Influence of bone loss pattern on stress distribution in bone and implant: 3D-FEA study / 대한치과보철학회지

ABSTRACT

PURPOSE: This 3D-FEA study was performed to investigate the influence of marginal bone loss pattern around the implant to the stress distribution. MATERIAL AND METHODS: From the right second premolar to the right second molar of the mandible was modeled according to the CT data of a dentate patient. Teeth were removed and an implant (small ef, Cyrillic 4.0 x 10.0 mm) was placed in the first molar area. Twelve bone models were created Studied bone loss conditions were horizontal bone loss and vertical bone loss, assumed bone loss patterns during biologic width formation, and pathologic vertical bone loss with or without cortification. Axial, buccolingual, and oblique force was applied independently to the center of the implant crown. The Maximum von Mises stress value and stress contour was observed and von Mises stresses at the measuring points were recorded. RESULTS: The stress distribution patterns were similar in the non-resorption and horizontal resorption models, but differed from those in the vertical resorption models. Models assuming biologic width formation showed altered stress distribution, and weak bone to implant at the implant neck area seams accelerates stress generation. In case of vertical bone resorption, contact of cortical bone to the implant may positively affect the stress distribution.