Abstract

Introduction: Growth of the maxilla and mandible follow identifiable vectors of facial growth such as the Rickett’s Facial Axis (FA) and the Down’s Y-axis (YA). The purpose of this study was to evaluate the correlation between the anterior inferior vomer axis (AIVA) and posterior inferior vomer axis (PIVA) with the FA and YA in cases with high (32 degrees and above) and low (20 degrees and below) mandibular plane angles.

Methods: Pretreatment cone beam computed tomography (CBCT) scans of 94 patients treated at the Loma Linda University Graduate Orthodontic Clinic meeting the inclusion criteria were used in this retrospective study. The inclusion criteria were: bilateral Class I occlusion, no craniofacial malformations, no known airway problems, a pretreatment CBCT, Ricketts mandibular plane angle 20 degrees and below or 32 degrees and above, age 11-15 or 19-45. Patients were separated into high angle and low angle groups determined by Ricketts mandibular plane angle. Subjects in both high and low angle groups were separated into two age groups (11-15 and 19-45). The FA and YA were compared with the PIVA and the AIVA for each group. The nasion-basion plane was used as a reference plane.

Results: The AIVA and PIVA were significantly correlated with the FA (P =0.001, P =0.016) and YA (P ≤0.0001, P ≤0.0001) in low angle subjects. In high angle subjects, the PIVA was significantly correlated with FA (P ≤0.0001) and YA (P ≤0.0001). The AIVA in high angle subjects was not correlated with either FA (P =0.415) or YA (P =0.399).

Conclusions: The PIVA likely represents a combination vector of both drift and displacement of the maxilla. The AIVA likely represents a vector of principally maxillary displacement.

LLU Discipline

Orthodontics and Dentofacial Orthopedics

Department

Orthodontics and Dentofacial Orthopedics

School

School of Dentistry

First Advisor

R. David Rynearson

Second Advisor

V. Leroy Leggitt

Third Advisor

James R. Farrage

Degree Name

Master of Science in Orthodontics and Dentofacial Orthopedics (MSODO)

Degree Level

M.S.

Year Degree Awarded

2013

Date (Title Page)

9-2013

Language

English

Library of Congress/MESH Subject Headings

Maxilla - anatomy & histology; Mandible - anatomy & histology

Type

Thesis

Page Count

x, 34 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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