Effect of enamel surface treatment on the bond strength of metallic brackets in rebonding process

Abstract

Bond failure after rebonding for newly placed brackets can be reduced by appropriate enamel surface treatment. This in vitro study investigated the effect of two enamel surface treatments on the bond strength of metallic brackets in the rebonding process. After debonding the brackets and removing the residual adhesive on the enamel surface of 50 upper premolar teeth, the teeth were divided into two equal groups. In the first group, the enamel surface was etched with phosphoric acid 37 per cent, and in the second group, the teeth were sandblasted prior to acid etching. After bonding of the new brackets, the shear bond strength (SBS), probability of bond failures, and adhesive remnant index (ARI) were determined and compared with the t-test, Weibull analysis, and chi-square test. Mean SBS in both groups did not differ significantly (P = 0.081). Most bond failures occurred with ARI scores of 2 and 3, and the difference between the two groups was statistically significant (P < 0.001). Weibull analysis showed that for a given stress, the probability of failure differed between groups. Enamel surface preparation with sandblasting prior to acid etching did not significantly improve SBS in bracket rebonding and left more residual adhesive remnants on the enamel surface.

Influence of the bracket on bonding and physical behavior of orthodontic resin cements

“…The material is fully cured after 24 h 29) . Weibull m for T was 4.41 with metallic brackets 30) . In that paper, as in our study, the failure analysis showed mainly cohesive failures (ARI 1-2) or adhesive failures to the bracket base.…”

Shear Bond Strength of Metallic Brackets: An In Vitro Stud

“…Over the years, since the study carried out in 1965 [2], which idealized the bonding of brackets on the buccal surfaces of permanent teeth, numerous authors have studied ways of The bonding material selected for fixing brackets (Transbond® XT) is frequently used in orthodontic bonding procedures, which is a brand already established in the dental market and in several studies in literature [3,4,6,[8][9][10][11]. Conventional metallic orthodontic brackets were chosen because they are widely used in laboratory tests [3][4][5][6] and therefore widely used in orthodontic practice compared to national self-bonded and conventional imported materials.…”

“…Conventional metallic orthodontic brackets were chosen because they are widely used in laboratory tests [3][4][5][6] and therefore widely used in orthodontic practice compared to national self-bonded and conventional imported materials.…”

“…However, it is necessary to assess these products as imported products are thoroughly studied in literature [3][4][5][6], since professionals need to know if these materials exhibit good quality and adequate strength to withstand the stresses imposed by the masticatory system. Shear tests performed in laboratory are one of the most common scientific ways to measure and assess the adhesiveness of restorative materials to dental tissues.…”

“…Undoubtedly, one of the greatest advantages of laboratory tests is the possibility of a strict control of the study phases, since external variables could influence the results. From the classic study that first assessed the adhesive dentistry in 1955 [7], these tests have been used to evaluate the bond strength of dental materials [3][4][5][6][7][8].…”