J Korean Assoc Oral Maxillofac Surg 2019; 45(5): 254~259
Surgical extrusion of a maxillary premolar after orthodontic extrusion: a retrospective study
Yong-Hoon Choi1, Hyo-Jung Lee2
Departments of 1Conservative Dentistry and 2Periodontology, Section of Dentistry, Seoul National University Bundang Hospital, Seongnam, Korea
Hyo-Jung Lee
Department of Periodontology, Section of Dentistry, Seoul National University Bundang Hospital, 82 Gumi-ro 173beon-gil, Bundang-gu, Seongnam 13620, Korea
TEL: +82-31-787-7547 FAX: +82-31-787-4068
E-mail: 65592@snubh.org
ORCID: https://orcid.org/0000-0002-0439-7389
Received January 8, 2019; Revised March 15, 2019; Accepted March 18, 2019.; Published online October 31, 2019.
© The Korean Association of Oral and Maxillofacial Surgeons.. All rights reserved.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Objectives: Crown-root fracture and cervical caries in maxillary premolars constitute a challenge in cases of subgingival placement of restoration margins. Surgical extrusion has been practiced successfully in permanent anterior teeth. The aim of the present retrospective study was to assess the clinical outcome of surgical extrusion after orthodontic extrusion in maxillary premolars.
Materials and Methods: Twenty-one single, tapered root maxillary premolars with subgingival crown-root fracture or caries were included. Presurgical orthodontic extrusion was performed on all teeth to prevent root resorption. Extent of extrusion and rotation was determined based on crown/root ratio. The postoperative splinting period was 7 to 14 days. Clinical and radiographic examination was performed at an interval of 1, 2, and 3 months.
Results: After the mean follow-up of 41.9±15.2 months, failure was observed as increased mobility in 3 of 21 cases. No significant difference was observed in the outcome of surgical extrusion based on tooth type, age, sex, 180° rotation, or time for extraction. Furthermore, marginal bone loss was not observed.
Conclusion: Surgical extrusion of maxillary premolars can be a possible therapeutic option in cases of subgingival crown-root fracture.
Keywords: Surgical extrusion, Maxillary premolar, Surgical crown lengthening

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31 December 2019
Vol. 45
No. 6 pp. 301~378

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