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Assessing Enamel Thickness to Estimate Interproximal Reduction: A CBCT-Based Study.

Enrique González-García1, Nasib Balut-Chahin2,3, Claudia Daniela Rojo-Arce4

  • 1Department of Orthodontics, Technological University of Mexico, Mexico City, Mexico.

Clinical and Experimental Dental Research
|February 18, 2025
PubMed
Summary

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This summary is machine-generated.

This study highlights the importance of measuring proximal enamel thickness available (PETa) and remaining (PETr) before interproximal reduction (IPR). Exceeding 0.20 mm of IPR increases risks, especially for teeth with thinner enamel.

Area of Science:

  • Orthodontics
  • Dental Imaging
  • Enamel Morphology

Background:

  • Interproximal reduction (IPR) is a common orthodontic procedure.
  • Accurate measurement of enamel thickness is crucial for safe IPR.
  • Cone-beam computed tomography (CBCT) offers detailed 3D imaging for dental analysis.

Purpose of the Study:

  • To estimate mesial and distal proximal enamel thickness available (PETa).
  • To estimate proximal enamel thickness remaining (PETr) after planned IPR.
  • To assess risks associated with varying IPR amounts on PETr.

Main Methods:

  • A cross-sectional study analyzed 1615 teeth using CBCT scans.
  • On-demand software estimated PETa at the middle third of the crown.
  • Mesial and distal PETa and PETr were measured and compared.
Keywords:
CBCTIPRPETaPETrenamel availabilityenamel thicknessinterproximal reductionproximal enamel thickening

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Main Results:

  • Mean PETa ranged from 0.96 to 1.29 mm (mesial) and 0.98 to 1.25 mm (distal).
  • Statistically significant differences in mesial vs. distal PETa were observed (average 0.10 mm).
  • IPR exceeding 0.20 mm significantly increased risks, particularly for teeth with enamel < 0.7 mm.

Conclusions:

  • PETa and PETr are vital for safe, individualized IPR.
  • CBCT-based PETa evaluation is recommended for IPR > 0.20 mm.
  • This approach enhances precision and minimizes risks of excessive enamel reduction.