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International Research Journal of Public and Environmental Health
Vol.5 (6),pp. 90-103, September 2018
ISSN 2360-8803
Available online at
Author(s) retain the copyright of this article. Author(s) agree that this article remain permanently open access under the terms of the Creative Commons Attribution License 4.0 International License.

Original Research Article

ISW for the treatment of moderate crowding dentition with unilateral second molar impaction

Chun-Shuo Huang1,2 , Chien-Chih Yu3*, and Jian-Hong Yu1

1Department of Orthodontics, China Medical University Hospital, Taichung, Taiwan
2School of Dentistry, College of Dentistry, China Medical University, Taichung, Taiwan
3School of Pharmacy, China Medical University, Taichung, Taiwan

*Corresponding Author Email: kenkoyu(at)

date Received: July 6, 2018     date Accepted: August 31, 2018     date Published: September 15, 2018


The objective of the treatment is for an adult with moderate crowding dentition and unilateral second molar impaction by ISW (Improved Super-elastic Ti-Ni alloy Wire, developed by Tokyo Medical and Dental University) will be discussed. An adult male (21y11m) came to our clinic with a chief complaint of maxillary protrusion, irregular dentition and midline deviation. Clinical examination revealed a moderate crowding with #25, #35 linguoversion and #37 impaction. With ISW leveling, crimpable stopper and open coil spring, we uprighted the lower left second molar. After that, toe-in and lingual torque was added to adjust #37 position. The protruded profile was improved by canine distal drive and anterior retraction. Treatment was completed within 33 months and a desirable occlusion with adequate overbite and overjet was achieved.

Key words: ISW, bimaxillary protrusion, skeletal Class II, linguoversion, molar uprighting, distalization, crown lingual torque, toe-in bend, intermaxillary elastic.

Huang et al