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Zirconia-reinforced lithium silicate crowns: Effect of thickness on survival and failure mode.
Dent Mater 2019; 35(7):1007-1016DM

Abstract

OBJECTIVE

To evaluate the reliability and failure mode of zirconia-reinforced lithium silicate (ZLS) molar crowns of different thicknesses.

METHODS

Monolithic ZLS molar crowns (0.5mm, 1.0mm, and 1.5 mm thickness) were modeled and milled using a CAD/CAM system (n = 21/group). Crowns were cemented on dentin-like epoxy resin replicas with a resin cement. The specimens were subjected to single load-to-failure test for step-stress profiles designing. Mouth-motion step-stress accelerated-life test was performed under water by sliding an indenter 0.7 mm lingually down on the distobuccal cusp until specimen fracture or suspension. Use level probability Weibull curves and reliability were calculated and plotted. Polarized-light optical microscope and scanning electron microscope (SEM) were used to characterize fracture patterns.

RESULTS

Irrespective of crown thickness, beta (β) values were higher than 1 and fatigue accelerated failures. While 0.5 mm ZLS crowns exhibited a significant reduction in the probability of survival at 200N, 300N and 400 N mission loads (69%, 41% and 19%, respectively), no significant difference was observed between 1.0 mm and 1.5 mm crowns. Both thicknesses have maintained the survivability at approximately 90%. Failure primarily comprised bulk fracture where radial cracks originated from the cementation surface beneath the indenter loading trail and propagated towards the cervical margin.

SIGNIFICANCE

1.5 mm- and 1.0 mm-thickness monolithic ZLS crowns presented higher probability of survival compared to 0.5 mm crowns. Bulk fracture was the chief failure mode, regardless of thickness.

Authors+Show Affiliations

Department of Prosthodontics and Periodontology, University of Campinas - Piracicaba Dental School, Piracicaba, SP, Brazil.Department of Restorative Dentistry, Universus Veritas UNG, Guarulhos, SP, Brazil.Department of Prosthodontics and Periodontology, University of São Paulo - Bauru School of Dentistry, Bauru, SP, Brazil.Department of Prosthodontics and Periodontology, University of São Paulo - Bauru School of Dentistry, Bauru, SP, Brazil.Department of Prosthodontics and Periodontology, University of Campinas - Piracicaba Dental School, Piracicaba, SP, Brazil.Departament of Biomaterials and Biomimetics, New York University College of Dentistry, New York, NY, USA; Graduate Program in Dentistry, Positivo University, Curitiba, PR, Brazil.Departament of Biomaterials and Biomimetics, New York University College of Dentistry, New York, NY, USA.Department of Prosthodontics and Periodontology, University of São Paulo - Bauru School of Dentistry, Bauru, SP, Brazil.Departament of Biomaterials and Biomimetics, New York University College of Dentistry, New York, NY, USA; Hansjörg Wyss Department of Plastic Surgery, New York University Langone Healthy School of Medicine, New York, NY, USA; Mechanical and Aerospace Engineering, New York University Tandon School of Engineering, New York, NY, USA.Department of Prosthodontics and Periodontology, University of Campinas - Piracicaba Dental School, Piracicaba, SP, Brazil. Electronic address: delbelcury@gmail.com.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31064670

Citation

Bergamo, Edmara T P., et al. "Zirconia-reinforced Lithium Silicate Crowns: Effect of Thickness On Survival and Failure Mode." Dental Materials : Official Publication of the Academy of Dental Materials, vol. 35, no. 7, 2019, pp. 1007-1016.
Bergamo ETP, Bordin D, Ramalho IS, et al. Zirconia-reinforced lithium silicate crowns: Effect of thickness on survival and failure mode. Dent Mater. 2019;35(7):1007-1016.
Bergamo, E. T. P., Bordin, D., Ramalho, I. S., Lopes, A. C. O., Gomes, R. S., Kaizer, M., ... Del Bel Cury, A. A. (2019). Zirconia-reinforced lithium silicate crowns: Effect of thickness on survival and failure mode. Dental Materials : Official Publication of the Academy of Dental Materials, 35(7), pp. 1007-1016. doi:10.1016/j.dental.2019.04.007.
Bergamo ETP, et al. Zirconia-reinforced Lithium Silicate Crowns: Effect of Thickness On Survival and Failure Mode. Dent Mater. 2019;35(7):1007-1016. PubMed PMID: 31064670.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Zirconia-reinforced lithium silicate crowns: Effect of thickness on survival and failure mode. AU - Bergamo,Edmara T P, AU - Bordin,Dimorvan, AU - Ramalho,Ilana S, AU - Lopes,Adolfo C O, AU - Gomes,Rafael S, AU - Kaizer,Marina, AU - Witek,Lukasz, AU - Bonfante,Estevam A, AU - Coelho,Paulo G, AU - Del Bel Cury,Altair A, Y1 - 2019/05/04/ PY - 2018/12/01/received PY - 2019/02/12/revised PY - 2019/04/12/accepted PY - 2019/5/9/pubmed PY - 2019/5/9/medline PY - 2019/5/9/entrez KW - Ceramic KW - Crowns KW - Fatigue KW - Zirconia-reinforced lithium silicate SP - 1007 EP - 1016 JF - Dental materials : official publication of the Academy of Dental Materials JO - Dent Mater VL - 35 IS - 7 N2 - OBJECTIVE: To evaluate the reliability and failure mode of zirconia-reinforced lithium silicate (ZLS) molar crowns of different thicknesses. METHODS: Monolithic ZLS molar crowns (0.5mm, 1.0mm, and 1.5 mm thickness) were modeled and milled using a CAD/CAM system (n = 21/group). Crowns were cemented on dentin-like epoxy resin replicas with a resin cement. The specimens were subjected to single load-to-failure test for step-stress profiles designing. Mouth-motion step-stress accelerated-life test was performed under water by sliding an indenter 0.7 mm lingually down on the distobuccal cusp until specimen fracture or suspension. Use level probability Weibull curves and reliability were calculated and plotted. Polarized-light optical microscope and scanning electron microscope (SEM) were used to characterize fracture patterns. RESULTS: Irrespective of crown thickness, beta (β) values were higher than 1 and fatigue accelerated failures. While 0.5 mm ZLS crowns exhibited a significant reduction in the probability of survival at 200N, 300N and 400 N mission loads (69%, 41% and 19%, respectively), no significant difference was observed between 1.0 mm and 1.5 mm crowns. Both thicknesses have maintained the survivability at approximately 90%. Failure primarily comprised bulk fracture where radial cracks originated from the cementation surface beneath the indenter loading trail and propagated towards the cervical margin. SIGNIFICANCE: 1.5 mm- and 1.0 mm-thickness monolithic ZLS crowns presented higher probability of survival compared to 0.5 mm crowns. Bulk fracture was the chief failure mode, regardless of thickness. SN - 1879-0097 UR - https://www.unboundmedicine.com/medline/citation/31064670/Zirconia-reinforced_lithium_silicate_crowns:_Effect_of_thickness_on_survival_and_failure_mode L2 - https://linkinghub.elsevier.com/retrieve/pii/S0109-5641(18)31390-3 DB - PRIME DP - Unbound Medicine ER -