Towards an early 3D-diagnosis of craniofacial asymmetry by computing the accurate midplane: A PCA-based method

Ortún‐Terrazas, Javier; Fagan, Michael J.; Cegoñino, José; Illipronti-Filho, Edson; Palomar, Amaya Pérez del

doi:10.1016/j.cmpb.2020.105397

Cited by 13 publications

(21 citation statements)

References 72 publications

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“…Furthermore, a few recent CBCT studies have shown three-dimensional asymmetrical alterations of the temporomandibular joints in unilateral posterior crossbite patients [ 10 , 36 , 37 , 38 , 39 , 40 ]. Even though these studies are very interesting, because they provide a more direct confirmation of the morphological alterations of mandibular condyles in unilateral posterior crossbite patients, the routine use of CBCT imaging on children should be viewed with caution.…”

Section: Discussionmentioning

confidence: 99%

Condylar Asymmetry in Children with Unilateral Posterior Crossbite Malocclusion: A Comparative Cross-Sectional Study

et al. 2022

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Unilateral posterior crossbite (UXB) is a common, severely asymmetric malocclusion, characterized by maxillary hypoplasia and masticatory dysfunction. The aim of this research is to evaluate the asymmetry of mandibular condyles and rami in children with UXB. This comparative cross-sectional study included 33 children with UXB (girls = 15, boys = 18; mean age ± SD = 8.0 ± 1.3 years.months]) and 33 age- and gender-matched controls (girls = 15, boys = 18; mean age ± SD = 8.4 ± 1.3 years.months]). Pre-treatment OPGs were analyzed by comparing the height of condyles and rami between the sides using the method by Habets et al. (1988); the result was considered significant if the degree of asymmetry was >6%. Children with UXB showed a significantly increased asymmetry of mandibular condyles (mean ± SD = 10.7% ± 9, p < 0.001), but not of rami (mean ± SD = 1.9% ± 2.3), compared to controls. The rami did not show significant asymmetry in either group. The presence of an increased condylar asymmetry index in a developing patient with unilateral posterior crossbite is a sign of altered skeletal growth and should be considered in the diagnostic process and treatment plan.

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Section: Discussionmentioning

confidence: 99%

Condylar Asymmetry in Children with Unilateral Posterior Crossbite Malocclusion: A Comparative Cross-Sectional Study

et al. 2022

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“…However, a large number of studies have shown that the skull is not perfectly symmetrical, and this method can not be applied to cross the midline, and bilateral defects. [10][11][12][13][14][15] Another commonly used method is the SSM. 16 Its primary method is to obtain a set of bone shapes from the face of normal people and then use principal component analysis (PCA) to construct SSM for these shapes.…”

Section: Traditional Methodsmentioning

confidence: 99%

“…One of the most classic is the mirror technique, 9 whose primary method is to find the median sagittal plane and map the normal skull to the defective skull. However, a large number of studies have shown that the skull is not perfectly symmetrical, and this method can not be applied to cross the midline, and bilateral defects 10–15 . Another commonly used method is the SSM 16 .…”

Section: Related Workmentioning

confidence: 99%

“…Second, it is impossible to quantitatively evaluate the postoperative effect without a comparative analysis of index data before and after an operation. Many traditional methods have been used for the reconstruction of intraoperative bone defects, such as mirror imaging mapping, [9][10][11][12][13][14][15] statistical shape model (SSM), 16,17 deformable template, 18,19 and so forth. These methods have their advantages and disadvantages, but they are only applicable to some types of defects and can not be extended to all craniomaxillofacial defects.…”

Section: Introductionmentioning

confidence: 99%

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An intelligent system for craniomaxillofacial defecting reconstruction

Xiong

Guo

et al. 2022

Int J of Intelligent Sys

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Craniomaxillofacial defects caused by congenital or acquired reasons seriously affect patients' physical and mental health. How to accurately and objectively repair the morphology of craniomaxillofacial tissues and organs through surgery is a difficult problem, and the preoperative virtual design is crucial. Traditional preoperative virtual design methods include mirror technology, statistical shape model, and deformable template. However, these methods are complex, time-consuming, and only applicable to some types of defects. Therefore, a general, intelligent, and personalized craniomaxillofacial defect virtual reconstruction system is desired. To solve this problem, a novel deep learning method, RecGAN, is proposed in this paper. RecGAN can learn the bone morphology of normal people, repair the defect intelligently based on the patient's remaining bone, and fully adapt to the special conditions of different patients. Currently, there are no open-source maxillofacial data sets available. Thus, a new maxillofacial computed tomography image data set with 500 simulated cases and 100 clinical cases is constructed to train and validate the method. The experimental results show that RecGAN can effectively restore the normal bone and tissue morphology of the patient's craniomaxillofacial defect area, solve the problem that there is no objective repair method for craniomaxillofacial defect, and achieve the

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“…Besides, the use of 3D FE models from CT or CBCT images is limited during childhood due to the low grey gradient between unmineralized structures at these ages. This fact makes difficult the segmentation procedure, requiring intensive manual work (Ort un-Terrazas et al 2020). As an alternative, panoramic radiographs or 2D-cephalograms in frontal, lateral, and submentovertex views are currently used to evaluate the morphological differences between both joints during childhood.…”

Section: Introductionmentioning

confidence: 99%

Analysis of temporomandibular joint dysfunction in paediatric patients with unilateral crossbite using automatically generated finite element models

Ortún‐Terrazas

Cegoñino

Illipronti-Filho

et al. 2020

Computer Methods in Biomechanics and Biomedical Engineering

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Towards an early 3D-diagnosis of craniofacial asymmetry by computing the accurate midplane: A PCA-based method

Cited by 13 publications

References 72 publications

Condylar Asymmetry in Children with Unilateral Posterior Crossbite Malocclusion: A Comparative Cross-Sectional Study

Condylar Asymmetry in Children with Unilateral Posterior Crossbite Malocclusion: A Comparative Cross-Sectional Study

An intelligent system for craniomaxillofacial defecting reconstruction

Analysis of temporomandibular joint dysfunction in paediatric patients with unilateral crossbite using automatically generated finite element models

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