Effects of conventional and self-etching adhesive systems on bond strength of orthodontic attachments bonded to erupted and unerupted teeth

Abstract

Objective: The aim of this study was to evaluate and compare the shear bond strength (SBS) and failure-mode of orthodontic buttons bonded to erupted and unerupted teeth with conventional and self-etching adhesive systems. Methods: Eighty-four erupted and 84 unerupted, human third-molar teeth were used. For both groups, the buccal surfaces of each tooth were assigned one of the following type of adhesive systems (n = 12). A, Conventional systems: 1, Transbond XT (3M Unitek, Monrovia, CA, USA); 2, Prime & Bond NT (Dentsply/Caulk, Milford, USA); 3, Single Bond (3M ESPE, Minnesota, USA); and B, Self-etching adhesives; 4, Clearfil SE Bond (Kuraray, Okayama, Japan); 5, Transbond Plus (3M Unitek, Monrovia, CA, USA); 6, Clearfil S3 (Kuraray, Tokyo, Japan); 7, G Bond (GC, Tokyo, Japan). The SBSs of the attachments and the adhesive remnant index (ARI) scores were recorded. Data were analyzed with analysis of variance (ANOVA), independent-sample t-test and chi-square tests. Results: When the SBSs of erupted and unerupted teeth were compared, only the Clearfil-SE Bond and G-Bond were significantly different. Bond strengths of all adhesive systems were higher in unerupted teeth than erupted teeth, except the Single-Bond system. Conclusions: When using conventional adhesives, bonding to erupted and unerupted teeth may not be significantly different. However, clinicians need to take into consideration the types of self-etching systems before usage. (Korean J Orthod 2010;40(4):267-275)

Shear bond strength of orthodontic attachments bonded to impacted teeth under in vivo and in vitro conditions

“…In this study, the mean SBSs for stainless steel buttons bonded in vitro with Transbond XT resin were higher than those reported by Nur et al. , who reported an average value of 6.6 MPa for the same adhesive resin and round‐based stainless steel buttons bonded to extracted molar teeth. Mean shear bond strengths higher than those obtained in the present study were recorded by Nemeth et al.…”

“…However, the present results may, at least in part, be compared with those of previous studies in which similar in vitro bonding procedures, test methods and materials were used. In this study, the mean SBSs for stainless steel buttons bonded in vitro with Transbond XT resin were higher than those reported by Nur et al (19), who reported an average value of 6.6 MPa for the same adhesive resin and round-based stainless steel buttons bonded to extracted molar teeth. Mean shear bond strengths higher than those obtained in the present study were recorded by Nemeth et al (18), who tested mesh-based stainless steel buttons bonded with Transbond XT resin on extracted human molars.…”