Load System of Segmental T-Loops for Canine Retraction
文献类型：期刊论文
| 作者 | Xia Zeyang; Chen Jie; Jiangc Feifei; Li Shuning; Viecilli Rodrigo F.; Liu Sean Y. |
| 刊名 | AMERICAN JOURNAL OF ORTHODONTICS AND DENTOFACIAL ORTHOPEDICS
 |
| 出版日期 | 2013 |
| 英文摘要 | Objectives The orthodontic load system, especially the ideal moment-to-force ratios (M/F), is the commonly used design parameter of segmental T-loops for canine retraction. However, the load system, including M/F, may be affected by the changes in canine angulations and interbracket distance (IBD). Here, we hypothesize that clinical changes in canine position and angulation during canine retraction will significantly affect the load system delivered to the tooth. Methods The load systems of two T-loop groups, one for translation (TR) and the other for controlled tipping (CT), from nine bilateral canine retraction patients were made to the targeted values obtained from finite element analyses and validated. Each loop was tested on the corresponding maxillary dental cast obtained in the clinic. The casts were made before and after each treatment interval so that both initial and residual load systems could be obtained. The pre- and post-treatment IBDs were recorded for calculating IBD changes. Results As the IBDs decreased, the averaged retraction-force-drop per IBD reduction was 36 cN/mm, a 30% drop per 1 mm IBD decrease. The averaged anti-tipping-moment-drops per IBD reductions were 0.02 N-mm/mm for CT and 1.4 N-mm/mm for TR, ~0.6 % and 17% drop per 1 mm IBD decrease, respectively. Consequently, the average M/F increases per 1 mm IBD reduction were 1.24 mm/mm for CT and 6.34 mm/mm for TR. There was significant residual load left, which could continue to move the tooth if the patient missed the scheduled appointment. Conclusions Clinical changes in canine position and angulation during canine retraction significantly affect the load system. The initial planned M/F needs to be lower to reach the expected average ideal value. Patients should be required to follow the office visit schedule closely to avoid negative effects due to significant M/F increases with time. |
| 收录类别 | SCI |
| 原文出处 | http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3829684/?tool=pubmed |
| 语种 | 英语 |
| 源URL | [http://ir.siat.ac.cn:8080/handle/172644/4445]  |
| 专题 | 深圳先进技术研究院_集成所 |
| 作者单位 | AMERICAN JOURNAL OF ORTHODONTICS AND DENTOFACIAL ORTHOPEDICS |
| 推荐引用方式 GB/T 7714 | Xia Zeyang,Chen Jie,Jiangc Feifei,et al. Load System of Segmental T-Loops for Canine Retraction[J]. AMERICAN JOURNAL OF ORTHODONTICS AND DENTOFACIAL ORTHOPEDICS,2013. |
| APA | Xia Zeyang,Chen Jie,Jiangc Feifei,Li Shuning,Viecilli Rodrigo F.,&Liu Sean Y..(2013).Load System of Segmental T-Loops for Canine Retraction.AMERICAN JOURNAL OF ORTHODONTICS AND DENTOFACIAL ORTHOPEDICS. |
| MLA | Xia Zeyang,et al."Load System of Segmental T-Loops for Canine Retraction".AMERICAN JOURNAL OF ORTHODONTICS AND DENTOFACIAL ORTHOPEDICS (2013). |
入库方式： OAI收割
来源：深圳先进技术研究院
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