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Força de adesão de brackets ortodônticos em dentes decíduos utilizando diferentes tipos de adesivos
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Abstract(s)
Objetivo: Comparar a força de adesão de brackets ortodônticos utilizando os adesivos Assure® Plus All e o Transbond™ XT, em dentes decíduos e permanentes.
Materiais e Métodos: Foram selecionados 22 molares decíduos e 22 pré-molares hígidos e divididos em quatro grupos de 11 dentes aos quais foram colados brackets ortodônticos metálicos utilizando o Transbond™ XT e o Assure® Plus All. Em todos os grupos foi utilizada a pasta adesiva Transbond™ XT. Posteriormente, a amostra foi sujeita à termociclagem a 10.000 ciclos em água entre os 5ºC e os 55ºC e submetida ao teste de cisalhamento, à velocidade de 1mm/min. O local de falha de adesão foi determinado através do Índice de Remanescente Adesivo (ARI). Na análise estatística foi utilizada a ANOVA Two-way e o teste Kruskal-Wallis (p ≤ 0,05).
Resultados: A força média de resistência ao cisalhamento para o Assure® Plus All nos dentes decíduos e permanentes foi de 7,87 ± 1,72 MPa e 8,04 ± 1,36 MPa, respetivamente. Valores muito semelhantes aos obtidos com o Transbond™ XT para dentes decíduos (6,72 ± 1,02 MPa) e permanentes (8,22 ± 1,45 MPa). Quanto ao ARI, todos os grupos obtiveram pontuação de 2, à exceção do grupo onde foi utilizado o Transbond™ XT em dentes permanentes, onde se obteve a pontuação de 1.
Conclusão: Não se verificaram diferenças estatisticamente significativas na força de adesão a dentes permanentes e a dentes decíduos colados com Assure® Plus All e Transbond™ XT. Ainda assim, obtiveram-se forças de adesão mais elevadas com o Assure® Plus All do que com o Transbond™ XT na dentição decídua, valores esses inferiores comparativamente à dentição permanente. No ARI, com o Transbond™ XT em dentes permanentes, a falha de adesão ocorreu predominantemente na interface esmalte-adesivo, contrariamente aos restantes grupos onde a falha de adesão ocorreu predominantemente na interface adesivo-bracket.
Purpose: To compare the bond strength of orthodontic brackets using Assure® Plus All and Transbond™ XT adhesive, in primary and permanent teeth. Materials and Methods: 22 primary molars and 22 premolars were selected and divided into four groups of 11 teeth to which metal orthodontic brackets were bonded using Transbond™ XT and Assure® Plus All. Transbond™ XT adhesive paste was used in all groups. Subsequently, the sample was exposed to thermocycling at 10,000 cycles in water between 5ºC and 55ºC and subjected to the shear test, at a crosshead speed of 1mm/min. The site of bonding failure was determined using the Adhesive Remnant Index (ARI). Two-way ANOVA and Kruskal-Wallis test (p≤0.05) were used in the statistical analysis. Results: The shear bond strength for deciduous and permanent teeth bonded with Assure® Plus All averaged 7.87 ± 1.72 MPa and 8.04 ± 1.36 MPa, respectively. The values were very similar to those obtained with Transbond™ XT for deciduous (6.72 ± 1.02 MPa) and permanent teeth (8.22 ± 1.45 MPa). Regarding ARI, all groups scored 2, except for the group with permanent teeth bonded with Transbond™ XT, where the score was 1. Conclusion: No statistically significant differences in shear bond strength were observed in permanent and primary teeth bonded with Assure® Plus All and Transbond™ XT. Nevertheless, higher bond strength were obtained with Assure® Plus All than with Transbond™ XT in the deciduous teeth, which were lower compared to the permanent teeth. In ARI, with Transbond™ XT in permanent teeth, adhesion failure occurred predominantly in the enamel-adhesive interface, contrary to the other groups where adhesion failure occurred predominantly in the adhesive-bracket interface.
Purpose: To compare the bond strength of orthodontic brackets using Assure® Plus All and Transbond™ XT adhesive, in primary and permanent teeth. Materials and Methods: 22 primary molars and 22 premolars were selected and divided into four groups of 11 teeth to which metal orthodontic brackets were bonded using Transbond™ XT and Assure® Plus All. Transbond™ XT adhesive paste was used in all groups. Subsequently, the sample was exposed to thermocycling at 10,000 cycles in water between 5ºC and 55ºC and subjected to the shear test, at a crosshead speed of 1mm/min. The site of bonding failure was determined using the Adhesive Remnant Index (ARI). Two-way ANOVA and Kruskal-Wallis test (p≤0.05) were used in the statistical analysis. Results: The shear bond strength for deciduous and permanent teeth bonded with Assure® Plus All averaged 7.87 ± 1.72 MPa and 8.04 ± 1.36 MPa, respectively. The values were very similar to those obtained with Transbond™ XT for deciduous (6.72 ± 1.02 MPa) and permanent teeth (8.22 ± 1.45 MPa). Regarding ARI, all groups scored 2, except for the group with permanent teeth bonded with Transbond™ XT, where the score was 1. Conclusion: No statistically significant differences in shear bond strength were observed in permanent and primary teeth bonded with Assure® Plus All and Transbond™ XT. Nevertheless, higher bond strength were obtained with Assure® Plus All than with Transbond™ XT in the deciduous teeth, which were lower compared to the permanent teeth. In ARI, with Transbond™ XT in permanent teeth, adhesion failure occurred predominantly in the enamel-adhesive interface, contrary to the other groups where adhesion failure occurred predominantly in the adhesive-bracket interface.
Description
Dissertação para obtenção do grau de Mestre no Instituto Universitário Egas Moniz
Keywords
Força de resistência ao cisalhamento Adesão de brackets Dentes decíduos Força de adesão Esmalte decíduo