Active clinical trials for "Bone Resorption"

two groups of inserted implants: trans-gingival and under-bone level; difference in the marginal bone loss at six months from placement between the two groups of implant positioned in the posterior atrophic maxilla

Recent data found that peri-implantitis may differ from periodontitis at the histological level in terms of extent and composition of the cellular components. From human biopsies, it has been shown a deeper apical extension of the inflammatory cell infiltrate and a larger proportion of granulocytes and macrophages in peri-implantitis lesions compared to periodontitis lesions. Following experimental peri-implantitis, it has been observed a continuing bone loss around dental implants after ligature removal; whereas, such a progression was not observed around teeth after cessation of the experimental periodontitis. The factors influencing the recruitment and the activation of osteoclasts in both diseases have not been compared yet. Hypothesis : The more rapid and more severe alveolar bone destruction occurring in peri-implantitis compared to periodontitis is due at least in part to differences in the inflammatory process in these diseases. Aim: to study the cytokine profile produced by gingival explants from periodontitis or peri-implantitis sites and to test the consequences on alteration of bone remodelling activity using in vitro approach. Materials and methods The investigators will establish a collection of human gingival samples from patients undergoing surgical treatment of periodontitis or peri-implantitis. The investigators will test pro-inflammatory cytokines and chemokines release and consequences on osteoclast differentiation and activity.

Biomarkers of bone resorption will be measured in the blood of patients with bone metastases from prostate cancer during the course of their illness. Changes in these biomarkers will be correlated with the patient's treatment with antiandrogen therapy and bisphosphonates and the response and/or progression of their cancer. It is hoped that serial measurement of these biomarkers may allow therapeutic monitoring in the future with successful individualisation of bisphosphonate therapy for metastatic prostate cancer.

This study is aiming to evaluate clinically, radiographically ,and histologically GBR using collagen membrane in combination with a mixture of ABBM and autogenous particulated bone compared to collagen membrane with ABBM in atrophied anterior maxilla.

To achieve esthetic immediate implants a minimum of adequate buccal bone thickness must be present. It was postulated that 2 mm of buccal bone thickness was needed to prevent recession of the buccal plate. However, this was reduced to 1 mm with more ongoing research. In a recent study postulated that a buccal bone thickness less than 1 mm could be sufficient. Scarce literature was found that monitored the ridge alterations following implant placement. In regards to the controversies regarding the minimal initial buccal bone thickness required to perform immediate implant placement, our study aims to monitor the buccal bone thickness and soft tissue changes over a year from implant and prosthetic placement.

In patients that are going to be subjected to a tooth extraction in the anterior maxillary (from canine to canine) does the position of the intact alveolar socket related to maxillary basal bone interferes with the rate of resorption and remodeling process of the alveolar ridge ?