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Fracture load of ceramic restorations after fatigue loading.
J Prosthet Dent. 2015 Aug; 114(2):266-71.JP

Abstract

STATEMENT OF PROBLEM

A clinician must decide what ceramic coping and veneer material to prescribe based on the amount of tooth reduction possible and the desired esthetic outcome of the restoration.

PURPOSE

The purpose of this in vitro study was to compare the fracture strength of monolithic and bilayered lithium disilicate (IPS e.max) and zirconia (LAVA) crowns at clinically relevant thicknesses after load cycling.

MATERIAL AND METHODS

Crowns (n=8) were fabricated from 6 groups: 1.2-mm monolithic lithium disilicate, 1.5-mm monolithic lithium disilicate, 1.5-mm bilayered lithium disilicate with hand-layered veneer, 0.6 mm monolithic zirconia, 1.2-mm bilayered zirconia with hand-layered veneer, and 1.2-mm bilayered zirconia with milled veneer (dimension represents thickness at the occlusal pit). Crowns were cemented to identical milled resin dies with resin-modified glass ionomer cement. Cemented crowns were stored at 37°C for 24 hours and load cycled for 200,000 cycles at 25 N at a rate of 40 cycles/minute. The ultimate fracture load for each specimen was measured in a universal testing machine. Data were analyzed with a 1-way ANOVA and Tukey honest significant difference post hoc analysis (α=.05).

RESULTS

Mean ±SD fracture load values were 1465 ±330 N for monolithic lithium disilicate (1.2-mm thickness) and 2027 ±365 N (1.5-mm thickness) and 1732 ±315 N for bilayered hand-veneered lithium disilicate (1.5-mm thickness). Fracture loads were 1669 ±311 N for monolithic zirconia crowns (0.6mm thickness), 2625 ±300 N for zirconia milled-veneered (1.2-mm thickness), and 2655 ±590N for zirconia hand-veneered crowns (1.2mm thickness). One-way ANOVA showed a statistically significant difference among the groups (P<.01). Veneered zirconia crowns showed the highest fracture strength, 1.2-mm hand veneered zirconia was similar to that of 1.5-mm monolithic zirconia, and all other groups were not statistically different.

CONCLUSIONS

Crowns of 1.2-mm bilayered zirconia had higher fracture loads than 0.6-mm zirconia or 1.2-mm lithium disilicate monolithic crowns.

Links

Publisher Full Text (DOI)

Authors+Show Affiliations

Baladhandayutham B
Postdoctoral student, Eastman Institute of Oral Health, University of Rochester, Rochester, NY.
Lawson NC
Assistant Professor, Department of Biomaterials, University of Alabama at Birmingham School of Dentistry, Birmingham, Ala. Electronic address: nlawson@uab.edu.
Burgess JO
Professor, Division of Biomaterials, University of Alabama at Birmingham School of Dentistry, Birmingham, Ala.

MeSH

Aluminum SilicatesCementationCeramicsComputer-Aided DesignCrownsDental MaterialsDental PorcelainDental Prosthesis DesignDental Restoration FailureDental Stress AnalysisDental VeneersGlass Ionomer CementsMaterials TestingPotassium CompoundsResin CementsStress, MechanicalSurface PropertiesTemperatureTime FactorsZirconium

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

25985741

Clinical Trial Links

Gingival Inflammatory Response,Bacterial Adhesion and Patient Satisfaction of Ceramo-metallic vs Zirconia Crowns

Citation

Baladhandayutham, Balasudha, et al. "Fracture Load of Ceramic Restorations After Fatigue Loading." The Journal of Prosthetic Dentistry, vol. 114, no. 2, 2015, pp. 266-71.
Baladhandayutham B, Lawson NC, Burgess JO. Fracture load of ceramic restorations after fatigue loading. J Prosthet Dent. 2015;114(2):266-71.
Baladhandayutham, B., Lawson, N. C., & Burgess, J. O. (2015). Fracture load of ceramic restorations after fatigue loading. The Journal of Prosthetic Dentistry, 114(2), 266-71. https://doi.org/10.1016/j.prosdent.2015.03.006
Baladhandayutham B, Lawson NC, Burgess JO. Fracture Load of Ceramic Restorations After Fatigue Loading. J Prosthet Dent. 2015;114(2):266-71. PubMed PMID: 25985741.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Fracture load of ceramic restorations after fatigue loading. AU - Baladhandayutham,Balasudha, AU - Lawson,Nathaniel C, AU - Burgess,John O, Y1 - 2015/05/16/ PY - 2014/09/03/received PY - 2015/03/04/revised PY - 2015/03/04/accepted PY - 2015/5/20/entrez PY - 2015/5/20/pubmed PY - 2017/1/5/medline SP - 266 EP - 71 JF - The Journal of prosthetic dentistry JO - J Prosthet Dent VL - 114 IS - 2 N2 - STATEMENT OF PROBLEM: A clinician must decide what ceramic coping and veneer material to prescribe based on the amount of tooth reduction possible and the desired esthetic outcome of the restoration. PURPOSE: The purpose of this in vitro study was to compare the fracture strength of monolithic and bilayered lithium disilicate (IPS e.max) and zirconia (LAVA) crowns at clinically relevant thicknesses after load cycling. MATERIAL AND METHODS: Crowns (n=8) were fabricated from 6 groups: 1.2-mm monolithic lithium disilicate, 1.5-mm monolithic lithium disilicate, 1.5-mm bilayered lithium disilicate with hand-layered veneer, 0.6 mm monolithic zirconia, 1.2-mm bilayered zirconia with hand-layered veneer, and 1.2-mm bilayered zirconia with milled veneer (dimension represents thickness at the occlusal pit). Crowns were cemented to identical milled resin dies with resin-modified glass ionomer cement. Cemented crowns were stored at 37°C for 24 hours and load cycled for 200,000 cycles at 25 N at a rate of 40 cycles/minute. The ultimate fracture load for each specimen was measured in a universal testing machine. Data were analyzed with a 1-way ANOVA and Tukey honest significant difference post hoc analysis (α=.05). RESULTS: Mean ±SD fracture load values were 1465 ±330 N for monolithic lithium disilicate (1.2-mm thickness) and 2027 ±365 N (1.5-mm thickness) and 1732 ±315 N for bilayered hand-veneered lithium disilicate (1.5-mm thickness). Fracture loads were 1669 ±311 N for monolithic zirconia crowns (0.6mm thickness), 2625 ±300 N for zirconia milled-veneered (1.2-mm thickness), and 2655 ±590N for zirconia hand-veneered crowns (1.2mm thickness). One-way ANOVA showed a statistically significant difference among the groups (P<.01). Veneered zirconia crowns showed the highest fracture strength, 1.2-mm hand veneered zirconia was similar to that of 1.5-mm monolithic zirconia, and all other groups were not statistically different. CONCLUSIONS: Crowns of 1.2-mm bilayered zirconia had higher fracture loads than 0.6-mm zirconia or 1.2-mm lithium disilicate monolithic crowns. SN - 1097-6841 UR - https://www.unboundmedicine.com/medline/citation/25985741/Fracture_load_of_ceramic_restorations_after_fatigue_loading_ DB - PRIME DP - Unbound Medicine ER -