RESUMEN
OBJECTIVE: To investigate the apical sealing ability of glass ionomer and resin-based root canal obturation systems in comparison to a conventional vertical compaction of warm guttapercha. METHODS: Forty-five extracted human teeth were randomly assigned into 3 groups of 15 each: a resin-based (EndoRez), a glass ionomer-based (Activ GP), and a conventional gutta-percha plus pulp sealer obturation system (GP/EWT). Apical and root canal space sealing abilities were assessed on five cross-sections 1.0 mm apart starting from the apex. Cross-section images were analysed using a focus-variation 3D scanning microscope and unsealed space was calculated as the percentage of total root canal space occupied by voids and debris. RESULTS: EndoRez had significantly higher rate of apical leakage and deeper dye penetration as compared to GP/EWT and Activ GP. EndoRez group had also more voids and debris (22.5%) in the root canal spaces as compared to GP/EWT (10.5%) and Activ GP (10.8%). Apical leakages occurred not only along the root canal walls, but also along the gutta-percha cones with EndoRez as a result of significant polymerisation shrinkage of the resin sealer. CONCLUSION: Resin-based EndoRez did not form an adequate apical seal of filled root canals. Glass ionomer-based Activ GP was comparable to a vertical compaction of warm guttapercha plus EWT sealer in sealing root canal spaces.
Asunto(s)
Recubrimiento Dental Adhesivo , Cavidad Pulpar/ultraestructura , Cementos de Ionómero Vítreo/química , Cementos de Resina/química , Materiales de Obturación del Conducto Radicular/química , Obturación del Conducto Radicular/métodos , Ápice del Diente/ultraestructura , Resinas Acrílicas/química , Anatomía Transversal , Colorantes , Resinas Compuestas/química , Filtración Dental/clasificación , Gutapercha/química , Humanos , Imagenología Tridimensional/métodos , Ensayo de Materiales , Microscopía/métodos , Polimerizacion , Preparación del Conducto Radicular/instrumentación , Preparación del Conducto Radicular/métodos , Propiedades de Superficie , Cemento de Óxido de Zinc-Eugenol/químicaRESUMEN
PURPOSE: The mandibular incisive canal (MIC) is the anterior extension of the mandibular canal and its presence is of interest in surgical procedures in the chin region. The aim of this study was to investigate the presence of a MIC in panoramic radiographs (OPGs). METHODS: One thousand forty-five OPGs were randomly chosen from patient population. The data collected included patient characteristics and MIC presence/absence according to the type of the dentition. Measurements (in mm) were performed evaluating the following: (A) minimum and (B) maximum distance from the alveolar ridge; (C) thickness and (D) length of the canal; and (E) distance (in bilateral cases) between the canals. RESULTS: The MIC was found in 2.7% of the patients. CONCLUSIONS: This study demonstrates the frequency of the MIC in OPGs and suggests that this anatomical structure should be considered to prevent injury during surgery.
