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Comparative study of the surface roughness of Ormocer-based and conventional composites.

Leonardo Gonçalves Cunha1, Roberta Caroline Bruschi Alonso, Paulo Henrique Dos Santos

  • 1Dental Materials Area, Piracicaba School of Dentistry, State University of Campinas, Brazil.

Journal of Applied Oral Science : Revista FOB
|March 12, 2011
PubMed
Summary

This study assessed resin composite surface roughness after toothbrushing. Ormocer-based composites showed increased roughness, similar to conventional ones, indicating potential wear concerns for dental restorations.

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Area of Science:

  • Dental Materials Science
  • Polymer Chemistry

Background:

  • Resin composites are widely used in dental restorations.
  • Surface properties of dental materials influence their longevity and aesthetic outcomes.
  • Ormocer-based composites offer potential advantages but require evaluation of their mechanical properties.

Purpose of the Study:

  • To compare the surface roughness of two Ormocer-based resin composites (Admira, Definite) with conventional composites (Z250, A110) before and after mechanical toothbrushing.
  • To evaluate the effect of mechanical toothbrushing on the surface integrity of different resin composite materials.

Main Methods:

  • Eight samples of each composite material were prepared and polished.
  • Initial surface roughness (Ra) was measured using a profilometer.
  • Samples underwent 30,000 cycles of mechanical toothbrushing.
  • Final surface roughness was measured post-toothbrushing.
  • Statistical analysis was performed using ANOVA and Tukey's test.

Main Results:

  • Admira showed significantly higher initial surface roughness compared to A110.
  • No significant differences in initial roughness were found between Definite, Z250, and other composites.
  • After toothbrushing, all composites exhibited a statistically significant increase in surface roughness.
  • No significant differences in final surface roughness were observed among the four composite materials.

Conclusions:

  • Mechanical toothbrushing significantly increases the surface roughness of both Ormocer-based and conventional resin composites.
  • Ormocer-based composites (Admira, Definite) demonstrated comparable surface roughness changes to conventional composites (Z250, A110) after simulated toothbrushing.
  • The findings suggest that surface roughness progression under mechanical wear is a common characteristic across these restorative materials.