The purpose of this study was to evaluate the effects of various fabrication techniques and materials used in implant-supported mandibular overdentures with a Hader bar attachment over added stress distribution. Three-dimensional geometric solid models, consisting of two implants (3.3 mm × 12 mm) placed at the bone level on both mandibular canine regions and a Hader bar structure, were prepared. Model 1 simulated a bar retentive system made from Titanium Grade 5 material by Computer Numerical Control (CNC) milling technique without using any converting adapter/multi-unit element on the implants, while Model 2 simulated the same configuration, but with converting adapters on the implants. Model 3 simulated a bar retentive system made from Cobalt-Chromium material, made by using conventional casting technique with converting adapters on the implants. Static loads of 100 Newton were applied on test models from horizontal, vertical and oblique directions. ANSYS R15.0 Workbench Software was used to compare Von Mises stress distribution and minimum/maximum principal stress values, and the results were evaluated by using Finite Element Analysis method. As a result, the highest stress distribution values under static loading in three different directions were obtained in Model 1. Stress was observed intensely around the necks of the implants and the surrounding cortical bone areas in all models. In scope of the results obtained, using converting adapters on implants has been considered to decrease transmission of forces onto implants and surrounding bone structures, thus providing a better stress distribution. It has also been observed that the type of material used for bar fabrication has no significant influence on stress values in those models where converting adapters were used.

Introduction: There is a growing demand for implant dentistry as the first choice of rehabilitation for treating patients with missing teeth. Clinicians can encounter asymptomatic retained root fragments in edentulous spaces. This case report presents the long‐term prognosis of an implant resulting in late failure, with an attached root remnant to the fixture 11 years after implant placement. Case Report: A 68‐year‐old female patient presented to the clinic with complaints of function related to a maxillary right four‐unit implant‐supported bridge 11 years after the first insertion of the implants. After the removal of the restoration, a root remnant was found as adhered to the fixture of the middle supporting implant. The implant was placed encroaching upon the mesial part of the residual root fragment left unintentionally, which was discovered accidentally during the bridge removal. Conclusion: Clinicians should show ultimate attention when utilizing the retained root remnants in implant sites, considering the potential risk of hindering osseointegration. However, osseointegration of the encroached implant and root fragment is plausible, with no detrimental short‐term impacts observed. A risk–benefit evaluation should be assessed individually, as late failures can still occur. Trial Registration: ClinicalTrials.gov identifier: NCT06671678