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Does overlay preparation design affect polymerization shrinkage stress distribution? A 3D FEA study

Author

Listed:
  • Guilherme Schmitt de Andrade
  • Alana Barbosa Alves Pinto
  • João Paulo Mendes Tribst
  • Eliseo Pablo Chun
  • Alexandre Luiz Souto Borges
  • Guilherme de Siqueira Ferreira Anzaloni Saavedra

Abstract

This study evaluated the polymerization shrinkage stress of three tooth preparation designs for indirect ceramic overlay by finite element analysis: isthmus preparation (IST); without isthmus preparation (wIST); and non-retentive preparation (nRET). The models were created based in prepared dental typodonts and were digitally impressed with an intraoral scanner. The interfaces in all models were considered perfectly bonded and all materials were considered homogeneous, linear, and isotropic. The polymerization shrinkage of the cement layer (100 µm) was simulated and evaluated by maximum principal stress criteria. The stress peaks followed this sequence: restoration = IST (13.4 MPa) > wIST (9.3 MPa) > nRET (9 MPa); cement layer = IST (16.9 MPa) > wIST (12.6 MPa) > nRET (10-7.5 MPa); and teeth = IST (10.7 MPa) > wIST (10.5 MPa) > (9 MPa). For the cement layer, the non-retentive preparation (nRET) had the lowest shrinkage stress from all the groups, obtaining a more homogeneous stress distribution on the cement surface. Regarding the abutment teeth, the IST generated a higher shrinkage stress area on the dental structure, concentrating higher stress magnitude at the axiopulpar and axiogingival angles. Non-retentive preparation seems to reduce polymerization shrinkage stress.

Suggested Citation

  • Guilherme Schmitt de Andrade & Alana Barbosa Alves Pinto & João Paulo Mendes Tribst & Eliseo Pablo Chun & Alexandre Luiz Souto Borges & Guilherme de Siqueira Ferreira Anzaloni Saavedra, 2021. "Does overlay preparation design affect polymerization shrinkage stress distribution? A 3D FEA study," Computer Methods in Biomechanics and Biomedical Engineering, Taylor & Francis Journals, vol. 24(9), pages 1026-1034, August.
    • Handle: RePEc:taf:gcmbxx:v:24:y:2021:i:9:p:1026-1034
    DOI: 10.1080/10255842.2020.1866561
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