scholarly journals 3D-μCT Cephalometric Measurements in Mice

10.5772/24234 ◽  
2011 ◽  
Author(s):  
F. de ◽  
A. Alvarez-Suarez ◽  
S. Costilla ◽  
I. Noval ◽  
J. A. ◽  
...  
Keyword(s):  
Cephalometric Measurements

scholarly journals Comparison of cephalometric measurements between conventional and automatic cephalometric analysis using convolutional neural network

2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Sangmin Jeon ◽  
Kyungmin Clara Lee
Keyword(s):  
Neural Network ◽  
Convolutional Neural Network ◽  
Rapid Development ◽  
Cephalometric Analysis ◽  
Anatomical Landmarks ◽  
Limits Of Agreement ◽  
Mandibular Incisor ◽  
Lateral Cephalograms ◽  
Dental Measurements ◽  
Cephalometric Measurements

Abstract Objective The rapid development of artificial intelligence technologies for medical imaging has recently enabled automatic identification of anatomical landmarks on radiographs. The purpose of this study was to compare the results of an automatic cephalometric analysis using convolutional neural network with those obtained by a conventional cephalometric approach. Material and methods Cephalometric measurements of lateral cephalograms from 35 patients were obtained using an automatic program and a conventional program. Fifteen skeletal cephalometric measurements, nine dental cephalometric measurements, and two soft tissue cephalometric measurements obtained by the two methods were compared using paired t test and Bland-Altman plots. Results A comparison between the measurements from the automatic and conventional cephalometric analyses in terms of the paired t test confirmed that the saddle angle, linear measurements of maxillary incisor to NA line, and mandibular incisor to NB line showed statistically significant differences. All measurements were within the limits of agreement based on the Bland-Altman plots. The widths of limits of agreement were wider in dental measurements than those in the skeletal measurements. Conclusions Automatic cephalometric analyses based on convolutional neural network may offer clinically acceptable diagnostic performance. Careful consideration and additional manual adjustment are needed for dental measurements regarding tooth structures for higher accuracy and better performance.

Linear Mandibular Measurements: Comparison between Orthopantomograms and Lateral Cephalograms

2009 ◽  
Vol 46 (2) ◽  
pp. 147-153 ◽  
Author(s):  
E. M. Ongkosuwito ◽  
M. M. J. Dieleman ◽  
A. M. Kuijpers-Jagtman ◽  
P. G. H. Mulder ◽  
J. W. van Neck
Keyword(s):  
Interobserver Variability ◽  
Intraclass Correlation ◽  
Kappa Statistics ◽  
Magnification Factor ◽  
Linear Measurements ◽  
Lateral Cephalogram ◽  
X Ray ◽  
Lateral Cephalograms ◽  
Left And Right ◽  
Cephalometric Measurements

Objective: To investigate the reliability of length measurements of the mandible by comparing orthopantomograms (OPTs) with lateral cephalograms. Design: Observational study. Setting: OPTs and lateral cephalograms were taken of 20 human dry skulls. Four orthodontists and four maxillofacial surgeons located landmarks on all radiographs using a computer program for cephalometric measurements. Intraobserver and interobserver variability in locating landmarks was assessed, as well as positioning of the skulls prior to radiography between the x-ray assistants. Magnification differences between the left and right side of the mandible on the OPT were determined for five skulls. Kappa statistics were used to calculate the intraclass correlation coefficient for intraobserver and interobserver differences. An F test was used to assess differences between methods and between type of observer. Results: No significant differences were found in the magnification factor of the left and right side of the mandible. Compared with a lateral cephalogram, the OPT had comparable reliability in measuring mandibular distances condylion-gonion, gonion-menton, and condylion-menton. No significant differences were observed between the x-ray assistants in taking the OPTs and lateral cephalograms or in repositioning the skulls. Significant differences were found between orthodontists and maxillofacial surgeons for landmark measurements. Conclusion: An OPT is as reliable as a lateral cephalogram for linear measurements of the mandible (condylion-gonion, gonion-menton, and condylion-menton).

CEPHALOMETRIC MEASUREMENTS ON ADULT PATIENTS WITH NONOPERATED CLEFT PALATES

1959 ◽  
Vol 24 (1) ◽  
pp. 53-61 ◽  
Author(s):  
FERNANDO ORTIZ-MONASTERIO ◽  
ALFONSO SERRANO REBEIL ◽  
MANUEL VALDERRAMA ◽  
ROLANDO CRUZ
Keyword(s):  
Adult Patients ◽  
Cephalometric Measurements

scholarly journals Dynamic smile evaluation in different skeletal patterns

2016 ◽  
Vol 86 (6) ◽  
pp. 1019-1025 ◽  
Author(s):  
Noshi Siddiqui ◽  
Pradeep Tandon ◽  
Alka Singh ◽  
Jitesh Haryani
Keyword(s):  
Analysis Of Variance ◽  
Upper Lip ◽  
Chi Square ◽  
Causative Factors ◽  
Skeletal Pattern ◽  
Width Change ◽  
Positive Correlations ◽  
Post Hoc ◽  
Cephalometric Measurements ◽  
Horizontal Pattern

