| Autor: |
SONG Ye, REN Yinting, ZHANG Yihan, HAN Jingying |
| Jazyk: |
čínština |
| Rok vydání: |
2024 |
| Předmět: |
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| Zdroj: |
Kouqiang yixue, Vol 44, Iss 5, Pp 334-337 (2024) |
| Druh dokumentu: |
article |
| ISSN: |
1003-9872 |
| DOI: |
10.13591/j.cnki.kqyx.2024.05.003 |
| Popis: |
Objective To investigate the effect of different premolar extraction patterns on Bolton index and occlusal relationship of skeletal Class Ⅱ malocclusion. Methods The plaster models of 62 patients with skeletal Class Ⅱ malocclusion were selected and converted into digital models by iTeroElement scanner. Each model was simulated by the four premolar extraction pattrens, and tooth arrangement test was performed after tooth extraction. The Bolton index before and after tooth extraction was calculated, and the occlusal relationship after tooth arrangement was evaluated to explore its law. Results All the four premolar extraction patterns resulted in a significant decrease in the Bolton index over-all ratio in skeletal Class Ⅱ patients, and compared with the extraction patterns of 4/4 and 4/5, the patterns of 5/4 and 5/5 resulted in a greater decrease in the Bolton index over-all ratio(P3 mm), and the difference was statistically significant(P |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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