Biological reaction of alveolar bone to orthodontic tooth movement

Authors
Citation
B. Melsen, Biological reaction of alveolar bone to orthodontic tooth movement, ANGL ORTHOD, 69(2), 1999, pp. 151-158
Citations number
40
Categorie Soggetti
Dentistry/Oral Surgery & Medicine
Journal title
ANGLE ORTHODONTIST
ISSN journal
00033219 → ACNP
Volume
69
Issue
2
Year of publication
1999
Pages
151 - 158
Database
ISI
SICI code
0003-3219(199904)69:2<151:BROABT>2.0.ZU;2-0
Abstract
Direct and indirect resorption are perceived as reactions to an applied for ce. This is in contrast to the view of orthopedic surgeons, who describe ap position as a reaction to loading of bone. A histomorphometric study of the circumalveolar bone reaction to a force system generating translation of p remolars and molars of five maccaca fascicularis monkeys is described. Thre e force levels (100 cN, 200 cN, and 300 cN) were applied for a period of 11 weeks. Undecalcified serial sections were cut parallel to the occlusal pla ne, and a grid consisting of three concentric outlines of the root intersec ted by six radii was placed on each section. Areas anticipated to be submit ted to different stress / strain distributions were isolated. A-posteriori tests were used in order to separate areas that differed with regard to par ameters reflecting bone turnover. Based on these results, a new hypothesis regarding tissue reaction to orthodontic forces is suggested. Direct resorp tion could be perceived as a result of the lowering of the normal strain fr om the functioning PDL and as such, as a start of remodeling, in the bone b iological sense of the word. Indirect remodeling could be perceived as a st erile inflammation attempting to remove ischemic bone under the hyalinized tissue. At a distance from the alveolus, dense woven bone was observed as a sign of a RAP (regional acceleratory phenomena). The apposition could, acc ording to the new hypothesis, be perceived as a result of the bending of th e alveolar wall produced by the pull from the Sharpey fibers. The above sug gested interpretation of tissue reaction would be shared with bone biologis ts.