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https://hdl.handle.net/2440/70823
Type: | Journal article |
Title: | The presence of TNF-α and TNFR1 in aseptic root resorption. A preliminary study |
Other Titles: | The presence of TNF-alpha and TNFR1 in aseptic root resorption. A preliminary study |
Author: | Curl, L. Sampson, W. |
Citation: | Australian Orthodontic Journal, 2011; 27(2):102-109 |
Publisher: | Australian Society of Orthodontists |
Issue Date: | 2011 |
ISSN: | 0587-3908 |
Statement of Responsibility: | Linda Curl and Wayne Sampson |
Abstract: | Background: It is hypothesised that osteoprotegerin (OPG), as an osteoclast antagonist, may offer molecular control over the process of orthodontic root resorption. Previous work investigating OPG in a rat periodontal ligament (PDL) ankylosis model found no inhibitory effect on osteoclasts and odontoclasts when given at a recommended dosage of 2.5 mg/kg. It was considered that traumatically-induced PDL inflammation produces mediators and cytokines with the ability to stimulate clast cell differentiation and counter the effects of OPG. Aims: The present study investigated the presence of Tumour Necrosis Factor Alpha (TNF-α) and its receptor Tumour Necrosis Factor Receptor 1 (TNFR1) in a PDL sterile inflammatory model. Methods: Dry ice was applied for 15 minutes to the upper right first molar crown of eighteen, 8-week-old, male Sprague-Dawley rats of which 9 were injected with OPG at a dose of 2.5 mg/kg of body weight at the time of freezing. After 7 days, the rats were sacrificed and each maxilla processed for immunohistochemical identification of TNF-α and TNFR1. Results: Results showed the presence of root resorption in varying amounts and locations in both experimental and control rats. Reparative processes appeared greater in the OPG-treated rats, often with the presence of an ankylotic union. Immunolabelling showed the presence of TNF-α and TNFR1 in the sterile inflammation located mainly in the interradicular PDL area. More definitive labelling appeared in OPG-treated rats. Conclusion: The results indicated that TNF-α, and its receptor TNFR1, by their presence, may modify OPG effectiveness by offering an alternative pathway for osteoclast formation, which counters the anti-resorptive effects of OPG. |
Keywords: | Alveolar Process Fibroblasts Osteoclasts Giant Cells Gingiva Periodontal Ligament Molar Dental Pulp Animals Rats Rats, Sprague-Dawley Dental Pulp Necrosis Tooth Ankylosis Root Resorption Tumor Necrosis Factor-alpha Receptors, Tumor Necrosis Factor, Type I Random Allocation Wound Healing Male Osteoprotegerin Cold Temperature |
Rights: | © Australian Society of Orthodontists Inc. 2011 |
Appears in Collections: | Aurora harvest 5 Dentistry publications |
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