Dental Materials
Masomeh Esmaily; Manijeh Mohammadian; Neda Faghfourian
Abstract
Aim: The primer-containing composites, which eliminate the bonding step, decrease clinical time and securely attach the bracket to the tooth. Given the significant role of bonding in the bond strength of orthodontic adhesives, this study aims to investigate the effect of using a universal bond with two ...
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Aim: The primer-containing composites, which eliminate the bonding step, decrease clinical time and securely attach the bracket to the tooth. Given the significant role of bonding in the bond strength of orthodontic adhesives, this study aims to investigate the effect of using a universal bond with two types of primer-containing composites on the bond strength of these composites.Methods: Sixty healthy premolars were collected and divided into four equal groups: GC Ortho Connect composite, GC Ortho Connect composite with a universal bond, OrthoCem composite, and OrthoCem composite with a universal bond. The shear bond strength was measured using a universal testing machine, and the residual adhesive index was measured using a stereomicroscope at a 10x magnification.Results: The shear bond strengths of the GC Ortho Connect group without a universal bond, the GC Ortho Connect group with a universal bond, the OrthoCem group with a universal bond, and the OrthoCem group without a universal bond were calculated to be 21.54, 12.88, 12.37, and 11.68 MPa, respectively. The analysis of variance (ANOVA) showed that the GC Ortho Connect group without a universal bond had a significantly higher shear bond strength than the other groups. The results also indicated that the universal bond reduced the shear bond strength in the GC Ortho Connect composite (p-value <0.001) and had no significant effect on the shear bond strength of the OrthoCem composite (p-value=1.000).Conclusion: While the application of a universal bond considerably diminishes the shear bond strength in the GC Ortho Connect composite, it does not exert a significant influence on the OrthoCem composite. This suggests that the effectiveness of a universal bond may be dependent on the specific composite used, necessitating further investigations into optimizing bonding methods for different composite materials in orthodontics.
Esfandiar Akhavan Niaki; Masomeh Esmaily; Yasamin Farajzadeh Jalali
Abstract
Background: Bonding is the most commonly used technique to attach brackets to tooth surfaces.
Objectives: The aim of this study was to determine the effects of time and concentration of etching with phosphoric acid on shear bond strength (SBS) of orthodontic brackets after using 10-MDP containing adhesive.
Methods: ...
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Background: Bonding is the most commonly used technique to attach brackets to tooth surfaces.
Objectives: The aim of this study was to determine the effects of time and concentration of etching with phosphoric acid on shear bond strength (SBS) of orthodontic brackets after using 10-MDP containing adhesive.
Methods: Fifty intact premolars were randomly divided into 5 groups (n = 10). They were mounted in resin blocks. In control group a gel without phosphoric acid and in-group 2, 3, 4, and 5, phosphoric acid 37% for 5 or 15 seconds and phosphoric acid 15% for 5 or 15 seconds was used respectively. Clearfil SE Bond was used as an adhesive resin for all samples. After bonding of brackets, they were put under 300 thermocycling aging regime and after that the bracket/tooth SBS was measured by universal testing machine. The adhesive remnant index (ARI) was evaluated under a stereomicroscope. Data were statistically analyzed using two-way ANOVA and Kruskal-Wallis test. Results: The highest mean SBS belonged to the 15% phosphoric acid etching in 15 seconds while the lowest value was seen in 37% phosphoric acid etching in 5 seconds. The effect of etching time on SBS was not significant (P = 0.31) but the effect of concentration in SBS has been significant (P < 0.001). In terms of ARI, in application of 15% phosphoric acid, more than 50% of the resin remained on tooth surface. In application of 37% phosphoric acid, all the resin remained on tooth surface.
Conclusions: In using of Clearfil SE bond, containing 10-MDP, preparing enamel by 15% phosphoric acid had created strong enough SBS.