Bond strength comparison and scanning electron microscopic evaluation of three orthodontic bonding systems.
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.
Iijima
Masahiro
M
Department of Orthodontics, School of Dentistry Health Sciences University of Hokkaido, Kanazawa 1757, Ishikari-Tobetsu, Hokkaido 061-0293, Japan. iijima@hoku-iryo-u.ac.jp
Ito
Shuichi
S
Yuasa
Toshihiro
T
Muguruma
Takeshi
T
Saito
Takashi
T
Mizoguchi
Itaru
I
D000134:Acid Etching, Dental; D001840:Dental Bonding; D003743:Dental Enamel / Q000648:ultrastructure*; D003890:Desiccation; D006801:Humans; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D016910:Orthodontic Brackets; D019279:Resin Cements / Q000737:chemistry*; D012463:Saliva; D033081:Shear Strength; D013314:Stress, Mechanical; D013499:Surface Properties
C519484:Beauty Ortho Bond; D019279:Resin Cements; C429625:Transbond Plus Self-Etching Primer; C477790:Transbond XT