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• W3048804493 abstract "Abstract Aim To analyse the effect of post‐core, and cement materials and thickness of the cement lute on the stress in post‐core systems under ultrasonic vibration at different frequencies and amplitudes using three‐dimensional finite element analysis. Methodology Eight three‐dimensional finite element models of a maxillary central incisor with post‐cores were established. Two post‐core materials (Au and Ni‐Cr alloys), two cements (glass ionomer (GI) and zinc phosphate (ZP)) and two cement layer thicknesses (50 and 150 μm) were considered. Vibration loads were applied near the neck on the buccal side of the core at frequencies of 10–40 kHz and amplitudes of 10–50 μm. The maximum shear stress of the cement layer and maximum principal stress of the roots and their distributions were investigated. Results The stresses on cements and roots increased with an increase in the frequency and amplitude of the vibration load and elastic modulus of the cements, and decreased with increasing thickness of the cement layer and elastic modulus of the post‐core. Maximum cement stress was observed on the contralateral upper part of the loading side, whereas the maximum root stress was found on the ferrule where the load was applied. Conclusions In this simulated model, the frequency and amplitude of ultrasound needed to remove a post‐core were positively related to the elastic modulus of the post‐core and thickness of the cement layer and negatively related to the elastic modulus of the cements." @default.
• W3048804493 created "2020-08-18" @default.
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• W3048804493 date "2020-09-13" @default.
• W3048804493 modified "2023-09-26" @default.
• W3048804493 title "Influence of post‐core material and cement peculiarities on stress of post‐cores under ultrasonic vibration: a three‐dimensional finite element analysis" @default.
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• W3048804493 doi "https://doi.org/10.1111/iej.13388" @default.
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