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Class II elastics, Force, Orthodontics

Stanley, Joseph C

Supervisor and department: Major, Paul Dentistry

Examining committee member and department: Romanyk, Daniel Dentistry Heo, Giseon Dentistry Carey, Jason Engineering El-Bialy, Tarek Dentistry

Department: Medical Sciences-Orthodontics

Specialization:

Date accepted: 2017-01-30T16:14:48Z

Graduation date: 2017-06:Spring 2017

Degree: Master of Science

Degree level: Master's

Abstract: Abstract Objectives: An orthodontic simulator OSIM device was used to compare the force systems generated by class II elastics on a ½ cusp class II malocclusion using four combinations of two elastic types and two archwire types. Methods: 3-dimensional forces and moments due to class II elastics were measured individually for each tooth 7-7 using Damon Q brackets on the maxillary and mandibular arches. Four test groups n=44 were compared, each of a different combination of two elastic types 3-16-, 2oz and 4.5oz and two archwire types 0.014- nickel titanium and 0.019- x 0.025- stainless steel. Results: Only the upper canines and lower first molars recorded clinically significant forces 0.3N and moments 5Nmm. 2oz and 4.5oz class II elastics produced clinically significant vertical extrusive forces and horizontal forces along the archwire to normalize a class II malocclusion. Stainless steel archwire minimized the extrusive forces of the 4.5oz elastics compared to nickel titanium archwire Conclusions: 2oz and 4oz class II elastics produced clinically significant vertical extrusive forces and horizontal forces along the archwire. Archwire type had no effect on 2oz class II elastics whereas 0.019- x 0.025-stainless steel significantly reduced the vertical extrusive effects of the larger 4.5oz elastics.

Language: English

DOI: doi:10.7939-R3F766K4M

Rights: This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for the purpose of private, scholarly or scientific research. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.





Author: Stanley, Joseph C

Source: https://era.library.ualberta.ca/


Teaser



The Effects of Elastic Size and Archwire Type on 3-Dimensional Force Systems When Using Class II Interarch Elastics by Joseph Stanley A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science
 Medical Sciences – Orthodontics University of Alberta ©Joseph Stanley, 2017 Abstract Objectives: An orthodontic simulator (OSIM) device was used to compare the force systems generated by class II elastics on a ½ cusp class II malocclusion using four combinations of two elastic types and two archwire types. Methods: 3-dimensional forces and moments due to class II elastics were measured individually for each tooth (7-7) using Damon Q brackets on the maxillary and mandibular arches.
Four test groups (n=44) were compared, each of a different combination of two elastic types (3-16-, 2oz and 4.5oz) and two archwire types (0.014- nickel titanium and 0.019- x 0.025- stainless steel). Results: Only the upper canines and lower first molars recorded clinically significant forces (0.3N) and moments (5Nmm).
2oz and 4.5oz class II elastics produced clinically significant vertical extrusive forces and horizontal forces along the archwire to normalize a class II malocclusion.
Stainless steel archwire minimized the extrusive forces of the 4.5oz elastics compared to nickel titanium archwire Conclusions: 2oz and 4oz class II elastics produced clinically significant vertical extrusive forces and horizontal forces along the archwire.
Archwire type had no effect on 2oz class II elastics whereas 0.019- x 0.025-stainless steel significantly reduced the vertical extrusive effects of the larger 4.5oz elastics. ii Dedication To Jennifer, this was a tag team effort.
Without you none of this would be possible. To Isaac, Elsa and Maud, you guys are my greatest accomplishment.
I hope you can read this someday and be inspired to follow your dreams. To Mom and Dad, your love and support over the years is immeasurable.
I am forever grateful. iii ...





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