Mandibular and glenoid fossa changes after bone-anchored maxillary protraction therapy in patients with UCLP: A 3-D preliminary assessment

Yatabe, Marília; Garib, Daniela Gamba; Faco, Renato André de Souza; Clerck, Hugo De; Souki, Bernardo Quiroga; Janson, Guilherme; Nguyen, Tung; Cevidanes, Lúcia Helena Soares; Ruellas, Antônio Carlos de Oliveira

doi:10.2319/052516-419.1

Cited by 30 publications

(29 citation statements)

References 21 publications

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“…ICP does not distinguish between vertical and AP displacement nor does it record displacement of analogous landmarks. This study utilizes the methods described by Yatabe et al . to measure 3D displacements between analogous points and the x, y and z components of these 3D distances.…”

Section: Discussionmentioning

confidence: 99%

Zygomaticomaxillary suture maturation: Part II—The influence of sutural maturation on the response to maxillary protraction

Angelieri

Ruellas

Yatabe

et al. 2017

Orthod Craniofacial Res

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Structured Abstract Objective To evaluate the influence of the maturational stages of zygomaticomaxillary sutures (ZMS) on the response to maxillary protraction. Subjects and Methods A total of 40 Class III patients were treated retrospectively with either a combination of rapid maxillary expansion and facial mask (RME/FM) or bone-anchored maxillary protraction (BAMP). The RME/FM group consisted of 18 patients (mean age 8.3 years), while the BAMP group was comprised of 22 patients (mean age 11.8 years). The initial CBCT images (T1) of the ZMSs were classified blindly. 3D models from CBCT images at the start and at the end of orthopaedic treatment were registered on the anterior cranial base, and corresponding structures were measured on colour-coded maps and semitransparent overlays. The amounts of protraction of the maxilla, zygoma, orbitale and maxillary first molars for both groups were analysed with two-way ANOVA with Holm-Sidak post hoc test for multiple comparisons. Results A significant association was found between the early maturation stages of the ZMSs and the amount of maxillary protraction, regardless of the protraction method used. Class III patients with ZMS stages A and B showed greater maxillary protraction than patients at stage C. Conclusion The maturational stages of ZMS are associated with the response maxillary protraction.

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Section: Discussionmentioning

confidence: 99%

Zygomaticomaxillary suture maturation: Part II—The influence of sutural maturation on the response to maxillary protraction

Angelieri

Ruellas

Yatabe

et al. 2017

Orthod Craniofacial Res

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“…8 Finally, Bollard plates have been used effectively in severe skeletal malocclusions, though the magnitude and location of the skeletal effect is quite variable. 9,11 Some patients demonstrate greater maxillary protraction, whereas other patients experience greater mandibular retrusion even when treated at the same developmental stage and with the same treatment protocol. A surgery-first approach has been purported to be more efficient by performing the surgery either first or very early in the combined treatment approach rather than at the midpoint of the combined treatment approach.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional treatment planning for maxillary and mandibular segmental surgery for an adult Class III: Where old meets new

Conley

Edwards

2018

The Angle Orthodontist

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Class III open bite malocclusion can be among the most difficult case types to obtain an excellent occlusal, skeletal, and facial outcome. Treatment options include growth modification, extraction for orthodontic camouflage, and orthognathic surgery. For the most severely affected and non-growing patients, orthognathic surgery is often the most predictable and, in some situations, the only viable way of achieving an optimal result. The risks and benefits of surgical treatment options can occasionally be difficult to assess particularly for providers with limited experience. Two-dimensional surgical predictions can assist but do not permit the third dimension to be visualized. New techniques of computer-aided surgical simulation can enable the surgeon, orthodontist, and patient to better visualize and understand the treatment approach and enable them to make the most effective and efficient treatment related decisions. This case merges knowledge of the full spectrum of historical surgical techniques with the new approach of computer-aided surgical simulation (CASS) to perform complex segmental maxillary and mandibular surgery to obtain an excellent functional and esthetic result.

