Effects of nicotine on the healing of extraction sockets in rats: a histological study

The aim of the present study was to evaluate, histologically, the influence of nicotine on the socket healing after tooth extra ction in rats. Eighty animals were divided into 4 groups of 20 rats each (2 control and 2 test groups). In the first and second test groups, t he animals received one dose of nicotine hemisulfate solution once or twice daily, respectively. In the control groups, the animals receiv ed sterile saline once or twice daily. All solutions were injected subcutaneously on the dorsum of the animals for 4 weeks. The results sh owed that nicotine delayed alveolar healing, especially in terms of organization of connective tissue and osteoneogenesis. Angiogene sis was considerably impaired in the ossification area and in the gingival tissues as well. We concluded that the impairment of the hea ling of extraction sockets was found to be directly related to the drug dosage.