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Brazilian Journal of Oral Sciences
Piracicaba Dental School - UNICAMP
EISSN: 1677-3225
Vol. 13, No. 2, 2014, pp. 124-128
Bioline Code: os14024
Full paper language: English
Document type: Research Article
Document available free of charge

Brazilian Journal of Oral Sciences, Vol. 13, No. 2, 2014, pp. 124-128

 en Strength of 3Y-TZP and feldspathic porcelain subjected to different cooling methods
de Almeida-Júnior, Antonio Alves; Longhini, Diogo; Galvão, Beatriz Regalado; dos Santos, Claudinei & Adabo, Gelson Luis

Abstract

Aim: To investigate the effect of the cooling rate on flexural strength of monolayer and bilayer porcelain/zirconia (Y-TZP) bars. Methods: Forty-five specimens were made for each design group: (PM) monolithic specimens of veneer porcelain Vita VM9 (Vita, Germany); (ZM) monolithic specimens of zirconia (ZiHP; ProtMat, Brazil); (PB) bilayer specimens zirconia/porcelain with porcelain on lower surface; and (ZB) bilayer specimens porcelain/zirconia with zirconia on lower surface. Each group was cooled by three different methods after porcelain sintering: slow – specimens were cooled inside the turned-off furnace; normal – specimens were removed from the furnace and cooled in air at room temperature; and fast – specimens were removed from the furnace at 910°C and cooled by compressed air for 10 s. Specimens were polished and flexural strength was measured in water at 37 °C (n=15). Maximum load at fracture was recorded, and equations for simple (monolayer) and composite (bilayer) structures were used to calculate the flexural strength. Results were analyzed using one-way ANOVA (p<0.05) and Tukey test separately for each design. Results: The results of one-way ANOVA were statistically significant only for the PB group. The post-hoc Tukey test showed the highest flexural strength for fast cooling and the lowest for slow cooling; the normal cooling was statistically similar to both. Conclusions: Cooling methods affected only the flexural strength of bilayer specimens with porcelain on low surface (under tension) when the slow cooling method was used.

Keywords
dental porcelain; zirconium; material resistance

 
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