Comparison of mechanical properties of different reinforced glass-ceramics

Felicitas Mayinger; Nina Lümkemann; Martyna Musik; Marlis Eichberger; Bogna Stawarczyk

doi:10.1016/j.prosdent.2020.06.027

Comparison of mechanical properties of different reinforced glass-ceramics

J Prosthet Dent. 2022 Jan;127(1):146-153. doi: 10.1016/j.prosdent.2020.06.027. Epub 2020 Nov 7.

Authors

Felicitas Mayinger¹, Nina Lümkemann², Martyna Musik², Marlis Eichberger³, Bogna Stawarczyk⁴

Affiliations

¹ Research Associate, Department of Prosthetic Dentistry, University Hospital, LMU Munich, Munich, Germany. Electronic address: felicitas.wiedenmann@med.uni-muenchen.de.
² Research Associate, Department of Prosthetic Dentistry, University Hospital, LMU Munich, Munich, Germany.
³ Dental Technician, Department of Prosthetic Dentistry, University Hospital, LMU Munich, Munich, Germany.
⁴ Head of Dental Material Research, Department of Prosthetic Dentistry, University Hospital, LMU Munich, Munich, Germany.

PMID: 33168175
DOI: 10.1016/j.prosdent.2020.06.027

Abstract

Statement of problem: Data concerning the mechanical properties of the newly developed lithium disilicate ceramic HS10PC are lacking.

Purpose: The purpose of this in vitro study was to investigate the flexural strength (FS), Martens hardness (HM), indentation modulus (E_IT), fracture load (FL), and wear resistance (WR) of HS10PC compared with those of the established glass-ceramics IPS e.max Press and IPS Empress Esthetic.

Material and methods: Four pressable glass-ceramics were examined: HS10PC (estetic ceram ag), IPS e.max Press low translucency (LT) and high translucency (HT; Ivoclar Vivadent AG), and IPS Empress Esthetic (ES; Ivoclar Vivadent AG). For each material, a total of 85 specimens were fabricated. Specimens were subdivided into 4 groups for FS (n=30), HM, E_IT (n=10), and FL measurement according to the Voss test after artificial aging in an autoclave (n=15), artificial aging in a mastication simulator (n=15), and no artificial aging (n=15). In addition, WR (n=10) was measured after 240 000, 600 000, and 1 200 000 masticatory cycles. Data were statistically analyzed using the global univariate ANOVA, the Scheffé post hoc and paired t tests, and Weibull distribution (α=.05).

Results: HT showed the highest FS, while ES presented the lowest FS of all groups (P<.001). ES showed lower values for HM (P<.001), E_IT (P<.001), and FL for specimens treated in an autoclave and mastication simulator (P<.001) compared with all other groups. An increase in the wear of the ceramic and enamel antagonist between 240 000 and 1 200 000 masticatory cycles was observed for all groups (P<.001). After 1 200 000 masticatory cycles, HS10PC presented less wear of the ceramic than the other 3 materials (P=.003).

Conclusions: The newly developed lithium disilicate ceramic HS10PC showed comparable results with the established IPS e.max Press for FS, HM, E_IT, FL, and WR. Lithium disilicate ceramics presented higher mechanical results than the leucite-reinforced ES, with all the ceramics showing similar results for the WR of the enamel antagonist.

MeSH terms

Ceramics
Dental Porcelain*
Esthetics, Dental*
Flexural Strength
Materials Testing
Surface Properties

Substances

Dental Porcelain