Abstract
BackgroundThe objective of this study was to evaluate the effect of orthodontic bracket base shape on shear bond strength and adhesive remnant index.Material and MethodsIn this in vitro study using 140 bovine incisors, shear bond strength (SBS) of brackets with different base shapes (rectangle, flower, round, heart, diamond, star, and football) were measured with an Instron testing machine and tested until bond failure. Adhesive Remnant Index (ARI) scoring was evaluated after debonding to evaluate the location of bond failure. Descriptive and one-way ANOVA post-hoc Tukey statistical analyses were performed with a statistical significance set at p≤0.05.ResultsStatistically significant difference in mean SBS in Newtons was observed for multiple base shapes (p<0.05). The highest mean SBS (N ± SD) was observed in football and flower base shapes (73.83 N ± 53.46; 65.82 N ± 37.89 respectively); the lowest mean was observed with diamond and heart shapes (30.51 N ± 11.73; 33.28 N ± 16.89 respectively). When reported in Megaspascals, statistically significant difference was observed for rectangle base shape (3.54 MPa ± 2.69) when compared to all other base shapes.ConclusionsBracket base shape has an effect on SBS. Higher SBS (N) for rectangle, flower, and football base shape indicates even stress distributions throughout the bracket base. Base shape with a pronounced converging tip over the axial plane may contribute to the reduction in SBS due to increased peak stress concentration resulting in bond failure. Key words:Shaped brackets, Shear bond strength, Adhesive remnant index, WildSmiles®.
Highlights
There is a growing desire towards superior aesthetic appliance during orthodontic treatment [1,2,3]
The mean shear bond strength (SBS) (N) with standard deviation (Mean ± S.D) with respect to different bracket base sha¬pes is shown in figure 2a, which showed overall analysis of variance (ANOVA) p-value to be
Post-hoc Tukey intergroup comparison revealed no statistical differences in mean SBS (N) between control (62.49 N ± 47.57) and all other test groups
Summary
There is a growing desire towards superior aesthetic appliance during orthodontic treatment [1,2,3]. Several studies have investigated various factors within the bracket base component and its effect on bond strength [6,8,9,10,11] These factors include bracket base surface area, mesh wire gauge, number of mesh layers and retention base designs. Due to its recent introduction of shaped orthodontic bracket, there are no published studies investigating the effect of bracket base shape on bond strength. The objective of this study was to evaluate the effect of orthodontic bracket base shape on shear bond strength and adhesive remnant index. Material and Methods: In this in vitro study using 140 bovine incisors, shear bond strength (SBS) of brackets with different base shapes (rectangle, flower, round, heart, diamond, star and football) were measured with an Instron universal testing machine and tested until bond failure. Base shape with a pronounced converging tip over the axial plane may contribute to the reduction in SBS due to increased peak stress concentration resulting in bond failure
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