Effect of Tooth-Implant Retained Versus Tooth-Implant Supported Complete Overdenture on the Structures Supporting Lower Overdentures

Abstract

This studyaimed to evaluate and comparethe effect of tooth-implant retained and tooth-implant supported prosthesis on the supporting structures of complete overdenture rehabilitating lower ridge with single standing canine. Fourteen completely edentulous patients were selected from the outpatient clinic, Removable Prosthodontics Department, Faculty of Dentistry, Ain Shams University to participate in this study. Patients were precisely selected and thoroughly examined in an attempt to reduce human variables and eliminate any factor that might adversely affect the results of this study. All the selected patients were rehabilitated by maxillary mucosa supported complete denture.Standard clinical and laboratory techniques were followed for denture construction for all patients. As regard to the lower denture, patients were randomly divided into two equal groups: Group I:seven patients were rehabilitated with mandibular tooth-implant retained overdenture. Group II:seven patients were rehabilitated with mandibular tooth-implant supported overdenture. Surgical installation of the implant was performed under strict aseptic conditions and early loading protocol was followed.Patients were recalled one week after implant insertion for removal of sutures and picking up the metal housings on the fitting surface of the lower dentures(for group A)or denture insertion(for group B). Patients were recalled frequently for post-insertion inspection and adjustments. Follow-up visits were scheduled at time of denture insertion, six, and twelve months for inspection of the prosthesis and radiographic evaluation of the bone height changes of the supporting structures. Marginal bone height changes around the implants, canines and of the supporting ridge were monitored using the linear measurement system supplied by the cone beam computed tomography. Results obtained from this study showed that: • The concept of combined root and implant overdenture design was compatible with crestal bone heightover the one year observation period. Although the bone loss showed statistically significant difference with time, this amount of bone loss was within the permissible range that occurs within the first year and was within the normal range of success. • In group II, there was increase in overdenture movementlead tosignificantly higher amount of ridge bone loss compared to groupI patients. • Although the treatment modality used in group Iallows greater ridge bone preservation.It is significantly less compatible withperi-canine bone height than this used in group II.