Abstract

Purpose: The aim of this study was to determine the long term effect of a centric interference on canine tooth wear (CTW) and on centric occlusion (CO) and maximal intercuspation (MIP) variance. Materials and Methods: Thirty subjects, 11 males and 19 females, were selected based on inclusion and exclusion criteria. Changes in enamel volume were studied between the end of orthodontic treatment (T2) and at least seven years post treatment (T4). All models were scanned using a high resolution desktop scanner, (OrthoInsight 3D Scanner™, MotionView LLC). T4 models were articulated using a Panadent® Articulator and evaluated for dental interferences and CO/MIP variance using the incisal pin locator. The canines were evaluated for volumetric CTW from T2 to T4 using Geomagic Control (3D Systems, South Carolina 2014). Intraclass correlation test was used to evaluate repeatability. A Chi-Square correlation test was used to evaluate the relationship between interference and CTW. A Spearman-rho test was used to evaluate the relationship between CTW and CO/MIP discrepancy. Results: The presence of a posterior interference, indicated by an initial contact in CO, was present in all subjects. Sixty-seven percent of subjects showed greater CTW opposite

the side of the interference, which was not statistically significant (p=0.114). There was a relationship between an interference on the left side and CTW on the opposite side (p=0.039) but no relationship between a right interference and CTW (p=0.308). CO/MIP discrepancy had a moderate correlation with TW (rho=0.558, p=0.001). The mean CTW/year was 0.13±0.16 mm3. Males had 0.22±.21 mm3 and females had 0.07±0.16 mm3 of CTW/yr, which was a statistically significant difference (p=0.008). Sixty percent of the centric interferences were due to the maxillary second molar. Conclusions: No statistical relationship was found between centric interferences and CTW. There was a relationship between a left centric interference and CTW, but no relationship between a right centric interference and CTW. There was a moderate relationship between CTW and CO/MIP discrepancy. There was a statistically significant difference in CTW between males and females. Most of the interferences were due to the disto-lingual cusp of the maxillary second molars.

LLU Discipline

Orthodontics and Dentofacial Orthopedics

Department

Orthodontics and Dentofacial Orthopedics

School

School of Dentistry

First Advisor

Leggitt, V. Leroy

Second Advisor

Taylor, L. Parnell

Third Advisor

Caruso, Joseph M.

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

2018

Date (Title Page)

9-2018

Language

English

Library of Congress/MESH Subject Headings

Tooth Abrasion; Tooth Erosion

Subject - Local

Centric Interferences; Canine teeth; Tooth wear; Centric Occlusion

Type

Thesis

Page Count

52

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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