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https://www.readbyqxmd.com/read/28708129/validation-of-a-novel-imaging-approach-using-multi-slice-ct-and-cone-beam-ct-to-follow-up-on-condylar-remodeling-after-bimaxillary-surgery
#1
Laura Ferreira Pinheiro Nicolielo, Jeroen Van Dessel, Eman Shaheen, Carolina Letelier, Marina Codari, Constantinus Politis, Ivo Lambrichts, Reinhilde Jacobs
The main goal of this study was to introduce a novel three-dimensional procedure to objectively quantify both inner and outer condylar remodelling on preoperative multi-slice computed tomography (MSCT) and postoperative cone-beam computed tomography (CBCT) images. Second, the reliability and accuracy of this condylar volume quantification method was assessed. The mandibles of 20 patients (11 female and 9 male) who underwent bimaxillary surgery were semi-automatically extracted from MSCT/CBCT scans and rendered in 3D...
July 14, 2017: International Journal of Oral Science
https://www.readbyqxmd.com/read/28693947/synchrotron-radiation-%C3%AE-ct-and-histology-evaluation-of-bone-to-implant-contact
#2
Camilla Albeck Neldam, Jon Sporring, Alexander Rack, Torsten Lauridsen, Ellen-Margrethe Hauge, Henrik L Jørgensen, Niklas Rye Jørgensen, Robert Feidenhansl, Else Marie Pinholt
The purpose of this study was to evaluate bone-to-implant contact (BIC) in two-dimensional (2D) histology compared to high-resolution three-dimensional (3D) synchrotron radiation micro computed tomography (SR micro-CT). High spatial resolution, excellent signal-to-noise ratio, and contrast establish SR micro-CT as the leading imaging modality for hard X-ray microtomography. Using SR micro-CT at voxel size 5 μm in an experimental goat mandible model, no statistically significant difference was found between the different treatment modalities nor between recipient and reconstructed bone...
June 3, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28682875/the-use-of-3d-printed-titanium-mesh-tray-in-treating-complex-comminuted-mandibular-fractures-a-case-report
#3
Junli Ma, Limin Ma, Zhifa Wang, Xiongjie Zhu, Weijian Wang
RATIONALE: Precise bony reduction and reconstruction of optimal contour in treating comminuted mandibular fractures is very difficult using traditional techniques and devices. The aim of this report is to introduce our experiences in using virtual surgery and three-dimensional (3D) printing technique in treating this clinical challenge. PATIENT CONCERNS: A 26-year-old man presented with severe trauma in the maxillofacial area due to fall from height. DIAGNOSIS: Computed tomography images revealed middle face fractures and comminuted mandibular fracture including bilateral condyles...
July 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28680711/three-dimensional-measurement-of-periodontal-surface-area-for-quantifying-inflammatory-burden
#4
Sa-Beom Park, So-Youn An, Won-Jeong Han, Jong-Tae Park
PURPOSE: Measurement of the root surface area (RSA) is important in periodontal treatment and for the evaluation of periodontal disease as a risk factor for systemic disease. The aim of this study was to measure the RSA at 6 mm below the cementoenamel junction (CEJ) using the Mimics software (Materialise, Leuven, Belgium). METHODS: We obtained cone-beam computed tomography (CBCT) data from 33 patients who had visited the Department of Oral and Maxillofacial Radiology of Dankook University Dental Hospital...
June 2017: Journal of Periodontal & Implant Science
https://www.readbyqxmd.com/read/28659977/facial-mobility-after-maxilla-mandibular-advancement-in-patients-with-severe-obstructive-sleep-apnea-syndrome-a-three-dimensional-study
#5
Laura Verzé, Francesca Antonella Bianchi, Niccolò Barla, Serena Maria Curti, Giovanni Gerbino, Guglielmo Amedeo Ramieri
Introduction. The functional results of surgery in terms of facial mobility are key elements in the treatment of patients. Little is actually known about changes in facial mobility following surgical treatment with maxillomandibular advancement (MMA). Objectives. The three-dimensional (3D) methods study of basic facial movements in typical OSAS patients treated with MMA was the topic of the present research. Materials and Methods. Ten patients affected by severe obstructive sleep apnea syndrome (OSAS) were engaged for the study...
