A Comparison of Maxillo-Mandibular Transverse Width Ratios in Patients with Class III Anteropostier Discrepancies
Abstract
With the emergence of Cone-Beam Computed Tomography (CBCT), it enabled improved evaluation of maxillary and mandibular transverse widths. Historically, orthodontic diagnosis solely utilized the use of lateral cephalometric radiographs which gave a two-dimensional assessment of a three-dimensional entity. The transverse dimension is understudied compared to the vertical and anteroposterior (AP) dimensions. The only analysis currently available uses only posterior landmarks to diagnose transverse discrepancies. We can determine where treatment should be focused if there are transverse differences in the population and improve our diagnosis thus providing our patients with the best treatment outcome. The purpose of this study was to compare the maxillo-mandibular transverse widths in a sample of a Class I patient population to a Class III patient population sample. This study will demonstrate if there is an AP discrepancy, will a concurrent transverse discrepancy exist. If so, it will document what the significance is of the transverse difference between the Class I and III patient populations. Method: Pretreatment CBCT images of 30 Class I patients (Class I), 30 Class III patients due to maxillary hypoplasia (Class IIIR), and 30 Class III patients due to mandibular hyperplasia (Class IIIP) were utilized. Linear transverse measurements were made from anterior and posterior landmarks in the maxilla and mandible. From these linear measurements, a maxillo-mandibular anterior and posterior ratio was calculated. Results: A significance at the p<0.05 level were found to exist in the anterior maxillo-mandibular ratio of the infraorbital foramina to the mandibular canine root apices between the Class I and both Class III groups and in the area of the maxillary canine root apices to the mandibular canine root apices between the Class I and both Class III groups. A significance was observed in the Class III R group with the posterior maxillo-mandibular
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 10, 2014
- Accession Number
- AD1127837
Entities
People
- Cheri Smiley
Organizations
- Uniformed Services University of the Health Sciences