Extensión de brecha marginal y composición elemental de materiales de protección pulpar bajo restauraciones con resina compuesta después del envejecimiento hidrolítico: Estudio in vitro
DOI:
https://doi.org/10.15517/343f5h58Palabras clave:
Complejo dentino-pulpar; Protección pulpar; Extensión de brecha marginal; Envejecimiento hidrolítico; Microscopía electrónica de barrido; Espectroscopía de energía dispersiva.Resumen
Este estudio evaluó la extensión de brecha marginal de materiales utilizados para la protección del complejo dentino-pulpar y la influencia de la degradación hidrolítica en la formación de brechas marginales en cavidades Clase V restauradas con resina compuesta. Se utilizaron cuarenta molares humanos extraídos, en los que se confeccionaron cavidades Clase V estandarizadas en las superficies vestibular y lingual. Las cavidades fueron restauradas con diferentes materiales de protección pulpar: cemento a base de silicato de calcio (Theracal LC), hidróxido de calcio con componentes resinosos (Ultrablend Plus y Calcimol LC), cemento ionómero de vidrio modificado con resina (Ionoseal) e hidróxido de calcio convencional (Hydro C), aplicados con un espesor de 0,5 mm, seguidos de un sistema adhesivo universal y resina compuesta. Los especímenes se almacenaron en saliva artificial durante 24 horas o 30 días y se sometieron a termociclado. La formación de brechas marginales se analizó mediante microscopía electrónica de barrido utilizando réplicas de resina epóxica, y la extensión de las brechas se midió con el software ImageJ. Los datos se analizaron mediante el test de Shapiro-Wilk, ANOVA de dos vías (Material x Tiempo) y la prueba post hoc de Tukey (P=0,05). La extensión de brecha marginal varió según el tipo de material utilizado. Los materiales con menor contenido resinoso tendieron a presentar menores brechas marginales, mientras que aquellos con mayor concentración de resina se asociaron con mayor formación de brechas. La degradación hidrolítica influyó en materiales específicos a lo largo del tiempo, y el sistema adhesivo pareció contribuir a mantener el sellado marginal.
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Derechos de autor 2026 Natália Marcomini, Joatan Lucas de Sousa Gomes Costa, Wilfredo G. Escalante-Otárola, Gabriela M. Castro-Núñez, Andréa Abi Rached Dantas, Milton Carlos Kuga.
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