Korean J Orthod.
2000 Jun;30(3):273-285.
An experimental study on the dynamic tooth movement of two molar uprighting spring by calorific machine
- Affiliations
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- 1Division of Orthodontics, Department of Dentistry, college of Medicine, Ewha Womans University, Korea.
Abstract
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The aim of this investigation was to evaluate the differences of two canti-lever
springs by using a new simulation system. This was done using a Calorific machine
that compared crown uprighting spring and root uprighting spring. The Calorific
machine was designed to allow observation of the whole process of tooth moving, and it
composed of three parts(a temperature regulation system, electro-thermodynamic teeth,
and an artificial alveolar bone component).
The obtained results wee as follows.
1. Distal and buccal movement of the anchor teeth were observed greater in the root
uprighting spring than the crown uprighting spring.
2. Crown uprighting spring showed distal movement of the crown of lower second molar
for 3.29mm but root uprighting spring showed only 1.68mm.
3. Crown uprighting spring exhibited forward movement of mesial and distal root of the
lower second molar for 3.91mm, 3.60mm but the root uprighting spring showed 6.76mm, 6.26
mm.