Zirconia toughened mica glass ceramics for dental restorations: Wear, thermal, optical and cytocompatibility properties

Gali, Sivaranjani and RaviKumar, K (2019) Zirconia toughened mica glass ceramics for dental restorations: Wear, thermal, optical and cytocompatibility properties. In: DENTAL MATERIALS, 35 (12). pp. 1706-1717.

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Abstract

Background. In an effort to design novel zirconia reinforced mica glass ceramics for dental restorations, clinically relevant properties such as wear, coefficient of thermal expansion, optical transmittance, and cytocompatibility with human gingival fibroblast cell lines were investigated in the present study. Materials & Methods. Microstructure analysis of two body wear of heat treated mica glass ceramic ceramics (47.2 SiO2-16.7 Al2O3-9.5 K2O-14.5 MgO-8.5 B2O3-6.3 F wt.%) reinforced with 20 wt.% YSZ, were evaluated against a steatite antagonist in a chewing simulator following Willytec Munich method. In addition, Coefficient of thermal expansion (CTE), total transmittance, scattering coefficient and cytocompatibility on human gingival fibroblast cell lines were performed and compared to the commercially available dental ceramic systems. Results. The experimental mica glass ceramic demonstrate micro-ploughing, pull out and debris formation along the cutting surface, indicating abrasive wear mechanism. Thermal expansion of mica glass ceramic composite was recorded as 5 x 10(-6)/degrees C, which is lower than the thermal expansion of commercially available core and veneering ceramics. Further, significant differences of transmittance and scattering coefficient of mica glass ceramics with 20 wt.% YSZ with commercial dental ceramics was found and extensive fibroblast cell spreading with filopodial extension, cell-to-cell bridges and proliferation with human gingival fibroblast cell lines. Conclusion. With acceptable cytocompatibility with human gingival fibroblast cells and better wear properties with respect to commercial IPS emax Press, the mica glass ceramic composites (47.2 SiO2-16.7 Al2O3-9.5 K2O-14.5 MgO-8.5 B2O3-6.3 F wt.%) with 20 wt.% YSZ have the potential for dental restorative applications as machinable veneering ceramics.

Item Type:	Journal Article
Publication:	DENTAL MATERIALS
Publisher:	ELSEVIER SCI LTD
Additional Information:	Copyright of this article belongs to ELSEVIER SCI LTD
Keywords:	Zirconia; Coefficient of thermal expansion; Cytocompatibility; Dental ceramics; Mica glass ceramics; Wear resistance; Transmittance; Scattering coefficient
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	14 Feb 2020 11:51
Last Modified:	14 Feb 2020 11:51
URI:	http://eprints.iisc.ac.in/id/eprint/64090

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