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https://www.readbyqxmd.com/read/29671153/novel-method-for-superposing-3d-digital-models-for-monitoring-orthodontic-tooth-movement
#1
Falko Schmidt, Fatih Kilic, Neltje Emma Piro, Martin Eberhard Geiger, Bernd Georg Lapatki
Quantitative three-dimensional analysis of orthodontic tooth movement (OTM) is possible by superposition of digital jaw models made at different times during treatment. Conventional methods rely on surface alignment at palatal soft-tissue areas, which is applicable to the maxilla only. We introduce two novel numerical methods applicable to both maxilla and mandible. The OTM from the initial phase of multi-bracket appliance treatment of ten pairs of maxillary models were evaluated and compared with four conventional methods...
April 18, 2018: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/29668300/magnitude-of-cone-beam-computed-tomography-image-artifacts-related-to-zirconium-and-titanium-implants-impact-on-image-quality
#2
Rocharles C Fontenele, Eduarda Hl Nascimento, Taruska V Vasconcelos, Marcel Noujeim, Deborah Q Freitas
OBJECTIVES: To evaluate the magnitude of artifacts related to titanium and zirconium implants at different distances and angulations and their impact on cone beam computed tomography (CBCT) image quality. METHODS: CBCT images were obtained before and after the insertion of titanium and zirconium implants in a mandible on different CBCT units: Picasso Trio, ProMax 3D and 3D Accuitomo 80. Artefact was assessed by measuring the standard deviation of gray values (SD) and contrast-to-noise ratio (CNR) of 11 regions of interest (ROI) at different distances (1...
April 18, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/29611183/maternal-environment-and-craniofacial-growth-geometric-morphometric-analysis-of-mandibular-shape-changes-with-in-utero-thyroxine-overexposure-in-mice
#3
Matthew J Kesterke, Margaret A Judd, Mark P Mooney, Michael I Siegel, Mohammed Elsalanty, R Nicole Howie, Seth M Weinberg, James J Cray
An estimated 3% of US pregnancies are affected by maternal thyroid dysfunction, with between one and three of every 1000 pregnancies being complicated by overactive maternal thyroid levels. Excess thyroid hormones are linked to neurological impairment and excessive craniofacial variation, affecting both endochondral and intramembranous bone. Using a geometric morphometric approach, this study evaluates the role of in utero thyroxine overexposure on the growth of offspring mandibles in a sample of 241 mice. Canonical variate analysis utilized 16 unilateral mandibular landmarks obtained from 3D micro-computed tomography to assess shape changes between unexposed controls (n = 63) and exposed mice (n = 178)...
April 2, 2018: Journal of Anatomy
https://www.readbyqxmd.com/read/29581806/accuracy-of-three-dimensional-planning-in-surgery-first-orthognathic-surgery-planning-versus-outcome
#4
Ngoc Hieu Tran, Syrina Tantidhnazet, Somchart Raocharernporn, Sirichai Kiattavornchareon, Verasak Pairuchvej, Natthamet Wongsirichat
Background: The benefit of computer-assisted planning in orthognathic surgery (OGS) has been extensively documented over the last decade. This study aimed to evaluate the accuracy of three-dimensional (3D) virtual planning in surgery-first OGS. Methods: Fifteen patients with skeletal class III malocclusion who underwent bimaxillary OGS with surgery-first approach were included. A composite skull model was reconstructed using data from cone-beam computed tomography and stereolithography from a scanned dental cast...
May 2018: Journal of Clinical Medicine Research
https://www.readbyqxmd.com/read/29580723/the-performance-of-a-zirconium-based-root-filling-material-with-artifact-reduction-properties-in-the-detection-of-artificially-induced-root-fractures-using-cone-beam-computed-tomographic-imaging
#5
Aaron Fox, Bettina Basrani, Ernest W N Lam
INTRODUCTION: Limited field of view cone-beam computed tomographic (CBCT) imaging has been used to augment clinical testing of vertical root fractures (VRFs); however, the presence of gutta-percha (GP) in the canal space generates substantial imaging artifacts that make fracture detection difficult. The purpose of this study was to evaluate the influence of a zirconium (Zr)-based root filling material with radiologic properties that reduce beam hardening (BH) artifacts using CBCT imaging in the in vitro diagnosis of VRFs...
