Objective: The success of dental implants depends on accurate planning of the occlusal scheme enrolled in the overlying prosthesis, so the present study was conducted to evaluate the effect of two different occlusal schemes on the rate of supporting bone resorption in All on 4 mandibular implant retained overdentures constructed with two occlusal schemes, lingualized and group function. Clinical occlusal analysis was also done using digital T-scan to analyze the occlusion and disocclusion timings.
Materials and Methods: Fourteen edentulous male patients were selected according to certain criteria, patients had guided surgical installation of four implants following “All on 4 “concept and were randomly allocated into two equal groups, Group I:rehabilitated with provisional fixed detachable prosthesis following the group function occlusal concept and Group II: rehabilitated with provisional fixed detachable prosthesis following the lingualized occlusal concept. The implants in the two groups were monitored using cone beam computed tomography at loading, 6 months and one year later. Digital occlusal analysis was performed using the T-scan at loading.
Results: The results of the current study showed statistically significant less bone height changes values in group I in comparison to group II as per the radiographic outcomes while the occlusal analysis showed statistically significant increase in disocclusion time (in seconds)in group I.
Conclusion: Lingualized occlusal scheme showed less stresses transmitted to dental implants and their supporting structures as reflected in decreased periimplant bone loss.