The Purpose of this study is to is to compare the effect of occlusal adjustment using T scan III and articulating paper on the vertical bone height changes around dental implants supporting lower single fixed detachable hybrid prosthesis Material and method: Fourteen male patients having completely edentulous mandibular arch and full dentate in the maxillary arch were selected from the outpatient clinic prosthodontics department faculty of dentistry Ain Shams University to participate in this study . All Patients were rehabilitated with six implants retaining mandibular fixed detachable prosthesis designed by CAD/ CAM. According to the method of detection of occlusal errors and adjustment the patients were divided into two groups, Group I in which T scan III device was used to detect occlusal errors and group II where articulating paper was used in the patient mouth and occlusal adjustment were made according to the tool used. Radiographic evaluation using CBCT was done to evaluate the amount of vertical bone loss around the supporting implant throughout the follow -up period.Results : There was increase in vertical bone loss in group I and II through-out the follow up period and on comparing the two groups there was a significant difference in the vertical bone height changes around the supporting implants after one year from the follow up period where group II showed more vertical bone loss. Conclusion :Within the limitation of this study, it could be concluded that the use of t scan III device allow for better occlusal adjustment in case of implant supported lower single denture than articulating paper and resulting in less vertical bone loss around the supporting dental implants.

Introduction: Using a soft liner-retained implant-supported overdenture offers the restorative dentist a treatment option when the number, location, or angulation of dental implants placed may differ from the original treatment plan. The aim of the present study was to evaluate the marginal bone height changes in mini-implant supported overdentures using different retaining denture softliners. Patients & Methods: Twenty-one completely edentulous cases were selected for this study. The patients were allocated into one of the three treatments groups. In group I the lower overdenture was relined with "acrylic based soft liner"; group II the lower overdenture was relined with "silicon based soft liner'', while in group III: the lower overdenture was relined with ''Retention Sil 200''. Patients in all groups received CBCT immediately after the implant loading, 6 months and 12months after insertion of partial overdenture. Each implant was evaluated for the marginal bone level. Results: The Silicon, Retention Sil 200 and acrylic based soft liners showed a statistical significant difference in the amount of bone resorption. Conclusion: the current study concluded that Silicon and acrylic based soft liners show significant difference in their effect on the supporting bone due to stresses transmitted to miniimplant retained mandibular over dentures. Retention. Sil resilient liners cannot be considered as a permanent mean of retention for mini implant retained mandibular but it shows high success for short-and medium-term management.

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Objective: To evaluate the impact of atraumatic extraction with immediate implantation in preserving the vertical height of bone supporting two implants retaining overdenture.Materials & Methods: Ten people were chosen at random from the Ain Shams University prosthodontics outpatient clinic. For this case, the patient must meet the following criteria: they must be between the ages of 40 and 60, have a totally edentulous maxillary arch, and have extractions advised for both canines in the mandibular arch. All patients in this research were transformed immediately with two implants in fresh sockets at the interforaminal region in the mandible by using two extraction techniques. Group I: immediately placed implants on the right side for canines extracted by a conventional method, and Group II: immediately placed implants on the left side for canines extracted by the atraumatic way (piezo tomes). Digital Radiographic assess the quantity of marginal bone loss throughout 12 months follow-up.Results: There was a significant difference in mesial, distal, and overall. (baseline/12 months) was the highest. At the same time, there was a significant difference between other intervals by using Paired t test. After a year, group II had a noticeable reduction in vertical bone loss when compared to the other one. Conclusion:It can be concluded that atraumatic extraction is a key prerequisite for immediate implant placement with immediate loading, & piezo tomes were the more efficient than conventional extraction.