Residual Thermal Stress Simulation in Three-Dimensional Molar Crown Systems

A Finite Element Analysis

Estevam A. Bonfante, Brian T. Rafferty, Nelson R F A Silva, Jay C. Hanan, Elizabeth Dianne Rekow, Van P. Thompson, Paulo Coelho

Research output: Contribution to journalArticle

Abstract

Purpose: To simulate coefficient of thermal expansion (CTE)-generated stress fields in monolithic metal and ceramic crowns, and CTE mismatch stresses between metal, alumina, or zirconia cores and veneer layered crowns when cooled from high temperature processing. Materials and Methods: A 3D computer-aided design model of a mandibular first molar crown was generated. Tooth preparation comprised reduction of proximal walls by 1.5 mm and of occlusal surfaces by 2.0 mm. Crown systems were monolithic (all-porcelain, alumina, metal, or zirconia) or subdivided into a core (metallic, zirconia, or alumina) and a porcelain veneer layer. The model was thermally loaded from 900°C to 25°C. A finite element mesh of three nodes per edge and a first/last node interval ratio of 1 was used, resulting in approximately 60,000 elements for both solids. Regions and values of maximum principal stress at the core and veneer layers were determined through 3D graphs and software output. Results: The metal-porcelain and zirconia-porcelain systems showed compressive fields within the veneer cusp bulk, whereas alumina-porcelain presented tensile fields. At the core/veneer interface, compressive fields were observed for the metal-porcelain system, slightly tensile for the zirconia-porcelain, and higher tensile stress magnitudes for the alumina-porcelain. Increasingly compressive stresses were observed for the metal, alumina, zirconia, and all-porcelain monolithic systems. Conclusions: Variations in residual thermal stress levels were observed between bilayered and single-material systems due to the interaction between crown configuration and material properties.

Original languageEnglish (US)
Pages (from-to)529-534
Number of pages6
JournalJournal of Prosthodontics
Volume21
Issue number7
DOIs
StatePublished - Oct 2012

Fingerprint

Dental Porcelain
Finite Element Analysis
Crowns
Aluminum Oxide
Hot Temperature
Metals
Tooth Preparation
Computer-Aided Design
Ceramics
zirconium oxide
Software
Temperature

Keywords

  • All-ceramics
  • Alumina
  • Coefficient of thermal expansion
  • Metal ceramic
  • Porcelain
  • Zirconia

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

Bonfante, E. A., Rafferty, B. T., Silva, N. R. F. A., Hanan, J. C., Rekow, E. D., Thompson, V. P., & Coelho, P. (2012). Residual Thermal Stress Simulation in Three-Dimensional Molar Crown Systems: A Finite Element Analysis. Journal of Prosthodontics, 21(7), 529-534. https://doi.org/10.1111/j.1532-849X.2012.00866.x

Residual Thermal Stress Simulation in Three-Dimensional Molar Crown Systems : A Finite Element Analysis. / Bonfante, Estevam A.; Rafferty, Brian T.; Silva, Nelson R F A; Hanan, Jay C.; Rekow, Elizabeth Dianne; Thompson, Van P.; Coelho, Paulo.

In: Journal of Prosthodontics, Vol. 21, No. 7, 10.2012, p. 529-534.

Research output: Contribution to journalArticle

Bonfante, Estevam A. ; Rafferty, Brian T. ; Silva, Nelson R F A ; Hanan, Jay C. ; Rekow, Elizabeth Dianne ; Thompson, Van P. ; Coelho, Paulo. / Residual Thermal Stress Simulation in Three-Dimensional Molar Crown Systems : A Finite Element Analysis. In: Journal of Prosthodontics. 2012 ; Vol. 21, No. 7. pp. 529-534.
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AU - Bonfante, Estevam A.

AU - Rafferty, Brian T.

AU - Silva, Nelson R F A

AU - Hanan, Jay C.

AU - Rekow, Elizabeth Dianne

AU - Thompson, Van P.

AU - Coelho, Paulo

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AB - Purpose: To simulate coefficient of thermal expansion (CTE)-generated stress fields in monolithic metal and ceramic crowns, and CTE mismatch stresses between metal, alumina, or zirconia cores and veneer layered crowns when cooled from high temperature processing. Materials and Methods: A 3D computer-aided design model of a mandibular first molar crown was generated. Tooth preparation comprised reduction of proximal walls by 1.5 mm and of occlusal surfaces by 2.0 mm. Crown systems were monolithic (all-porcelain, alumina, metal, or zirconia) or subdivided into a core (metallic, zirconia, or alumina) and a porcelain veneer layer. The model was thermally loaded from 900°C to 25°C. A finite element mesh of three nodes per edge and a first/last node interval ratio of 1 was used, resulting in approximately 60,000 elements for both solids. Regions and values of maximum principal stress at the core and veneer layers were determined through 3D graphs and software output. Results: The metal-porcelain and zirconia-porcelain systems showed compressive fields within the veneer cusp bulk, whereas alumina-porcelain presented tensile fields. At the core/veneer interface, compressive fields were observed for the metal-porcelain system, slightly tensile for the zirconia-porcelain, and higher tensile stress magnitudes for the alumina-porcelain. Increasingly compressive stresses were observed for the metal, alumina, zirconia, and all-porcelain monolithic systems. Conclusions: Variations in residual thermal stress levels were observed between bilayered and single-material systems due to the interaction between crown configuration and material properties.

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