scholarly journals Effects of Changes in the Frankfort Horizontal Plane Definition on the Three-Dimensional Cephalometric Evaluation of Symmetry

2020 ◽  
Vol 10 (22) ◽  
pp. 7956
Author(s):  
Utkarsh Mangal ◽  
Jae Joon Hwang ◽  
Heon Jo ◽  
Sung Min Lee ◽  
Yun-Hoa Jung ◽  
...  
Keyword(s):  
Spatial Orientation ◽  
Horizontal Plane ◽  
Three Dimensional ◽  
Adult Patients ◽  
Cone Beam ◽  
Tomographic Images ◽  
Future Studies ◽  
Computed Tomographic ◽  
3D Cephalometry ◽  
Frankfort Horizontal Plane

The plane formed by the intersection of bilateral porions (PoR and PoL) and left orbitale (OrL) is conventionally defined as the Frankfort horizontal (FH) plane. We aim to test the influence of the FH plane definition on a 3D cephalometric assessment. We selected 38 adult patients (20 males, 18 females; average age: 22.87 ± 5.17 years) without any gross asymmetry from retrospective records and traced and analyzed their cone-beam computed tomographic images. The findings were categorized into the following four groups: FH1: conventional; FH2: PoR, PoL, right orbitale (OrR); FH3: OrR, OrL, PoL; FH4: OrR, OrL, PoR. The average menton (Me) deviation from the MSP was statistically significant for the FH1 group (0.56 ± 0.27 mm; p < 0.001), compared to the FH3 (1.37 ± 1.23 mm) and FH4 (1.33 ± 1.16 mm) groups. The spatial orientation level (SOL) of the FH plane showed a marked difference (p < 0.05) between the FH2 (0.602° ± 0.503°) and FH4 (0.944° ± 0.778°) groups. The SOL of the MSP was comparatively small (p < 0.001) for FH2 (0.015° ± 0.023°) in comparison to both FH 3 (0.644° ± 0.546°) and FH 4 (0.627° ± 0.516°). Therefore, the FH plane definition can significantly influence the interpretation of cephalometric findings. Future studies should focus on standardization to improve the reliability and reproducibility of 3D cephalometry.

scholarly journals Evaluation of mandibular volume classified by vertical skeletal dimensions with cone-beam computed tomography

2016 ◽  
Vol 86 (6) ◽  
pp. 949-954 ◽  
Author(s):  
Takatoshi Nakawaki ◽  
Tetsutaro Yamaguchi ◽  
Daisuke Tomita ◽  
Yu Hikita ◽  
Mohamed Adel ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Three Dimensional ◽  
Cone Beam ◽  
Class Iii ◽  
Tomographic Images ◽  
Computed Tomographic ◽  
Significant Difference ◽  
Detailed Assessment ◽  
Lateral Cephalometry

ABSTRACT Objective: To investigate the relationship between anteroposterior and vertical differences in maxillofacial morphology and mandibular volume. Materials and Methods: Subjects comprised 213 Japanese adults (84 males and 129 females) who were divided into three groups based on mandibular basal arch (ANB) and Wits, measured in a cephalometric analysis: Class I (−1° ≤ ANB &lt; 4°,−1 mm ≤ Wits &lt; 0 mm), Class II (ANB ≥ 4°, Wits ≥ 0), and Class III (ANB &lt;−1°, Wits &lt;−1 mm). Subjects were also divided into three groups based on the mandibular plane angle (Mp), as follows: hypodivergent (Mp &lt; 23°), normodivergent (Mp  =  23–30°), and hyperdivergent (Mp &gt; 30°) groups. Mandibular volume was measured from cone-beam computed tomographic images that were analyzed using Analyze™ image processing software and compared among the three groups in each classification. Results: No significant differences were noted in mandibular volume among Classes I, II, and III. An inverse relationship was found between mandibular volume and Mp, and a significant difference was noted in mandibular volume between the hypodivergent and hyperdivergent groups. Conclusions: In addition to two-dimensional analysis, such as lateral cephalometry, three-dimensional information such as volume, provided by cone-beam computed tomography, contributes to a more detailed assessment of maxillofacial morphology.

scholarly journals Three-dimensional Frankfort horizontal plane for 3D cephalometry: a comparative assessment of conventional versus novel landmarks and horizontal planes

