的粘结强度相似。
