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Maturation of untreated normal occlusions.

P M Sinclair, R M Little

American Journal of Orthodontics

|February 1, 1983

Summary

Dental maturation involves changes like reduced arch length and increased incisor irregularity, with females exhibiting more significant developmental shifts than males in normal occlusions.

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Area of Science:

Dentistry
Orthodontics
Human Growth and Development

Background:

Understanding normal dentition development is crucial for diagnosing and treating malocclusions.
Longitudinal studies tracking untreated dental maturation provide a baseline for evaluating orthodontic interventions.

Purpose of the Study:

To analyze the developmental maturation of untreated normal dentition.
To quantify changes in specific dental parameters from mixed dentition to early adulthood.

Main Methods:

Evaluation of dental casts from 65 individuals with untreated normal occlusions.
Measurement of six dental parameters across three age groups: mixed dentition (9-10 yrs), early permanent dentition (12-13 yrs), and early adulthood (19-20 yrs).

Main Results:

Arch length and intercanine width decreased significantly.
Intermolar width, overjet, and overbite showed minimal changes.
Incisor irregularity increased, with females displaying more pronounced changes than males.
Individual parameter changes were not correlated; no clinically significant predictors were identified.

Conclusions:

Normal dentition undergoes subtle developmental maturation changes into early adulthood.
These changes are less extensive than those observed in treated orthodontic cases.
Findings highlight the natural trajectory of dental development in the absence of intervention.

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