2017 ◽  
Vol 40 (3) ◽  
pp. 239-248 ◽  
Author(s):  
Pisha Pittayapat ◽  
Reinhilde Jacobs ◽  
Michael M Bornstein ◽  
Guillaume A Odri ◽  
Ivo Lambrichts ◽  
...  
Keyword(s):  
Horizontal Plane ◽  
Three Dimensional ◽  
Comparative Assessment ◽  
3D Cephalometry ◽  
Frankfort Horizontal Plane

scholarly journals Airflow inside the nasal cavity: visualization using computational fluid dynamics

2010 ◽  
Vol 4 (4) ◽  
pp. 657-661 ◽  
Author(s):  
Mohammed Zubair ◽  
Vizy Nazira Riazuddin ◽  
Mohammed Zulkifly Abdullah ◽  
Rushdan Ismail ◽  
Ibrahim Lutfi Shuaib ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Nasal Cavity ◽  
Three Dimensional ◽  
Clinical Importance ◽  
Navier Stokes ◽  
Tomographic Images ◽  
Computed Tomographic ◽  
Continuity Equations ◽  
Cfd Method

Abstract Background: It is of clinical importance to examine the nasal cavity pre-operatively on surgical treatments. However, there is no simple and easy way to measure airflow in the nasal cavity. Objectives: Visualize the flow features inside the nasal cavity using computational fluid dynamics (CFD) method, and study the effect of different breathing rates on nasal function. Method: A three-dimensional nasal cavity model was reconstructed based on computed tomographic images of a healthy Malaysian adult nose. Navier-Stokes and continuity equations for steady airflow were solved numerically to examine the inspiratory nasal flow. Results: The flow resistance obtained varied from 0.026 to 0.124 Pa.s/mL at flow-rate from 7.5 L/min to 40 L/min. Flow rates by breathing had significant influence on airflow velocity and wall shear-stress in the vestibule and nasal valve region. Conclusion: Airflow simulations based on CFD is most useful for better understanding of flow phenomenon inside the nasal cavity.

scholarly journals ASSESSMENT OF RADIOMORPHOMETRIC INDICES ON DIGITAL PANORAMIC AND CONE BEAM COMPUTED TOMOGRAPHIC IMAGES IN OSTEOPOROTIC EGYPTIAN FEMALES.

2017 ◽  
Vol 5 (5) ◽  
pp. 200-212
Author(s):  
SarahM. Kenawy ◽  
◽  
DinaM.El Beshlawy ◽  
MushiraM. Dahaba ◽  
◽  
...  
Keyword(s):  
Cone Beam ◽  
Tomographic Images ◽  
Computed Tomographic

scholarly journals Three-dimensional cone beam computed tomographic image reorientation using soft tissues as reference for facial asymmetry diagnosis

2013 ◽  
Vol 84 (1) ◽  
pp. 38-47 ◽  
Author(s):  
Jae-Kyu Lee ◽  
Pil-Kyo Jung ◽  
Cheol-Hyun Moon
Keyword(s):  
Soft Tissue ◽  
Soft Tissues ◽  
Three Dimensional ◽  
Facial Asymmetry ◽  
Cone Beam ◽  
Expert Group ◽  
Computed Tomographic ◽  
Asymmetry Analysis ◽  
Cbct Image ◽  
Facial Midline

ABSTRACT Objective: To investigate discrepancies in results of facial asymmetry analysis using different cone beam computed tomography (CBCT) image reorientation methods and the effectiveness of soft tissue as a reorientation reference for analysis of facial asymmetry. Materials and Methods: An asymmetric group of 30 patients with 4 mm or more of chin point (menton [Me]) deviation and a symmetric group of 30 patients with less than 4 mm of deviation of Me were chosen as study subjects. Three orientation methods were used to calculate and compare Me deviation values of the 60 subjects. Two methods used only skeletal landmarks for reference, and one method included the soft tissue landmarks around the eye. Preferences of an expert group for the facial midline as determined by each reorientation method were also examined. Results: The examinations showed significant discrepancies in Me deviation values between the three reorientation methods. The expert group showed the greatest preference for the facial midline reorientation method that incorporated soft tissue landmarks of the eye. Conclusions: These study findings suggest that the inclusion of soft tissue landmarks, especially those around the eyes, is effective for three-dimensional CBCT image reorientation for facial asymmetry analysis.

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