Morphologic study of tissue changes occurring in the apical third and periapex of rat molars after endodontic treatment performed under different occlusal conditions / Estudo morfológico das mudanças teciduais ocorridas no terço apical e periápice dos molares de ratos após o tratamento endodôntico reaizado sob diferentes condições

ABSTRACT

The purpose of the present study was to carry out a histologic study of the periapical changes of the maxillary first molar of rats submitted to endodontic treatment under different occlusal conditions. The experiment carried out under conditions analogous to those used in clinical practice. Pulpotomy, pulpectomy and chemomechanical preparationm of the mesial root canal were carried out according to previously established techniques and the mesial root canal was filled with cement and guta-percha. A glass ionomer cement was used as restorative material under conditions of subocclusion, normal occlusion and excessive occlusal forces. No inflammatory reaction of periapical tissue was observed under the three conditions used, and active closing of the root canal was observed 15 days after the procedure, with the formation of cementum replacing the pulpar remmant