Esteves JC. Tooth Replantation after root canal filling with calcium hydroxide paste associated to MTA apical plug. Histological study in rats.[dissertation].
UNESP -Univ. Estadual PaulistaThe aim of this study was to assess the repair process of late reimplant of rat teeth after root canal filling with calcium hydroxide paste and MTA apical plug. Forty rats were divided into 4 groups of 10 animals each. In all of animals the upper right incisors were extracted. Group I, the teeth were reimplanted in the socket, immediately. In the other groups, the teeth were kept in a dry environment for 60 minutes. Then, the dental papilla, enamel organ, pulp and periodontal ligament were removed. Subsequently, were immersed in a solution of sodium fluoride acid phosphate for 10 minutes. After these procedures the root canal were filled in Group II with sterile saline solution, Group III, with calcium hydroxide paste and Group IV, with calcium hydroxide paste and MTA apical plug. The animals were sacrificed at 60 days after surgery and the specimens were analyzed histologically and histometrically. The results showed the Group I presented the best pattern of repair and rehabilitation of periodontal reattachment and periapical repair. Group IV presented a lower incidence of inflammatory resorption when compared to Groups II and III (p <0.05). There was more replacement resorption in Group IV compared to Group I (p <0.05). The analysis of total resorption, the Groups II and III were more affected than Group I (p <0.05). In Group IV, the periapical region showed fibrous tissue well-vascularized with areas of mineralized tissue formation in nine specimens next to the MTA. Based on these results, we conclude that the calcium hydroxide paste associated with the MTA apical plug produced favorable results in dental reimplantation related to inflammatory resorption and periapical tissue repair.