Three-dimensional evaluation of craniofacial characteristics related to mandibular asymmetries in skeletal Class I patients

Introduction: Evaluation of temporo-mandibular joint (TMJ) anatomy and function is an essential part of orthodontic diagnosis and treatment planning. It has been hypothesized that dental and skeletal malocclusions alter the functional loading of TMJ which can affect joint morphology.Objective: Three dimensional (3D) evaluation of condylar position using CBCT in skeletal Class I and Class III growing subjects.Materials & Method: CBCT images of ten growing skeletal Class I & ten Class III patients in the age range of 7-14 years were analyzed. 3D condylar position were evaluated representing antero-posterior, vertical, laterolateral position of condyle, axial condylar angle and coronal condylar angles which were measured in axial, coronal and sagittal sections using Dolphin Imaging software. Antero-posterior and vertical difference of right and left condyle were measured in axial and coronal sections respectively.Result: Paired t-Test revealed no significant difference between right and left sides of condyle in skeletal Class I as well as Class III subjects. Independent t-test and Mann-Whitney U test showed no significant difference between position of condyle in ClassI and Class III subjects.Conclusion: 3D CBCT analysis shows no significant difference in condylar position of skeletal Class I and Class III subjects.

Download Full-text

Three-dimensional assessment of temporomandibular joints in skeletal Class I, Class II, and Class III malocclusions: Cone beam computed tomography analysis

Journal of the World Federation of Orthodontists ◽

10.1016/j.ejwf.2016.07.001 ◽

2016 ◽

Vol 5 (3) ◽

pp. 80-86 ◽

Cited By ~ 3

Author(s):

Maged Sultan Alhammadi ◽

Mona Salah Fayed ◽

Amr Labib

Keyword(s):

Computed Tomography ◽

Cone Beam Computed Tomography ◽

Three Dimensional ◽

Class I ◽

Cone Beam ◽

Class Iii ◽

Skeletal Class ◽

Temporomandibular Joints ◽

Dimensional Assessment ◽

Tomography Analysis

Download Full-text

Comparison of three-dimensional soft-tissue evaluations between skeletal and pseudo-class III malocclusions

Scientific Reports ◽

10.1038/s41598-020-71772-7 ◽

2020 ◽

Vol 10 (1) ◽

Author(s):

Burak Kale ◽

Muhammed Hilmi Buyukcavus

Keyword(s):

Soft Tissue ◽

Demographic Data ◽

Three Dimensional ◽

Middle Part ◽

Class I ◽

Control Group ◽

Class Iii ◽

Upper Lip ◽

Linear Measurements ◽

Skeletal Class

Abstract The aim of our study was to compare soft tissue measurements with 3D imaging methods in individuals with untreated skeletal and pseudo-Class III malocclusions. The study sample consisted of 75 patients (38 males, 37 females, mean age 12.41 ± 2.35 years) with pseudo- and true skeletal Class III malocclusions and skeletal Class I malocclusions. Soft tissue evaluations of all patients were performed using 3D stereophotogrammetric facial images. In our study, 26 landmarks, 17 linear measurements, 13 angular measurements, and 5 volume measurements were made using the 3dMD Vultus software. The significance was determined to be p < 0.05 in ANOVA, Tukey tests. No significant differences were found among the groups in terms of demographic data (p > 0.05). The skeletal Class I control group had a significantly more extended upper lip and vermillion length as compared to the Class III groups. The soft tissue convexity angle and upper nasal angle were found to be wider in the Class III malocclusion group compared to those in the Class I control group. While the pseudo-Class III group had a significantly lower midface volume, chin volume was significantly higher in the skeletal class group. Upper lip volume was significantly higher in the Class I group. Using 3dMD for guiding clinicians in the differential soft and hard tissue diagnosis of pseudo-Class III malocclusions, differences were revealed in Class I patients in the middle part of the face. In the differential diagnosis of true Class III malocclusions, chin volume was found to be different from that of Class I patients.

