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RESUMEN. Antecedentes: El desarrollo de una nueva tecnica de obturacion denominada condensacion hibrida mixta, en la cual se modificada la tecnica de condensacion lateral en el tercio apical con un portador de calor, para una posterior inyeccion de gutapercha termoplastificada en los tercios restantes, implica establecer la interfase entre la dentina y el cemento sellador. Este parametro es clave para evitar la microfiltracion bacteriana y el fracaso del tratamiento endodontico. Objetivo: Comparar la interfase cemento sellador-dentina a diversas distancia del apice radicular, cuando se obturan los conductos con la tecnica de condensacion hibrida mixta y la tecnica de condensacion lateral. Metodos: se realizo un estudio experimental ex vivo en el que se utilizaron 40 premolares unirradiculares con curvaturas de poca a moderada, las cuales se estandarizaron en la porcion radicular a 16 mm y se conformaron endodonticamente con instrumental rotatorio. 20 dientes se obturaron con la tecnica de condensacion lateral y 20 con la tecnica de condensacion hibrida mixta. Las raices se seccionaron a 1 mm y 4 mm del apice radicular y la interfase se analizo con microscopia electronica de barrido. Resultados: Con la tecnica hibrida mixta se encontraron valores significativamente menores de interfase cemento sellador-dentina, tanto a 1 mm como a 4 mm del apice radicular, al compararse con la tecnica de condensacion lateral (p=0,05). Conclusion: La aplicacion de calor en la tecnica de condensacion hibrida mixta aumenta la masa de material semisolido y disminuye la interfase cemento sellador-dentina.ABSTRACT. Background: A new obturation technique named hybrid mixed technique (HMO) by modifying the lateral condensation (LC) at the apical third with a heat carrier and then making a back filling at the coronal third. It establishes a dentin-sealer interface that is important to avoid bacterial leakage and a future failure of the endodontic treatment. Objective: Compare dentin-sealer interface at different distances from root apex, using LC and HMO after biomechanical preparation. Method: This was an in vitro experimental study that used 40 recently extracted single-root premolars with moderated curvature. The roots were standardized at 16 mm and shaped with NiTi instruments. 20 root canals were filled using LC and 20 HMO obturation techniques. Roots were cut at 1 and 4 mm from the root apex and then analyzed under SEM. Results: Interface values using HMO technique were significantly lower at 1 mm and 4 mm from the apex when compared to LC (p=0.05). Conclusions: Application of heat through HMO increases the mass of the semi-solid material decreasing the amount of sealer and dentin-sealer interface.

universitas odontológica

Comparación de la interfase cemento sellador-dentina en dos técnicas de obturación: condensación lateral y condensación híbrida mixta / Comparison of Sealer-Dentin Interface in two Obturation Techniques: Lateral and Mixed Hybrid Condensation