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.

Amaç: Periodontal tedavi, kırık, restoratif uygulamalar, çürük gibi nedenlerle koruyucu tabakanın kalkması sonucu dentin tübülleri açığa çıkıp dişte hassasiyet oluşunca hassasiyet giderici ajanlardan yararlanılır. Çalışmamızın amacı; postoperatif diş hassasiyetini gidermek için kullanılan hassasiyet giderici ajanların, adeziv simantasyondaki bağlantıya etkisini incelemektir. Gereç ve SUMMARY Aim:The aim of the study is to research the effect that link is in adhesive cementation of dentin desensitizing agent, which use to desensitizate prosperative dental. Materials and Methods:In this study, sixteen intact human third molar teeth were used. The teeth were randomly divided into two different groups (n: 8). Two different dentin desensitizer agents, Gluma and Teethmate Desensitizer, are used in the study. All samples were embedded into PMMA-based acrylic resin. The occlusal enamel tissues of teeth were removed to expose occlusal dentin. In the first group, firstly Gluma Desensitizer was applied to dentin surfaces according to manufacturer' instruction. Gluma self-etch was applied to dentin surfaces