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Influence of margin design and taper abutment angle on a restored crown of a first premolar using finite element
Kaarel A Proos1, Michael V Swain, Jim Ironside
1School of Aerospace, Mechanical and Mechatronic Engineering, Faculty of Dentistry, Biomaterials Science Research Unit, National Innovation Centre, Eveleigh, New South Wales, Australia.
Purpose:
The purpose of this study was to determine the influence of margin design and taper abutment angle on the stresses developed in all-ceramic first premolar crowns.
Materials And Methods:
Four margin designs and three taper abutment angles were independently incorporated into models examined by finite element analysis. A 600-N force was applied vertically downward.
Results:
The taper abutment angle had a significant influence on the greatest peak tensile maximum principal stresses (sigma11) in the coping (16.8% change in stress for an 8-degree variation in taper angle). The margin design had significant influence on the highest peak tensile sigma11 in the dentin (60% difference in stress between designs) and lesser significance in the cement (30%). All calculated values of the highest peak tensile sigma11 were considerably lower than the fracture strengths of the respective materials in which the stresses resided.
Conclusion:
A smaller taper abutment angle and a larger chamfer radius (equivalent to the modified light chamfer) are recommended to reduce the magnitude of the greatest peak tensile sigma11 based on the finite element modeling conducted.