Article information
Year 2017 Volume 67 Issue 3 Page 225-235
Title:
Comparison of Shear Bond Strength, Water Sorption and Solubility of 3 Glass Ionomer Cements for Direct Bonding of Orthodontic Brackets in vitro
Keyword(s):
Glass Ionomer Cement, Resin-modified Glass Ionomer Cement, Orthodontic Bracket, Shear Bond Strength, Water Sorption, Solubility
Abstract:
The purpose of this study was to evaluate shear bond strength, water sorption and solubility of three brands of glass ionomer cement adhesives; RU-HBM1 (a resin-modified glass ionomer cement prototype), Hy-bond Glasionomer CX (GIC) and Fuji Ortho LC (RMGIC) as orthodontic adhesives. For shear bond strength test, thirty extracted human premolar teeth were divided into 3 groups (n=10) and bonded to stainless steel brackets. Shear bond strength was measured by a universal testing machine with a 1.0 mm/min crosshead speed. For the water sorption and solubility tests, six disc specimens were prepared for each group. Water sorption and solubility of the different adhesives were calculated by the weight of samples before and after immersion in artificial saliva and after desiccation. Data were analyzed by one-way ANOVA. The RU-HBM1 had significantly higher shear bond strength than Hy-bond Glasionomer CX but lower strength than Fuji Ortho LC (p<0.05). In addition, the RU-HBM1 had the lowest mean water sorption value and was the only orthodontic adhesive that had a positive mean solubility value. In conclusion, RU-HBM1 provided adequate shear bond strength for clinical orthodontic purposes and showed a lower water sorption parameter than commercial glass ionomer cements.