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Direct light transmittance through ceramic brackets

T Eliades1, W M Johnston, G Eliades

  • 1Section of Orthodontics, College of Dentistry, Ohio State University, Columbus.

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|January 1, 1995
PubMed
Summary

Monocrystal esthetic brackets show significantly higher light transmittance than other types. Bracket material and structure impact light transmission, crucial for dental polymerization.

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Area of Science:

  • Biomaterials Science
  • Orthodontics
  • Materials Science

Background:

  • Esthetic brackets are increasingly used in orthodontics.
  • Adequate light transmittance is essential for the proper curing of light-cured dental materials used with these brackets.

Purpose of the Study:

  • To quantify the direct light transmittance (%T) of various esthetic bracket types.
  • To correlate light transmittance with bracket structure, morphology, and composition.

Main Methods:

  • Ultraviolet-visible (UV-Vis) spectroscopy was used to measure direct light transmittance (%T) at 320–700 nm.
  • Measurements were taken at 468 nm, the peak absorbance wavelength for common photoinitiators.
  • Scanning electron microscopy (SEM) analyzed bracket structure and morphology.

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  • Statistical analysis included one-way ANOVA and Scheffé's test (α = 0.05).

    • Main Results:

    • Monocrystal brackets (Starfire) exhibited the highest %T (35.02 ± 1.59%).
    • Polycrystalline (Fascination) and ceramic/polycarbonate base (Ceramaflex) brackets showed significantly lower %T (5.70 ± 1.41% and 4.02 ± 0.96%, respectively).
    • Other tested brands demonstrated %T values ranging from 1.22% to 3.62%.
    • SEM revealed significant differences in structure, morphology, and composition among the bracket types.

    Conclusions:

    • Bracket structure, morphology, and composition significantly influence direct light transmittance.
    • Monocrystal brackets offer superior light transmittance compared to other esthetic bracket types.
    • Material selection is critical for ensuring effective light curing in orthodontic applications.