scholarly journals Differentiation between maxillary and malar midface position within the facial profile

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e8200
Author(s):  
Chimène Chalala ◽  
Joseph G. Ghafari
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Cranial Base ◽  
Cone Beam ◽  
Facial Profile ◽  
Computed Tomography Images ◽  
Orthodontic Patients ◽  
Connecting Orbit ◽  
B Test ◽  
Craniofacial Characteristics

Aims To define midfacial position differentiating maxillary and zygomatic regions and to evaluate the corresponding cephalometric characteristics discerning midfacial flatness and fullness. Material and Methods A total of 183 pretreatment lateral cephalometric radiographs of non-growing orthodontic patients (age 25.98 ± 8.43 years) screened at our university orthodontic clinic. The lateral cephalographs of the orthodontic patients were stratified in four groups: flat, normal toward flat, normal toward full, full,according to distances from nasion and sella to points J and G (NJ, SJ, NG and SG). J is the midpoint of the distance connecting orbitale to point A, and G the center of the triangle connecting orbit, key ridge and pterygomaxillary fissure. Statistics included the Kendall tau-b test for best associations among measurements. Results All measurements were statistically significantly different between flat and full groups. The highest associations were between NJ and SJ (τb = 0.71; p < 0.001) and NG and SG (τb = 0.70; p < 0.001). Flat midfaces were characterized by canting of the cranial base and palatal plane, hyperdivergent pattern and maxillary retrognathism. The opposite was true for fuller midfaces. Conclusion Midface skeletal location was assessed differentially in the naso-maxillary and malo-zygomatic structures differentially. Craniofacial characteristics were identified according to this stratification, indicating the potential for application in facial diagnosis and need for testing on 3D cone-beam computed tomography images.

Using Superimposition of 3-Dimensional Cone-Beam Computed Tomography Images with Surface-Based Registration in Growing Patients

2010 ◽  
Vol 34 (4) ◽  
pp. 361-367 ◽  
Author(s):  
Kiyoshi Tai ◽  
Jae Hyun Park ◽  
Katsuaki Mishima ◽  
Hitoshi Hotokezaka
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Measurement Errors ◽  
Peripheral Zone ◽  
Cranial Base ◽  
Cone Beam ◽  
Data Conversion ◽  
Clinical Value ◽  
Computed Tomography Images ◽  
Software Programs

Objective: The purpose of this research was to evaluate a new method of superimposing detailed cone-beam computed tomography (CBCT) images. Materials and Methods: This study used 5 different software programs to transform the digital imaging and communication in medicine (DICOM) data from CBCT image into polygon data. The data conversion errors from different software programs were verified by the polyacetal ball test and the dry skull test. The iterative closest point (ICP) method was used for precise superimposition. To evaluate changes related to growth, three different domains were superimposed in order to investigate appropriate areas for evaluation by the ICP method. Results: The ICP method in the cranial base(excluding the peripheral zone) was indicated as the most reliable surface in this research. There were no measurement errors in converting the image data between software programs. Conclusion: The ICP method in the cranial base (excluding the peripheral zone) is one of the most accurate methods for superimposition when the mandibular rotation or displacement has not occurred during growth or treatment. This 3-dimesional(3D) superimposition technique can be used for a valid and reproducible assessment of treatment outcomes for growing subjects. This method is considered to be of clinical value because of the manageability and 3D accuracy of the data comparison with multi planar reconstruction (MPR) images.

Cranial Base Superimposition of Cone-Beam Computed Tomography Images

2019 ◽  
Vol 30 (6) ◽  
pp. 1809-1814 ◽  
Author(s):  
Orion Luiz Haas Junior ◽  
Raquel Guijarro-Martínez ◽  
Ariane Paredes de Sousa Gil ◽  
Irene Méndez-Manjón ◽  
Adaia Valls-Otañón ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Cranial Base ◽  
Cone Beam ◽  
Computed Tomography Images

scholarly journals Accuracy and Reproducibility of Facial Measurements of Digital Photographs and Wrapped Cone Beam Computed Tomography (CBCT) Photographs

