Physical properties of root cementum: Part 17. Root resorption after the application of 2.5° and 15° of buccal root torque for 4 weeks: A microcomputed tomography study

Bartley, N; Türk, T; Colak, C; Elekdaǧ-Türk, S; Jones, A; Petocz, P; Darendeliler, MA

Physical properties of root cementum: Part 17. Root resorption after the application of 2.5° and 15° of buccal root torque for 4 weeks: A microcomputed tomography study

Bartley, N Türk, T Colak, C Elekdaǧ-Türk, S Jones, A

Petocz, P Darendeliler, MA

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Publication Type:: Journal Article
Citation:: American Journal of Orthodontics and Dentofacial Orthopedics, 2011, 139 (4)
Issue Date:: 2011-04-01

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Field	Value	Language
dc.contributor.author	Bartley, N	en_US
dc.contributor.author	Türk, T	en_US
dc.contributor.author	Colak, C	en_US
dc.contributor.author	Elekdaǧ-Türk, S	en_US
dc.contributor.author	Jones, A https://orcid.org/0000-0002-3522-6371	en_US
dc.contributor.author	Petocz, P	en_US
dc.contributor.author	Darendeliler, MA	en_US
dc.date.available	2010-01-01	en_US
dc.date.issued	2011-04-01	en_US
dc.identifier.citation	American Journal of Orthodontics and Dentofacial Orthopedics, 2011, 139 (4)	en_US
dc.identifier.issn	0889-5406	en_US
dc.identifier.uri	http://hdl.handle.net/10453/118084
dc.description.abstract	Introduction: Root resorption is an undesirable consequence of orthodontic tooth movement. The severity is unpredictable, and, despite extensive research, the etiology remains unknown. Torque has been acknowledged as a risk factor for root resorption. The aims of the study were to evaluate and quantify the extent of root resorption after the application of 2.5° and 15° of buccal root torque for 4 weeks. Methods: Fifteen patients requiring bilateral extraction of their maxillary first premolars for orthodontic treatment were recruited to the study. By using a standardized experimental protocol, the right and left premolars were randomly subjected to either 2.5° or 15° of buccal root torque. At the end of the 4-week experimental period, the premolars were extracted. A volumetric analysis of root resorption was performed by using microcomputed tomography and measured with specially designed software. Results: Overall, the amounts of root resorption were comparable after the application of 2.5° or 15° of buccal root torque (P = 0.59). There was a significant difference between the 2 force levels only at the apical region (P = 0.034). More root resorption occurred in areas of compression than in areas of tension. The variables of age and sex were not statistically significant. Conclusions: Root resorption was evident after 4 weeks of buccal root torque application. More root resorption was seen at the apical region than at the middle and cervical regions. Higher magnitudes of torque might cause more root resorption, particularly in the apical region. As shown in previous studies, the etiology of root resorption is multi-factorial and cannot be explained by mechanical factors alone. Copyright © 2011 by the American Association of Orthodontists.	en_US
dc.relation.ispartof	American Journal of Orthodontics and Dentofacial Orthopedics	en_US
dc.relation.isbasedon	10.1016/j.ajodo.2010.01.033	en_US
dc.subject.classification	Dentistry	en_US
dc.subject.mesh	Maxilla	en_US
dc.subject.mesh	Dental Cementum	en_US
dc.subject.mesh	Bicuspid	en_US
dc.subject.mesh	Tooth Root	en_US
dc.subject.mesh	Tooth Apex	en_US
dc.subject.mesh	Humans	en_US
dc.subject.mesh	Root Resorption	en_US
dc.subject.mesh	Imaging, Three-Dimensional	en_US
dc.subject.mesh	Risk Factors	en_US
dc.subject.mesh	Orthodontic Brackets	en_US
dc.subject.mesh	Orthodontic Wires	en_US
dc.subject.mesh	Tooth Movement	en_US
dc.subject.mesh	Age Factors	en_US
dc.subject.mesh	Sex Factors	en_US
dc.subject.mesh	Biomechanics	en_US
dc.subject.mesh	Stress, Mechanical	en_US
dc.subject.mesh	Torque	en_US
dc.subject.mesh	Time Factors	en_US
dc.subject.mesh	Image Processing, Computer-Assisted	en_US
dc.subject.mesh	Adolescent	en_US
dc.subject.mesh	Child	en_US
dc.subject.mesh	Female	en_US
dc.subject.mesh	Male	en_US
dc.subject.mesh	X-Ray Microtomography	en_US
dc.subject.mesh	Biomechanical Phenomena	en_US
dc.subject.mesh	Tooth Movement Techniques	en_US
dc.title	Physical properties of root cementum: Part 17. Root resorption after the application of 2.5° and 15° of buccal root torque for 4 weeks: A microcomputed tomography study	en_US
dc.type	Journal Article
utslib.citation.volume	4	en_US
utslib.citation.volume	139	en_US
utslib.for	0903 Biomedical Engineering	en_US
utslib.for	1105 Dentistry	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Life Sciences
utslib.copyright.status	closed_access
pubs.issue	4	en_US
pubs.publication-status	Published	en_US
pubs.volume	139	en_US

Abstract:

Introduction: Root resorption is an undesirable consequence of orthodontic tooth movement. The severity is unpredictable, and, despite extensive research, the etiology remains unknown. Torque has been acknowledged as a risk factor for root resorption. The aims of the study were to evaluate and quantify the extent of root resorption after the application of 2.5° and 15° of buccal root torque for 4 weeks. Methods: Fifteen patients requiring bilateral extraction of their maxillary first premolars for orthodontic treatment were recruited to the study. By using a standardized experimental protocol, the right and left premolars were randomly subjected to either 2.5° or 15° of buccal root torque. At the end of the 4-week experimental period, the premolars were extracted. A volumetric analysis of root resorption was performed by using microcomputed tomography and measured with specially designed software. Results: Overall, the amounts of root resorption were comparable after the application of 2.5° or 15° of buccal root torque (P = 0.59). There was a significant difference between the 2 force levels only at the apical region (P = 0.034). More root resorption occurred in areas of compression than in areas of tension. The variables of age and sex were not statistically significant. Conclusions: Root resorption was evident after 4 weeks of buccal root torque application. More root resorption was seen at the apical region than at the middle and cervical regions. Higher magnitudes of torque might cause more root resorption, particularly in the apical region. As shown in previous studies, the etiology of root resorption is multi-factorial and cannot be explained by mechanical factors alone. Copyright © 2011 by the American Association of Orthodontists.

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http://hdl.handle.net/10453/118084