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Diferentes formas de adesão de brackets a superfícies de amálgama
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Objetivo: A colagem de brackets a uma superfície dentária restaurada com amálgama continua a ser um desafio para os ortodontistas. Este estudo teve como objetivo avaliar e comparar a força de adesão de brackets metálicos a amálgama, usando três sistemas adesivos e duas técnicas de preparação de superfície.
Materiais e métodos: A 60 dentes pré-molares naturais, foi talhada uma caixa vestibular restaurada com amálgama. Esta amostra foi dividida em seis grupos de 10 amostras cada. Em todos foram colados brackets metálicos de pré-molares usando pasta do sistema adesivo Transbond™XT. Aos Grupos 1, 2 e 3, com preparação micromecânica com broca de turbina de gão grosso, foram aplicados os adesivos Transbond™XT, Assure®Plus All e Metal Primer Reliance®+Transbond™XT respetivamente, e os Grupos 4, 5 e 6,
preparados com jato de óxido de alumínio, foram sujeitos à mesma sequência de adesivos. Calculou-se a resistência ao cisalhamento através de máquina de testes universal (velocidade de 1mm/min). A falha de adesão determinou-se através do índice de remanescente adesivo. Na análise estatística foi utilizada ANOVA Two-way e o teste Kruskal-Wallis (p≤0,05).
Resultados: Verificaram-se diferenças estatisticamente significativas na resistência ao cisalhamento entre os diferentes sistemas adesivos e tratamentos de superfície (p<0,05). O tratamento com óxido de alumínio aumentou significativamente a força de adesão entre o bracket e a amálgama (p≤0,05). Os maiores valores de resistência de adesão foram observados com o Assure®Plus All e o Metal Primer®+Transbond™XT (p≤0,05). O índice de remanescente adesivo revelou uma falha mista predominante na interface
adesivo-amálgama para todos os grupos, sem diferenças significativas entre os três adesivos examinados.
Conclusões: Os resultados obtidos são indicadores que uma maior força de adesão é obtida quando a superfície de amálgama é preparada com óxido de alumínio e são utilizados os sistemas adesivos Assure®Plus All ou Metal Primer®+Transbond™XT.
Aim: Bonding brackets to a tooth surface restored with amalgam continue to be challenging to orthodontists. Therefore, this study aimed to evaluate and compare the shear bond strength of stainless steel brackets bonded to amalgam restorations using each of three intermediate adhesives and two surface preparation techniques. Materials and Methods: Sixty extracted natural premolars were restored with amalgam fillings on their vestibular surface. The sample was divided equally to six groups; group 1, 2 and 3, were micro-mechanically treated with a coarse-grained diamond turbine bur, and group 4, 5 and 6 were treated with sandblasting. Metallic premolar brackets were bonded onto all teeth using Transbond™XT composite paste. The adhesives applied on group 1, 2 and 3 were; Transbond™XT, Assure®Plus All and Metal Primer Reliance®+Transbond™XT respectively. Group 4, 5 and 6 were exposed to the same former sequence of adhesives separately. The shear bond strength was calculated using Universal test machine, at 1mm/min. Adhesion failure was determined using the Adhesive Remnant Index. Descriptive statistics, Two-way ANOVA and the Kruskal-Wallis tests were undertaken at p≤0.05. Results: There were statistically significant differences of shear bond strength among the different adhesives and surface treatment methods (p<0.05). The use of sandblasting treatment significantly increased the shear bond strength between the bracket and the amalgam (p≤0,05). The highest bond strength value was observed with the Assure® and Metal Primer®+Transbond™XT (p<0,05). The adhesive remnant index revealed a predominant mixed failure at the amalgam-adhesive interface for all groups with no significant differences between the three examined adhesives (p≤0,05). Conclusions: The results obtained are indicators that greater shear bond strength is obtained when the amalgam surface is prepared with aluminum oxide and Assure®Plus All or Metal Primer®+Transbond™XT adhesive systems are used.
Aim: Bonding brackets to a tooth surface restored with amalgam continue to be challenging to orthodontists. Therefore, this study aimed to evaluate and compare the shear bond strength of stainless steel brackets bonded to amalgam restorations using each of three intermediate adhesives and two surface preparation techniques. Materials and Methods: Sixty extracted natural premolars were restored with amalgam fillings on their vestibular surface. The sample was divided equally to six groups; group 1, 2 and 3, were micro-mechanically treated with a coarse-grained diamond turbine bur, and group 4, 5 and 6 were treated with sandblasting. Metallic premolar brackets were bonded onto all teeth using Transbond™XT composite paste. The adhesives applied on group 1, 2 and 3 were; Transbond™XT, Assure®Plus All and Metal Primer Reliance®+Transbond™XT respectively. Group 4, 5 and 6 were exposed to the same former sequence of adhesives separately. The shear bond strength was calculated using Universal test machine, at 1mm/min. Adhesion failure was determined using the Adhesive Remnant Index. Descriptive statistics, Two-way ANOVA and the Kruskal-Wallis tests were undertaken at p≤0.05. Results: There were statistically significant differences of shear bond strength among the different adhesives and surface treatment methods (p<0.05). The use of sandblasting treatment significantly increased the shear bond strength between the bracket and the amalgam (p≤0,05). The highest bond strength value was observed with the Assure® and Metal Primer®+Transbond™XT (p<0,05). The adhesive remnant index revealed a predominant mixed failure at the amalgam-adhesive interface for all groups with no significant differences between the three examined adhesives (p≤0,05). Conclusions: The results obtained are indicators that greater shear bond strength is obtained when the amalgam surface is prepared with aluminum oxide and Assure®Plus All or Metal Primer®+Transbond™XT adhesive systems are used.
Descrição
Dissertação para obtenção do grau de Mestre no Instituto Universitário Egas Moniz
Palavras-chave
Amálgama Bracket ortodôntico Adesivo Preparação de superfície