The effect of polishing techniques on the surface roughness of a feldspathic porcelain

Authors

  • Mario Cezar Oliveira Universidade Estadual de Feira de Santana
  • Alex Correia Vieira Universidade Federal da Bahia
  • Carolina Baptista Miranda UNIME
  • Márcia Sepúlveda Noya Universidade Estadual de Feira de Santana

Keywords:

Ceramic, roughness, polishing techniques

Abstract

Purpose: This in vitro study compared the effect of four different polishing methods on the surface roughness of a feldspathic dental porcelain. Methods: Forty disc-shaped specimens were fabricated with a feldspathic porcelain (Super Porcelain EX3), glazed, and randomly divided into 4 experimental groups and 1 control group (n=8/group). For the experimental groups, the glazed layer was ground with a diamond rotary instrument, and the surface was polished with: rubber points (Edenta), steel finishing burs (Meisinger), silicon rubber point (Shofu) + diamond felt wheel (FGM) + diamond paste (Diamond Excel, FGM), or aluminum oxide discs (Sof-Lex, 3M-ESPE) + diamond felt wheel + diamond paste. Surface roughness (Ra) was measured profilometrically. Data were analyzed by analysis of variance and Tukey test (α=5%). Results: The Ra values were not statistically different among the four polishing groups (P>0.05). All polishing groups had significantly higher mean Ra values than the control glazed specimens (P<0.001). Conclusion: Within the limitations of this study, the results indicate that the tested polishing techniques were not able to provide a porcelain surface as smooth as the glazed surface. Key words: Ceramic; roughness; polishing techniques

Author Biographies

Mario Cezar Oliveira, Universidade Estadual de Feira de Santana

Mestrando em Odontologia Clínica pela FBDC/Ba, Professor Auxiliar da Área de Prótese Dentária da Universidade Estadual de Feira de Santana, Bahia.

Alex Correia Vieira, Universidade Federal da Bahia

Mestrando em Odontologia Clínica pela FBDC/Ba, Professor Substituto de Dentística da Universidade Federal da Bahia.

Carolina Baptista Miranda, UNIME

Doutora em Dentística pela UNESP, Professora Adjunta de Dentística e Clínica Integrada da União Metropolitana de Educação e Cultura / UNIME

Márcia Sepúlveda Noya, Universidade Estadual de Feira de Santana

Doutora em Laser pela UFBA, Professora Adjunta de Dentística da Universidade Estadual de Feira de Santana, Bahia.

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Published

2008-08-19

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Section

Original Article