title: Dye leakage and SEM study of roots obturated with Thermafill and dentin bonding agent.
abstract: The apical seal of roots obturated with a dentin bonding agent and Thermafill with and without the use of sodium hypochlorite as an irrigating solution was compared by a dye leakage test. Roots obturated with Thermafill and a zinc oxide eugenol sealer were used as controls. Thirty-eight roots were prepared chemomechanically and divided into three experimental groups. The teeth of group 1 were filled with Thermafill and the dentin bonding agent using sodium hypochlorite as the irrigant. The teeth of group 2 were filled in the same way, but saline solution was used as the irrigant. Before the root canal was filled the smear layer was removed from the root canal walls of both groups by rinsing the root canal with a 17% EDTA solution. The teeth of group 3 were filled with Thermafill and a zinc oxide eugenol sealer. The teeth were immersed in 2% methylene blue solution. The root fillings of groups 1 and 2 leaked significantly more than those of group 3. The resin-dentin-guttapercha interface of group 1 was observed by scanning electron microscopy and showed a typical hybrid layer. An intimate contact between resin and dentin was present in group 2, but a resin-dentin interdiffusion zone was only occasionally observed. The use of dental adhesives and the hybrid layer formation did not improve the seal of Thermafill root canal fillings.
authors.affiliation: Istituto Policattedra Discipline Odontostomatologiche Università Degli Studi di Siena, Italy.
authors.forename: F
authors.initials: F
authors.lastname: Mannocci
authors.forename: M
authors.initials: M
authors.lastname: Innocenti
authors.forename: E
authors.initials: E
authors.lastname: Bertelli
authors.forename: M
authors.initials: M
authors.lastname: Ferrari
mesh_terms: D004396:Coloring Agents; D003763:Dental Leakage / Q000175:diagnosis; D003804:Dentin / Q000648:ultrastructure; D017220:Dentin-Bonding Agents; D004492:Edetic Acid; D005069:Evaluation Studies as Topic; D006171:Gutta-Percha; D006801:Humans; D008751:Methylene Blue; D008855:Microscopy, Electron, Scanning; D012387:Root Canal Filling Materials; D012388:Root Canal Irrigants; D019227:Tooth Apex; D015035:Zinc Oxide-Eugenol Cement
chemical_list: D004396:Coloring Agents; D017220:Dentin-Bonding Agents; D012387:Root Canal Filling Materials; D012388:Root Canal Irrigants; D015035:Zinc Oxide-Eugenol Cement; D006171:Gutta-Percha; D004492:Edetic Acid; D008751:Methylene Blue