Miguel Luciano Silva1, Leandro Tasso2, Alan Arrieira Azambuja3, Maria Antonia Figueiredo1, Fernanda Gonçalves Salum1, Vinicius Duval da Silva4, Karen Cherubini5,6. 1. Postgraduate Program of Dental College, Pontifical Catholic University of Rio Grande do Sul-PUCRS, Porto Alegre, RS, Brazil. 2. Postgraduate Program of Biotechnology, Laboratory of Pharmacology, University of Caxias do Sul-UCS, Caxias do Sul, RS, Brazil. 3. Department of Oncology, Hospital São Lucas, Pontifical Catholic University of Rio Grande do Sul-PUCRS, Porto Alegre, RS, Brazil. 4. Department of Pathology, Hospital São Lucas, Pontifical Catholic University of Rio Grande do Sul-PUCRS, Porto Alegre, RS, Brazil. 5. Postgraduate Program of Dental College, Pontifical Catholic University of Rio Grande do Sul-PUCRS, Porto Alegre, RS, Brazil. karen.cherubini@pucrs.br. 6. Serviço de Estomatologia, Hospital São Lucas-PUCRS, Av. Ipiranga, 6690/231, Porto Alegre, RS, 90610-000, Brazil. karen.cherubini@pucrs.br.
Abstract
OBJECTIVE: This study aimed to investigate the effect of hyperbaric oxygen therapy (HBOT) on tooth extraction sites in rats treated with bisphosphonate. MATERIALS AND METHODS: Rats were treated with zoledronic acid, subjected to tooth extractions and allocated into groups: (1) 7 days of HBOT, (2) 14 days of HBOT, (3) 7-day control, and (4) 14-day control. The site of tooth extractions was analyzed by histomorphometry and immunohistochemistry. RESULTS: On macroscopic analysis, HBOT did not significantly affect bone exposure volume either at 7 or 14 days. On hematoxylin and eosin (H&E) analysis, the 14-day HBOT group showed less non-vital bone compared to both controls and 7-day HBOT group. HBOT significantly lowered expression of vascular endothelial growth factor (VEGF), receptor activator NF-kB ligand (RANKL), bone morphogenetic protein-2 (BMP-2), and osteoprotegerin (OPG) at 7 days, compared to control, whereas at 14 days, there was no significant difference for these variables. CONCLUSION: HBOT can reduce the amounts of non-vital bone microscopically detected in tooth extraction sites of rats subjected to bisphosphonate therapy. The effect seems to occur in a dose-dependent mode. Further studies are required to clarify the mechanisms accounting for this effect. CLINICAL RELEVANCE: Treatment of bisphosphonate-related osteonecrosis of the jaw (BRONJ) has been a challenging task, where the effectiveness of HBOT is controversial. This study reports important effects of HBOT on the maxillae of rats subjected to bisphosphonate treatment, making an important contribution to the knowledge about the applicability of HBOT in BRONJ.
OBJECTIVE: This study aimed to investigate the effect of hyperbaric oxygen therapy (HBOT) on tooth extraction sites in rats treated with bisphosphonate. MATERIALS AND METHODS:Rats were treated with zoledronic acid, subjected to tooth extractions and allocated into groups: (1) 7 days of HBOT, (2) 14 days of HBOT, (3) 7-day control, and (4) 14-day control. The site of tooth extractions was analyzed by histomorphometry and immunohistochemistry. RESULTS: On macroscopic analysis, HBOT did not significantly affect bone exposure volume either at 7 or 14 days. On hematoxylin and eosin (H&E) analysis, the 14-day HBOT group showed less non-vital bone compared to both controls and 7-day HBOT group. HBOT significantly lowered expression of vascular endothelial growth factor (VEGF), receptor activator NF-kB ligand (RANKL), bone morphogenetic protein-2 (BMP-2), and osteoprotegerin (OPG) at 7 days, compared to control, whereas at 14 days, there was no significant difference for these variables. CONCLUSION: HBOT can reduce the amounts of non-vital bone microscopically detected in tooth extraction sites of rats subjected to bisphosphonate therapy. The effect seems to occur in a dose-dependent mode. Further studies are required to clarify the mechanisms accounting for this effect. CLINICAL RELEVANCE: Treatment of bisphosphonate-related osteonecrosis of the jaw (BRONJ) has been a challenging task, where the effectiveness of HBOT is controversial. This study reports important effects of HBOT on the maxillae of rats subjected to bisphosphonate treatment, making an important contribution to the knowledge about the applicability of HBOT in BRONJ.
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