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https://www.readbyqxmd.com/read/29891196/modal-analysis-for-implant-stability-assessment-sensitivity-of-this-methodology-for-different-implant-designs
#1
Elisabetta Maria Zanetti, Stefano Ciaramella, Michele Calì, Giulia Pascoletti, Massimo Martorelli, Riccardo Asero, David C Watts
OBJECTIVE: To investigate the influence of implant design on the change in the natural frequency of bone-implant system during osseointegration by means of a modal 3D finite element analysis. METHODS: Six implants were considered. Solid models were obtained by means of reverse engineering techniques. The mandibular bone geometry was built-up from a CT scan dataset through image segmentation. Each implant was virtually implanted in the mandibular bone. Two different models have been considered, differing in the free length of the mandibular branch ('long branch' and 'short branch') in order to simulate the variability of boundary conditions when performing vibrometric analyses...
June 8, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29884410/multi-modality-3d-mandibular-resection-planning-in-head-and-neck-cancer-using-ct-and-mri-data-fusion-a-clinical-series
#2
J Kraeima, B Dorgelo, H A Gulbitti, R J H M Steenbakkers, K P Schepman, J L N Roodenburg, F K L Spijkervet, R H Schepers, M J H Witjes
OBJECTIVES: 3D virtual surgical planning (VSP) and guided surgery has been proven to be an effective tool for resection and reconstruction of the mandible. Currently, most widely used 3D VSP approaches to mandibular resection do not include detailed tumour information in the VSP. This manuscript presents a strategy where the aim was to incorporate tumour visualisation into the 3D virtual plan. Three-dimensional VSP of the mandibular resections was based on the fusion of CT and MRI data which was subsequently applied in clinical practice...
June 2018: Oral Oncology
https://www.readbyqxmd.com/read/29859953/on-site-3-dimensional-printing-and-preoperative-adaptation-decrease-operative-time-for-mandibular-fracture-repair
#3
Brett J King, Earl Peter Park, Brian J Christensen, Raman Danrad
PURPOSE: The purpose of this study was to compare the intraoperative time and operating room costs between patients with mandibular fractures treated with traditional adaptation and fixation and patients treated with preadapted plates created with on-site 3-dimensionally printed models. PATIENTS AND METHODS: We designed a prospective comparative cohort study for patients with mandibular fractures. The control group received traditional open reduction and internal fixation of their mandibular fractures...
May 15, 2018: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29859796/a-digital-approach-to-dynamic-jaw-tracking-using-a-target-tracking-system-and-a-structured-light-three-dimensional-scanner
#4
Joo Hyun Kwon, Sungbin Im, Minho Chang, Jong-Eun Kim, June-Sung Shim
PURPOSE: This technical procedure describes a method for tracking mandibular movement using a three-dimensional (3D) optical scanner and target tracking system to digitally portray the motion of the mandible and temporomandibular joints by merging cone beam computed tomography (CBCT) data. METHODS: Four nonreflective targets were attached to the labial surface of the incisors in a noncolinear arrangement. Mandibular movement was tracked directly using a 3D facial scanner and target tracking software after merging facial scanning data, digital data obtained from a diagnostic cast, and CBCT scan data based on several landmarks of the anterior teeth...
May 30, 2018: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/29857967/who-were-the-nataruk-people-mandibular-morphology-among-late-pleistocene-and-early-holocene-fisher-forager-populations-of-west-turkana-kenya
#5
Aurélien Mounier, Maria Correia, Frances Rivera, Federica Crivellaro, Ronika Power, Joe Jeffery, Alex Wilshaw, Robert A Foley, Marta Mirazón Lahr
Africa is the birthplace of the species Homo sapiens, and Africans today are genetically more diverse than other populations of the world. However, the processes that underpinned the evolution of African populations remain largely obscure. Only a handful of late Pleistocene African fossils (∼50-12 Ka) are known, while the more numerous sites with human fossils of early Holocene age are patchily distributed. In particular, late Pleistocene and early Holocene human diversity in Eastern Africa remains little studied, precluding any analysis of the potential factors that shaped human diversity in the region, and more broadly throughout the continent...
May 29, 2018: Journal of Human Evolution
https://www.readbyqxmd.com/read/29844540/synchrotron-radiation-reveals-the-identity-of-the-large-felid-from-monte-argentario-early-pleistocene-italy
#6
Marco Cherin, Dawid A Iurino, Marco Zanatta, Vincent Fernandez, Alessandro Paciaroni, Caterina Petrillo, Roberto Rettori, Raffaele Sardella
We describe here a partial skull with associated mandible of a large felid from Monte Argentario, Italy (Early Pleistocene; ~1.5 million years). Propagation x-ray phase-contrast synchrotron microtomography of the specimen, still partially embedded in the rock matrix, allows ascribing it reliably to Acinonyx pardinensis, one of the most intriguing extinct carnivorans of the Old World Plio-Pleistocene. The analysis of images and 3D models obtained through synchrotron microtomography - here applied for the first time on a Plio-Pleistocene carnivoran - reveals a mosaic of cheetah-like and Panthera-like features, with the latter justifying previous attributions of the fossil to the extinct Eurasian jaguar Panthera gombaszoegensis...
