A 3-D Finite Analysis of Stress and Strain Around a Dental Implant with Different Abutment Angulations and Two Crest Module Design

Objectives: The purpose of this study was to record and evaluate the distribution and values of stress and strain generated within the cortical and cancellous bone around an implant with 00 and 150 abutment angulation and two different crest module designs (smooth collar and collar with micro threads) on applying a load of 178 N. Material and methods: A finite element model of a cross section of maxilla including the residual alveolar ridge and an implant along with an abutment was designed using computer software. The modelled implant-abutment was placed within the alveolar bone of maxilla. A Finite Element stress and strain analysis was done for implants with 00 and 150 angulations with two different crest module designs in maxilla. A similar load was applied to all the models. After this, the software processed the data with the help of recorded values. This data was then subjected to comparative assessment. Results: Stress distribution of the threaded and smooth collar implants with 0 degree angulation was appeared to be maximum displacement of 0.033mm in the cortical bone surrounding the implant neck on the labial side and strain was maximum in the cancellous bone around the neck of the implant. For the 150 angulation maximum displacement of 0.070mm was observed at the tip in both threaded and smooth collar implants and gradually decreased apically. Conclusion: Maximum of the stress concentration was observed in the cortical bone around the implant neck irrespective of the abutment angulation and implant design. The stress and strain values of the angulated abutment were 1.5-2 times more as compared to the straight abutment. Key words: FEA, abutment angulation, anterior maxilla, implant design, stress, strain