Impact of Hyperbaric Oxygen on the Healing of Teeth Extraction Sockets and Alveolar Ridge Preservation
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The purpose of this study was to investigate the role of hyperbaric oxygen (HBO) in the healing of teeth extraction sockets and in alveolar ridge preservation. This may provide an experimental basis for the widespread application of HBO in oral implantation.
A total of 32 beagle dogs were included in the study and randomly divided equally between an HBO group treated with hyperbaric oxygen (100% O2, 2.4 atm, 90 min/day, 5 times/week, 6 weeks) and a normobaric oxygen (NBO) group treated with normal air in the same chamber. The lateral incisors of the maxillary and mandible of each dog were extracted, and the right upper and lower incisor extraction sockets (A2C2) were allowed to heal naturally, while left upper and lower incisor sockets (B2D2) received implants of a commercial bone substitute. At 4 and 8 weeks after surgery, clinical observation, cone-beam computerized tomography (CBCT), histomorphology observation, and expression levels of vascular endothelial growth factor (VEGF) and bone morphogenetic protein 2 (BMP-2) were analyzed to evaluate new bone formation, mineralization, and reconstruction.
After 4 and 8 weeks, bone width and lip contour of the extraction socket in the NBO group were significantly reduced and collapsed in comparison with the HBO group. CBCT showed that the difference in vertical height between the alveolar crest of the labial tongue and palatal side of the extraction sockets was smaller in the HBO than NBO group. There was a significant difference in new bone formation (P < 0.05) and bone mineral density (P < 0.05) between the HBO and NBO groups, and the HBO group showed significantly greater new bone and bone reconstruction based on histology. Furthermore, the expression levels of VEGF and BMP-2 were higher in the HBO group.
HBO reduced bone resorption and promoted early bone formation, bone mineralization, and reconstruction in the extraction sockets. HBO greatly reduced the healing time of the extraction sockets and promoted alveolar ridge preservation, thus showing promise for the clinic.
KeywordsHyperbaric oxygen Bone healing Teeth extraction sockets Alveolar ridge preservation
Liao Juan: Designed and performed the experiments and collected and analyzed the data. Ren Jing: Designed the experiments, analyzed the data, and wrote the manuscript. Qing Wei: Assisted in the animal experiments, collected the data, and revised the manuscript. Li Peng: Took part in the animal experiments and data collection. Mu Yan-dong: Designed the experiments, determined the research methods, and analyzed the data.
The work was supported by the Science Research Subject of the Sichuan Academy of Medical Sciences & Sichuan Provincial People’s Hospital (Chengdu, China).
Compliance with ethical standards
Conflicts of Interest
The authors declare that they have no conflict of interest.
The Ethics Committee of the Sichuan Academy of Medical Sciences & Sichuan Provincial People’s Hospital approved the study protocol. The Ethics Committee of Sichuan Provincial People’s Hospital approved the experiment on May 19, 2017 [approval no. Ethics (Research), No. 130 in 2017]. The study complies with all recommended principles for the care and use of animals.
Not applicable to this animal study.
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