Diagnostics ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 757
Author(s):  
Maged Sultan Alhammadi ◽  
Abeer Abdulkareem Al-mashraqi ◽  
Rayid Hussain Alnami ◽  
Nawaf Mohammad Ashqar ◽  
Omar Hassan Alamir ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Soft Tissue ◽  
Cone Beam Computed Tomography ◽  
High Reliability ◽  
Three Dimensional ◽  
Cone Beam ◽  
Cross Sectional ◽  
Facial Profile ◽  
Digital Photographs ◽  
Gonial Angle

The study sought to assess whether the soft tissue facial profile measurements of direct Cone Beam Computed Tomography (CBCT) and wrapped CBCT images of non-standardized facial photographs are accurate compared to the standardized digital photographs. In this cross-sectional study, 60 patients with an age range of 18–30 years, who were indicated for CBCT, were enrolled. Two facial photographs were taken per patient: standardized and random (non-standardized). The non-standardized ones were wrapped with the CBCT images. The most used soft tissue facial profile landmarks/parameters (linear and angular) were measured on direct soft tissue three-dimensional (3D) images and on the photographs wrapped over the 3D-CBCT images, and then compared to the standardized photographs. The reliability analysis was performed using concordance correlation coefficients (CCC) and depicted graphically using Bland–Altman plots. Most of the linear and angular measurements showed high reliability (0.91 to 0.998). Nevertheless, four soft tissue measurements were unreliable; namely, posterior gonial angle (0.085 and 0.11 for wrapped and direct CBCT soft tissue, respectively), mandibular plane angle (0.006 and 0.0016 for wrapped and direct CBCT soft tissue, respectively), posterior facial height (0.63 and 0.62 for wrapped and direct CBCT soft tissue, respectively) and total soft tissue facial convexity (0.52 for both wrapped and direct CBCT soft tissue, respectively). The soft tissue facial profile measurements from either the direct 3D-CBCT images or the wrapped CBCT images of non-standardized frontal photographs were accurate, and can be used to analyze most of the soft tissue facial profile measurements.

scholarly journals Oral and maxillofacial anatomical structures acknowledgment through cone beam computed tomography images – a teaching practice experience

2019 ◽  
Vol 19 (3) ◽  
pp. 163-171
Author(s):  
Solange Kobayashi-Velasco ◽  
Fernanda Cristina Sales Salineiro ◽  
Ivan Onone Gialain ◽  
Wellington Hideaki Yanaguizawa ◽  
Marcelo Gusmão Paraiso Cavalcanti
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Teaching Practice ◽  
Cone Beam ◽  
Anatomical Structures ◽  
Practice Experience ◽  
Computed Tomography Images

O objetivo deste estudo foi relatar uma metodologia de ensino de tomografia computadorizada de feixe cônico (TCFC) aplicada a estudantes de graduação, avaliando o conhecimento de estruturas anatômicas do complexo dentomaxilofacial. Os estudantes foram orientados quanto às estruturas anatômicas e às aplicações clínicas da TCFC em aulas teóricas e práticas, compreendendo 45 horas de aula. Foram submetidos a duas avaliações, a primeira na metade do semestre, e a segunda no término do semestre. Os escores das avaliações (três variáveis: 1) nome, 2) lado - esquerdo/direito e 3) reconstruções multiplanares (RMP) - imagens ortogonais de identificação) foram comparados para verificar se houve melhora na aprendizagem. Testes de medianas e Wilcoxon compararam os exames intermediário e final. Os valores medianos para a variável 1 foram 6,0 (intermediário) e 8,0 (final). Em relação à variável 2, a mediana variou de 9,0 (intermediário) a 10,0 (final). Quando os resultados da variável 3 foram analisados, ambas as medianas foram 10,0. Houve diferença significativa (teste de Wilcoxon, p<0,05) quando foram comparados os exames intermediário e final, nas três categorias. Correlações lineares foram estabelecidas entre as três categorias e foram estatisticamente significantes para duas associações (“nome da estrutura anatômica” com “lado da estrutura anatômica” e “nome da estrutura anatômica” com “imagens da MPR”). Os estudantes de graduação apresentaram uma melhora em termos do reconhecimento correto das estruturas anatômicas, nome e lado, bem como imagens de MPR quando comparadas as duas avaliações.

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