March 23, 2018: Journal of Endodontics
https://www.readbyqxmd.com/read/29574815/reconstruction-of-major-defects-of-the-jaws
#6
M D Batstone
Prosthetic replacements in the 19th and early 20th century were superseded by pedicled flaps and obturators. These have subsequently been superseded by free tissue transfer which currently is the mainstay of reconstructive jaw surgery. Although malignant and benign processes of the jaws are the predominant cause of segmental defects, a significant proportion still occurs due to trauma, or even iatrogenic causes such as radiotherapy. The varied aetiologies demand a nuanced approach to reconstruction and although the techniques remain similar the timing can be quite different...
March 2018: Australian Dental Journal
https://www.readbyqxmd.com/read/29567343/value-of-pet-ct-3d-visualization-of-head-and-neck-squamous-cell-carcinoma-extended-to-mandible
#7
R Lopez, P Gantet, A Julian, A Hitzel, B Herbault-Barres, S Alshehri, P Payoux
PURPOSE: To study an original 3D visualization of head and neck squamous cell carcinoma extending to the mandible by using [18F]-NaF PET/CT and [18F]-FDG PET/CT imaging along with a new innovative FDG and NaF image analysis using dedicated software. The main interest of the 3D evaluation is to have a better visualization of bone extension in such cancers and that could also avoid unsatisfying surgical treatment later on. PATIENTS AND METHODS: A prospective study was carried out from November 2016 to September 2017...
February 24, 2018: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/29559220/effect-of-simulated-intraoral-variables-on-the-accuracy-of-a-photogrammetric-imaging-technique-for-complete-arch-implant-prostheses
#8
Manuel Bratos, Jumping M Bergin, Jeffrey E Rubenstein, John A Sorensen
STATEMENT OF PROBLEM: Conventional impression techniques to obtain a definitive cast for a complete-arch implant-supported prosthesis are technique-sensitive and time-consuming. Direct optical recording with a camera could offer an alternative to conventional impression making. PURPOSE: The purpose of this in vitro study was to test a novel intraoral image capture protocol to obtain 3-dimensional (3D) implant spatial measurement data under simulated oral conditions of vertical opening and lip retraction...
March 17, 2018: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29542051/quantifying-anatomic-deformations-during-laryngoscopy
#9
Xiaotian Wu, Joseph A Paydarfar, Ryan J Halter
For a variety of head and neck cancers, specifically those of the oropharynx, larynx, and hypopharynx, minimally invasive trans-oral approaches have been developed to reduce perioperative and long-term morbidity. However, in trans-oral surgical approaches anatomical deformation due to instrumentation, specifically placement of laryngoscopes and retractors, present a significant challenge for surgeons relying on preoperative imaging to resect tumors to negative margins. Quantifying the deformation due to instrumentation is needed in order to develop predictive models of operative deformation...
March 14, 2018: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/29531936/novel-condylar-repositioning-method-for-3d-printed-models
#10
Keisuke Sugahara, Yoshiharu Katsumi, Masahide Koyachi, Yu Koyama, Satoru Matsunaga, Kento Odaka, Shinichi Abe, Masayuki Takano, Akira Katakura
Background: Along with the advances in technology of three-dimensional (3D) printer, it became a possible to make more precise patient-specific 3D model in the various fields including oral and maxillofacial surgery. When creating 3D models of the mandible and maxilla, it is easier to make a single unit with a fused temporomandibular joint, though this results in poor operability of the model. However, while models created with a separate mandible and maxilla have operability, it can be difficult to fully restore the position of the condylar after simulation...
