Bone density changes in the apical area after rapid orthodontic extrusion of subgingivally fractured tooth.
- Author:
Jun JI
1
;
Xiao-ping LUO
;
Wei LU
;
Tie-mei WANG
;
Lie WU
;
Cheng-jun SHU
Author Information
- Publication Type:Journal Article
- MeSH: Adult; Bone Density; physiology; Female; Humans; Incisor; immunology; Male; Orthodontic Extrusion; methods; Orthodontic Wires; Tooth Fractures; physiopathology; therapy; Tooth Root; injuries; Tooth Socket; physiopathology
- From: Chinese Journal of Stomatology 2007;42(10):601-604
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVETo evaluate the bone density changes in the apical area of subgingivally fractured tooth after rapid orthodontic extrusion.
METHODSTwelve fractured incisors in 11 patients extended 2 - 5 mm below the gingival line were selected. Two weeks after root canal therapy, the subgingival fragment was lifted up and the fracture line was brought 1.5 - 2.0 mm above the level of the gingival line by means of edgewise fixed appliance. After the extrusion completed, the tooth had been stabilized and held for 6 months. The CT Analyser software was used to measure the bone density changes in the apical area on radiographs once a month. Changes of relative value in bone density was quantitatively analyzed.
RESULTSThe average period of extrusion was 11 days. The relative value of bone density in the apical region was -39.6% immediately after extrusion and continuously increased afterwards. In the third month, the value (18.5%) changed most rapidly (P < 0.01).
CONCLUSIONSUnder the continuous and proper tooth axial extrusion force, the tooth moved rapidly and steadily. The bone density in the apical area approached normal value within 3 months after treatment.
