Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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Effect of organic acids in dental biofilm on microhardness of a silorane-based composite

  • Hashemikamangar, Sedighe Sadat (Department of Operative Dentistry, Dental School, Tehran University of Medical Sciences, International Campus) ;
  • Pourhashemi, Seyed Jalal (Department of Pediatric Dentistry, Dental School, Tehran University of Medical Sciences, International Campus) ;
  • Talebi, Mohammad (Tehran University of Medical Sciences, International Campus, Dental School) ;
  • Kiomarsi, Nazanin (Department of Operative Dentistry, Dental School, Tehran University of Medical Sciences, International Campus) ;
  • Kharazifard, Mohammad Javad (Department of Epidemiology and Biostatistics, Faculty of Public Health, Tehran University of Medical Sciences)
  • Received : 2014.06.15
  • Accepted : 2015.02.05
  • Published : 2015.08.31
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Abstract

Objectives: This study evaluated the effect of lactic acid and acetic acid on the microhardness of a silorane-based composite compared to two methacrylate-based composite resins. Materials and Methods: Thirty disc-shaped specimens each were fabricated of Filtek P90, Filtek Z250 and Filtek Z350XT. After measuring of Vickers microhardness, they were randomly divided into 3 subgroups (n = 10) and immersed in lactic acid, acetic acid or distilled water. Microhardness was measured after 48 hr and 7 day of immersion. Data were analyzed using repeated measures ANOVA (p < 0.05). The surfaces of two additional specimens were evaluated using a scanning electron microscope (SEM) before and after immersion. Results: All groups showed a reduction in microhardness after 7 day of immersion (p < 0.001). At baseline and 7 day, the microhardness of Z250 was the greatest, followed by Z350 and P90 (p < 0.001). At 48 hr, the microhardness values of Z250 and Z350 were greater than P90 (p < 0.001 for both), but those of Z250 and Z350 were not significantly different (p = 0.095). Also, the effect of storage media on microhardness was not significant at baseline, but significant at 48 hr and after 7 day (p = 0.001 and p < 0.001, respectively). Lactic acid had the greatest effect. Conclusions: The microhardness of composites decreased after 7 day of immersion. The microhardness of P90 was lower than that of other composites. Lactic acid caused a greater reduction in microhardness compared to other solutions.

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References

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