Evaluation of natural mandibular shape asymmetry: an approach by using elliptical Fourier analysis

Niño-Sandoval, Tania Camila; Ariza, Carlos F Morantes; Infante-Contreras, Clementina; Vasconcelos, Belmiro Cavalcanti do Egito

doi:10.1259/dmfr.20170345

Cited by 9 publications

(3 citation statements)

References 16 publications

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“…A further limitation of this study is that by design, this method is limited to two-dimensional shape prediction based on two-dimensional radiographic imaging, whereas the mandible is a complex three-dimensional object [ 12 ]. Transverse measurements such as bigonial width or any asymmetries [ 13 ] could not be assessed using this methodology. Three-dimensional imaging with further landmarks, measurements and volumetric data would be required in order to assess more complex differences in shape, size and position.…”

Section: Discussionmentioning

confidence: 99%

Mandibular shape prediction using cephalometric analysis: applications in craniofacial analysis, forensic anthropology and archaeological reconstruction

Omran

Wertheim

Smith

et al. 2020

Maxillofac Plast Reconstr Surg

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Background The human mandible is variable in shape, size and position and any deviation from normal can affect the facial appearance and dental occlusion. Objectives The objectives of this study were to determine whether the Sassouni cephalometric analysis could help predict two-dimensional mandibular shape in humans using cephalometric planes and landmarks. Materials and methods A retrospective computerised analysis of 100 lateral cephalometric radiographs taken at Kingston Hospital Orthodontic Department was carried out. Results Results showed that the Euclidean straight-line mean difference between the estimated position of gonion and traced position of gonion was 7.89 mm and the Euclidean straight-line mean difference between the estimated position of pogonion and the traced position of pogonion was 11.15 mm. The length of the anterior cranial base as measured by sella-nasion was positively correlated with the length of the mandibular body gonion-menton, r = 0.381 and regression analysis showed the length of the anterior cranial base sella-nasion could be predictive of the length of the mandibular body gonion-menton by the equation 22.65 + 0.5426x, where x = length of the anterior cranial base (SN). There was a significant association with convex shaped palates and oblique shaped mandibles, p = 0.0004. Conclusions The method described in this study can be used to help estimate the position of cephalometric points gonion and pogonion and thereby sagittal mandibular length. This method is more accurate in skeletal class I cases and therefore has potential applications in craniofacial anthropology and the ‘missing mandible’ problem in forensic and archaeological reconstruction.

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Section: Discussionmentioning

confidence: 99%

Mandibular shape prediction using cephalometric analysis: applications in craniofacial analysis, forensic anthropology and archaeological reconstruction

Omran

Wertheim

Smith

et al. 2020

Maxillofac Plast Reconstr Surg

View full text Add to dashboard Cite

show abstract

“…[ 4 6 7 8 9 ] Furthermore, condylar asymmetries are believed to be among the most potent causes of mandibulofacial asymmetries. [ 10 11 12 ] Studies have shown that if asymmetries are not treated in growing patients, mandibular displacement can change the amount and severity of force applied to both the mandible and TMJ. [ 13 14 ]…”

Section: Introductionmentioning

confidence: 99%

Correlations between mandibular asymmetries and temporomandibular disorders: A systematic review

Alqhtani

Al‐Shammery

Alotaibi

et al. 2021

J Int Soc Prevent Communit Dent

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A BSTRACT Objective: This systematic review aimed to investigate the correlation between mandibular asymmetry and temporomandibular disorders (TMDs). Materials and Methods: A systematic search of the published literature was performed in electronic databases such as PubMed (MEDLINE), Scopus, Web of Science, Cochrane, Google Scholar, Clinicaltrials.gov, and Saudi Digital Library. Gray literature was searched through System for Information on Grey Literature through OpenGrey. The Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) statement was followed in the investigation. The focussed question according to PICO format was: “does the mandibular asymmetry contribute to temporomandibular disorders”? Eligibility criteria included clinical trials (CTs), observation studies, cross-sectional and cohort studies in English that investigated mandibular asymmetries and TMD among patients. Blind and duplicate study selection, data extraction, and risk of bias assessment were carried out. Results: The initial search resulted in 1906 articles, of which 11 (8 CTs, 1 cross-sectional, 1 retrospective, and 1 observational) studies were selected for qualitative synthesis after fulfilling the eligibility criteria. Conclusion: Most of the studies included in this review showed either very high risk or high risk of bias. Despite the low certainty of evidence, the current study indicated a likely relationship between mandibular asymmetries and TMDs.

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“…In such cases, the exact morphology of the normal mandible before disease is often difficult to obtain because the mandible is already deformed when the doctor first examines it. Additionally, the human mandible has strong specificity, and its morphology varies between individuals [5][6][7][8][9] , making it impossible to use a universal mandibular model as a reference for surgery 10 and increasing the uncertainty of the surgical effect.…”

Section: Introductionmentioning

confidence: 99%

Recovering Mandibular Morphology after Disease with Artificial Intelligence

Liang

Huan

et al. 2020

Preprint

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Mandibular tumors and radical oral cancer surgery often cause bone dysmorphia and defects. Most patients present with noticeable mandibular deformations, and doctors often have difficulty determining their exact mandibular morphology. In this study, a deep convolutional generative adversarial network (DCGAN) called CTGAN is proposed to complete 3D mandibular cone beam computed tomography (CBCT) data from CT data. After extensive training CTGAN was tested on 6 mandibular tumor cases, resulting in 3D virtual mandibular completion. We found that CTGAN can generate mandibles with different levels and rich morphology, including positional and angular changes and local patterns. The completion results are shown as tomographic images combining generated and natural areas. The 3D generated mandibles have the anatomical morphology of the real mandibles and transition smoothly to the portions without disease, showing that CTGAN constructs mandibles with the expected patient characteristics and is suitable for mandibular morphological completion. The presented modeling principles can be applied to other areas for 3D morphological completion from medical images.

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Evaluation of natural mandibular shape asymmetry: an approach by using elliptical Fourier analysis

Abstract: The mandibular asymmetry by shape is present in all patients and should not be articulated exclusively to pathological processes, therefore, along with sexual dimorphism and differences between skeletal classes must be taken into account for improving mandibular prediction systems.

Cited by 9 publications

References 16 publications

Mandibular shape prediction using cephalometric analysis: applications in craniofacial analysis, forensic anthropology and archaeological reconstruction

Mandibular shape prediction using cephalometric analysis: applications in craniofacial analysis, forensic anthropology and archaeological reconstruction

Correlations between mandibular asymmetries and temporomandibular disorders: A systematic review

Recovering Mandibular Morphology after Disease with Artificial Intelligence

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