INITIAL STRESS-INDUCED IN PERIODONTAL TISSUE WITH DIVERSE DEGREES OF BONE LOSS BY AN ORTHODONTIC FORCE - TRIDIMENSIONAL ANALYSIS BY MEANS OF THE FINITE-ELEMENT METHOD
J. Cobo et al., INITIAL STRESS-INDUCED IN PERIODONTAL TISSUE WITH DIVERSE DEGREES OF BONE LOSS BY AN ORTHODONTIC FORCE - TRIDIMENSIONAL ANALYSIS BY MEANS OF THE FINITE-ELEMENT METHOD, American journal of orthodontics and dentofacial orthopedics, 104(5), 1993, pp. 448-454
This study was undertaken to determine the stress that appears in toot
h, periodontal ligament and alveolar bone, when a labiolingual force o
f 100 gm is applied in a labiolingual direction in a midpoint of the c
rown of an inferior digitalized canine, and its changes depending on t
he degree of loss of the supporting bone. The analysis of tensions was
carried out by means of the finite element method (FEM) for a normal
case and after reducing the periodontal support bone 2, 4, 6, and 8 mm
. Three-dimensional images in false color in which intensity of tensio
ns and its areas of extension are generated. Special attention was pai
d to changes at level D (apical transversal section) to which maximum,
mean, minimum, and Von Mises tensions are calculated. After applying
the labiolingual force in the canine, a progressive increase of the st
ress in the labial and lingual zones of the tooth, periodontal membran
e and alveolar bone was observed when the alveolar bone was reducing.
In the mesial and distal zones, no compensating forces appear, which c
ould provoke a tooth rotation during the tipping movements.