December 2018: Maxillofacial Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/29525922/resorptive-potential-of-impacted-mandibular-third-molars-3d-simulation-by-finite-element-analysis
#11
Anne Caroline Oenning, Alexandre Rodrigues Freire, Ana Cláudia Rossi, Felippe Bevilacqua Prado, Paulo Henrique Ferreira Caria, Lourenço Correr-Sobrinho, Francisco Haiter-Neto
OBJECTIVES: Previous studies have suggested a relationship between resorption in second molars and pressure from the eruptive force of the third molar. The aim of this study was to simulate functional forces in a mandible model by means of finite element analysis and then assess the biomechanical response produced by impacted third molars on the roots of the second molar. MATERIALS AND METHODS: A cone beam computed tomography scan presenting an impacted mandibular third molar was segmented (Mimics V17 software)...
March 10, 2018: Clinical Oral Investigations
https://www.readbyqxmd.com/read/29496055/three-dimensional-printing-of-patient-specific-surgical-plates-in-head-and-neck-reconstruction-a-prospective-pilot-study
#12
Wei-Fa Yang, Wing Shan Choi, Yiu Yan Leung, Justin Paul Curtin, Ruxu Du, Chun-Yu Zhang, Xian-Shuai Chen, Yu-Xiong Su
BACKGROUND: Surgical plates have been extensively used in head and neck reconstruction and conventional plates are mass-produced with universal configurations. To overcome disadvantages of conventional surgical plates, we have been exploring patient-specific surgical plates using the three-dimensional (3D) printing technology. We hypothesized that the application of 3D-printed patient-specific surgical plates in head and neck reconstruction is feasible, safe and precise. METHODS: We are conducting a prospective clinical trial to assess the feasibility, safety and accuracy of applying 3D-printed patient-specific surgical plates in head and neck reconstruction...
March 2018: Oral Oncology
https://www.readbyqxmd.com/read/29492172/evaluation-of-dimensional-changes-of-3d-printed-models-after-sterilization-a-pilot-study
#13
Eman Shaheen, Abdulhadi Alhelwani, Elke Van De Casteele, Constantinus Politis, Reinhilde Jacobs
Objectives: To assess the effect of two of the most commonly used sterilization techniques on 3D printed clinical objects. Materials & Methods: The two sterilization methods used in our hospital and investigated in this paper are: Steam heat and Gas plasma. Three objects were printed and tested in this study: a tooth replica, an orthognathic final splint, a surgical cutting guide for the purpose of mandible reconstruction. For each of the 3 objects, 4 copies were made: one original STL object, one copy of the object pre-sterilization, one copy of post-steam heat sterilization, and one copy of post-gas plasma sterilization...
2018: Open Dentistry Journal
https://www.readbyqxmd.com/read/29481493/contour-restoration-of-over-resected-mandibular-angle-and-lower-border-by-reduction-mandibuloplasty-using-three-dimensional-planning-and-computer-aided-design-and-manufacturing-custom-made-titanium-implants
#14
Jae Man Woo, Seung-Hak Baek, Jong-Cheol Kim, Jin-Young Choi
OBJECTIVE: The purpose of this clinical report was to introduce a new methodology for contour restoration of the over-resected mandible by reduction mandibuloplasty using 3-dimensional (3D) planning and computer-assisted design and manufacturing (CAD-CAM) custom-made titanium implants. PATIENT AND METHOD: A 20-year-old male patient had undergone reduction of the zygoma and mandibular angle and lower border for esthetic reason 1 year ago at a private clinic. However, he was not satisfied with surgical outcome and wanted to restore his original facial volume and contour...
February 23, 2018: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/29480235/3d-cone-beam-computed-tomography-reconstruction-images-in-diagnosis-of-ameloblastomas-of-lower-jaw-a-case-report-and-mini-review
#15
Dize Li, Zhiqiang Yang, Tao Chen, Chao Guan, Feilong Wang, Ethan L Matz, Yuanyuan Zhang, Ping Ji
Cone beam computed tomography (CBCT) has obvious advantages over regular radiography in diagnosis of complex diseases. Objective of this study is to report a case of a mandibular jaw ameloblastoma recurring cyst, which represents a benign tumor of odontogenic epithelium, using CBCT imaging technology. CBCT examination of the patient suffering with recurrent lower jaw cyst (relapsing four years after surgery) showed a decrease in irregular bone density and appearance of a honeycomb pattern (3.5 cm×2.5 cm×1...
