Accuracy of mandibular measurements of sexual dimorphism using stabilizer equipment

Lopez, Thais Torralbo; Crosato, Edgard Michel; Benedicto, Eduardo de Novaes; Paiva, Luiz Airton Saavedra de; Silva, Diogo Cesar Borges; Biazevic, María Gabriela Haye

doi:10.1590/1807-3107bor-2017.vol31.0001

Cited by 18 publications

(19 citation statements)

References 20 publications

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“…Similarly a Brazilian study from 2013 reported that the IGB ranged from 93.7 ± 6.8 mm to 94.5 ± 9.1 mm [79]. More recently Lopez et al (2017) reported an IGB of 91.8 ± 5.9 mm for males and 84.5 ± 5.0 mm for females [57]. Ozturk et al (2013) published an IGB of 85.86 mm [60].…”

Section: Discussionmentioning

confidence: 99%

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Cephalometric studies of the mandible, its masticatory muscles and vasculature of growing Göttingen Minipigs—A comparative anatomical study to refine experimental mandibular surgery

et al. 2019

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Over many decades, the Göttingen Minipig has been used as a large animal model in experimental surgical research of the mandible. Recently several authors have raised concerns over the use of the Göttingen Minipig in this research area, observing problems with post-operative wound healing and loosening implants. To reduce these complications during and after surgery and to improve animal welfare in mandibular surgery research, the present study elucidated how comparable the mandible of minipigs is to that of humans and whether these complications could be caused by specific anatomical characteristics of the minipigs’ mandible, its masticatory muscles and associated vasculature. Twenty-two mandibular cephalometric parameters were measured on CT scans of Göttingen Minipigs aged between 12 and 21 months. Ultimately, we compared this data with human data reported in the scientific literature. In addition, image segmentation was used to determine the masticatory muscle morphology and the configuration of the mandibular blood vessels. Compared to data of humans, significant differences in the mandibular anatomy of minipigs were found. Of the 22 parameters measured only four were found to be highly comparable, whilst the others were not. The 3D examinations of the minipigs vasculature showed a very prominent deep facial vein directly medial to the mandibular ramus and potentially interfering with the sectional plane of mandibular distraction osteogenesis. Damage to this vessel could result in inaccessible bleeding. The findings of this study suggest that Göttingen Minipigs are not ideal animal models for experimental mandibular surgery research. Nevertheless if these minipigs are used the authors recommend that radiographic techniques, such as computed tomography, be used in the specific planning procedures for the mandibular surgical experiments. In addition, it is advisable to choose suitable age groups and customize implants based on the mandibular dimensions reported in this study.

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Section: Discussionmentioning

confidence: 99%

“…MRH: Compared to the published values of humans, Göttingen Minipigs have a significantly higher mandibular ramus [57–60].…”

Section: Discussionmentioning

confidence: 99%

Cephalometric studies of the mandible, its masticatory muscles and vasculature of growing Göttingen Minipigs—A comparative anatomical study to refine experimental mandibular surgery

et al. 2019

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“…[ Table 1 here] The mandibles were positioned using a mandible stabilizer. The device was developed to stabilize a mandible with the mandibular plane aligned in relation to the ground [34]. The equipment has a base, a fixation, a positioning table, and a measurement table.…”

Section: Methodsmentioning

confidence: 99%

Discriminant analysis of mandibular measurements for the estimation of sex in a modern Brazilian sample

et al. 2017

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The present study aimed to evaluate the accuracy of mandibular measurements for sex determination in a Brazilian population. The sample was composed of 100 mandibles, of which 53 were female and 47 were male, and the average age was 57.03 years. The mandible measurement protocol was composed of 15 measurements, of which six were bilateral and nine were unique. Mandibles were directly measured using a digital caliper and a protractor. The descriptive analysis of the present study revealed higher mean values for male mandibles compared to those for female mandibles with the exception of the left mandibular angle. Among the 21 measures analyzed in this group, 15 were statistically significant (p < 0.05). Univariate discriminant analyses produced a mean percentage of correct predictions that varied between 49 and 79%. The association of variables increased the percentage of correct prediction of sex to vary from 76 to 86%. The receiver operator characteristic (ROC) curve analysis indicated that the best variable for estimating sex was bigonial breadth (BGB; area under the ROC curve (AUC) = 0.764) followed by the right maximum ramus height (MRHr; AUC = 0.763). A reference table for estimating sex in a Brazilian population using mandible measurements was developed based on the ROC curve analysis. Mandibular measures provide a simple and reliable method for sex discrimination in Brazilian adults due to the sexual dimorphism revealed by analysis of the metric variables and the satisfactory results demonstrated by discriminant formulas, ROC curve analysis, and the reference table.

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“…Depending on where exactly on the rugosity the calipers were placed, and because the clavicle is a small bone, the measurement variances may lead to discrepancies in reliability with the inter‐observer error rates. To enhance the familiarity of a user with these measurements, and thus increase their accuracy in sex estimation, training with theoretical discussions and practical activities is recommended prior to application (Lopez et al, ).…”

Section: Discussionmentioning

confidence: 99%

The influence of biological affinity and sex on morphometric parameters of the clavicle in a South African sample

Scott

Peckmann

Alblas

2018

American J Hum Biol

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Accuracy of mandibular measurements of sexual dimorphism using stabilizer equipment

Cited by 18 publications

References 20 publications

Cephalometric studies of the mandible, its masticatory muscles and vasculature of growing Göttingen Minipigs—A comparative anatomical study to refine experimental mandibular surgery

Cephalometric studies of the mandible, its masticatory muscles and vasculature of growing Göttingen Minipigs—A comparative anatomical study to refine experimental mandibular surgery

Discriminant analysis of mandibular measurements for the estimation of sex in a modern Brazilian sample

The influence of biological affinity and sex on morphometric parameters of the clavicle in a South African sample

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