Effect of surface treatment of brackets and mechanical cycling on adhesion to enamel.
This in vitro study sought to evaluate how surface conditioning from bracket and mechanical cycling aging affected the bond strength between metallic brackets and bovine enamel, and to determine the adhesive remnant index. Eighty bovine incisors were embedded in acrylic resin using polyvinyl chloride rings and divided into 4 groups based on surface treatment (n = 20). Group 1 (control) received no surface treatment, Group 2 specimens were sandblasted with aluminum oxide particles, Group 3 specimens were sandblasted with silicon oxide and treated with a tribochemichemical silica coupling agent, and Group 4 specimens were primed with a multidomain protein-based agent. Half of the specimens were submitted to shear bond testing, while the others were subjected to mechanical cycling. ANOVA showed that mechanical cycling did not have a significant influence on bond strength (P = 0.9244), while surface conditioning of the brackets did (P = 0.0001). Tukey's test results were similar for mechanical cycling, and indicated that only Group 3 significantly improved the resin bond to the brackets; however, this group also demonstrated the highest percentage of enamel failure.
Fabiola Rossato
FR
Arrais
Felipe
F
Degrazia
Bernardo Urbanetto
BU
Peres
Vilmar Antonio
VA
Ferrazzo
Renesio Armindo
RA
Grehs
Luiz Felipe
LF
Valandro
D000818:Animals; D002417:Cattle; D001840:Dental Bonding / Q000379:methods; D003738:Dental Cements / Q000627:therapeutic use*; D003743:Dental Enamel; D045662:Dental Etching / Q000379:methods*; D003799:Dental Stress Analysis / Q000379:methods; D007180:Incisor; D016910:Orthodontic Brackets; D013314:Stress, Mechanical
D003738:Dental Cements
adhesion; brackets; mechanical cycling; surface treatment