ABSTRACT
One of the new methods for stress distribution evaluation is finite element. In this method, mechanical properties of objects including implants may be evaluated and advantage and disadvantages of each configuration may be revealed. The purpose of this study was comparison of vonmisses stress distribution of three implants, Persia, ITI and Biohorizons in surrounding bone of anterior and posterior part of mandible by finite element modeling. In this study first experimental model of mandible was constructed by means of CMM, according to data's from human skull CT scans. Then the implants were modeled using Project Profile. Mesh was constructed on the model in ANSYS and implants were located were located at first incisor and second molar area. The elastic modulus and cortical layer thickness applied in incisor [D2] and molar [D3] region was different. Three force vectors and two moments were applied, [Vertical = 100N vestibule lingual: 20n [t2] mesiodistal = 20 N [T1] M1 = M2 = 100 N/mm], first individually and then all together. The results were calculated by ANSYS software using contour and graphs. In incisor [D2] coronal region the best vonmisses stress distribution was seen in Biohorizon. In body, the distribution was same in ITI and Biohorizon which was better than Persia. In apical area, the least stress was distributed respectively in Biohorizon, Persia and ITI. In molar [D3] area coronal region, the amount of stress was least in ITI and was distributed differently in the way of penetration to trabecular layer. In body, the distribution was respectively better in Biohorizon, Persia and ITI. In apical region, best stress distribution was seen in Biohorizon however it was not property concentrated in ITI type. Condition of surrounding bone and implant design causes variation in vonmisses stress distribution around implants. In area's which quality of surrounding bone is weak range of variation is higher and stress concentration may cause bone resorption. The best distribution in weak bone condition was revealed around Biohorizon. Persia [made in Iran] have proper stress distribution and may compete with other brands