2017: International Journal of Dentistry
https://www.readbyqxmd.com/read/28656622/a-population-level-atlas-of-mus-musculus-craniofacial-skeleton-and-automated-image-based-shape-analysis
#6
A Murat Maga, Nicholas J Tustison, Brian B Avants
Laboratory mice are staples for evo/devo and genetics studies. Inbred strains provide a uniform genetic background to manipulate and understand gene-environment interactions, while their crosses have been instrumental in studies of genetic architecture, integration and modularity, and mapping of complex biological traits. Recently, there have been multiple large-scale studies of laboratory mice to further our understanding of the developmental basis, evolution, and genetic control of shape variation in the craniofacial skeleton (i...
June 28, 2017: Journal of Anatomy
https://www.readbyqxmd.com/read/28639069/the-application-of-3d-printing-technology-for-simultaneous-orthognathic-surgery-and-mandibular-contour-osteoplasty-in-the-treatment-of-craniofacial-deformities
#7
Yanju Xiao, Xiumei Sun, Lin Wang, Yaoyao Zhang, Kai Chen, Guomin Wu
BACKGROUND: Because of the limitation of specific preoperative design and surgical templates, orthognathic surgery and mandibular contour osteoplasty are generally performed in two stages. Three-dimensional printing technology has improved the accuracy of the surgery and results in good surgical predictability easily. This study aims to confirm the effectiveness, feasibility and precision of simultaneous mandibular contour osteoplasty and orthognathic surgery with the assistance of 3D printing technology...
June 21, 2017: Aesthetic Plastic Surgery
https://www.readbyqxmd.com/read/28630959/a-completely-cad-cam-individual-transmission-device-for-electronic-mandible-movement-registration
#8
Karl-Friedrich Krey, Bernd Kordaß, Sebastian Ruge
The connection of a device for the registration of mandibular movements depends on the coupling of the teeth with a paraocclusal adapter. This is normally done by individualizing a prefabricated metal support, either directly on the patient or in the dental laboratory. The goal was to create an individual paraocclusal adapter by means of additive computer-assisted design/computer-assisted manufacturing (CAD/CAM) procedures, and to test it clinically. Starting from intraoral scans of the maxillary and mandibular teeth, an individual paraocclusal adapter was constructed by combining an adapter piece adapted to the tooth and jaw shape with a prefabricated standard part...
2017: International Journal of Computerized Dentistry
https://www.readbyqxmd.com/read/28630862/influence-of-deformation-and-stress-between-bone-and-implant-from-various-bite-forces-by-numerical-simulation-analysis
#9
Hsin-Chung Cheng, Boe-Yu Peng, May-Show Chen, Chiung-Fang Huang, Yi Lin, Yung-Kang Shen
Endosseous oral implant is applied for orthodontic anchorage in subjects with multiple tooth agenesis. Its effectiveness under orthodontic loading has been demonstrated clinically and experimentally. This study investigates the deformation and stress on the bone and implant for different bite forces by three-dimensional (3D) finite element (FE) methods. A numerical simulation of deformation and stress distributions around implants was used to estimate the survival life for implants. The model was applied to determine the pattern and distribution of deformations and stresses within the endosseous implant and on supporting tissues when the endosseous implant is used for orthodontic anchorage...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28629601/a-custom-made-temporomandibular-joint-prosthesis-for-fabrication-by-selective-laser-melting-finite-element-analysis
#10
Xiangliang Xu, Danmei Luo, Chuanbin Guo, Qiguo Rong
A novel and custom-made selective laser melting (SLM) 3D-printed alloplastic temporomandibular joint (TMJ) prosthesis is proposed. The titanium-6aluminium-4vanadium (Ti-6Al-4V) condyle component and ultra-high molecular weight polyethylene (UHMWPE) fossa component comprised the total alloplastic TMJ replacement prosthesis. For the condyle component, an optimized tetrahedral open-porous scaffold with combined connection structures, i.e. an inlay rod and an onlay plate, between the prosthesis and remaining mandible was designed...
