Evaluation of Stress Distribution Among Two Different Pre-angled Abutments of Implants in Two Different Densities of Bone at Different Levels Along the Implant-/n Vitro Study.

AIM: The present study evaluated the stress distribution among two different pre-angled abutments of implants in two different densities of bone at different levels along the implant. MATERIALS AND METHODS: The stress allocation was assessed and compared between the control group, i.e., 0 degrees and two different pre-angled abutments, i.e., 10 degrees and 20 degrees in two different bone densities as D2 and D3, using the finite element analysis. The geometric configuration of the mandible was generated using Ansys version 14.5graphic pre-processing software. Young's modulus (E) of elasticity and Poisson's ratio (mu) of the material were integrated into the representation. Average vertical load of 150 N was applied on the central fossa and buccal cusp of the mandibular first molar. Highest values of von Mises stresses were observed in different bone densities and angulated abutments at different levels. RESULTS: With increase in the abutment angulation between D2 and D3 densities along implant abutment junction the percentage of stress concentration was maximum with the values being 0.05 %, 108.67% and 128% in 0 degrees ,10 degrees , and 20 degrees angulations respectively, whereas, along the implant, the percentage of stress was increased with 0.6 %, 98.55% and 115.6% in 0 degrees ,10 degrees , and 20 degrees angulation. CONCLUSION: Stress concentration was observed maximum at the implant abutment junction irrespective of the angulations and the densities used and the value of stress concentration accumulated within the cortical bone increases with increase in bone density and angulation of the implant. CLINICAL SIGNIFICANCE: These finding would aid in recognizing the importance of quality of cortical bone which and helps in avoiding the overloading of the implant abutment interface for the long-term prognosis of the implant.