Abstract

Objective: This study aims to evaluate force (F) and torque (Tq) generated by a novel “loop-design” clear aligner compared to the F and Tq generated by a traditional clear aligner design. The novel design may reduce the risk of orthodontic root resorption (ORR), by reducing forces during tooth rotation.

Materials and Methods: Traditional clear aligners (T) and ArchForm Loop clear aligners (AFL) were compared for differences in F and Tq exerted on selected canine and molar teeth. The test tooth was sectioned out of the test model, attached to a load cell and replaced in the test model with two-degrees mesio-buccal (MB) rotation. Aligners were designed in ArchForm Design Software. The two sets of aligners were fully seated on the testing models and the F and Tq recorded in x, y, and z axis. The methods sequence can be divided into the following five stages: 1) Test Model Construction, 2) Clear Aligner Design, 3) Clear Aligner Construction, 4) Testing, and 5) Statistical analysis

Results: The F and Tq exerted by the AFL aligners on the molar tooth was statistically significantly different than the F and Tq exerted by the T aligners. The independent sample T-test and its assumptions indicate that there is no normality in the x, y, or z axis, (Shaprio-Wilk, p <.001). Therefore, the Mann-Whitney U test was used. There was a statistically significant decrease in Tq with the AFL aligner on the molar in the x-axis and z-axis (p < .05, p <.05). There was a statistically significant decrease in F in the y-axis of the molar with the AFL aligner (p < .05).

Conclusions: There was no statistically significant difference in force or torque applied to the canine by Traditional and ArchForm loop style clear aligners. The ArchForm loop style clear aligners showed a statistically significant reduction in torque applied to the molar (in the x- and z-axes). The ArchForm loop style clear aligners showed a statistically significant reduction in force applied to the molar in the y-axis. Further studies are warranted to evaluate the potential clinical advantages of the ArchForm loop style clear aligners for molar rotation.

LLU Discipline

Orthodontics and Dentofacial Orthopedics

Department

Orthodontics and Dentofacial Orthopedics

School

School of Dentistry

First Advisor

V. Leroy Leggitt

Second Advisor

Mohammed Toufic Jeiroudi

Third Advisor

William Emmerson

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

2021

Date (Title Page)

7-2021

Language

English

Library of Congress/MESH Subject Headings

Orthodontic Appliances, Removable; Rotation; Torque

Type

Thesis

Page Count

xi, 37 p.

Digital Format

PDF

Digital Publisher

Loma Linda University Libraries

Usage Rights

This title appears here courtesy of the author, who has granted Loma Linda University a limited, non-exclusive right to make this publication available to the public. The author retains all other copyrights.

Collection

Loma Linda University Electronic Theses and Dissertations

Collection Website

http://scholarsrepository.llu.edu/etd/

Repository

Loma Linda University. Del E. Webb Memorial Library. University Archives

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