RESUMO
The aim of this paper is to introduce an alternative technique for the treatment of oroantral communication (OAC). Closure of OAC, reconstruction of the posterior maxilla by sinus-lifting procedure with a particulate xenograft, and implant insertion were performed in the same operation. A lateral antral approach was used in the sinus elevations. The sinus membranes were elevated gently around the perforation area, and then a barrier membrane was used to close the perforation. Care was taken not to extend the perforation. Next, the maxillary sinus was filled with a particulate xenograft, and an implant was inserted simultaneously. Forty-seven and 40 months of clinical and radiographic follows-up revealed healthy and functional implants in the teeth area.
RESUMO
BACKGROUND AND OBJECTIVE: Thymoquinone has a variety of pharmacologic properties, including antihistaminic, antibacterial, antihypertensive, hypoglycemic, anti-inflammatory and anti-oxidative activities. Through its anti-inflammatory and antioxidant properties, thymoquinone may play an important role in preventing periodontal diseases. The aim of this study was to evaluate the effectiveness of thymoquinone in preventing the initiation and progression of periodontitis in a rat periodontitis model. MATERIAL AND METHODS: Twenty-four rats were randomly divided into three experimental groups: a nonligated (NL) treatment group (n = 8), a ligature-only (LO) treatment group (n = 8) and a ligature plus thymoquinone (10 mg/kg, daily for 11 d) (TQ) treatment group. In order to induce experimental periodontitis, a 4/0 silk suture was placed at the gingival margin of the right-mandibular first molars of the rats. Thymoquinone was administered by gastric feeding until the animals were killed on day 11. Changes in the alveolar bone levels of rats in each group were measured clinically, and tissues of rats in each group were examined histopathologically to determine inflammatory cell infiltration (ICI), osteoblast and osteoclast activities, and osteoclast morphology. RESULTS: Alveolar bone loss around the mandibular molar tooth was significantly higher in the LO group compared with NL and TQ groups (p < 0.05). The ratio of the presence of ICI and osteoclast numbers was significantly higher in the LO group than in the NL and TQ groups (p < 0.05). Osteoblastic activity was significantly lower in the LO group than in the NL and TQ groups (p < 0.05). CONCLUSION: The present study showed that the oral administration of thymoquinone diminishes alveolar bone resorption in a rat periodontitis model.