Effect of finish line design on stress distribution in bilayer and monolithic zirconia crowns: a three-dimensional finite element analysis study

Shoko Miura, Shin Kasahara, Shinobu Yamauchi, Hiroshi Egusa

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

This study evaluated the influence of different finish line designs and abutment materials on the stress distribution of bilayer and monolithic zirconia crowns using three-dimensional finite element analysis (FEA). Three-dimensional models of two types of zirconia premolars – a yttria-stabilized zirconia framework with veneering ceramic and a monolithic zirconia ceramic – were used in the analysis. Cylindrical models with the finish line design of the crown abutments were prepared with three types of margin curvature radius (CR): CR = 0 (CR0; shoulder margin), CR = 0.5 (CR0.5; rounded shoulder margin), and CR = 1.0 (CR1.0; deep chamfer margin). Two abutment materials (dentin and brass) were analyzed. In the FEA model, 1 N was loaded perpendicular to the occlusal surface at the center of the crown, and linear static analysis was performed. For all crowns, stress was localized to the occlusal loading area as well as to the axial walls of the proximal region. The lowest maximum principal stress values were observed when the dentin abutment with CR0.5 was used under a monolithic zirconia crown. These results suggest that the rounded shoulder margin and deep chamfer margin, in combination with a monolithic zirconia crown, potentially have optimal geometry to minimize occlusal stress.

Original languageEnglish
Pages (from-to)159-165
Number of pages7
JournalEuropean Journal of Oral Sciences
Volume126
Issue number2
DOIs
Publication statusPublished - 2018 Apr

Keywords

  • Y-TZP
  • all-ceramic crown
  • digital dentistry
  • fracture
  • veneering ceramic

ASJC Scopus subject areas

  • Dentistry(all)

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