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Computer analyses of two active plate modifications.

M Slaj1, M Perković, S R Mestrović

  • 1Department of Orthodontics, School of Dental Medicine, University of Zagreb, Croatia.

Collegium Antropologicum
|July 14, 1999
PubMed
Summary
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This study analyzed tooth movements in the upper dental arch using modified active plates. Symmetrical cuts resulted in even expansion, while asymmetrical cuts led to uneven tooth movement, highlighting the importance of anchorage in orthodontic therapy.

Area of Science:

  • Orthodontics
  • Dental Mechanics

Background:

  • Understanding tooth movement is crucial for effective orthodontic treatment.
  • Active plates are commonly used appliances for dental arch expansion.

Purpose of the Study:

  • To determine tooth movements in the upper dental arch with two active plate modifications: symmetrically and asymmetrically cut plates.
  • To analyze changes in dental arch dimensions and the distribution of forces generated by these appliances.

Main Methods:

  • Simulated original dental models were used.
  • Tooth movements were recorded by notching two reference points on each tooth, defining 38 variables.
  • The effects of symmetrically and asymmetrically cut active plates on transversal expansion were evaluated.

Main Results:

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  • Symmetrically cut plates caused equal transversal expansion and symmetrical premolar movement, with lesser effects on molars and canines, and no effect on incisors.
  • Asymmetrically cut plates resulted in greater expansion on the side with the smaller active plate segment.
  • Tooth movements were most significant in premolars, followed by molars and canines, with minimal incisor movement.

Conclusions:

  • The study confirms the logical interdependence between applied force and resulting tooth movement in orthodontic therapy.
  • Anchorage plays a critical role in achieving predictable outcomes with active plates.
  • The findings provide insights into optimizing active plate design for controlled dental arch expansion.