Download Full-text

New three-dimensional cephalometric analyses among adults with a skeletal Class I pattern and normal occlusion

The Korean Journal of Orthodontics ◽

10.4041/kjod.2013.43.2.62 ◽

2013 ◽

Vol 43 (2) ◽

pp. 62 ◽

Cited By ~ 39

Author(s):

Mohamed Bayome ◽

Jae Hyun Park ◽

Yoon-Ah Kook

Keyword(s):

Three Dimensional ◽

Class I ◽

Skeletal Class ◽

Normal Occlusion

Download Full-text

Three-Dimensional Mandible Reduction: Correction of Occlusal Class I in Skeletal Class III Cases

Aesthetic Plastic Surgery ◽

10.1007/s00266-006-0001-3 ◽

2006 ◽

Vol 30 (5) ◽

pp. 553-559 ◽

Cited By ~ 3

Author(s):

Hoon Jin ◽

Byoung Ho Kim ◽

Youngjoo Judie Woo

Keyword(s):

Three Dimensional ◽

Class I ◽

Class Iii ◽

Skeletal Class ◽

Mandible Reduction

Download Full-text

Three-dimensional study of the upper airway in different skeletal Class II malocclusion patterns

The Angle Orthodontist ◽

10.2319/112117-806.1 ◽

2018 ◽

Vol 89 (1) ◽

pp. 93-101

Author(s):

Fernando C. Brito ◽

Daniel P. Brunetto ◽

Matilde C. G. Nojima

Keyword(s):

Linear Regression Analysis ◽

Three Dimensional ◽

Upper Airway ◽

Class Ii ◽

Class I ◽

Class Ii Malocclusion ◽

Skeletal Class ◽

Skeletal Class Ii ◽

Intergroup Comparison ◽

Reconstruction Software

ABSTRACT Objectives: To characterize upper airway volume and morphology in patients with different skeletal patterns of Class II malocclusion compared to Class I. Materials and Methods: A total of 197 individuals who had cone-beam computed tomography were allocated into groups according to ANB, SNA, and SNB angles (Class I, Class II maxillary protrusion, Class II mandibular retrusion), each subdivided into hypodivergent, normal, and hyperdivergent. Nasopharynx (NP), oropharynx (OP), and hypopharynx (HP) were assessed with three-dimensional image reconstruction software. Results: Intergroup comparison did not detect significant differences in volume and morphology of NP, OP, and HP. The males displayed larger OP and HP volume than the females. Positive correlations between age and NP, OP, HP volume and between craniocervical angle and OP and HP volume were observed. Linear regression analysis detected a tendency for OP and HP volume to increase as maxillary and mandibular length increased. Conclusions: Upper airway volume and morphology were similar in different skeletal patterns of Class II malocclusion. Actual upper and lower jaw lengths were more closely related to upper airway volume and morphology than the angles that reflected their position relative to the cranial base.

Download Full-text

Analysis of Three-Dimensional Morphological Differences in the Mandible between Skeletal Class I and Class II with CBCT Fixed-Point Measurement Method

Scanning ◽

10.1155/2021/9996857 ◽

2021 ◽

Vol 2021 ◽

pp. 1-9

Author(s):

Qiang Dong ◽

HaoYu Shi ◽

Qi Jia ◽

Yueyi Tian ◽

Keqian Zhi ◽

...

Keyword(s):

Anterior Part ◽

Three Dimensional ◽

Morphological Characteristics ◽

Vertical Direction ◽

Class Ii ◽

Class I ◽

Skeletal Class ◽

Skeletal Class Ii ◽

Mandibular Body

This study was aimed at determining the three-dimensional differences in the mandible morphology between skeletal class I and II patients, at exploring the pathogenic mechanisms and morphological characteristics of skeletal class II, and at providing clinical references. The subjects were assigned to two groups according to the size of ANB angle: skeletal class I ( 2 ° < ANB angle < 5 ° ) and skeletal class II ( 5 ° < ANB angle < 8 ° ). After cone-beam computed tomography (CBCT) scanning, 31 landmarks and 25 measurement items were determined by In Vivo Dental 5.1 software (Anatomage, CA) for statistical analysis. The results were as follows: Co-Go, Go-Me, and CdM-CdD in skeletal class II cases were smaller than those in skeletal class I, and GoR-Me-GoL, GoR-Me-CoL, and, Ig-Men were larger than those in skeletal class I cases. In conclusion, there were significant differences in the three-dimensional morphology of the mandible between skeletal class I and class II patients. The vertical growth of the ramus, the horizontal growth of the mandibular body, and the condyle in skeletal class II patients were smaller than those in skeletal class I cases. In skeletal class II, the growth of the anterior part of the mandible in the vertical direction was larger than that in skeletal class I, and the shape of the mandible was more extended.

Download Full-text