| Autor: |
Fei, Qin, Xiao-Qing, Ma, Pei-Cheng, Xu |
| Rok vydání: |
2017 |
| Předmět: |
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| Zdroj: |
Shanghai kou qiang yi xue = Shanghai journal of stomatology. 26(1) |
| ISSN: |
1006-7248 |
| Popis: |
To evaluate the effect of one-couple orthodontic NiTi auxiliary arch on the premolar extrusion which had subgingival decayed defect.A total of 30 cases with subgingival decayed defects over 2 mm under the proximal gingival margin were chosen including 18 first premolars and 12 second premolars. The first and second molars on the same side were connected steadily and the one-couple orthodontic force system was designed. The NiTi segmental arch was used to extrude the teeth. Student's t test was performed with SPSS 8.0 software package.All the defect margins were 1mm over the gingival margins and the extrusion distance was 2.6~4.1 mm. After extrusion, the crown-root ratio was 1.24±0.30, the depth of the gingival sulcus was 1.87±0.28 mm. There was no significant difference before and after treatment in the angle between the axis of the extruded teeth and that of the first molar (P0.05). The anchorage teeth kept almost the same relationship with the opposite.One-couple orthodontic NiTi auxiliary arch could extrude the premolars with subgingival decayed defects effectively and precisely. The designed force system had little effect on the anchorage teeth. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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