Influence of Different Elastic Moduli of Dowel and Core on Stress Distribution in Root

概要

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This study was carried out to investigate the influences of elastic moduli of the dowel-core combination on the stress distribution in the root by the use of 2-dimensional finite element analysis. The peak stress at the dowel-cement interface was influenced strongly by a change of elastic modulus of the post(from 20, 000 kg / mm^2 as a hard prefabricated post to 8, 000 kg / mm^2 as a custom cast post)for both vertical and 45 degree oblique loading(ρ>90%). Peak dentinal stress adjacent to the luting cement layer depended only on the post material for vertical loading(ρ≒99%). In contrast, the post and core materials(from 8, 000 kg / mm^2 as cast core to 300kg / mm^2 as composite resin core)acted in cooperation on the stress magnitude for oblique loading, but the influence of the core material was stronger than that of the post(ρ of core≒41% and ρ of post≒26%). On the other hand, at the marginal region the effect of the core material contributed more than 86% to the peak stress value for both loadings, and the post material affected at most about 11% of the bending resistance.
日本歯科理工学会の論文