June 16, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28623681/soft-tissue-changes-measured-with-three-dimensional-software-provides-new-insights-for-surgical-predictions
#11
Yu-Jen Chang, Antônio C O Ruellas, Marilia S Yatabe, Philip M Westgate, Lucia H S Cevidanes, Sarandeep S Huja
PURPOSE: Although computer-aided craniofacial reconstructions allow for simulation of hard tissue changes, the prediction of the final soft tissue facial changes remains a challenge. The purpose of the present study was to evaluate the 3-dimensional (3D) soft tissue changes in patients undergoing 2-jaw orthognathic surgery. PATIENTS AND METHODS: For the present retrospective cohort study, 40 consecutive patients (11 men and 29 women; mean age 23.5 ± 4.9 years) who had undergone 2-jaw orthognathic surgery were selected...
May 24, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28598185/three-dimensional-longitudinal-changes-of-maxilla-and-mandible-morphology-during-the-predental-period
#12
T Kihara, Y Kaihara, S Iwamae, N Niizato, S Gion, T Taji, K Kozai, H Nikawa
AIM: The purpose of this study was to longitudinally analyse the morphology of maxilla and mandible over time in infants using a three-dimensional (3D) surface scanner. MATERIALS AND METHODS: Seventeen Japanese full-term infants participated in the study. Dental plaster models were fabricated every 3 months from 1 month of age to 12 months. The plaster models were scanned using the 3D surface scanner to create 3D models. The arch width, arch length, arch angle, palatal depth and palatal area of the 3D models were analysed...
June 2017: European Journal of Paediatric Dentistry: Official Journal of European Academy of Paediatric Dentistry
https://www.readbyqxmd.com/read/28584727/the-presumed-oldest-flying-insect-more-likely-a-myriapod
#13
Carolin Haug, Joachim T Haug
The early fossil record of insects is scarce, with only few finds in the Devonian. All these finds appear problematic and controversial, partly due to incomplete preservation and challenging interpretation of many structures. We provide details of one of these important forms, Rhyniognatha hirsti from the famous Rhynie Chert Lagerstätte with up-to-date 3D imaging techniques. The fossil has been interpreted as the remains of one of the earliest flying insects. The specimen mainly preserves the remains of the head...
2017: PeerJ
https://www.readbyqxmd.com/read/28571251/evaluation-of-interdental-spaces-of-the-mandibular-posterior-area-for-orthodontic-mini-implants-with-cone-beam-computed-tomography
#14
Seyed Hossein Moslemzadeh, Aydin Sohrabi, Ali Rafighi, Yusef Kananizadeh, Amin Nourizadeh
INTRODUCTION: The use of mini-implants has increased in recent years because of their role in absolute anchorage, but the placement sites may affect the success or failure of the procedure, so it is very important to determine the appropriate and safe location for orthodontic mini-implants. On the other hand, the Cone Beam Computed Tomography (CBCT), which offers clear 3-Dimentional (3D) images, has been widely used in orthodontics and implant dentistry for surgical guidance of mini-implant placement...
April 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28555157/accuracy-evaluation-of-a-stereolithographic-surgical-template-for-dental-implant-insertion-using-3d-superimposition-protocol
#15
Corina Marilena Cristache, Silviu Gurbanescu
THE AIM: of this study was to evaluate the accuracy of a stereolithographic template, with sleeve structure incorporated into the design, for computer-guided dental implant insertion in partially edentulous patients. MATERIALS AND METHODS: Sixty-five implants were placed in twenty-five consecutive patients with a stereolithographic surgical template. After surgery, digital impression was taken and 3D inaccuracy of implants position at entry point, apex, and angle deviation was measured using an inspection tool software...
