Effect of feldspar porcelain coating upon the wear behavior of zirconia dental crowns

• Published in: Wear Vol. 297; no. 1-2; pp. 872 - 877
• Main Authors: Figueiredo-Pina, C.G., Monteiro, A., Guedes, M., Maurício, A., Serro, A.P., Ramalho, A., Santos, C.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15-01-2013; Elsevier
• Subjects: Biotribology; Coating; Condensed matter: structure, mechanical and thermal properties; Cusps; Dental materials; Exact sciences and technology; Feldspar coating; Feldspars; Mechanical and acoustical properties of condensed matter; Mechanical properties of solids; Physics; Plates; Porcelain; Sliding wear; Teeth; Tribology and hardness; Wear; Zirconia; Zirconium dioxide; Zirconia; Feldspar coating; Sliding wear; Biotribology; Teeth; Dental application; Roughness; Friction factor; Contact angle; Wear testing; Coatings; Optical microscopy; Porcelain; Zirconium oxide; Feldspars; Profilometry
• ISSN: 0043-1648; 1873-2577
• DOI: 10.1016/j.wear.2012.10.016

Opposing dental surfaces, both natural teeth and restoration materials, are submitted to wear. The effect of the presence of feldspar porcelain coating upon the wear properties of dental zirconia opposing human teeth was evaluated using pin-on-plate test geometry. Human molar cusps performed as pins, coated and uncoated commercial zirconia performed as plates. Tests were carried out at room temperature in citric acid solution during 21,600 cycles, using 1Hz, 1.96N and 5mm amplitude. Wear loss was measured by weighing the cusps before and after testing. The material loss of the plates was assessed by profilometry. Surface roughness and hydrophilicity of the plates' surfaces were evaluated by roughness and contact angle measurements.
Results show higher mass loss for teeth tested against feldspar veneered plates, together with higher friction coefficient. No wear was detected on unveneered zirconia surfaces. Contact angle results show distinct affinity of veneered (25°) and unveneered zirconia (70°) surfaces towards distilled water.
Porcelain coating of zirconia dental crowns affects tooth/crown wear behavior, resulting in increased wear of both the artificial crown and the opposing natural teeth. Coating should therefore be avoided in occlusal crown surfaces.
► Porcelain coating of zirconia dental crowns affects tooth/crown wear behavior. ► Coating results in increased wear of the artificial crown and of opposing teeth. ► No significant wear was detected for uncoated zirconia plates. ► Crowns' coating should be avoided in occlusal dental surfaces.