|
KMID : 0376319990110010217
|
|
Dental Journal of CNU
1999 Volume.11 No. 1 p.217 ~ p.229
|
|
|
Mode of tooth movement according to the timing of orthodontic force application after extraction
|
|
|
|
|
Abstract
|
|
|
This study was performed to compare and analyze the mode of tooth movement according to the timing of orthodontic force application after extraction.
The upper right and left third incisors were carefully extracted at three-week interval in four adult dogs. Both canines were used as an anchorage for the bodily movement of the upper second incisors. Orthodontic force of 100 gin was simultaneously applied at one week after extraction on one side and four weeks after extraction on the other side using NiTi closed coil spring. While orthodontic force was applied for twelve: weeks, the amount of tooth movement was measured at every second week with digital calipers. The animals were sacrificed at twelve weeks and histologic examination was executed to reveal any difference between both sides.
The results were obtained as follows;
1. The tooth movement was faster in four-week side than one week side for the first two weeks while faster in one-week side during next two weeks
2. The rate of tooth movement was fastest during four to six weeks period, then decreased gradually.
3. The total amount of tooth movement tended to be larger in one-week side compared to four-week side.
4. Any damage to tooth and periodontal tissue could not be seen in the histologic section of one-week side.
These results suggest that earlier application of orthodontic force is better than later after ex-traction in terms of the rate of tooth movement.
|
|
|
KEYWORD
|
|
|
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|
|