左側下顎第二小臼齒先天缺牙的矯正治療－口罩牽引臼齒前移－病例報告

Orthodontic Treatment of Congenital Missing Tooth of Left Mandibular Second Premolar- Molar Protraction by a Design Mask: A Case Report

黃爾珣(Er-Hsun Huang) ； 李忠興(Chung-Hsing Li) ； 李威成(Wei-Cheng Lee) ； 蕭名智(Ming-Jhih Siao)

《北市醫學雜誌》 20卷3期 (2023/09) Pp. 369-376

https://doi.org/10.6200/TCMJ.202309_20(3).0009

摘要

先天性缺牙是常見的牙齒萌發異常，可導致病人不良的外觀與發音，進而影響生活品質；以矯正方式關閉缺牙空間，可提供較易於清潔的環境並保護牙周組織。然而，對於空間過大需要前移臼齒的病人一向是矯正治療中較困難的術式，特別是下顎因皮質骨較厚更加難以移動。本案例為一名20歲女性，因左下第二小臼齒先天缺牙造成乳牙殘留。矯正治療中，口罩牽引輔助達成臼齒前移並關閉缺牙空間，於治療40個月後得到良好的功能與外觀之成果。口罩牽引可減少前牙錨定區之副作用並提供有效的牽引效果，可做為新的輔助治療選項。

關鍵字

臼齒前移 ； 先天性缺牙 ； 口外牽引

並列摘要

Congenitally missing teeth is a common dental anomaly that may result in unfavorable appearance and inarticulate pronunciation and, in turn, affects life quality. Closing edentulous space by orthodontic treatment provides an environment that is easy to clean and protects the periodontal tissues. However, protracting molar for excess space is challenging in orthodontic treatments, especially since the lower jaw is unwieldy due to the thick cortical bone. This case report presented a 20-year-old female with congenitally missing teeth of the left mandibular second premolar, which resulted in a retained primary tooth. In this treatment, mask traction assisted in moving the molars forward and closing the edentulous space. Good occlusion and appearance were obtained after 40 months of treatment. This case provides a new approach by using soft tissues as the anchor for mandibular molar protraction, causing fewer side effects compared with front teeth anchorage and thus resulting in an effective protraction.

並列關鍵字

molar protraction ； congenital missing tooth ； extra-oral protraction

參考文獻

Davis PJ. Hypodontia and hyperdontia of permanent teeth in Hong Kong schoolchildren. Community Dent Oral Epidemiol 1987; 15(4): 218-20.

Katranji A, Misch K, Wang HL. Cortical bone thickness in dentate and edentulous human cadavers. J Periodontol 2007; 78(5): 874-8.

Yijin R, Jaap CM, Lets S, Robert SB, Anne MK. Age-related changes of periodontal ligament surface areas during force application. Angle Orthod 2008; 78(6): 1000-5.

Flavio U, Nandakumar J, Amine NF, Gian PS, Ravindra N. Corticotomy-assisted molar protraction with the aid of temporary anchorage device. Angle Orthod 2013; 83(6): 1083-1092.

Nihara J, Gielo-Perczak K, Cardinal L, Saito I, Nanda R, Uribe F. Finite element analysis of mandibular molar protraction mechanics using miniscrews. Eur J Orthod 2015; 37(1): 95-100.