Bonding brackets on white spot lesions pretreated by means of two methods.
OBJECTIVE
The aim of this study was to evaluate the shear bond strength (SBS) of brackets bonded to demineralized enamel pretreated with low viscosity Icon Infiltrant resin (DMG) and glass ionomer cement (Clinpro XT Varnish, 3M Unitek) with and without aging.


METHODS
A total of 75 bovine enamel specimens were allocated into five groups (n = 15). Group 1 was the control group in which the enamel surface was not demineralized. In the other four groups, the surfaces were submitted to cariogenic challenge and white spot lesions were treated. Groups 2 and 3 were treated with Icon Infiltrant resin; Groups 4 and 5, with Clinpro XT Varnish. After treatment, Groups 3 and 5 were artificially aged. Brackets were bonded with Transbond XT adhesive system and SBS was evaluated by means of a universal testing machine. Statistical analysis was performed by one-way analysis of variance followed by Tukey post-hoc test.


RESULTS
All groups tested presented shear bond strengths similar to or higher than the control group. Specimens of Group 4 had significantly higher shear bond strength values (p < 0.05) than the others.


CONCLUSIONS
Pretreatment of white spot lesions, with or without aging, did not decrease the SBS of brackets.
Private practice, Rio de Janeiro, Rio de Janeiro, Brazil. , Rio de Janeiro Rio de Janeiro , Brazil.
Julia Sotero
JS
Vianna
Postdoc resident, Universidade Federal do Rio de Janeiro (UFRJ), Department of Pediatric Dentistry and Orthodontics, Rio de Janeiro, Rio de Janeiro, Brazil. Dentist, Universidade Federal de Santa Maria (UFSM), Department of Restorative Dentistry, Santa Maria, Rio Grande do Sul, Brazil. , Universidade Federal do Rio de Janeiro, Universidade Federal do Rio de Janeiro, Department of Pediatric Dentistry and Orthodontics, Rio de Janeiro Rio de Janeiro , Brazil.
Mariana
M
Marquezan
PhD resident, Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Rio de Janeiro, Brazil. , Universidade Federal do Rio de Janeiro, Universidade Federal do Rio de Janeiro, Rio de Janeiro Rio de Janeiro , Brazil.
Thiago Chon Leon
TC
Lau
Professor, Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Rio de Janeiro, Brazil. , Universidade Federal do Rio de Janeiro, Universidade Federal do Rio de Janeiro, Rio de Janeiro Rio de Janeiro , Brazil.
Eduardo Franzotti
EF
Sant'Anna
D000818:Animals; D002417:Cattle; D003188:Composite Resins / Q000008:administration & dosage*; D001840:Dental Bonding / Q000379:methods*; D003731:Dental Caries / Q000628:therapy*; D066298:In Vitro Techniques; D016910:Orthodontic Brackets; D010895:Pit and Fissure Sealants; D019279:Resin Cements; D012117:Resins, Synthetic / Q000008:administration & dosage*; D033081:Shear Strength
C500418:Clinpro Sealant; D003188:Composite Resins; D010895:Pit and Fissure Sealants; D019279:Resin Cements; D012117:Resins, Synthetic; C477790:Transbond XT; C578177:icon infiltrant