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Mayinger, Felicitas; Lumkemann, Nina; Musik, Martyna; Eichberger, Marlis and Stawarczyk, Bogna (2022): Comparison of mechanical properties of different reinforced glass-ceramics. In: Journal of Prosthetic Dentistry, Vol. 127, No. 1: pp. 146-153

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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 (EIT), 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, EIT (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 240000, 600000, and 1 200 000 masticatory cycles. Data were statistically analyzed using the global univariate ANOVA, the Scheffe post hoc and paired t tests, and Weibull distribution (a=.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), EIT (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 200000 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, EIT, 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.

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