A 3-dimensional finite element analysis of tapered internal connection implant system (Avana SS III(R)) on different abutment connections / 대한치과보철학회지

ABSTRACT

PURPOSE: The purpose of this study was to compare the stress distribution characteristics of four different abutment connections on SS-III(R) fixture under occlusal loading, using 3-dimensional finite element method. MATERIALS AND METHODS: The fixture of SS-III(R) (Osstem, Korea) with 4 mm diameter and 11.5 mm length and 4 types of abutments were analyzed; Solid, Com-Octa, ComOcta Gold, and Octa abutment. The models were placed in the area of first molar in the mandible. The 4 loading conditions were; (1) the vertical loading of 100 N on the central fossa, (2) the vertical loading of 100 N on the buccal cusp, (3) the 30degreesinclined loading of 100 N to lingual side on the central fossa, and (4) the 30degrees inclined loading of 100 N to the lingual side on the buccal cusp. The 3G.Author program was used, the von-Mises stress was calculated and the stress contours were plotted on each part of the implant systems and the surrounding bone structures. RESULTS: Regardless of abutment types and loading conditions, higher stress concentration was observed at the cortical bone. In cancellous bone, the highest stress was observed at apical portion and the maximum stress occurred at the implant neck. The higher internal stress was observed in the fixtures than in the bone. The lowest stress was observed at loading condition 1 and the stress concentration was also lower than any other loading conditions. CONCLUSION: Within the limitation of the result of this study, it seems that the abutment connection type does not affect much on the stress distribution of bone structure.