Purpose:The purpose of this clinical study was to use the digital occlusal analysis to compare the maximum occlusal force and occlusal force distribution in mini-implants and standarddiameter implant mandibular overdentures. Also, to compare patient satisfaction and prosthodontic maintenance after two years of function. Materials and methods: Twenty-two edentulous patients were randomly divided equally into two groups. MIO group (test group) received mandibular overdentures retained by four mini-implants, and SDO group (control group) received mandibular overdentures retained by two standard diameter implants. Digital occlusal study was done to evaluate occlusal force distribution, maximum occlusal contact force, and tooth contact number. Patient satisfaction was assessed using a visual analogue scale questionnaire. Prosthodontic maintenance measures were analyzed. The follow-up period was two years after overdenture insertion. Results: Insignificant differences were found in occlusal force parameters between both groups. All domains of patients' satisfaction increased significantly in MIO and SDO groups. There were insignificant differences in patient satisfaction between both groups. Prosthodontic maintenance requirements for both groups were comparable during the two-year follow-up. The most frequent prosthodontic complication was the wear of female housing. This was followed by dislodgement and replacement of female parts. Conclusion: Within the study's limitations, mini-implants can improve mandibular overdenture performance regarding maximal occlusal force and tooth contact number without impairing force distribution by employing digital occlusal analysis. Mandibular overdentures retained by mini-implants can achieve similar outcomes as standard-diameter implant overdentures in terms of patient satisfaction and prosthodontic problems.
Statement of problem:Studies have shown the efficacy of mandibular overdentures retained by a single implant for oral rehabilitation of edentulous patients. The primary complication of these overdentures has been reported to be their high incidence of midline fracture. The addition of a reinforcing framework to the acrylic denture base can prevent fractures and ensure the durability of overdenture treatment. Purpose: The aim was to compare crestal bone loss and prosthetic maintenance events of single implant-retained mandibular overdentures (SIMO) reinforced by Polyetherether ketone (PEEK) and metallic frameworks after a two-year follow-up period.Materials and methods: Twenty-two edentulous patients received SIMOs containing reinforcing frameworks. The resin patterns of the frameworks were printed using CAD/CAM. The printed castable resin frameworks were processed using either PEEK by injection molding technique (PEEK group) or cobalt-chromium metal by conventional casting techniques (Metal group). Crestal bone loss was evaluated using digital radiography and prosthetic maintenance events were analyzed. The follow-up period was two years after overdenture loading.Results: There was a slight increase in crestal bone loss in the Metal group compared to the PEEK group, but the difference was statistically insignificant. There was no overdenture fracture, crack, or abutment fracture in either group. No significant differences in prosthodontic maintenance events between the two groups were noted. Conclusions:Based on the limitations of this study, it is concluded that the crestal bone loss and prosthetic maintenance results of SIMO reinforced with a PEEK framework were comparable to those of metal reinforcement.
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