The Use of CBCTs to Determine Relative Anchorage Values by Measuring Maxillary Root Surface Areas within Bone
Abstract
INTRODUCTION: Anchorage is vital in both controlling tooth movement and understanding pressure distribution from force application. Relative anchorage value (RAV), as defined by the authors, is the root surface area (SA) below crestal bone. OBJECTIVE: The purpose of this study is to use CBCTs to determine RAVs of teeth by measuring and comparing the root SA of anterior to posterior teeth. These values will be compared to the modified Freeman study cited by Dr. Proffit in Contemporary Orthodontics. MATERIALS AND METHODS: A retrospective study reviewed images captured on 3D Accuitomo 170 (Irvine, CA), ranging from small FOV (40x40mm) to large FOV (170x120mm). Digital Imaging and Communications in Medicine (DICOM) files meeting the inclusion criteria were transported into Materialise Mimics (Leuven, Belgium) to outline and isolate root structure from alveolar bone. Stereolithography (STL) files from Mimics was then imported into Geomagic Freeform Plus (Rock Hill, SC) to analyze root surface area below crestal bone. RAVs of posterior teeth were compared to anterior teeth for a first premolar extraction scenario. In addition, a ratio was calculated to allow for comparison of RAVs from this study to anchorage values from the modified Freeman study.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 30, 2019
- Accession Number
- AD1128110
Entities
People
- Jonathan Y. Stateson
Organizations
- Uniformed Services University of the Health Sciences