Avaliação in vitro da resistencia ao cisalhamento de braquetes metalicos com e sem composito incorporado a base e cimentos de ionomero de vidro com variação da superficie de esmalte

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

The aim of this study was to evaluate the shear bond strength from orthodontic brackets (Victory Series) bonded with composites (APC II and APC Plus) and resin-modified glass ionomer cements (Fuji Ortho LC and Fuji Ortho Band) applied on bovine enamel surface under different enamel conditions (either dry or moisten with distilled water). The adhesive remnant index (ARI) was evaluated after the bracket removal. Two hundred and forty mandibular incisors were included into PVC tubes with chemically activated acrylic resin leaving the vestibular face of perpendicularly to the botton plane of the tube. The vestibular face of all the teeth were cleared with nonfluoridated pumice and water for 10 seconds, washed 10 seconds, dried for the same time and divided into 16 groups (n = 15): Group 1 ? enamel etched with 37% phosphoric acid, washed and dried + Transbond XT primer + APC II; Group 2 ? enamel etched with 37% phosphoric acid, washed and dried + enamel moistened with distilled water + Transbond XT primer + APC II; Group 3 ? dried enamel + Transbond Plus Self Etching Primer + APC II; Group 4 ? enamel moistened with distilled water + Transbond Plus Self Etching Primer + APC II; Groups 5 to 8 ? enamel surface treatment similar to those from Groups 1 to 4, but brackets bonded with APC Plus; Groups 9 to 12 ? enamel surface treatment similar to those from Groups 1 to 4, but brackets bonded with glass ionomer cement (Fuji Ortho LC); Groups 13 to 16 ? enamel surface treatment similar to those from Groups 1 to 4, but brackets bonded with glass ionomer cement (Fuji Ortho Band). After the bonding procedures, all samples were stored in distilled water at 37oC for 24 hours, followed by 500 thermocycle between 5 and 55oC, during 30 seconds. The shear bond strength was performed using an Instron universal testing machine (model 4411) at a crosshead speed of 0.5 mm/min. The values were submitted to ANOVA and Tukey?s test (5%) and showed that, regardless of the enamel surface treatment, the shear bond strength values concerning the APC Plus were statistically greater than those obtained by using Fuji Ortho LC, APC II or Fuji Ortho Band material. Regardless of the bonding material, it was observed no statistical difference between the four enamel surface treatments. In relation to the adhesive remnant index, no influence was observed for the different treatments using APC II, APC Plus or Fuji Ortho LC material. In relation to the Fuji Ortho Band material, however, the conventional treatment using Transbond Plus Self-Etching Primer (TPSEP) showed a better ARI score for the dental structure than the other treatments. In addition, the conventional treatments using APC Plus and Fuji Ortho LC materials for moistened enamel surface showed the highest ARI scores. Regardless of the material used, the Transbond Plus Self- Etching Primer conventionally used showed no difference. On the other hand, the Transbond Plus Self-Etching Primer used under moistened condition showed the highest ARI scores for both APC Plus and Fuji Ortho LC materials

ASSUNTO(S)

glass ionomer cements cimentos de ionomeros de vidro resistencia ao cisalhamento orthodontic brackets colagem dentaria shear strength braquetes metalicos dental bonding

ACESSO AO ARTIGO

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