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Ortodontia ; 38(1): 10-15, jan.-mar. 2005. ilus, tab
Article in Portuguese | LILACS, BBO | ID: lil-542789

ABSTRACT

O objetivo neste estudo clínico prospectivo foi quantificar a freqüência de queda de braquetes metálicos durante o tratamento ortodôntico, quando utilizado o sistema adesivo Transbond Plus – Self-Etching Primer (SEP). A amostra foi composta por 278 dentes de 17 pacientes consecutivos, que realizaram tratamento ortodôntico regular na clínica de Ortodontia da USP. Os braquetes utilizados (Victory, slot .022”, prescrição MBT, 3M-Unitek) foram colados de forma direta sobre a face vestibular dos dentes superiores e inferiores, seguindo as orientações do fabricante. Uma vez iniciado o tratamento foram monitoradas as colagens durante 30 meses e registradas as quedas, causa da queda e a posição dos dentes nas arcadas. Os resultados indicam que houve 16 quedas, que representam 5,8% do total dos dentes considerados, observando-se maior incidência nos pré-molares (8,9%), seguida dos incisivos (6,5%) e nenhuma nos caninos. As causas em termos gerais dizem respeito ao excesso de força aplicada, mordendo itens que deveriam ter sido excluídos da dieta regular, conforme orientação inicial, com balas e pirulitos, entre outros. Com base nesses resultados podemos afirmar que o transbond Plus – Self-Etching Primer apresenta comportamento clinico semelhante ao descrito na literatura para os já consagrados sistemas de condicionamento do esmalte tradicionais, portanto se confirmando a sua perfeita confiabilidade no uso clinico.


Aim of this clinical prospective study was to quantify metallic bracket bonding failure during orthodontic treatment when used the adhesive system transbond Plus – Self-Etching Primer (SEP). 278 teeth of 17 consecutive patients undergoing regular orthodontic treatment in the orthodontics department of the University of Sao Paulo composed the sample. The brackets used in this study (Victory, slot 0.022”, MBT prescription, 3M-Unitek) were bonded directly on the buccal surface of the upper and lower teeth following the instructions given from the producer. Once the treatment started, the bonding of the bracket was monitored during 30 months. When the failure occurred, the cause and the position of the tooth were recorded. The results indicate that 16 brackets failure occurred, representing 5.8% of the 278 teeth, being the major bracket bonding failure percentage on the premolars (8.9%) followed by the incisors (6.5%). No bonding failure occurred on the cuspids. The main cause of the bonding failure was related to excess of force applied on the bracket chewing hard aliments (sweets) that should have been eliminated, as asked at the beginning of the treatment, from the regular diet. Based on these results we can state that Transbond Plus – self-Etching Primer shows a clinical behavior similar to the one described in the literature for the traditional bonding systems based on conventional acid etching of the enamel, confirming though is perfect reliability for the clinical use.


Subject(s)
Humans , Dental Bonding , Dentin-Bonding Agents , Materials Testing , Orthodontic Brackets , Dental Materials , Directly Observed Therapy
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