[Clinical study of immediate implant-support and mandibular overdentures retained by conical crowns].

PURPOSE: To evaluate the clinical effectiveness and feasibility of immediate implant-supported mandibular overdentures retained by conical crowns. METHODS: In this study, 10 patients with edentulous mandible were included. They were restored by traditional complete denture before operation. All patients received 4 dental implants in the inteforaminal region and had the implants loaded with all overdenture prostheses retained by conical crowns at that day. All patients were followed up for 2, 4, 8, 12, 24, 48 weeks. The stability of implants, the state of peri-implant soft-tissue, marginal bone resorption, the state of osseointegration of implants, and patient satisfaction were evaluated. RESULTS: A total of 40 implants were loaded immediately. All implants had osseointegration. No infections of peri-implant soft-tissue occurred, no implants exhibited peri-implant radio lucencies, marginal bone had no resorption. The patients were satisfied with the outcomes. CONCLUSION: The results of this clinical trial suggest that immediate loading of the implants by conical crowns to support overdenture prostheses for edentulous mandible is predictable, if primary implant stable is.