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Related Experiment Videos

Enamel surface roughness following debonding using two resin grinding methods.

Theodore Eliades1, Christiana Gioka, George Eliades

  • 1Biomaterials Laboratory, Section of Basic Sciences and Oral Biology, School of Dentistry, University of Athens, Greece.

European Journal of Orthodontics
|June 30, 2004
PubMed
Summary

Debonding orthodontic brackets can irreversibly increase enamel roughness. While diamond burs removed resin faster than carbide burs, neither method nor Soflex disc finishing consistently restored enamel texture.

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Surface Science

Background:

  • Orthodontic bracket debonding necessitates resin removal, a critical step that can impact enamel surface integrity.
  • Understanding the quantitative effects of different resin removal techniques on enamel roughness is essential for minimizing iatrogenic damage.

Purpose of the Study:

  • To quantitatively assess enamel surface roughness after debonding using two distinct resin removal methods: an eight-bladed carbide bur and an ultra-fine diamond bur.
  • To evaluate the effectiveness of Soflex discs in reducing enamel roughness post-resin removal.
  • To compare the time efficiency of the two resin removal techniques.

Main Methods:

  • Thirty premolar crowns had enamel surfaces analyzed for roughness (Ra, Rq, Rt, Rz) using profilometry before and after resin removal.

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  • Resin removal was performed with either an eight-bladed carbide bur or an ultra-fine diamond bur at high speed.
  • Finishing was standardized with Soflex discs, with a final roughness measurement taken.

    • Main Results:

    • Significant differences in enamel roughness parameters were observed between the carbide bur and diamond bur methods (P < 0.05).
    • Finishing with Soflex discs did not consistently reduce enamel roughness.
    • Resin removal with the diamond bur was approximately twice as fast as with the carbide bur.

    Conclusions:

    • The debonding procedure and subsequent resin removal protocols, regardless of the method used, induced an increase in enamel roughness that was not fully reversed by finishing.
    • Diamond burs offer a time-efficient alternative for resin removal compared to carbide burs.
    • Enamel surface texture changes post-debonding appear to be largely irreversible with current clinical methods.