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Lower incisor inclination regarding different reference planes.

Brenda Zataráin1, Josué Avila1, Angeles Moyaho2

  • 1Department of Orthodontics, School of Dentistry, Meritorious Autonomous University of Puebla, Mexico.

Acta Odontologica Latinoamericana : AOL
|October 13, 2016
PubMed
Summary

This study found the true vertical plane (TVP) is reliable for measuring lower incisor inclination, correlating well with other cephalometric analysis methods. Compensated incisor-mandibular plane angle (IMPACOM) and Frankfort mandibular incisor angle (FMIA) closely align with the TVP.

Keywords:
IncisorOrthodonticsreference standards

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Area of Science:

  • Dentistry
  • Orthodontics
  • Cephalometric Analysis

Background:

  • Accurate assessment of lower incisor inclination is crucial in orthodontics.
  • Traditional reference planes may be influenced by variations in mandibular growth.
  • The reliability of the true vertical plane (TVP) for incisor inclination measurement requires further validation.

Purpose of the Study:

  • To evaluate the accuracy of the true vertical plane (TVP) in measuring lower incisor inclination.
  • To compare incisor inclination measurements using TVP against established cephalometric reference planes.
  • To assess the correlation between TVP and other angular measurements, including compensated incisor-mandibular plane angle (IMPACOM).

Main Methods:

  • An observational, longitudinal, prospective study involving 100 lateral cephalograms.
  • Cephalograms were corrected to the natural head position to establish the true vertical plane (TVP).
  • Statistical analysis included T-tests, ANOVA, and Pearson correlation, with significance set at p < 0.05.

Main Results:

  • The true vertical plane (TVP) showed strong correlations with NB line (0.8614), Frankfort mandibular incisor angle (FMIA) (0.8894), and compensated IMPA (IMPACOM) (0.8895).
  • ANOVA revealed statistically significant differences among the means of the 7 variables (P=0.0001).
  • The compensated IMPA (IMPACOM) and FMIA did not significantly differ from the TVP, indicating their close agreement.

Conclusions:

  • The true vertical plane (TVP) is a reliable and adequate reference plane for measuring lower incisor inclination.
  • The compensated IMPA (IMPACOM) and FMIA demonstrate strong concordance with the TVP.
  • Cephalometric analysis using TVP provides a stable reference, minimizing variations due to mandibular growth patterns.