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Surface roughness in ceramics with different finishing techniques using atomic force microscope and profilometer.

Beatriz Tholt de Vasconcellos1, Walter Gomes Miranda-Júnior, Rodrigo Prioli

  • 1Department of Dentistry, University of São Paulo, Brazil. biatholt@usp.br

Operative Dentistry
|August 24, 2006
PubMed
Summary
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This study evaluated ceramic polishing kits, finding some achieve smoothness comparable to glazed surfaces. However, atomic force microscopy revealed limitations in achieving comparable surface smoothness with certain polishing systems.

Area of Science:

  • Dental Materials Science
  • Surface Engineering
  • Biomaterials

Background:

  • Finishing and polishing are crucial steps in dental ceramic restorations.
  • Achieving optimal surface smoothness is vital for esthetics and longevity.
  • Evaluating the efficacy of various polishing systems is essential for clinical practice.

Purpose of the Study:

  • To assess the finishing and polishing effectiveness of three ceramic materials.
  • To compare the surface roughness achieved by different commercial intraoral polishing kits.
  • To evaluate the performance of polishing systems against a glazed surface benchmark.

Main Methods:

  • Three ceramic materials (Vitadur Alpha, IPS Empress 2, AllCeram) were used.
  • Specimens were subjected to five finishing/polishing procedures, including glazing and various polishing kits.

Related Experiment Videos

  • Surface roughness was quantitatively measured using a stylus profilometer and atomic force microscopy (AFM), analyzing Ra and Ry parameters.
  • Main Results:

    • Both profilometer and AFM indicated that some polishing kits achieved average roughness (Ra) comparable to glazed surfaces.
    • No correlation was found between profilometer and AFM measurements for maximum roughness height (Ry).
    • Profilometer showed no significant difference in Ry between polished and glazed surfaces, while AFM indicated polishing kits could not match glazed surface smoothness.

    Conclusions:

    • Certain intraoral polishing kits can achieve excellent surface smoothness (Ra) on dental ceramics, similar to glazing.
    • Discrepancies between profilometer and AFM for Ry highlight the need for advanced surface analysis in evaluating polishing efficacy.
    • The study underscores the importance of selecting appropriate polishing systems to achieve desired surface characteristics in ceramic restorations.