Paulo J Palma1, João C Ramos2, João B Martins2, Anibal Diogenes3, Maria H Figueiredo2, Paula Ferreira4, Carlos Viegas5, João M Santos2. 1. Department of Dentistry, Faculty of Medicine, University of Coimbra, Coimbra, Portugal. Electronic address: ppalma@fmed.uc.pt. 2. Department of Dentistry, Faculty of Medicine, University of Coimbra, Coimbra, Portugal. 3. Department of Endodontics, University of Texas Health Science Center at San Antonio, San Antonio, Texas. 4. Chemical Process Engineering and Forest Products Research Centre (CIEPQPF), Department of Chemical Engineering, University of Coimbra, Coimbra, Portugal. 5. School of Agrarian and Veterinary Sciences, Department of Veterinary Sciences, Centre for the Research and Technology of Agro-Environmental and Biological Sciences, CITAB, University of Trás-os-Montes e Alto Douro - Quinta de Prados, Vila Real, Portugal.
Abstract
INTRODUCTION: The aim of this study was to evaluate histologically the newly formed tissues after regenerative endodontic procedures (REPs) in dogs using either a blood clot (BC) or 2 different formulations of a chitosan hydrogel as scaffolds. METHODS: Apical periodontitis was induced by inoculating immature teeth with oral plaque in 4 beagle dogs. Teeth (n = 96) were divided into 2 control (n = 20) and 4 test groups (n = 76) according to the treatment: apexification and REPs with BC, sodium hyaluronate:chitosan (HA:CS) scaffolds, or pectin:chitosan (P:CS) scaffolds. All root canals were disinfected with 2.5% sodium hypochlorite and a triple antibiotic paste intracanal medicament before evoked bleeding, clot formation, or scaffold placement. Thirteen weeks after treatment, the animals were sacrificed and the jaw blocks harvested for histologic processing, histomorphometric analysis, and statistical analysis. RESULTS: The lumens of the root canals were completely filled with mineral trioxide aggregate with evidence of a mineralized apical bridge between the root canal walls in 83% of the samples in the apexification group. Vital vascularized tissue was found in the REP groups; apical closure happened in 66.7% of these treatments, and root growth was detected more often as an increase in thickness (85.6%) than in length (45.6%). The greatest amount of mineralized tissue inside the canal was observed in the BC group, with statistical significance compared with the HA:CS and P:CS groups (P < .05). Further histologic evaluation revealed the presence of apical papilla. CONCLUSIONS: The addition of chitosan scaffolds to blood in regenerative procedures in dogs did not improve the formation of new mineralized tissues along the root canal walls or the histologic evidence of the regeneration of a pulp-dentin complex.
INTRODUCTION: The aim of this study was to evaluate histologically the newly formed tissues after regenerative endodontic procedures (REPs) in dogs using either a blood clot (BC) or 2 different formulations of a chitosan hydrogel as scaffolds. METHODS: Apical periodontitis was induced by inoculating immature teeth with oral plaque in 4 beagle dogs. Teeth (n = 96) were divided into 2 control (n = 20) and 4 test groups (n = 76) according to the treatment: apexification and REPs with BC, sodium hyaluronate:chitosan (HA:CS) scaffolds, or pectin:chitosan (P:CS) scaffolds. All root canals were disinfected with 2.5% sodium hypochlorite and a triple antibiotic paste intracanal medicament before evoked bleeding, clot formation, or scaffold placement. Thirteen weeks after treatment, the animals were sacrificed and the jaw blocks harvested for histologic processing, histomorphometric analysis, and statistical analysis. RESULTS: The lumens of the root canals were completely filled with mineral trioxide aggregate with evidence of a mineralized apical bridge between the root canal walls in 83% of the samples in the apexification group. Vital vascularized tissue was found in the REP groups; apical closure happened in 66.7% of these treatments, and root growth was detected more often as an increase in thickness (85.6%) than in length (45.6%). The greatest amount of mineralized tissue inside the canal was observed in the BC group, with statistical significance compared with the HA:CS and P:CS groups (P < .05). Further histologic evaluation revealed the presence of apical papilla. CONCLUSIONS: The addition of chitosan scaffolds to blood in regenerative procedures in dogs did not improve the formation of new mineralized tissues along the root canal walls or the histologic evidence of the regeneration of a pulp-dentin complex.
Authors: Diana B Sequeira; Ana Rafaela Oliveira; Catarina M Seabra; Paulo J Palma; Carlos Ramos; Maria H Figueiredo; Ana C Santos; Ana L Cardoso; João Peça; João Miguel Santos Journal: Clin Oral Investig Date: 2021-02-25 Impact factor: 3.573
Authors: Paulo J Palma; Joana A Marques; Márcia Antunes; Rui I Falacho; Diana Sequeira; Luís Roseiro; João Miguel Santos; João C Ramos Journal: Clin Oral Investig Date: 2020-10-12 Impact factor: 3.573
Authors: Marco C Bottino; Maria T P Albuquerque; Asma Azabi; Eliseu A Münchow; Kenneth J Spolnik; Jacques E Nör; Paul C Edwards Journal: J Biomed Mater Res B Appl Biomater Date: 2018-10-03 Impact factor: 3.368