Home  -  About us  -  Editorial board  -  Search  -  Ahead of print  -  Current issue  -  Archives  -  Instructions  -  Subscribe  -  Contacts  -  Advertise - Login 
Year : 2014  |  Volume : 4  |  Issue : 1  |  Page : 34-38

Measuring mandibular asymmetry in Class I normal subjects using 3D novel coordinate system

Department of Orthodontics, University of Alabama at Birmingham, Birmingham, AL, USA

Correspondence Address:
Chung How Kau
Department of Orthodontics, School of Dentistry, University of Alabama at Birmingham, 1919, 7th Avenue, South SDB 305, Birmingham, AL 35294
Login to access the Email id

DOI: 10.4103/2231-0746.133073

PMID: 24987596

Rights and Permissions

Introduction: Orthodontic treatment plays a major role in cosmetic dentistry. A harmonious facial balance is normally the end point in comprehensive orthodontic outcomes. In order to achieve this goal, correct diagnosis of asymmetry should be done starting from the outer facial morphology forms and progressively moving to the dental occlusion. The prime importance of measuring mandibular asymmetry is its tremendous effect on the occlusion. Objective: The aim of this study was to measure mandibular asymmetry in a cohort Class I molar relationship comparing right and left sides using new three-dimensions (3D) imaging technique with the aid of 3D software (in vivo 5.2.3 [San Jose, CA]). Materials and Methods: 35 DICOM files were initially collected retrospectively and seven were excluded due to (1) condylar resorption, (2) history of trauma and (3) unclear DICOM file. A new coordinate system was set for the mid-sagittal plane (MSP), Frankfort horizontal plane and frontal plane (FP). Each cone beam computed tomography (CBCT) was appraised using 16 evaluation criteria bilaterally. Five mandibular landmarks were selected: Condylion_R, Gonion_R, Menton, Gonion_L and Condylion_L. Using these points, the mandible was further divided into four parts: (1) Ramus length right side, body of the mandible right side, body of the Ramus left side and Ramus length left side. The angles between each line and the three different planes were acquired in order to compare each line from a 3D aspect. Mean and standard deviation were calculated for the 28 CBCTs. Results: Significant bilateral differences were reported in the angle between the ramus length and MSP and the ramus length and the FP (P < 0.05). Significant lateroanterior shift of the mandibular ramus on the left side in comparison with the right side. Conclusion: Viewing an object using three different angles between the four parts of the mandible and each plane is a valid method to replicate the actual object.

Print this article     Email this article
 Next article
 Previous article
 Table of Contents

 Similar in PUBMED
   Search Pubmed for
   Search in Google Scholar for
 Related articles
 Citation Manager
 Access Statistics
 Reader Comments
 Email Alert *
 Add to My List *
 * Requires registration (Free)

 Article Access Statistics
    PDF Downloaded562    
    Comments [Add]    
    Cited by others 2    

Recommend this journal