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confidence: 99%

“…Segmentation accuracy of the proposed automated method is assessed by comparing outcomes with a well-accepted interactive segmentation method described in the literature. 1,2 Methods and materials Image data CBCT images were obtained from 21 adolescent subjects with a mean age of 13.68 years (SD:1.27; 9 males) from an orthodontic clinic, where images had previously been obtained for clinical indications. Images were taken using an i-Cat machine (Imaging Sciences International, PA, USA) with a 16 × 22cm field of view and an isotropic voxel size of 0.5mm.…”

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confidence: 99%

“…The segmentation accuracy of the proposed method was assessed through the comparison to a well-accepted interactive segmentation method described in previous studies. 1,2 This method was performed with open-source software ITK-SNAP (http://www.itksnap.org/pmwiki/pmwiki.php) by an experienced orthodontist (Hidden Content) and checked by a dentist (Hidden Content). Firstly, thresholding was used to grossly generate the main part of the mandible.…”

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Marker-based watershed transform method for fully automatic mandibular segmentation from low-dose CBCT images

Fan

Beare

Matthews

et al. 2018

Preprint

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IntroductionThree-dimensional mandibular models are useful for planning maxillofacial surgery and orthodontic treatment. 1,2 In studies of growth, mandibular models are important for assessing morphological changes over time. 3,4 Such models are typically obtained from conventional computed tomography (CT), using high radiation dose to capture fine detail of the bony structure. Cone beam computed tomography (CBCT) shows promise for oral and craniofacial imaging applications due to lower radiation dose, lower cost and shorter acquisition time compared to CT. However, CBCT images have lower contrast and higher levels of noise than conventional CT, making mandible segmentation a challenging task. 5 Segmenting a 3D mandible is typically done 'interactively' in computer software on a case by case basis. Threshold-based algorithms or morphological operations are commonly used first for the separation of bony structures from soft tissues.6-8 Then manual work is needed to separate the mandible from the cranial base and the maxilla because the algorithms cannot distinguish between different facial bones with similar intensity values. We refer to this combination of computerized operations and manual editing as 'interactive' segmentation. Specific issues in mandible segmentation include intercuspation occlusion and low contrast of condyles relative to surrounding structures. Intercuspation leads to connection between upper and lower teeth while low contrast leads to difficult to define boundaries on the condyles. These require slice-by-slice based manual editing, which is tedious, time-consuming and operator-dependent as it produces slightly different outlines after continuous interventions. 6A robust automated mandible segmentation approach is thus desirable. In other applications, simple automated methods based on voxel intensity or edge intensity can be very effective.9,10 However, the mandible is not the only bone structure in CBCT All rights reserved. No reuse allowed without permission.(which was not peer-reviewed) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity.The copyright holder for this preprint . http://dx.doi.org/10.1101/397166 doi: bioRxiv preprint first posted online Aug. 21, 2018; images of the head, and the intensity of bone varies considerably. More sophisticated methods which incorporate prior information about the expected shapes and position of objects to be segmented are required. To date only four publications, using statistical shape models, 11,12 multi-atlas label registration 13 or machine learning, 14 have been proposed to automate the mandibular segmentation from CBCT images. These approaches are either computationally expensive or require collection of large amounts of manually segmented mandibles as training data, which may be impractical in clinical situations.The watershed method is a classic, computationally simple technique for object segmentation in images. The original grayscale image can be regarded as a topographic relief, with brightne...

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Mandibular and glenoid fossa changes after bone-anchored maxillary protraction therapy in patients with UCLP: A 3-D preliminary assessment

Cited by 30 publications

References 21 publications

Zygomaticomaxillary suture maturation: Part II—The influence of sutural maturation on the response to maxillary protraction

Zygomaticomaxillary suture maturation: Part II—The influence of sutural maturation on the response to maxillary protraction

Three-dimensional treatment planning for maxillary and mandibular segmental surgery for an adult Class III: Where old meets new

Marker-based watershed transform method for fully automatic mandibular segmentation from low-dose CBCT images

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