keyword
MENU ▼
Read by QxMD icon Read
search

3D mandible

keyword
https://www.readbyqxmd.com/read/28337564/lower-face-cephalometry-based-on-quadrilateral-analysis-with-cone-beam-computed-tomography-a-clinical-pilot-study
#1
Adrienn Dobai, Tamás Vizkelety, Zsolt Markella, Adrienne Rosta, Ágnes Kucsera, József Barabás
OBJECTIVE: As most orthognathic surgeries focus on the lower face, the aim of this study was to transfer previously developed two-dimensional cephalometry-which is useful for surgeons in the orthognathic surgery of the lower face-to three-dimensional (3D) cephalometry by using cone-beam computed tomography (CBCT). We selected the quadrilateral lower face analysis developed by the surgeon Di Paolo, who focused only for the lower face and mentioned that data in millimeters are more easy to use than angles for surgeons...
March 23, 2017: Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28300494/three-dimensional-morphological-characterization-of-malocclusions-with-mandibular-lateral-displacement-using-cone-beam-computed-tomography
#2
Roberto L Velásquez, Jorge C Coro, Alejandra Londoño, Susan P McGorray, Timothy T Wheeler, Sadao Sato
OBJECTIVE: The purpose of this study was to evaluate the morphologic characteristics of MLD malocclusions using 3D imaging. MATERIALS AND METHODS: MLD characteristics were examined using CBCT data in 40 subjects. A 3D Cephalometric analysis was developed to describe the spatial position of the mandible and temporal bones. RESULTS: Vertical dental heights were shorter and the posterior occlusal plane (POP) presented a steeper sagittal inclination on the shifted side (the side of the laterally displaced bony chin) than on the contralateral side...
March 16, 2017: Cranio: the Journal of Craniomandibular Practice
https://www.readbyqxmd.com/read/28294206/evaluation-of-accuracy-and-repeatability-using-cbct-and-a-dental-scanner-by-means-of-3d-software
#3
So-Ri Kim, Chong-Myeong Kim, Il-Do Jeong, Woong-Chul Kim, Hae-Young Kim, Ji-Hwan Kim
OBJECTIVE: The objective of the present study was to compare and evaluate the accuracy of three-dimensional (3D) image data acquired from cone beam computed tomography (CBCT) and a dental scanner using 3D software. MATERIALS AND METHODS: After selecting the full-arch forms of the maxilla and mandible as the master cast, the master cast was scanned via a high-precision optical scanner for use as master model data. The model was scanned 12 times each using CBCT and a dental scanner...
2017: International Journal of Computerized Dentistry
https://www.readbyqxmd.com/read/28293442/cone-beam-ct-in-diagnosis-and-surgical-planning-of-dentigerous-cyst
#4
Naira Figueiredo Deana, Nilton Alves
Diagnosis and preoperative planning are critical in the execution of any surgical procedure. Panoramic radiography is a routine method used in dentistry to assist clinical diagnosis; however, with this technique 3D anatomical structures are compressed into 2D images, resulting in overlapping of structures which are of interest in the diagnosis. In this study we report the case of a patient who presented with a dentigerous cyst of expressive dimensions in the body of the mandible region. The surgery was planned and executed after observing the margins of the lesion by Cone Beam Computed Tomography (CBCT)...
2017: Case Reports in Dentistry
https://www.readbyqxmd.com/read/28265518/digital-reconstruction-of-the-mandible-of-an-adult-lesothosaurus-diagnosticus-with-insight-into-the-tooth-replacement-process-and-diet
#5
Lara Sciscio, Fabien Knoll, Emese M Bordy, Michiel O de Kock, Ragna Redelstorff
Fragmentary caudal ends of the left and right mandible assigned to Lesothosaurus diagnosticus, an early ornithischian, was recently discovered in the continental red bed succession of the upper Elliot Formation (Lower Jurassic) at Likhoele Mountain (Mafeteng District) in Lesotho. Using micro-CT scanning, this mandible could be digitally reconstructed in 3D. The replacement teeth within the better preserved (left) dentary were visualised. The computed tomography dataset suggests asynchronous tooth replacement in an individual identified as an adult on the basis of bone histology...
2017: PeerJ
https://www.readbyqxmd.com/read/28249001/accuracy-and-reproducibility-of-virtual-cutting-guides-and-3d-navigation-for-osteotomies-of-the-mandible-and-maxilla
#6
Jonathan M Bernstein, Michael J Daly, Harley Chan, Jimmy Qiu, David Goldstein, Nidal Muhanna, John R de Almeida, Jonathan C Irish
BACKGROUND: We set out to determine the accuracy of 3D-navigated mandibular and maxillary osteotomies with the ultimate aim to integrate virtual cutting guides and 3D-navigation into ablative and reconstructive head and neck surgery. METHODS: Four surgeons (two attending, two clinical fellows) completed 224 unnavigated and 224 3D-navigated osteotomies on anatomical models according to preoperative 3D plans. The osteotomized bones were scanned and analyzed. RESULTS: Median distance from the virtual plan was 2...
2017: PloS One
https://www.readbyqxmd.com/read/28247449/computational-approach-to-identify-different-injuries-by-firearms
#7
Sarah Teixeira Costa, Alexandre Rodrigues Freire, Rodrigo Ivo Matoso, Eduardo Daruge Júnior, Ana Cláudia Rossi, Felippe Bevilacqua Prado
Complications arise in the analysis of gunshot wounds to the maxillofacial region, when neither the projectile nor the gun is found at the crime scene. We simulated 5- and 15-cm firing distances at a human mandible to investigate the external morphology of entrance wounds based on fire range. The ammunition models, .40-caliber S&W, .380-caliber, and 9 × 19-mm Luger, were constructed with free-form NURBS surfaces. In a dynamic simulation, projectiles were fired against mandibular body 3D model at 5 and 15 cm...
