Physical properties of root cementum: Part 18. the extent of root resorption after the application of light and heavy controlled rotational orthodontic forces for 4 weeks: A microcomputed tomography study
| Autor: | M. Ali Darendeliler, Allan S. Jones, Canan Colak, Peter Petocz, Andy T.J. Wu, Selma Elekdag-Turk, Tamer Turk |
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| Přispěvatelé: | Ondokuz Mayıs Üniversitesi |
| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
Male
Materials science Root surface Time Factors Rotation Adolescent Chemical Phenomena Tooth Movement Techniques Orthodontic Brackets Root Resorption Dentistry Orthodontics Root resorption Imaging Three-Dimensional stomatognathic system medicine Premolar Alloys Orthodontic Wires Image Processing Computer-Assisted Humans Bicuspid Cementum Prospective Studies Tooth Root Dental Cementum Orthodontic wire business.industry X-Ray Microtomography Microcomputed tomography Compression (physics) medicine.disease Stainless Steel Resorption Biomechanical Phenomena medicine.anatomical_structure Female Stress Mechanical business Dental Alloys |
| DOI: | 10.1016/j.ajodo.2010.01.036 |
| Popis: | colak, canan/0000-0002-5289-1787; Elekdag-Turk, Selma/0000-0002-2799-6501; Darendeliler, Mehmet Ali/0000-0002-8906-8153 WOS: 000290029900010 PubMed: 21536191 Introduction: The aim of this prospective randomized clinical trial was to quantitatively measure and compare the locations, dimensions, and volume of root resorption craters in human premolars after the application of controlled light and heavy rotational orthodontic forces over a 28-day (4-week) period. Methods: Fifteen patients requiring bilateral extraction of maxillary first premolars as part of their orthodontic treatment were recruited for this study. Each patient received a heavy (225 g) rotational force on 1 premolar and a light (25 g) rotational force on the contralateral premolar. Orthodontic rotational forces were applied over 28 days with buccal and palatal cantilever springs; 0.016-inch beta-titanium molybdenum alloys were used to apply the light force and 0.018-inch stainless steel was used for the heavy force. After the 28-day experimental period, the upper first premolars were extracted under stringent protocols to prevent root surface damage. The samples were then scanned using a microcomputed tomography (micro-CT) scan x-ray system (SkyScan 1072, Skyscan, Aartselaar, Belgium), and analyzed using convex hull algorithm (CHULL2D; University of Sydney, Sydney, Australia) software to obtain direct volumetric measurements. Results: The mean volume of resorption craters was 0.42 in the light force group and 0.51 in the heavy force group (P = 0.013). When separated at the root level, the difference in volume of root resorption craters between the 2 groups was significantly different only at the midlevel (P = 0.001). Root resorption craters were consistently detected at the boundaries between the buccal and distal surfaces and the mesial and lingual surfaces. The result supports our hypothesis that positive areas develop significantly more root resorption craters at all 3 levels, as compared with minimal areas (paired t test < 0.001). Conclusions: Heavy rotational forces caused more root resorption than light rotational forces and compression areas (buccal-distal and lingual-mesial surfaces in this study) showed significantly higher root resorption than other areas at all levels of the root. (Am J Orthod Dentofacial Orthop 2011;139:e495-e503) Australian Society of Orthodontics Foundation for Research and Education; Australian Dental Research Foundation Supported by the Australian Society of Orthodontics Foundation for Research and Education and the Australian Dental Research Foundation. |
| Databáze: | OpenAIRE |
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