Efeito do pré-aquecimento na microdureza superficial de seis resinas compostas
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Antecedentes: Resinas de pré-aquecimento demonstraram melhorar as propriedades físicas, como a microdureza superficial. Algumas resinas compostas de baixo custo não foram bem estudadas e o pré-aquecimento pode melhorar suas propriedades. Objetivo: avaliar se o pré-aquecimento aumenta a microdureza superficial de 6 resinas compostas e se a microdureza das resinas pré-aquecidas de baixo custo é igual à das demais resinas. Métodos: Nesta investigação experimental In vitro, foram utilizadas 6 resinas, EnaHri UE2® e UD2® ( Micerium, Gênova Itália) como controle, Z350TM e Z250TM (3M ESPE, Minnesota Estados Unidos) convencionalmente usaram resinas e LUNA® e ROK® (SDI, Victoria Austrália) como resinas de baixo custo. Amostras sem pré-aquecimento (sp) e pré-aquecimento a 39°C (p) foram feitas para cada resina. Foi polimerizado de acordo com as instruções dos fabricantes. Três medições foram feitas por amostra usando um testador de microdureza aplicando uma carga de 300 g por 10 segundos. Resultados: Microdureza resina-esmalte: LUNA® sp 69,93 HV (95 % CI 62,02-77,85), Z350TM sp 89,9 HV (95 % CI 80,56-99,23), LUNA® p 70,05 HV (95 % CI 62,97-77,12), Z350TM p 87,47 HV (CI 95 % 78,71-96,23). A microdureza das resinas-dentina: ROK® sp 85,16 HV (95 % CI 69,91-100,4), Z250TM sp 95,99 HV (95 % CI 74,8-117,2), ROK® p 92,19 HV (95 % CI 80,83-103,6), Z250TM p 104,7 HV (95 % CI 97,76-111,6). O pré-aquecimento não aumentou significativamente a microdureza, exceto para resinas controle. ROK® sp é equivalente a Z250TM sp (p 0,2825). Conclusão: O pré-aquecimento não aumenta a microdureza superficial das resinas compostas analisadas. A microdureza da resina ROK® sp é equivalente a Z350TM sp.
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