Effect of hyperbaric oxygen therapy on tooth extraction sites in rats subjected to bisphosphonate therapy—histomorphometric and immunohistochemical analysis

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 d...

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Published in:Clinical oral investigations 2017, Vol.21 (1), p.199-210
Main Authors: Silva, Miguel Luciano, Tasso, Leandro, Azambuja, Alan Arrieira, Figueiredo, Maria Antonia, Salum, Fernanda Gonçalves, da Silva, Vinicius Duval, Cherubini, Karen
Format: Article
Language:English
Subjects:
Animals
Bisphosphonate-Associated Osteonecrosis of the Jaw - metabolism
Bisphosphonate-Associated Osteonecrosis of the Jaw - prevention & control
Bone Density Conservation Agents - pharmacology
Bone Morphogenetic Protein 2 - metabolism
Dentistry
Diphosphonates - pharmacology
Hyperbaric Oxygenation
Imidazoles - pharmacology
Immunohistochemistry
Medicine
Original Article
Osteoprotegerin - metabolism
RANK Ligand - metabolism
Rats
Tooth Extraction
Vascular Endothelial Growth Factor A - metabolism
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Summary: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.
ISSN:1432-6981
1436-3771
DOI:10.1007/s00784-016-1778-3