Effect of Different Surface Treatments for Ceramic Bracket Base on Bond Strength of Rebonded Brackets

Abstract

The aim of this study was to evaluate the shear bond strength of rebonded ceramic brackets after subjecting the bracket base to different treatments. Seventy-five premolars were selected and randomly distributed into five groups (n=15), according to the type of the bracket surface treatment: I, no treatment, first bonding (control); II, sandblasting with aluminum oxide; III, sandblasting + silane; IV, silica coating + silane; and V, silicatization performed in a laboratory (Rocatec system). The brackets were fixed on an enamel surface with Transbond XT resin without acid etching. The brackets were then removed and their bases were subjected to different treatments. Thereafter, the brackets were fixed again to the enamel surface and the specimens were subjected to shear bond strength (SBS) test. The adhesive remnant index (ARI) was then evaluated for each specimen. Data were subjected to ANOVA and Tukey's tests (a=0.05). A statistically significant difference was observed only between Rocatec and the other groups; the Rocatec group showed the lowest SBS values. The highest SBS values were observed for group 1, without any significant difference from the values for groups II, III and IV. Most groups had a higher percentage of failures at the enamel-resin interface (score 1). It was concluded that the surface treatments of rebonded ceramic brackets were effective, with SBS values similar to that of the control group, except Rocatec group.

The shear bond strength of reconditioned sapphire bracket after rebonding with sandblasting zirconia

“…The results of this study were in accordance with previous research which stated that the sandblasting procedure was effective to clean the surface of the bracket base and increase the strength of ceramic bracket attachment. 10 The area around the microporosity was a white particle of various sizes which is zirconia attached to the base of the bracket base and can be an instrument to enhance attachment. Zirconia particles have a large adsorption capacity against phosphate groups silane, the phosphoric methacrylate.…”

The use of three recycling methods for rebonding of ceramic brackets

“…[18][19][20][21][22] Sandblasting the debonded ceramic bracket bases before rebonding has been studied as a surface-treatment technique and resulted in a lower SBS than new brackets. 14 Application of silane after sandblasting for improving the SBS was studied by many authors, controversy found in literature as silane was reported to decrease SBS 23 , also reported to increase in the SBS 24,25 and reported that it had no effect on SBS 14…”

Residual Adhesive Removal Methods for Rebonding of Debonded Orthodontic Metal Brackets: Systematic Review and Meta-Analysis

“…Adhesive remnants of the dislodged brackets had been conventionally removed in-office by using green stones [ 12 ], direct flame [ 13 ], tungsten-carbide bur [ 14 ], sandblasting [ 15 ], silica coating [ 16 ], or laser application [ 17 ]. Even though these methods can be easily performed out in the dental office with minimal cost, there is no consensus as to which is the best method to remove adhesive remnants from the bracket base.…”