Sexual dimorphism of mandibular measures from computed tomographies

ABSTRACT Objetive: The objective of this study was to analyze mandibular measurements obtained from 225 computed tomography scans of the Osteological and CT Biobanks of Faculdade de Odontologia de Piracicaba Universidade Estadual de Campinas, aiming to verify the existence of a relationship between these measures and sexual dimorphism and ancestry. Methods: We sought to establish a mathematical model capable of estimating sex and ancestry. Of these scans, 126 were male, 94 were female and 5 were unidentified, aged 15 to 100 years, and ancestry known for the skin color phenotype (white, black, brown and yellow). Measurements were made between the following points: right lateral condylion and left lateral condylion; right lateral condylion and pogonion; left lateral condylion and pogonion; mesial border of right mental foramen and mesial border of left mental foramen. The area delimited by the triangle formed by the measurements between right lateral condylion and left lateral condylion was also analyzed; right lateral condylion and pogonion; and left lateral condylion and pogonion. Student t test for homogeneous variances showed that there was statistical difference in the means as a function of sex, except for the area measure, which was not used in the model. Results: It was possible to establish a mathematical model with accuracy of 69.2%. There was no statistical difference in the averages as a function of ancestry. Conclusion: It is concluded that the measures investigated help in the process of estimating sex, but were not adequate to estimate ancestry. The proposed methodology should be expanded to other population groups so that it can be improved.

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Age-related Change of the Dimensions of the Cricoid Cartilage in Adults

Annals of Otology Rhinology & Laryngology ◽

10.1177/0003489420940339 ◽

2020 ◽

pp. 000348942094033

Author(s):

Shiqing Liu ◽

Lili Cheng ◽

Wenxu Qi ◽

Xin Zhang ◽

Youjing Dong

Keyword(s):

Computed Tomography ◽

Sexual Dimorphism ◽

Sagittal Plane ◽

Cricoid Cartilage ◽

Adult Population ◽

Multiplanar Reconstruction ◽

Anteroposterior Diameter ◽

Age Related ◽

Computed Tomography Scans ◽

The Mean

Objectives: To measure the dimensions of the cricoid cartilage in adults and to investigate the age-related change of the dimensions of the cricoid cartilage. Methods: After performing the multiplanar reconstruction and correcting the slant of the cervical computed tomography scans, the transverse and anteroposterior internal diameters of the inlet (TD-in and APD-in) and outlet (TD-out and APD-out) of the cricoid cartilage were measured, respectively. The angle between the arch and lamina of the cricoid cartilage in the middle sagittal plane was measured. The ratios of transverse to anteroposterior diameter for the inlet (Ratio-in) and outlet (Ratio-out) of the cricoid cartilage were calculated, respectively. Results: A total of 1200 adults were included in this study, with 600 males and 600 females. The TD-in is the smallest cricoid diameter and the APD-in is the largest cricoid diameter. The mean cricoid diameters and the cricoid angle in males were larger than those in females. The cricoid inlet is oval shaped and the cricoid cartilage is “funnel-shaped” in the middle sagittal plane. The shape of the outlet of the cricoid cartilage varies greatly among individuals. In males, the APD-in and APD-out were negatively correlated with age while the Ratio-in and Ratio-out was positively correlated with age. In females, the APD-out were negatively correlated with age while the Ratio-out was negatively correlated with age. Conclusions: The dimensions of the cricoid cartilage change as age advances in adult population and the sexual dimorphism of the cricoid outlet occurs after 50 years old.

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Sexual dimorphism of mental foramen position in peruvian subjects: A cone-beam-computed tomography study

Indian Journal of Dental Research ◽

10.4103/ijdr.ijdr_557_18 ◽

2020 ◽

Vol 31 (1) ◽

pp. 103

Author(s):

MariaEugenia Guerrero ◽

YalilAugusto Rodríguez-Cárdenas ◽

Manuel Casas-Campana ◽

LuisErnesto Arriola-Guillén ◽

AronAliaga-Del Castillo ◽

...

Keyword(s):

Computed Tomography ◽

Sexual Dimorphism ◽

Cone Beam Computed Tomography ◽

Mental Foramen ◽

Cone Beam

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Evaluation of the location of mental foramen by Cone-Beam computed tomography for patients visiting dental clinics at Qassim University.

International Journal of Medicine in Developing Countries ◽

10.24911/ijmdc.51-1608148826 ◽

2021 ◽

pp. 1

Author(s):

Abdulsalam Alharbi ◽

Hatim Almutairi ◽

Abdulmajeed Albishri ◽

Shaul Kolarkodi

Keyword(s):

Computed Tomography ◽

Cone Beam Computed Tomography ◽

Mental Foramen ◽

Cone Beam ◽

Dental Clinics

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Faculty Opinions recommendation of Cancer risk in 680,000 people exposed to computed tomography scans in childhood or adolescence: data linkage study of 11 million Australians.

Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature ◽

10.3410/f.718023711.793479508 ◽

2013 ◽

Author(s):

Michael Brodsky ◽

Paula Grigorian

Keyword(s):

Computed Tomography ◽

Cancer Risk ◽

Data Linkage ◽

Linkage Study ◽

Computed Tomography Scans

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Deep Learning based Staging of Bone Lesions from Computed Tomography Scans (January 2021)

IEEE Access ◽

10.1109/access.2021.3074051 ◽

2021 ◽

pp. 1-1

Author(s):

Samira Masoudi ◽

Sherif Mehralivand ◽

Stephanie A. Harmon ◽

Nathan Lay ◽

Liza Lindenberg ◽

...

Keyword(s):

Computed Tomography ◽

Deep Learning ◽

Bone Lesions ◽

Computed Tomography Scans

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Utility of Head Computed Tomography Scans Prior to Outpatient Follow-up for Low-Risk Mild Traumatic Brain Injury

World Neurosurgery ◽

10.1016/j.wneu.2021.04.087 ◽

2021 ◽

Author(s):

Matthew W. Weber ◽

Jeffrey Z. Nie ◽

Victoria L. Watson ◽

Nathan J. Nordmann ◽

Joseph Bernard ◽

...

Keyword(s):

Computed Tomography ◽

Traumatic Brain Injury ◽

Brain Injury ◽

Mild Traumatic Brain Injury ◽

Low Risk ◽

Computed Tomography Scans ◽

Head Computed Tomography

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Correlation between tympanometry volume and three-dimensional computed tomography mastoid volumetry in tympanoplasty candidates

The Journal of Laryngology & Otology ◽

10.1017/s002221512100164x ◽

2021 ◽

pp. 1-5

Author(s):

L Epprecht ◽

L Qingsong ◽

N Stenz ◽

S Hashimi ◽

T Linder

Keyword(s):

Computed Tomography ◽

Tympanic Membrane ◽

Cell Volume ◽

Radiation Injury ◽

Three Dimensional ◽

Non Invasive ◽

Tympanic Membrane Perforations ◽

Computed Tomography Scans ◽

Air Cells ◽

Mastoid Air Cells

Abstract Objective Ventilation of the middle ear and mastoid air cells is believed to play an important role in the pathogenesis of chronic ear disease. Traditionally, ventilation is assessed by computed tomography. However, this exposes patients to cumulative radiation injury. In cases with a perforation in the tympanic membrane, tympanometry potentially presents a non-invasive alternative to measure the ventilated middle-ear and mastoid air cell volume. This study hypothesised that total tympanometry volume correlates with ventilated middle-ear and mastoid air cell volume. Method Total tympanometry volume was compared with ventilated middle-ear and mastoid air cell volume on computed tomography scans in 20 tympanic membrane perforations. Results There was a high correlation between tympanometry and computed tomography volumes (r = 0.78; p < 0.001). A tympanometry volume more than 2 ml predicted good ventilation on computed tomography. Conclusion These results may help reduce the need for pre-operative computed tomography in uncomplicated cases with tympanic membrane perforations.

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Three-dimensional assessment of the anterior and inferior loop of the inferior alveolar nerve using computed tomography images in patients with and without mandibular asymmetry

BMC Oral Health ◽

10.1186/s12903-021-01424-3 ◽

2021 ◽

Vol 21 (1) ◽

Author(s):

Jae-Young Kim ◽

Michael D. Han ◽

Kug Jin Jeon ◽

Jong-Ki Huh ◽

Kwang-Ho Park

Keyword(s):

Computed Tomography ◽

Symmetry Group ◽

Three Dimensional ◽

Inferior Alveolar Nerve ◽

Mental Foramen ◽

3D Analysis ◽

Mandibular Asymmetry ◽

Computed Tomography Images ◽

Significant Difference ◽

Mandibular Body

Abstract Background The purpose of this study was to investigate the differences in configuration and dimensions of the anterior loop of the inferior alveolar nerve (ALIAN) in patients with and without mandibular asymmetry. Method Preoperative computed tomography images of patients who had undergone orthognathic surgery from January 2016 to December 2018 at a single institution were analyzed. Subjects were classified into two groups as “Asymmetry group” and “Symmetry group”. The distance from the most anterior and most inferior points of the ALIAN (IANant and IANinf) to the vertical and horizontal reference planes were measured (dAnt and dInf). The distance from IANant and IANinf to the mental foramen were also calculated (dAnt_MF and dInf_MF). The length of the mandibular body and symphysis area were measured. All measurements were analyzed using 3D analysis software. Results There were 57 total eligible subjects. In the Asymmetry group, dAnt and dAnt_MF on the non-deviated side were significantly longer than the deviated side (p < 0.001). dInf_MF on the non-deviated side was also significantly longer than the deviated side (p = 0.001). Mandibular body length was significantly longer on the non-deviated side (p < 0.001). There was no significant difference in length in the symphysis area (p = 0.623). In the Symmetry group, there was no difference between the left and right sides for all variables. Conclusion In asymmetric patients, there is a difference tendency in the ALIAN between the deviated and non-deviated sides. In patients with mandibular asymmetry, this should be considered during surgery in the anterior mandible.

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