2017: International Journal of Dentistry
https://www.readbyqxmd.com/read/28542468/alveoli-teeth-and-tooth-loss-understanding-the-homology-of-internal-mandibular-structures-in-mysticete-cetaceans
#16
Carlos Mauricio Peredo, Nicholas D Pyenson, Mark D Uhen, Christopher D Marshall
The evolution of filter feeding in baleen whales (Mysticeti) facilitated a wide range of ecological diversity and extreme gigantism. The innovation of filter feeding evolved in a shift from a mineralized upper and lower dentition in stem mysticetes to keratinous baleen plates that hang only from the roof of the mouth in extant species, which are all edentulous as adults. While all extant mysticetes are born with a mandible lacking a specialized feeding structure (i.e., baleen), the bony surface retains small foramina with elongated sulci that often merge together in what has been termed the alveolar gutter...
2017: PloS One
https://www.readbyqxmd.com/read/28536534/a-bio-realistic-finite-element-model-to-evaluate-the-effect-of-masticatory-loadings-on-mouse-mandible-related-tissues
#17
Alexander Tsouknidas, Lucia Jimenez-Rojo, Evangelos Karatsis, Nikolaos Michailidis, Thimios A Mitsiadis
Mice are arguably the dominant model organisms for studies investigating the effect of genetic traits on the pathways to mammalian skull and teeth development, thus being integral in exploring craniofacial and dental evolution. The aim of this study is to analyse the functional significance of masticatory loads on the mouse mandible and identify critical stress accumulations that could trigger phenotypic and/or growth alterations in mandible-related structures. To achieve this, a 3D model of mouse skulls was reconstructed based on Micro Computed Tomography measurements...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28529102/comparative-study-of-three-kinds-of-fibula-cutting-guides-in-reshaping-fibula-for-the-reconstruction-of-mandible-an-accuracy-simulation-study-in%C3%A2-vitro
#18
Zhiwei Dong, Bei Li, Rui Xie, Qin Wu, Li Zhang, Shizhu Bai
OBJECTIVES: In order to get predictable reassembling and higher accuracy in the reconstruction of the mandible, we designed three kinds of fibula cutting guides: (1) Two-edge wide groove guide (WGG); (2) Two-edge narrow groove guide (NGG); and (3) One-edge guide (OEG). The purpose of this study was to compare the accuracy of fibula remodelling using the three kinds of fibula cutting guides above in a simulation procedure in vitro. MATERIALS AND METHODS: Cutting and reshaping of fibula analogs were guided by the three kinds of guides mentioned above...
April 22, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28507963/evaluation-of-efficacy-of-three-dimensional-stainless-steel-mini-plates-in-the-treatment-of-fractures-of-the-mandible-a-prospective-study
#19
Shreyas H Gupte, Shruti Chaddva, Yash Jethwani, Aditi Mohandas, Digvijay P Kumavat, Nirali Jhaveri
INTRODUCTION: The purpose of the study was to analyze whether adequate fracture fixation can be achieved by three-dimensional (3D) stainless steel mini-plates its ease of placement, whether the patient can resume function early and to find out the need to do intermaxillary fixation. MATERIALS AND METHODS: In the prospective study, we treated 12 patients and 17 fractured sites using 3D mini-plates. Once fracture reduction was achieved temporary intermaxillary fixation (IMF) was done occlusion was achieved and the fractured segments were fixed using 3D plates either 4-holed or 6-holed of 2...
November 2016: Journal of Orthopaedic Case Reports
https://www.readbyqxmd.com/read/28494035/an-in-vitro-model-to-evaluate-the-accuracy-of-guided-implant-placement-based-on-the-surgeon-s-experience
#20
Ángeles Fernández-Gil, Herminia Serrano Gil, Miguel González Velasco, José C Moreno Vázquez
PURPOSE: To evaluate whether there are differences in the accuracy of guided implant placement based on the surgeon's experience level. MATERIALS AND METHODS: Fifteen surgeons, divided into three groups based on experience level (group I, expert; group II, intermediate; group III, novice), placed six implants in five identical mandibles (75 mandibles and 450 implants). A planning and stereolithographic guide was generated using cone beam computed tomography (CBCT) images and implant planning software (Nemoscan, Nemotec) and was used in all cases...
May 2017: International Journal of Oral & Maxillofacial Implants
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