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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Strength of 3Y-TZP and feldspathic porcelain subjected to different cooling methods

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Author(s):
Antonio Alves de Almeida-Júnior ; Diogo Longhini ; Beatriz Regalado Galvão ; Claudinei dos Santos ; Gelson Luis Adabo
Total Authors: 5
Document type: Journal article
Source: Braz. J. Oral Sci.; v. 13, n. 2, p. 124-128, Abr. 2014.
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. (AU)

FAPESP's process: 09/17735-8 - Effect of different cooling rates on a feldspathic ceramic veneer for zirconia core
Grantee:Antonio Alves de Almeida Junior
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 10/05469-9 - Characterization of feldspathic ceramic veneer for zirconia core submitted to different cooling rates
Grantee:Gelson Luis Adabo
Support type: Regular Research Grants