ABSTRACT
Objective @#To analyze and discuss the effect of 4 different surface treatment methods on the bonding effect between polymerization porcelain and metal bracket s.@*Methods@# 45 polymer-ceramics specimens were made and 40 of them were selected and randomly divided into 5 groups according to different surface treatment methods. A group:surface without special treatment. B group: 9.6% hydrofluoric acid gel combine with bonding agent, C group: 9.6% hydrofluoric acid gel combine with silane, D group: 35％ phosphoric acid gel combine with bonding agent, E group: 35％ phosphoric acid gel combine with silane. All specimens were stored in water for 24 hours at 37 ℃ after bonding 10 min utes and then cycled 500 cycles (5 ℃ to 55 ℃). To measure the shear bonding strength and record the damage cases and the adhesive remnant index.@*Results @#The shear strength values were: 3.24 in the control group, 7.24 MPa in the hydrofluoric acid etching treatment group. 10.78 MPa in the hydrofluoric acid gel combined with silane group. 4.17 MPa in the phosphoric acid-only group, 6.84 MPa in the phosphoric acid gel combined with silane group. The results of each group were statistically different from those of the other four groups (P < 0.001). The rate of breakage after the removal of brackets of the hydrofluoric acid gel combined with silane group is higher than the others. @*Conclusion @#As to the high shear bonding strength and low rate of breakage after the removal of brackets, we recommend 35% phosphoric acid etching combining with silane coupling agent in clinical.
ABSTRACT
Introducción: aunque el uso de braquets está destinado a mejorar la estética dental, también se asocia a reacciones negativas al requerir de aparatos fijos visibles que alteran la fisonomía, aspectos funcionales y de higiene oral del paciente. Esto podría determinar una baja adherencia al tratamiento ortodóncico. Objetivo: evaluar la satisfacción del paciente con brackets metálicos en relación con la higiene oral, confort y autopercepción estética en la primera y cuarta semana de tratamiento. Métodos: se desarrolló un estudio observacional, longitudinal, prospectivo de base individual. A partir del juicio de tres expertos se construyó un cuestionario de satisfacción para tratamiento ortodóncico basado en 10 preguntas referidas a las dimensiones de higiene oral, confort y autopercepción estética. Del universo de pacientes próximos a comenzar su tratamiento en el Instituto Nacional de Ortodoncia en Santiago de Chile, se estimó una muestra 45 individuos, según los antecedentes descritos por Caniklioglu. Fueron seleccionados por conveniencia, entre mayo y junio de 2012. Los criterios de inclusión consideraron hombres y mujeres mayores de 15 años. Se excluyó a quienes habían mantenido tratamientos ortodóncicos previos o que tuvieran enfermedades invalidantes para responder el cuestionario. Resultados: la confiabilidad final del cuestionario alcanzó un α= 0,769. El cambio en los puntajes entre la primera y segunda medición fue de 8,06 ± 1,65 a 10,82 ± 1,52 puntos en la dimensión de higiene oral; de 10,51 ± 2,2 a 15,42 ± 1,97 puntos en la de confort y de 8,64 ± 1,83 a 11,37 ± 1,64 puntos en la autopercepción estética. El puntaje total fue de 27,2 ± 4,48 puntos en la primera semana de tratamiento y de 37,6 ± 4,02 puntos en la cuarta semana. Conclusiones: el nivel de satisfacción general en pacientes chilenos portadores de braquets metálicos mejora de la primera a la cuarta semana de instalados los aparatos, así como en cada una de sus dimensiones: higiene oral, confort y autopercepción estética(AU)
Introduction: although brackets are intended to improve dental esthetics, they are also associated with negative reactions, due to the need to use visible fixed appliances altering the patient's physiognomy, functional capacity and oral hygiene. This could lead to low adherence to orthodontic treatment. Objective: evaluate patient satisfaction with metal brackets in relation to oral hygiene, comfort and esthetic self-perception in the first and fourth weeks of treatment. Methods: an longitudinal prospective observational study was conducted on an individual basis. Starting from the judgment of three experts, an orthodontic treatment satisfaction questionnaire was developed based on 10 questions about the variables oral hygiene, comfort and esthetic self-perception. From the universe of patients about to start treatment at the National Institute of Orthodontics in Santiago de Chile, a sample of 45 individuals was selected applying the antecedents described by Caniklioglu. Participants were selected by convenience between May and June 2012. All male and female patients aged over 15 years were included, except for those who had undergone previous orthodontic treatment or suffered from conditions preventing them from answering the questionnaire. Results: final reliability of the questionnaire was α= 0.769. Score variation between the first and the second measurement was 8.06 ± 1.65 to 10.82 ± 1.52 points for oral hygiene, 10.51 ± 2.2 to 15.42 ± 1.97 points for comfort and 8.64 ± 1.83 to 11.37 ± 1.64 points for esthetic self-perception. Total score was 27.2 ± 4.48 points for the first week of treatment and 37.6 ± 4.02 points for the fourth week. Conclusions: overall satisfaction among Chilean patients wearing metal brackets improves from the first to the fourth week after installation of the appliance. This applies to all three dimensions: oral hygiene, comfort and esthetic self-perception(AU)