| Autor: |
Jun, Ji, Xiao-ping, Luo, Wei, Lu, Tie-mei, Wang, Lie, Wu, Cheng-jun, Shu |
| Rok vydání: |
2008 |
| Předmět: |
|
| Zdroj: |
Zhonghua kou qiang yi xue za zhi = Zhonghua kouqiang yixue zazhi = Chinese journal of stomatology. 42(10) |
| ISSN: |
1002-0098 |
| Popis: |
To evaluate the bone density changes in the apical area of subgingivally fractured tooth after rapid orthodontic extrusion.Twelve 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.The 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 (P0.01).Under 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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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