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Improved facial profile with non-extraction treatment of severe protrusion using TSADs

  • Jae Hyun Park
    Affiliations
    Postgraduate Orthodontic Program, Arizona School of Dentistry & Oral Health, A.T. Still University, Mesa, AZ and International Scholar, Graduate School of Dentistry, Kyung Hee University, Seoul, South Korea
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  • Yoon-Ah Kook
    Affiliations
    Department of Orthodontics, Seoul St. Mary's Hospital, College of Medicine, Catholic University of Korea, Seoul, South Korea
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  • Yoonji Kim
    Affiliations
    Department of Orthodontics, Seoul St. Mary's Hospital, College of Medicine, Catholic University of Korea, Seoul, South Korea
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  • Lyun Kwang Ham
    Affiliations
    Department of Orthodontics, Seoul St. Mary's Hospital, College of Medicine, Catholic University of Korea, Seoul, South Korea
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  • Nam-Ki Lee
    Correspondence
    Corresponding author at: Department of Orthodontics, Section of Dentistry, Seoul National University Bundang Hospital, 82, Gumi-ro 173Beon-gil, Bundang-gu, Seongnam, Gyeonggi Province, South Korea.
    Affiliations
    Department of Orthodontics, Section of Dentistry, Seoul National University Bundang Hospital, Seongnam, Gyeonggi Province, South Korea
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Published:October 27, 2022DOI:https://doi.org/10.1053/j.sodo.2022.10.015

      Abstract

      Extraction has traditionally been necessary to correct bimaxillary and lip protrusion with proclined maxillary and mandibular incisors. However, non-extraction treatment using temporary skeletal anchorage devices (TSADs) is now an option for severe overjet or full-step Class II malocclusions. It is possible to treat bimaxillary protrusion with non-extraction, but for successful non-extraction treatment in bimaxillary patients, the amount of total arch distalization of the mandibular dentition is crucial.
      For maximum total mandibular arch distalization in protrusion patients, it is recommended to extrude and distalize the molars simultaneously, which results in more posterior movement of the mandibular dentition without gingival impingement. Therefore, this paper presents efficient biomechanics, a strategy, and the anatomy of the retromolar area for total arch distalization using TSADs to improve facial profile without extracting premolars in Class II maxillary and bimaxillary protrusion patients.
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