ABSTRACT Objective: To evaluate dynamic smile in different skeletal patterns and to correlate vertical smile parameters with the underlying causative factors. Materials and Methods: A total of 150 participants ranging in age from 16–25 years were selected and divided into one of three groups—horizontal, average, and vertical skeletal pattern—using the following three cephalometric parameters: SN-MP, FMA, and Jarabak ratio. Videographic records of smile were obtained, and measurements were recorded and analyzed at rest, including upper lip length, and during smile, including maxillary incisal display, interlabial gap, intercommisural width, change in upper lip length, and smile arc. Differences among the three groups were subjected to two-way analysis of variance and post hoc and chi-square tests for smile arc. Correlations between vertical smile variables and vertical skeletal (N-ANS, N-Me) and dental cephalometric measurements (U1 to palatal plane) were also investigated. Results: Vertical parameters were significantly increased in the vertical pattern when compared with the horizontal pattern, ie, upper lip length (P < .01), maxillary incisal display (P < .001), interlabial gap (P < .001), and change in upper lip length (P < .001), whereas intercommisural width was significantly decreased in vertical pattern when compared with the horizontal pattern (P < .001). Flat smile arc was seen more frequently in the horizontal pattern. Positive correlations were found between the N-Me, U1-PP, and change in upper lip length with vertical smile parameters. Conclusions: Different skeletal patterns exhibit their characteristic smile features. Upper lip length is not responsible for increased incisal display during smile. Increased incisal display during smile is more closely associated with upper lip elevation than vertical skeletal and dental factors.

scholarly journals Development of 3D statistical mandible models for cephalometric measurements

2012 ◽  
Vol 42 (3) ◽  
pp. 175 ◽  
Author(s):  
Sung-Goo Kim ◽  
Won-Jin Yi ◽  
Soon-Jung Hwang ◽  
Soon-Chul Choi ◽  
Sam-Sun Lee ◽  
...  
Keyword(s):  
Cephalometric Measurements

scholarly journals Effects of the condylar process fracture on facial symmetry in rats submitted to protein undernutrition

2011 ◽  
Vol 26 (2) ◽  
pp. 88-93 ◽  
Author(s):  
Lucimar Rodrigues ◽  
Luciana Corrêa ◽  
João Gualberto de Cerqueira Luz
Keyword(s):  
Serum Proteins ◽  
Mandibular Condyle ◽  
Median Line ◽  
Condylar Fracture ◽  
Fracture Group ◽  
Facial Symmetry ◽  
Maxilla And Mandible ◽  
The Right ◽  
Condyle Fracture ◽  
Cephalometric Measurements

PURPOSE: To investigate the facial symmetry of rats submitted to experimental mandibular condyle fracture and with protein undernutrition (8% of protein) by means of cephalometric measurements. METHODS: Forty-five adult Wistar rats were distributed in three groups: fracture group, submitted to condylar fracture with no changes in diet; undernourished fracture group, submitted to hypoproteic diet and condylar fracture; undernourished group, kept until the end of experiment, without condylar fracture. Displaced fractures of the right condyle were induced under general anesthesia. The specimens were submitted to axial radiographic incidence, and cephalometric mensurations were made using a computer system. The values obtained were subjected to statistical analyses among the groups and between the sides in each group. RESULTS: There was significative decrease of the values of serum proteins and albumin in the undernourished fracture group. There was deviation of the median line of the mandible relative to the median line of the maxilla, significative to undernutrition fracture group, as well as asymmetry of the maxilla and mandible, in special in the final period of experiment. CONCLUSION: The mandibular condyle fracture in rats with proteic undernutrition induced an asymmetry of the mandible, also leading to consequences in the maxilla.

Comparison of speed and precision of manual viz a viz computer assisted cephalometric measurements

2015 ◽  
Vol 29 (1) ◽  
pp. 11-20
Author(s):  
Gagan D. Kochar ◽  
Balakrishna Jayan ◽  
Sukhbir S. Chopra ◽  
Munish Verma ◽  
Abhijeet Kadu ◽  
...  
Keyword(s):  
Computer Assisted ◽  
Cephalometric Measurements

scholarly journals The Value of Lateral Cephalometric Variables Measured by Cephalogram in Sex Determining among Iranians

2016 ◽  
Vol 9 (6) ◽  
pp. 214
Author(s):  
Naimeh Farhidnia ◽  
Siamak Soltani ◽  
Kamran Aghakhani ◽  
Sasan Salehi ◽  
Leila Khloosy ◽  
...  
Keyword(s):  
Cranial Base ◽  
Personal Identification ◽  
Effective Length ◽  
Cross Sectional ◽  
Male And Female ◽  
Gonial Angle ◽  
Anterior Nasal Spine ◽  
Specificity And Sensitivity ◽  
Lateral Cephalograms ◽  
Cephalometric Measurements

PURPOSE: Sex determination is one of the most important aspects of the personal identification in forensic medicine. The present study thus aimed to assess the value of cephalogram in determining sex by applying eleven linear and an angular cephalometric variables measured on lateral cephalograms among Iranians.METHODS: In a cross-sectional study, 11 linear and 1 angular cephalometric measurements were studied. Those are: basion to anterior nasal spine, upper facial height, length of cranial base, total face height, frontal sinus height, mastoidale to sella-nasion plan, mastoidale to porion-orbital plan, mastoid height from cranial base, mastoid with at the level of cranial base, mandibular effective length (central condyle to prognation), occipitofrontal diameter, and gonial angle. Measurements were assessed in 150 individuals (75 males and 75 females) aged 25 to 54 years. After preparing lateral cephalograms, the cephalometric measurements were analyzed using PACS software. SPSS version 22.0 was used for analysis. P values of 0.05 or less were considered statistically significant.RESULTS: With the exception of gonial angle, comparison of lateral cephalometric indices between two sexs showed greater values in males than in females (p<0.001). In general, almost all of the cephalometric measurements were found reliable to distinguish between male and female sex skulls with a high sensitivity (100%) and specificity (97.3% to 1000%).CONCLUSION: The cephalometric measurements used in this study are able to differentiate with high specificity and sensitivity between male and female skull

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