Purpose: Purpose of this study to evaluate the effect of implant position on prosthesis movement of mandibular two implant-supported overdenture under simulating biting force. Materials and methodology: 30 experimental overdentures (N=30) were made for an edentulous mandibular test model, which included artificial mucosa. Based on implant position, 30 samples overdentures were divided into three groups (n=10) (i.e., A and E, B and D,in between B and D). For this study, the ball and O-ring attachment system was used. 100 N vertical loads were used on the left first molar region, 55N on the left canine, and 40N on the mid-anterior area. The loading points vertical displacement as well as the right distal edges horizontal and vertical displacements were measured.A 1-way analysis of variance test was used to statistically analyse the displacement values with the implant position as a factor, (p=.05) was used to statistically analyze the values of the vertical and horizontal displacement at the distal edge of the overdenture. Results:The mean horizontal displacement at right distal edge on incisor, canine and molar loading was highest in Group III with p value < 0.05. when compared in between groups with paired t tests there was no statistically significant difference on incisor loading between group II and Group III with p value >0.05. Mean vertical displacement at right distal edge on incisor loading was highest in group II and on canine and molar loading, it was highest in Group III. Conclusion:Change in implant position influences the displacement of implant supported overdenture.

Purpose: The bond strength of metal ceramic restorations places a key role for the longevity of the prosthesis which could be affected by the fabrication technique and the number of firings. The current research evaluates the effect of repeated firings on bond strength of metal ceramic systems with copings fabricated from two processing techniques, lost wax technique through induction casting and direct metal laser sintering. Materials and Methods: 21 metal ceramic bars will be fabricated using Direct Metal Laser Sintering (Group DMLS) and 21 using conventional lost wax technique (Group Cast). Each sample will have a dimension of 25x3x0.5mm respectively. In the center of each bar, a 1.1mm thickness of porcelain will be fused onto an 8x3mm rectangular area. Each group is further subdivided into 3 subgroups which are subjected to repeated firings (3, 5, 7) and the bond strength is measured with positioning of the samples on a Universal Testing Machine. Results: Group ANOVA and Post Hoc Tukeys test showed comparison of overall bond strength of ceramic samples fabricated using DMLS & Casting subjected to different Firing was done and the difference in mean was statistically significant (p<0.05). Conclusion: The DMLS group showed slight superior bond strength properties when compared with Cast group.