The effect of porcelain surface conditioning on bonding orthodontic brackets.
The purpose of this study was to evaluate the effects of a new self-etching primer/ adhesive used to enhance the shear strength of orthodontic brackets bonded to porcelain surfaces. Forty-five porcelain maxillary central incisor teeth were used in the study. The teeth were divided randomly into three groups: group I (control), the porcelain teeth were etched with 37% phosphoric acid followed by a sealant and the brackets were bonded with a composite adhesive; group II, the porcelain teeth were microetched and hydrofluoric acid and silane applied and metal brackets were then bonded with the composite adhesive; and group III, the porcelain teeth were etched with phosphoric acid and a self-etching primer/adhesive applied before bonding. Brackets precoated with the adhesive were used on all three groups of teeth. All teeth were stored for 24 hours at 37 degrees C before debonding. The results of the analysis of variance (F = 10.7) indicated that there was a significant difference (P = .001) between the three groups. The mean shear bond strengths of conventional bonding using a 37% phosphoric acid and sealant was 4.4 +/- 2.7 MPa, whereas that of microetching followed by the application of hydrofluoric acid and silane was 11.2 +/- 4.7 MPa, and for the new self-etching primer/adhesive it was 10.3 +/- 5.3 MPa. The last two groups had the highest bond strength values and were not significantly different from each other.
Ajlouni
Raed
R
Department of General Dentistry, Baylor College of Dentistry, Dallas, Tex., USA.
Bishara
Samir E
SE
Oonsombat
Charuphan
C
Soliman
Manal
M
Laffoon
John
J
D016009:Chi-Square Distribution; D003722:Dental Alloys; D001840:Dental Bonding; D045662:Dental Etching / Q000379:methods*; D003776:Dental Porcelain; D003799:Dental Stress Analysis; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D016910:Orthodontic Brackets; D019279:Resin Cements; D033081:Shear Strength; D012821:Silanes; D013193:Stainless Steel; D018709:Statistics, Nonparametric; D013499:Surface Properties
C480092:Clearfil repair; D003722:Dental Alloys; D019279:Resin Cements; D012821:Silanes; C477790:Transbond XT; D003776:Dental Porcelain; D013193:Stainless Steel