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Extended glaze firings for porcelain-veneered zirconia: Effects on the mechanical and optical behavior.
Rodrigues, Camila da Silva; Aurélio, Iana Lamadrid; Fraga, Sara; Kaizer, Marina da Rosa; Zhang, Yu; May, Liliana Gressler.
Afiliação
  • Rodrigues CDS; Graduate Program in Dental Sciences, Federal University of Santa Maria, 1000 Roraima Av., T Street, Building 26F, 97105-900 Santa Maria, RS, Brazil.
  • Aurélio IL; Graduate Program in Dental Sciences, Federal University of Santa Maria, 1000 Roraima Av., T Street, Building 26F, 97105-900 Santa Maria, RS, Brazil.
  • Fraga S; Department of Conservative Dentistry, Federal University of Rio Grande do Sul, 2492 Ramiro Barcelos Street, 90035-003, Porto Alegre, RS, Brazil.
  • Kaizer MDR; Graduate Program in Dentistry, Positivo University, 5300 Prof. Pedro Viriato Parigot de Souza Street, 81280-330, Curitiba, PR, Brazil.
  • Zhang Y; Department of Preventive and Restorative Sciences, University of Pennsylvania, 240 S. 40th Street, Levy 109, Philadelphia, PA 19104, USA.
  • May LG; Department of Restorative Dentistry, Federal University of Santa Maria, 1000 Roraima Av., T Street, Building 26F, 97105-900 Santa Maria, RS, Brazil. Electronic address: liligmay@gmail.com.
Dent Mater ; 37(7): 1096-1106, 2021 07.
Article em En | MEDLINE | ID: mdl-33865620
OBJECTIVE: This study evaluated the effect of dwell time (conventional or extended) and cooling protocol (fast or slow) of self-glaze firings on the mechanical (flexural strength and crack propagation) and optical (color and translucency) properties of a porcelain-veneered zirconia system. METHODS: Bilayer disc-shaped samples were prepared (Vita VM9 + In-Ceram YZ) and divided according to the final thermal treatment: glaze firing followed by slow cooling (furnace opening at 200 °C) (G-S) or fast cooling (furnace opening at 600 °C) (G-F, manufacturer-recommended protocol), extended glaze firing (15 min of dwell time) followed by slow cooling (EG-S) or fast cooling (EG-F), or no thermal treatment (CTRL). Porcelain roughness (Ra and Rz) was measured before and after glaze firings. Color (ΔE00) and translucency (TP00) alteration were also evaluated. Flexural strength was measured with the piston-on-three-ball test and crack propagation analysis was performed after Vickers indentations. Complementary analyzes of crystalline phase and scanning electron microscopy were carried out. RESULTS: Significant effect of dwell time was observed, with extended glaze leading to higher flexural strength and shorter crack lengths. Cracks of EG groups were observed to end in clusters of crystals. Color and translucency changed below perceptibility thresholds. All treatments led to a smoother surface and EG groups reached the lowest Rz values. An extra SiO2 peak was revealed in control and EG groups. No effect of cooling protocol was found. SIGNIFICANCE: Extended glaze firing was able to improve the resistance to crack initiation and propagation of porcelain-veneered zirconia without clinically perceptible changes in optical properties.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Dióxido de Silício / Porcelana Dentária Tipo de estudo: Guideline Idioma: En Revista: Dent Mater Assunto da revista: ODONTOLOGIA Ano de publicação: 2021 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido
Texto completo
Adicionar na Minha BVS
Imprimir
XML
PubMed Links
Buscar no Google

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Dióxido de Silício / Porcelana Dentária Tipo de estudo: Guideline Idioma: En Revista: Dent Mater Assunto da revista: ODONTOLOGIA Ano de publicação: 2021 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido