An evaluation and comparison of orthodontic bracket bond strengths achieved with self-etching primer.
The bonding of orthodontic brackets to enamel is a multistep process. To simplify bonding and decrease chair time, Transbond Plus Self-Etching Primer (3M Unitek, Monrovia, Calif) has been introduced; the primer combines the etching, rinsing, and priming steps. This in vitro study evaluated the shear bond strengths and interoperator variability of self-etching primer, as compared with conventional phosphoric acid etching with 2 common orthodontic resins. A total of 214 teeth were bonded, according to the following protocols: group A: self-etching primer plus Transbond XT light-cured resin (3M Unitek); group B: 35% phosphoric acid (15 seconds) plus Transbond XT resin; and group C: 37% phosphoric acid (15 seconds) plus Enlight bonding resin (Ormco, Glendora, Calif). Significantly higher bond strengths were seen in group B than in group A (P =.004) and group C (P =.002). The mean shear bond strengths of group A were not significantly different from those of group C (P =.99). When 3 orthodontists bonded a total of 60 premolars using the protocols of groups A and B, significant differences in shear bond strengths and strength ranking were found. The mean values they obtained using the self-etching primer were not significantly different, but significant differences in mean values were found between operators when the phosphoric acid-etching technique was used.
Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada.
Helen S I
HS
Grubisa
Giseon
G
Heo
Don
D
Raboud
Kenneth E
KE
Glover
Paul W
PW
Major
D000134:Acid Etching, Dental / Q000379:methods*; D001840:Dental Bonding; D003743:Dental Enamel; D003799:Dental Stress Analysis; D006801:Humans; D008422:Materials Testing; D015588:Observer Variation; D016910:Orthodontic Brackets; D010756:Phosphoric Acids; D019279:Resin Cements; D033081:Shear Strength
C418867:Enlight; D010756:Phosphoric Acids; D019279:Resin Cements; C429625:Transbond Plus Self-Etching Primer; C477790:Transbond XT; C030242:phosphoric acid