Bond Strength Comparison and Scanning Electron Microscopic Evaluation of Three Orthodontic Bonding Systems

Abstract

This study sought to assess the efficacy of two self-etching primer systems (Transbond Plus and Beauty Ortho Bond) on orthodontic brackets. Therefore, shear bond strengths and bracket-adhesive failure modes (ARI scores) were determined and compared against an etch-and-rinse adhesive system (Transbond XT) under two experimental conditions (dry and saliva application). Shear bond strength test was performed at a crosshead speed of 0.5 mm/min, while enamel surfaces and enamel-adhesive interfaces were examined with SEM. There were no significant differences between Transbond XT (9.15 MPa) and Transbond Plus (9.74 MPa) under the dry condition, whereas that of Beauty Ortho Bond (6.47 MPa) was significantly lower than these two systems. Under SEM examination, both self-etching primers showed a milder etching effect and decreased depth of resin penetration into intact enamel than Transbond XT. In conclusion, results of this study showed that both self-etching systems seemed to offer more merits than conventional acid etching because of fewer irreversible changes to enamel.

Comparison of enamel-bracket bond strength using direct- and indirect-bonding techniques with a self-etching ion releasing S-PRG filler

“…Numerous studies have investigated the strength of self-etching primer systems 15,18,19,[23][24][25][26][27][28][29][30][31][32][33] . Most of these studies demonstrated that self-etching systems have significantly lower SBS values than conventional acidetching systems 18,24,26,34,35) .…”

Effects of application time and agitation for bonding orthodontic brackets with two self-etching primer systems

“…It has been suggested that bond strength values of between approximately 6.0 and 8.0 MPa are sufficient for clinically effective orthodontic bonding 12,13) . Self-etching primer systems for use in orthodontics have been studied and the shear bond strength values were similar to those with a conventional etch & rinse system 3,7,9) . On the other hand, bond failure of brackets not only can be frustrating for the practitioner, but also can significantly affect treatment efficiency and have an economic impact on a practice 14) .…”

“…Excess bonding material was removed with a small scaler. All samples were light-cured for 9 . Table 1 Materials and instruction employed in present study 20 seconds (10 seconds from each proximal side).…”

“…Ostby et al 22) reported that increasing the application time of Transbond Plus self-etching primer from 3 seconds to 15 seconds did not significantly increase the shear bond strength. Recently, another self-etching system for orthodontic purposes, Beauty Ortho Bond (Shofu, Kyoto, Japan), was developed 7,9) . The characteristics of Beauty Ortho Bond self-etching system are to contain S-PRG fillers in this adhesive resin.…”

“…Bonding practices based on a self-etching primer, which was originally used in restorative dentistry to bond composite resin restorations to both dentin and enamel 1,2) , are now being used in clinical orthodontics [3][4][5][6][7][8][9] . One obvious advantage of using a self-etching primer is to expedite the bonding procedure by combining etching and priming into a single step 10) .…”