Amaral M, Campos TMB, Takahashi T, Moura GSD, Ramos GF, Melo RMD, Özcan M. Water as Veneering
Modeling Liquid Affects Microhardness of Glassy Matrix Veneering Ceramic.
Eur J Prosthodont Restor Dent 2022;
30:262-266. [PMID:
35333011 DOI:
10.1922/ejprd_2372amaral05]
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Abstract
PURPOSE/AIM
To evaluate the effect of different veneering liquids used for modeling on microhardness, fracture toughness and biaxial flexural strength of a glass-veneering ceramic.
MATERIAL AND METHODS
The manufacturer recommended modeling liquid (ML), distilled water (DW), isopropyl alcohol (IA), 0.5% (P05), 1% (P1), and 2% (P2) polyethylene glycol solutions were mixed with feldspathic ceramic powder to form disc-shaped samples (n=20, 15 mm × 1.2 mm). After sintering, samples were mirror-polished and subjected to Vickers indentation (n=5) for measurement of microhardness and fracture toughness. The remaining 15 samples from each group were subjected to biaxial flexural strength. Data were subjected to one-way ANOVA and Weibull analysis.
RESULTS
The microhardness was affected by veneering liquid (p=0.002): DW promoted higher microhardness values than ML and IA. Fracture toughness (p=0.301) and flexural strength (p=0.930) were not affected by the veneering liquid but Weibull parameters were affected. All groups presented surface pores under high magnification.
CONCLUSION
Even though the use of DW led to higher values of surface microhardness than the ML, all obtained values are inside the range of enamel microhardness values reported in the literature. Such parameters may affect antagonist wear and should be reported in clinical trials.
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