Reliability of reduced-thickness and thinly veneered lithium disilicate crowns

N. R F A Silva, E. A. Bonfante, L. M. Martins, G. B. Valverde, V. P. Thompson, J. L. Ferencz, Paulo Coelho

Research output: Contribution to journalArticle

Abstract

The present investigation hypothesized that the reliability of reduced-thickness monolithic lithium disilicate crowns is high relative to that of veneered zirconia (Y-TZP) and comparable with that of metal ceramic (MCR) systems. CAD/CAM first mandibular molar full-crown preparations were produced with uniform thicknesses of either 1.0-mm or 2.0-mm occlusal and axial reduction, then replicated in composite for standard crown dies. Monolithic 1.0-mm (MON) and 2.0-mm CAD/CAM lithium disilicate crowns, the latter with a buccal thin veneer (BTV) of 0.5 mm, were fabricated and then sliding-contact-fatigued (step-stress method) until failure or suspension (n = 18/group). Crack evolution was followed, and fractography of post mortem specimens was performed and compared with that of clinical specimens. Use level probability Weibull calculation (use load = 1,200 N) showed interval overlaps between MON and BTV. There was no significant difference between the Weibull characteristic failure loads of MON and BTV (1,535 N [90% CI 1,354-1,740] and 1,609 N [90% CI 1,512-1,712], respectively), which were significantly higher than that of Y-TZP (370 N [90% CI 322-427]) and comparable with that of MCR (1,304 N [90% CI 1,203-1,414]), validating the study hypothesis.

Original languageEnglish (US)
Pages (from-to)305-310
Number of pages6
JournalJournal of Dental Research
Volume91
Issue number3
DOIs
StatePublished - Mar 2012

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Crowns
Cheek
Computer-Aided Design
Ceramics
Metals
Suspensions
lithia disilicate

Keywords

  • biomaterial(s)
  • ceramics
  • glassceramic
  • prosthetic dentistry
  • prosthodontics
  • restorative materials

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

Silva, N. R. F. A., Bonfante, E. A., Martins, L. M., Valverde, G. B., Thompson, V. P., Ferencz, J. L., & Coelho, P. (2012). Reliability of reduced-thickness and thinly veneered lithium disilicate crowns. Journal of Dental Research, 91(3), 305-310. https://doi.org/10.1177/0022034511433504

Reliability of reduced-thickness and thinly veneered lithium disilicate crowns. / Silva, N. R F A; Bonfante, E. A.; Martins, L. M.; Valverde, G. B.; Thompson, V. P.; Ferencz, J. L.; Coelho, Paulo.

In: Journal of Dental Research, Vol. 91, No. 3, 03.2012, p. 305-310.

Research output: Contribution to journalArticle

Silva, NRFA, Bonfante, EA, Martins, LM, Valverde, GB, Thompson, VP, Ferencz, JL & Coelho, P 2012, 'Reliability of reduced-thickness and thinly veneered lithium disilicate crowns', Journal of Dental Research, vol. 91, no. 3, pp. 305-310. https://doi.org/10.1177/0022034511433504
Silva NRFA, Bonfante EA, Martins LM, Valverde GB, Thompson VP, Ferencz JL et al. Reliability of reduced-thickness and thinly veneered lithium disilicate crowns. Journal of Dental Research. 2012 Mar;91(3):305-310. https://doi.org/10.1177/0022034511433504
Silva, N. R F A ; Bonfante, E. A. ; Martins, L. M. ; Valverde, G. B. ; Thompson, V. P. ; Ferencz, J. L. ; Coelho, Paulo. / Reliability of reduced-thickness and thinly veneered lithium disilicate crowns. In: Journal of Dental Research. 2012 ; Vol. 91, No. 3. pp. 305-310.
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