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Fracture resistance of glazed, full-contour ZLS incisor crowns.
J Prosthodont Res. 2017 Jul; 61(3):344-349.JP

Abstract

PURPOSE

To compare the failure behaviour of zirconia-reinforced lithium silicate (Celtra Duo, DeguDent) with that of lithium disilicate (IPS e.max CAD, Ivoclar Vivadent) and feldspar (Mark II, VITA) ceramics.

METHODS

Three groups of sixteen glazed maxillary incisor crowns were produced. The inner surfaces of the crowns were etched, then luted to metal dies with self-adhesive cement. Single load-to-failure tests were performed before and after thermo-mechanical ageing. To simulate clinical conditions, the specimens were thermocycled (10,000 cycles between 6.5°C and 60°C) and underwent chewing simulation (1,200,000 cycles, Fmax=86N). Statistical analyses were performed by use of non-parametric Kruskal-Wallis and Mann-Whitney U-tests.

RESULTS

Before ageing, all the monolithic incisor crowns fractured at test forces >285N. Mean fracture loads were highest for zirconia-reinforced lithium silicate (725N, SD 162N), slightly lower for lithium disilicate (701N, SD 276N), and lowest for feldspar (554N, SD 190N). The differences between the results were not statistically significant. After ageing, fracture resistance decreased for all materials except zirconia-reinforced lithium silicate. Mean fracture loads were highest for zirconia-reinforced lithium silicate (766N, SD 98N) and significantly lower for both lithium disilicate (485N, SD 64N) and feldspar (372N, SD 116N).

CONCLUSION

Monolithic restorations fabricated from zirconia-reinforced lithium silicate retain high fracture resistance after extensive thermo-mechanical ageing. This preclinical study suggests that cohesive failures of monolithic anterior crowns produced of these ceramics will not be a major problem in dental practice.

Authors+Show Affiliations

Department of Prosthodontics, University Hospital Heidelberg, Germany. Electronic address: Sebastian.schwindling@med.uni-heidelberg.de.Department of Prosthodontics, University Hospital Heidelberg, Germany.Department of Prosthodontics, University Hospital Würzburg, Germany.

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

28111135

Citation

Schwindling, Franz Sebastian, et al. "Fracture Resistance of Glazed, Full-contour ZLS Incisor Crowns." Journal of Prosthodontic Research, vol. 61, no. 3, 2017, pp. 344-349.
Schwindling FS, Rues S, Schmitter M. Fracture resistance of glazed, full-contour ZLS incisor crowns. J Prosthodont Res. 2017;61(3):344-349.
Schwindling, F. S., Rues, S., & Schmitter, M. (2017). Fracture resistance of glazed, full-contour ZLS incisor crowns. Journal of Prosthodontic Research, 61(3), 344-349. https://doi.org/10.1016/j.jpor.2016.12.008
Schwindling FS, Rues S, Schmitter M. Fracture Resistance of Glazed, Full-contour ZLS Incisor Crowns. J Prosthodont Res. 2017;61(3):344-349. PubMed PMID: 28111135.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Fracture resistance of glazed, full-contour ZLS incisor crowns. AU - Schwindling,Franz Sebastian, AU - Rues,Stefan, AU - Schmitter,Marc, Y1 - 2017/01/19/ PY - 2016/08/25/received PY - 2016/11/14/revised PY - 2016/12/23/accepted PY - 2017/1/24/pubmed PY - 2017/11/29/medline PY - 2017/1/24/entrez KW - Ceramics KW - Crowns KW - Feldspar KW - Fracture load KW - Lithium disilicate KW - Permanent dental restoration SP - 344 EP - 349 JF - Journal of prosthodontic research JO - J Prosthodont Res VL - 61 IS - 3 N2 - PURPOSE: To compare the failure behaviour of zirconia-reinforced lithium silicate (Celtra Duo, DeguDent) with that of lithium disilicate (IPS e.max CAD, Ivoclar Vivadent) and feldspar (Mark II, VITA) ceramics. METHODS: Three groups of sixteen glazed maxillary incisor crowns were produced. The inner surfaces of the crowns were etched, then luted to metal dies with self-adhesive cement. Single load-to-failure tests were performed before and after thermo-mechanical ageing. To simulate clinical conditions, the specimens were thermocycled (10,000 cycles between 6.5°C and 60°C) and underwent chewing simulation (1,200,000 cycles, Fmax=86N). Statistical analyses were performed by use of non-parametric Kruskal-Wallis and Mann-Whitney U-tests. RESULTS: Before ageing, all the monolithic incisor crowns fractured at test forces >285N. Mean fracture loads were highest for zirconia-reinforced lithium silicate (725N, SD 162N), slightly lower for lithium disilicate (701N, SD 276N), and lowest for feldspar (554N, SD 190N). The differences between the results were not statistically significant. After ageing, fracture resistance decreased for all materials except zirconia-reinforced lithium silicate. Mean fracture loads were highest for zirconia-reinforced lithium silicate (766N, SD 98N) and significantly lower for both lithium disilicate (485N, SD 64N) and feldspar (372N, SD 116N). CONCLUSION: Monolithic restorations fabricated from zirconia-reinforced lithium silicate retain high fracture resistance after extensive thermo-mechanical ageing. This preclinical study suggests that cohesive failures of monolithic anterior crowns produced of these ceramics will not be a major problem in dental practice. SN - 2212-4632 UR - https://www.unboundmedicine.com/medline/citation/28111135/Fracture_resistance_of_glazed_full_contour_ZLS_incisor_crowns_ DB - PRIME DP - Unbound Medicine ER -