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

Authors

  • Antonio Alves de Almeida-Júnior Universidade Tiradentes – UNIT
  • Diogo Longhini Universidade Estadual Paulista – UNESP
  • Beatriz Regalado Galvão Universidade Potiguar - UnP
  • Claudinei dos Santos Universidade do Estado do Rio de Janeiro – UERJ
  • Gelson Luis Adabo Universidade Estadual Paulista – UNESP

DOI:

https://doi.org/10.20396/bjos.v13i2.8640908

Keywords:

Dental porcelain, Zirconium, Material resistance

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.

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Author Biographies

Antonio Alves de Almeida-Júnior, Universidade Tiradentes – UNIT

Universidade Tiradentes – UNIT, School of Dentistry, Department of Oral Rehabilitation, Aracaju, SE.

Diogo Longhini, Universidade Estadual Paulista – UNESP

Universidade Estadual Paulista – UNESP, School of Dentistry, Department of Dental Materials and Prosthodontics, Araraquara, SP.

Beatriz Regalado Galvão, Universidade Potiguar - UnP

Universidade Potiguar - UnP, School of Dentistry, Department of Oral Rehabilitation, Natal, RN.

Claudinei dos Santos, Universidade do Estado do Rio de Janeiro – UERJ

Universidade do Estado do Rio de Janeiro – UERJ, Resende School of Technology, Department of Engineering Materials, Resende, RJ.

Gelson Luis Adabo, Universidade Estadual Paulista – UNESP

Universidade Estadual Paulista – UNESP, School of Dentistry, Department of Dental Materials and Prosthodontics, Araraquara, SP.

Published

2015-10-07

How to Cite

1.
Almeida-Júnior AA de, Longhini D, Galvão BR, Santos C dos, Adabo GL. Strength of 3Y-TZP and feldspathic porcelain subjected to different cooling methods. Braz. J. Oral Sci. [Internet]. 2015 Oct. 7 [cited 2022 Oct. 6];13(2):124-8. Available from: https://periodicos.sbu.unicamp.br/ojs/index.php/bjos/article/view/8640908

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