2018: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/29480233/3d-reconstruction-images-of-cone-beam-computed-tomography-applied-to-maxillofacial-fractures-a-case-study-and-mini-review
#16
Liyun Bai, Linlin Li, Kexin Su, Anthony Bleyer, Yuanyuan Zhang, Ping Ji
Maxillofacial injuries can be complex and are clinically important due to their functional and cosmetic significance. Maltreated and missed fractures might cause deformity of the face; thus, accurate evaluation of the fracture provided by X-ray images is critical. In this study, we explore the application of cone-beam computed tomography (CBCT) for diagnosis of severe maxillofacial traumas. A patient with a complex fracture that affects the maxilla, mandible, wall of the maxillary sinus, zygoma, zygomatic arch and nasal bone was diagnosed using 3D reconstruction of CBCT images...
2018: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/29464171/dimensional-error-in-rapid-prototyping-with-open-source-software-and-low-cost-3d-printer
#17
Marco A Rendón-Medina, Laura Andrade-Delgado, Jose E Telich-Tarriba, Antonio Fuente-Del-Campo, Carlos A Altamirano-Arcos
Rapid prototyping models (RPMs) had been extensively used in craniofacial and maxillofacial surgery, especially in areas such as orthognathic surgery, posttraumatic or oncological reconstructions, and implantology. Economic limitations are higher in developing countries such as Mexico, where resources dedicated to health care are limited, therefore limiting the use of RPM to few selected centers. This article aims to determine the dimensional error of a low-cost fused deposition modeling 3D printer (Tronxy P802MA, Shenzhen, Tronxy Technology Co), with Open source software...
January 2018: Plastic and Reconstructive Surgery. Global Open
https://www.readbyqxmd.com/read/29457933/computer-guided-inferior-alveolar-nerve-lateralization-with-simultaneous-implant-placement-a-preliminary-report
#18
Mohamed Atef, Mohamed Mounir
Placement of Dental implants in the posterior mandibular alveolar ridges may become a challenging procedure due to limited bone height between the crest of the ridge and the inferior alveolar canal. The aim of this study was to introduce an innovative, less invasive, highly accurate and easy surgical technique of inferior alveolar nerve lateralization in the posterior deficient mandible using a special customized 3D-printed surgical guide in order to enhance the bone height for implant placement. This was a case series study included 7 patients with unilateral edentulous mandibular alveolar ridges...
March 6, 2018: Journal of Oral Implantology
https://www.readbyqxmd.com/read/29447759/ecomorphological-analysis-of-bovid-mandibles-from-laetoli-tanzania-using-3d-geometric-morphometrics-implications-for-hominin-paleoenvironmental-reconstruction
#19
Frances L Forrest, Thomas W Plummer, Ryan L Raaum
The current study describes a new method of mandibular ecological morphology (ecomorphology). Three-dimensional geometric morphometrics (3D GM) was used to quantify mandibular shape variation between extant bovids with different feeding preferences. Landmark data were subjected to generalized Procrustes analysis (GPA), principal components analysis (PCA), and discriminant function analysis (DFA). The PCA resulted in a continuum from grazers to browsers along PC1 and DFA classified 88% or more of the modern specimens to the correct feeding category...
January 2018: Journal of Human Evolution
https://www.readbyqxmd.com/read/29447757/using-the-covariation-of-extant-hominoid-upper-and-lower-jaws-to-predict-dental-arcades-of-extinct-hominins
#20
Stefanie Stelzer, Philipp Gunz, Simon Neubauer, Fred Spoor
Upper and lower jaws are well represented in the fossil record of mammals and are frequently used to diagnose species. Some hominin species are only known by either their maxillary or mandibular morphology, and in this study, we explore the possibility of predicting their complementary dental arcade shape to aid the recognition of conspecific specimens in the fossil record. To this end, we apply multiple multivariate regression to analyze 3D landmark coordinates collected on associated upper and lower dental arcades of extant Homo, Pan, Gorilla, Pongo, and Hylobates...
January 2018: Journal of Human Evolution
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