Effect of enamel etching on tensile bond strength of brackets bonded in vivo with a resin-reinforced glass ionomer cement.
OBJECTIVE
To evaluate the influence of enamel etching on tensile bond strength of orthodontic brackets bonded with resin-reinforced glass ionomer cement.


METHODS
The sample group consisted of 15 patients who had indications for extraction of four premolars for orthodontic reasons, equally divided into two different groups according to bracket and enamel preparation. Brackets were bonded in vivo, by the same operator, using a split mouth random technique: Group 1 (control), phosphoric acid + Fuji Ortho LC; Group 2, Fuji Ortho LC without acid conditioning. The teeth were extracted after 4 weeks using elevators. An Instron Universal Testing Machine was used to apply a tensile force directly to the enamel-bracket interface at a speed of 0.5 mm/min. The groups were compared using a Mann-Whitney U-test and Weibull analysis.


RESULTS
Mean results and standard deviations (in MPa) for the groups were: Group 1, 6.26 (3.21), Group 2, 6.52 (2.73). No significant difference was observed in the bond strengths of the two groups evaluated (P = .599).


CONCLUSIONS
Fuji Ortho LC showed adequate shear bond strength and may be suitable for clinical use.
Rosenbach
Gabriella
G
Department of Orthodontics, ABO-RS, Porto Alegre, Rio Grande do Sul, Brazil.
Cal-Neto
Julio Pedra e
JP
Oliveira
Silvio Rosan
SR
Chevitarese
Orlando
O
Almeida
Marco Antonio
MA
D000134:Acid Etching, Dental; D000180:Acrylic Resins; D000538:Aluminum Silicates; D001840:Dental Bonding / Q000379:methods; D017005:Dental Debonding; D003743:Dental Enamel / Q000187:drug effects; D003799:Dental Stress Analysis; D005899:Glass Ionomer Cements / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D016910:Orthodontic Brackets; D010756:Phosphoric Acids / Q000494:pharmacology; D018709:Statistics, Nonparametric; D016019:Survival Analysis; D013718:Tensile Strength
D000180:Acrylic Resins; D000538:Aluminum Silicates; C095451:Fuji Ortho LC; D005899:Glass Ionomer Cements; D010756:Phosphoric Acids; C030242:phosphoric acid