May 29, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29803823/design-and-clinical-outcome-of-a-novel-3d-printed-prosthetic-joint-replacement-for-the-human-temporomandibular-joint
#7
David Ackland, Dale Robinson, Peter Vee Sin Lee, George Dimitroulis
BACKGROUND: Stock prosthetic temporomandibular joint replacements come in limited sizes, and do not always encompass the joint anatomy that presents clinically. The aims of this study were twofold. Firstly, to design a personalized prosthetic total joint replacement for the treatment of a patient's end-stage temporomandibular joint osteoarthritis, to implant the prosthesis into the patient, and assess clinical outcome 12-months post-operatively; and secondly, to evaluate the influence of changes in prosthetic condyle geometry on implant load response during mastication...
May 11, 2018: Clinical Biomechanics
https://www.readbyqxmd.com/read/29797637/mandibular-growth-in-survivors-of-pediatric-parotid-gland-carcinoma-treated-with-interstitial-brachytherapy
#8
Wen-Jie Wu, Ming-Wei Huang, Guo-Hao Zhang, Dan Zhao, Lei Zheng, Guang-Yan Yu, Jian-Guo Zhang
BACKGROUND: The aim of the study was to present long-term results of mandibular growth in pediatric parotid gland carcinoma survivors treated with interstitial brachytherapy. PROCEDURE: Twenty-five survivors of pediatric parotid gland carcinoma treated with iodine-125 seed interstitial brachytherapy were included for quantitative analysis, including three dimensional (3D) cephalometry and measurement of mandibular volume. RESULTS: 3D cephalometry showed that the median fore-and-aft increments of the lengths of the condyle, the ramus, and the body of the mandible were 1...
May 24, 2018: Pediatric Blood & Cancer
https://www.readbyqxmd.com/read/29763504/investigational-clinical-trial-of-a-prototype-optoelectronic-computer-aided-navigation-device-for-dental-implant-surgery
#9
Asbjørn Jokstad, Brenton Winnett, Joseph Fava, David Powell, Eszter Somogyi-Ganss
PURPOSE: New digital technologies enable real-time computer-aided (CA) three-dimensional (3D) guidance during dental implant surgery. The aim of this investigational clinical trial was to demonstrate the safety and effectiveness of a prototype optoelectronic CA-navigation device in comparison with the conventional approach for planning and effecting dental implant surgery. MATERIALS AND METHODS: Study participants with up to four missing teeth were recruited from the pool of patients referred to the University of Toronto Graduate Prosthodontics clinic...
May 2018: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/29727702/prmt1-regulates-craniofacial-bone-formation-upstream-of-msx1
#10
Yongchao Gou, Jingyuan Li, Jian Wu, Rahul Gupta, Ihnbae Cho, Thach-Vu Ho, Yang Chai, Amy Merrill, Jun Wang, Jian Xu
Protein arginine methylation has been recently identified as an important form of post-translational modification (PTM). It is carried out by the protein arginine methyltransferase (PRMT) family of enzymes, which in mammals consists of nine members. Among them, PRMT1 is the major arginine methyltransferase and participates in transcription, signal transduction, development and cancer. The function of PRMT1 in craniofacial development remains unclear. We generated Wnt1-Cre;Prmt1fl/fl mice with cranial neural crest (CNC)-specific deletion of Prmt1 and compared CNC-derived craniofacial bones from newborn control and Wnt1-Cre;Prmt1fl/fl mice...
May 1, 2018: Mechanisms of Development
https://www.readbyqxmd.com/read/29716816/patient-specific-pre-contouring-of-osteosynthesis-plates-for-mandibular-reconstruction-using-a-three-dimensional-key-printed-solution
#11
J Kraeima, H H Glas, M J H Witjes, K P Schepman
PURPOSE: In mandibular reconstructive surgery, the osteosynthesis plates require contouring according to the patients' individual anatomical situation. These plates are frequently contoured around a three-dimensional (3D) printed model. However, the translation to the actual patient can introduce inaccuracies and unwanted rotations in the condyles and mandibular ramus, due to malpositioning of the pre-contoured plate. MATERIALS AND METHODS: This article describes an easy-access method for exact translation of the pre-contoured plate to the patient's mandible...
April 6, 2018: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/29680849/virtual-planning-and-3d-printing-modeling-for-mandibular-reconstruction-with-fibula-free-flap
#12
W Ren, L Gao, S Li, C Chen, F Li, Q Wang, Y Zhi, J Song, Z Dou, L Xue, K Zhi
BACKGROUND: This study was to evaluate the use of virtual planning and 3D printing modeling in mandibular reconstruction and compare the operation time and surgical outcome of this technique with conventional method. MATERIAL AND METHODS: Between 2014 and 2017, 15 patients underwent vascularized fibula flap mandibular reconstruction using virtual planning and 3D printing modeling. Titanium plates were pre-bent using the models and cutting guides were used for osteotomies...
May 1, 2018: Medicina Oral, Patología Oral y Cirugía Bucal
https://www.readbyqxmd.com/read/29671153/novel-method-for-superposing-3d-digital-models-for-monitoring-orthodontic-tooth-movement
#13
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-ct-image-artifacts-related-to-zirconium-and-titanium-implants-impact-on-image-quality
#14
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 CT(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. Artifact was assessed by measuring the standard deviation (SD) of gray values and contrast-to-noise ratio (CNR) of 11 regions of interest (ROIs) at different distances (1...
May 10, 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
#15
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
#16
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
#17
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...
May 2018: Journal of Endodontics
https://www.readbyqxmd.com/read/29574815/reconstruction-of-major-defects-of-the-jaws
#18
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
#19
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...
May 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
#20
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
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