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Permanent link (DOI): https://doi.org/10.7939/R39W0967D

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Effect of low intensity pulsed ultrasound on orthodontically induced root resorption caused by torque: A prospective double blinded controlled clinical trial Open Access

Descriptions

Other title
Subject/Keyword
torque
LIPUS
Low intensity pulsed ultrasound
root resorption
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Raza, Hasnain
Supervisor and department
Dr. Dederich, Douglas (Department of dentistry)
Dr. El-Bialy, Tarek (Department of Dentistry)
Dr. Major, Paul (Department of dentistry)
Examining committee member and department
Dr. Graf, Daniel (Department of dentistry)
Dr. El-Bialy, Tarek (Department of Dentistry)
Dr. Major, Paul (Department of dentistry)
Dr. Dederich, Douglas (Department of dentistry)
Dr. Febbraio, Maria (Department of dentistry)
Department
Medical Sciences-Oral Biology
Specialization

Date accepted
2015-07-13T10:36:00Z
Graduation date
2015-11
Degree
Master of Science
Degree level
Master's
Abstract
Orthodontically induced root resorption (OIIRR) is an undesirable consequence of orthodontic treatment and may lead to permanent loss of root structure. A previous clinical trial demonstrated the effect of LIPUS on tipping type of OTM and reported that LIPUS can promote cementogenesis. However, the effect of LIPUS on other types of OTM still remains unclear. Therefore, the aim of this study was to evaluate the effects of LIPUS on OIIRR caused by torque in human subjects. The study sample consisted of 10 healthy human patients between the ages of 12-35 years at the start of the study who required extraction of all first premolars as a part of their routine orthodontic treatment plan. A 15 degree twist was applied in the arch wire using 0.019 x 0.025 TMA wire producing a torque (buccal root) at the bracket level of approximately 5 N-mm. Using a split mouth design, randomization and blinding, one side of the arch received LIPUS for twenty minutes per day for four weeks at an incident intensity of 30mW/cm2 of the transducers surface area. The other side served as a self-control which received a sham transducer. After 4 weeks, all first premolars were extracted for regular orthodontic treatment and a micro-CT analysis was performed of these extracted teeth. Comparison between the two groups was performed using Linear mixed model analysis. LIPUS treated teeth showed significantly less damage compared to control as LIPUS reduced the total volume of resorption lacunae by a mean difference of (0.537 +/- 0.092 mm3) (P<0.001) and percentage of root resorption by a mean difference of (0.33 +/- 0.05) (P<0.001). Also, significantly less number of resorption lacunae were found on all root surfaces in LIPUS group compared to control except for the distal surface. LIPUS significantly reduced the number of RL at the apical third and middle third of the root. This reduction in the severity of OIIRR can be clinically significant considering more extensive OIIRR which occurs during the entire course of orthodontic treatment. However, future long term studies are required to determine the efficacy of LIPUS in reducing the severity of OIIRR to a clinical significant level over an extended period of time, as during regular orthodontic treatment.
Language
English
DOI
doi:10.7939/R39W0967D
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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