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Role of periodontal disease in bisphosphonate‐related osteonecrosis of the jaws in ovariectomized rats
Author(s) -
Li Chun Lei,
Lu Weijia William,
Seneviratne Chaminda Jayampath,
Leung Wai Keung,
Zwahlen Roger A.,
Zheng Li Wu
Publication year - 2016
Publication title -
clinical oral implants research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.407
H-Index - 161
eISSN - 1600-0501
pISSN - 0905-7161
DOI - 10.1111/clr.12502
Subject(s) - medicine , dental alveolus , ovariectomized rat , ligature , periodontitis , bisphosphonate , zoledronic acid , bone resorption , resorption , dentistry , molar , sham surgery , bone remodeling , osteoporosis , pathology , estrogen , alternative medicine
Abstract Objective This study aimed to investigate the role of progressive periodontal disease in inducing bisphosphonate‐related osteonecrosis of the jaws ( BRONJ ) using an ovariectomized ( OVX ) rat model mimicking human intracortical remodeling process. Materials and methods Thirty 12‐week‐old Spraque–Dawly ( SD ) female rats were randomly assigned into two groups. All rats underwent bilateral ovariectomy. Six weeks after surgery, zoledronic acid ( ZA ) or vehicle control was administered intraperitoneally for 12 weeks. On the same day of injection, a cotton ligature was placed subgingivally around the first left lower molar to induce periodontitis. All animals were sacrificed 12 weeks after injection. The entire mandibles were harvested for micro‐computed tomography (micro‐ CT ) and histological examinations. Results Micro‐ CT examination showed that ligature placement caused significant alveolar bone loss both in ZA (0.63 ± 0.13 vs. 0.38 ± 0.06 mm, P < 0.001) and in control (0.88 ± 0.19 vs. 0.40 ± 0.06 mm, P < 0.001) groups. Whereas in the ZA group, bone loss was attenuated compared with the control group ( P < 0.01); the bone mineral density in the ZA group (1.00 ± 0.02 g/cm 3 ) was significantly higher than that in vehicle control group (0.96 ± 0.03 g/cm 3 , P < 0.001). Histological examination found necrotic bone tissue with extensive, empty lacunae in two of 15 rats in ZA group, but in none of the control group. Conclusion Bisphosphonates inhibit alveolar bone resorption in progressive periodontal disease, which might benefit the management of periodontitis, but increase the risk of developing BRONJ .