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Comparison study between three tooth positioners.

W A Mischler, H P Delivanis

American Journal of Orthodontics

|February 1, 1984

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Orthodontic positioners generally maintain arch dimensions, but significant changes in mandibular intercanine and maxillary intermolar width were noted with prefinisher models. Careful checking of positioners before patient delivery is recommended for optimal orthodontic stability.

Area of Science:

Orthodontics
Dental Materials Science

Background:

Maintaining orthodontic arch dimensions is crucial for treatment stability.
Tooth positioners are used for retention, but their impact on arch stability requires evaluation.

Purpose of the Study:

To compare ten essential dental arch measurements between post-treatment models and three types of tooth positioners.
To assess the dimensional accuracy of custom-made and prefabricated orthodontic positioners.

Main Methods:

Evaluated two custom-made and one prefabricated positioner using dental models from twelve Class I occlusion patients.
Compared original control models with models from custom positioners and prefinisher positioners.
Recorded changes in intercanine/intermolar width, arch length, molar classification, rotations, overjet, overbite, and arch symmetry.

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Main Results:

Significant differences observed in mandibular intercanine and maxillary intermolar width between control and prefinisher models.
No significant differences found in arch length or maxillary intercanine/mandibular intermolar width compared to control models.
Most cases maintained Class I molar relationships, with minor deviations in other parameters; arch symmetry was generally acceptable.

Conclusions:

Orthodontic positioners largely preserve individual arch dimensions.
Prefinisher models showed significant dimensional changes, highlighting the need for careful verification.
Thorough checking of positioners before patient use is essential for ensuring orthodontic treatment stability.