The Influence of No-Primer Adhesives and Anchor Pylons Bracket Bases on Shear Bond Strength of Orthodontic Brackets

Abstract

Objective. The aim of this study was to compare the shear bond strength (SBS) and adhesive remnant index (ARI) scores of no-primer adhesives tested with two different bracket bases. Materials and Methods. 120 bovine permanent mandibular incisors were divided into 6 groups of 20 specimens. Two brackets (ODP) with different bracket bases (anchor pylons and 80-gauge mesh) were bonded to the teeth using a conventional adhesive (Transbond XT) and two different no-primer adhesive (Ortho Cem; Heliosit) systems. Groups were tested using an instron universal testing machine. SBS values were recorded. ARI scores were measured. SEM microphotographs were taken to evaluate the pattern of bracket bases. Statistical analysis was performed. ANOVA and Tukey tests were carried out for SBS values, whereas a chi-squared test was applied for ARI scores. Results. Highest bond strength values were reported with Transbond XT (with both pad designs), Ortho Cem bonded on anchor pylons and Heliosit on 80-gauge mesh. A higher frequency of ARI score of “3” was reported for Transbond XT groups. Other groups showed a higher frequency of ARI score “2” and “1.” Conclusion. Transbond XT showed the highest shear bond strength values with both pad designs.

Orthodontic bracket bonding without previous adhesive priming: A meta-regression analysis

“…After bias risk analysis (Table 1), one study 11 was excluded due to its high risk of bias. Nine studies 2,3,8,[12][13][14][15][16][17] were included; descriptive data, random-effect means, confidence interval, and weight of each study are shown in Table 2. The lowest mean for bond strength in a group was 6.42 MPa; the highest value was 34.8 MPa, with 50% of the groups' means being lower than 11.0 MPa.…”

“…1 Thus, two-step orthodontic adhesives, without prior application of adhesive resin, has appeared on the market in order to decrease the procedure time of bracket bonding. 2 These composites, called flowable resins, have a smaller amount of inorganic filler and therefore have low viscosity compared with conventional resins. 3 Furthermore, a previous report has shown that adhesive resins have greater cytotoxicity for gingival fibroblasts.…”

“…However, recent in vitro studies have shown that orthodontic adhesives without priming reached bond strength comparable to that found with previous primer application. 2,7 The consensus in the orthodontic literature 2,8 about the factors that might influence bracket bond strength are the base surface area, specimen storage time, enamel conditioning procedures, type of adhesive and resin used, and bracket base design. Nevertheless, many studies did not properly report significant test conditions.…”

Effects of Ozone and Prophylactic Antimicrobial Applications on Shear Bond Strength of Orthodontic Brackets

“…Additionally, Cacciafesta et al (24) found bond strength to be significantly reduced by bleaching prior to bonding, whereas Hussein et al (25) found bond strength to be unaffected by the application of 12% chlorhexidine for 1 week prior to bonding, in an in vivo study. Additionally, Scribante et al (26) investigated the three different adhesives with two types of bracket base, finding Transbond XT to demonstrate the highest bond strength values. Aguiar et al (27) also evaluated the adhesives and their curing mode, reporting that the light activation of certain cement systems increases bond strength, although the curing mode does not affect bond strength in all cases.…”

Resistencia al cizallamiento e indice adhesivo remanente (ARI) de dos cementos ortodónticos fotopolimerizables antes y después del termociclado

“…(13) La importancia de realizar este proceso es que permite simular el comportamiento clínico de los materiales dentales como las resinas. (16) En el presente estudio se efectuaron 500 ciclos de termociclado, similar a los estudios realizados por autores como Bishara y col (13) y Daub y col. (9) El (24) , Oliveira y col (25) encontraron valores promedio de resistencia al cizallamiento de 8.31 MPa y 10.61 MPa respectivamente para el cemento OrthoCem, similares a los encontrados en esta investigación. Esta discrepancia entre ambos cementos puede deberse a que el cemento OrthoCem presenta el primer y el cemento en la misma jeringa a diferencia del Transbond TM XT.…”