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The quasi-fixed point for the linearised deciduous dentition plot.

¹Tokyo Dental College.

The Bulletin of Tokyo Dental College

|February 1, 1990

Summary

This study evaluates Masuyama's methods for predicting tooth eruption timing using a quasi-fixed point. The indirect method showed limitations with general data but improved with selected, linearized dentition data, aiding dental age estimation.

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Area of Science:

Odontology
Human Growth and Development
Biostatistics

Background:

Masuyama's quasi-fixed point on linearized dentition plots aids in predicting subsequent tooth eruption ages.
Two methods exist: direct (individual longitudinal data) and indirect (mean/standard deviation of eruption ages).

Purpose of the Study:

To validate Masuyama's direct and indirect methods for determining the quasi-fixed point.
To assess the reliability of the indirect method using published dentition data.

Main Methods:

Comparison of direct and indirect methods using Kitamura's individual eruption age data.
Application of the indirect method to estimate the quasi-fixed point from published studies.
Analysis of data, including exclusion of deciduous central incisors, to refine estimates.

Main Results:

The indirect method yielded invalid estimates with general data, differing from the direct method.
Estimates converged when using the indirect method on a selected group with linearized dentition.
Estimates of the quasi-fixed point (C) varied across studies but generally fell in late dentition stages.
Excluding deciduous central incisors narrowed the range of C to approximately 1.3-1.5.

Conclusions:

The indirect method's accuracy is highly dependent on data selection and dentition linearity.
The quasi-fixed point is consistently found in later stages of dental development.
Excluding specific early teeth refines the estimation of the quasi-fixed point for improved dental age prediction.

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