Efecto del precalentamiento en la microdureza superficial de seis resinas compuestas
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Antecedentes: El precalentamiento de las resinas ha demostrado mejorar propiedades físicas como la microdureza superficial. Algunas resinas compuestas de bajo costo no han sido muy estudiadas y el precalentamiento podría mejorar sus propiedades. Objetivo: evaluar si el precalentamiento aumenta la microdureza superficial de 6 resinas compuestas y si la microdureza de las de bajo costo precalentadas iguala a las otras resinas Método: En esta Investigación experimental In vitro se usaron 6 resinas, EnaHri UE2® y UD2® (Micerium, Génova Italia) como control, Z350TM y Z250TM (3M ESPE, Minnesota Estados Unidos) resinas de uso convencional y LUNA ® y ROK ® (SDI, Victoria Australia) como resinas de bajo costo. Se realizaron especímenes sin precalentar (sp) y precalentados a 39°C (p) para cada resina. Se polimerizó según indicaciones de los fabricantes. Se realizaron 3 mediciones por muestras usando un microdurómetro aplicando 300 g de carga por 10 segundos. Resultados: La microdureza de resinas-esmalte: LUNA ® sp 69.93 HV (IC 95 % 62.02-77.85), Z350TM sp 89.9 HV (IC 95 % 80.56-99.23), LUNA ® p 70.05 HV (IC 95 % 62.97-77.12), Z350TM p 87.47 HV (IC 95 % 78.71-96.23). La microdureza de resinas-dentina: ROK ® sp 85.16 HV (IC 95 % 69.91-100.4), Z250TM sp 95.99 HV (IC 95 % 74.8-117.2), ROK ® p 92.19 HV (IC 95 % 80.83-103.6), Z250TM p 104.7 HV (IC 95 % 97.76-111.6). El precalentamiento no aumentó significativamente la microdureza a excepción de las resinas control. ROK ® sp es equivalente a Z250TM sp (p 0.2825). Conclusiones: El precalentamiento no aumenta la microdureza superficial de las resinas compuestas analizadas. La microdureza de la resina ROK ® sp es equivalente a la Z350TM sp.
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