March 2017: Journal of Forensic Sciences
https://www.readbyqxmd.com/read/28220302/sex-estimation-using-computed-tomography-of-the-mandible
#8
Tanya Sella Tunis, Rachel Sarig, Haim Cohen, Bahaa Medlej, Nathan Peled, Hila May
Sex estimation of skeletal parts is of great value even in the DNA era. When computed tomography (CT) facilities were introduced to forensic institutes, new possibilities for sex estimation emerged. The aim of this study was to develop a CT-based method for sex estimation using the mandible. Twenty-five CT-based measurements of the mandible were developed and carried out on 3D reconstructions (volume rendering) and cross sections of the lower jaw of 438 adult individuals (214 males and 224 females). Intraobserver and interobserver variances of the measurements were examined using intraclass correlation coefficient (ICC) analysis...
February 20, 2017: International Journal of Legal Medicine
https://www.readbyqxmd.com/read/28218215/correlation-between-condylar-fracture-pattern-after-parasymphyseal-impact-and-condyle-morphological-features-a-retrospective-analysis-of-107-chinese-patients
#9
Lu Han, Ting Long, Wei Tang, Lei Liu, Wei Jing, Wei-Dong Tian, Jie Long
BACKGROUND: The treatment of the condylar fractures is difficult. Factors that result in the fractures are complex. The objective of this morphometric study was to investigate the relationship between condylar fracture patterns and condylar morphological characteristics. METHODS: We conducted a retrospective analysis of 107 patients admitted to the West China Hospital of Stomatology for bilateral condylar fractures caused by parasymphyseal impact. The patients were divided into five groups according to the type of condylar fracture...
February 20, 2017: Chinese Medical Journal
https://www.readbyqxmd.com/read/28169256/stress-analysis-at-bone-implant-interface-of-single-and-two-implant-retained-mandibular-overdenture-using-three-dimensional-finite-element-analysis
#10
Krishnakumar Lahoti, Anup Pathrabe, Jaykumar Gade
PURPOSE: The purpose of this research was to compare stress distribution on the bone between single implant-retained and two-implant-retained mandibular overdentures using three-dimensional (3D) finite element analysis. MATERIALS AND METHODS: Two 3D finite element models were designed. The first model included single implant-supported mandibular overdenture placed in the midline of the mandible while the second model included two-implant-supported mandibular overdenture placed in the intra-foramen region, retained by ball attachment of the same diameter...
November 2016: Indian Journal of Dental Research: Official Publication of Indian Society for Dental Research
https://www.readbyqxmd.com/read/28161602/characterizing-mandibular-growth-using-three-dimensional-imaging-techniques-and-anatomic-landmarks
#11
Michael P Kelly, Houri K Vorperian, Yuan Wang, Katelyn K Tillman, Helen M Werner, Moo K Chung, Lindell R Gentry
OBJECTIVE: To provide quantitative data on the multi-planar growth of the mandible, this study derived accurate linear and angular mandible measurements using landmarks on three dimensional (3D) mandible models. This novel method was used to quantify 3D mandibular growth and characterize the emergence of sexual dimorphism. DESIGN: Cross-sectional and longitudinal imaging data were obtained from a retrospective computed tomography (CT) database for 51 typically developing individuals between the ages of one and nineteen years...
January 23, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28157492/accuracy-of-computer-assisted-template-guided-autotransplantation-of-teeth-with-custom-three-dimensional-designed-printed-surgical-tooling-a-cadaveric-study
#12
David Anssari Moin, Jop Pieter Verweij, Hugo Waars, Richard van Merkesteyn, Daniel Wismeijer
PURPOSE: The aim of the present cadaveric study was to assess the accuracy of computer-assisted template-guided autotransplantation of teeth with custom 3-dimensional (3D) designed/printed surgical tooling. MATERIALS AND METHODS: Ten partially edentulous human mandibular cadavers were scanned using a cone-beam computed tomography (CBCT) system and an intraoral scanning system. The 3D data of these cadavers were imported to specialized software and used to analyze the region of the recipient sites, and the donor teeth were selected...
January 9, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28142072/modeling-dental-implant-insertion
#13
A Dorogoy, D Rittel, K Shemtov-Yona, R Korabi
The success of dental implantation is connected with the so-called implant primary stability, a synonym for the implant anchoring inside the bone. The primary stability is related to the applied peak torque to the implant during the insertion process. This work simulates the process of insertion of a typical commercial implant into the jaw bone (mandible) using a 3D dynamic non-linear finite-elements software. The model considers the geometrical and mechanical properties of the implant, the bone-implant friction, and the insertion procedure parameters, namely angular velocity and normal load...
January 21, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28137635/in-silico-analysis-of-the-biomechanical-stability-of-commercially-pure-ti-and-ti-15mo-plates-for-the-treatment-of-mandibular-angle-fracture
#14
Satoshi Yamaguchi, Rodolfo B Anchieta, Fernando P S Guastaldi, Nick Tovar, Daisuke Tawara, Satoshi Imazato, Paulo G Coelho
PURPOSE: To investigate the influence of different materials and fixation methods on maximum principal stress (MPS) and displacement in reconstruction plates using in silico 3-dimensional finite element analysis (3D-FEA). MATERIALS AND METHODS: Computer-assisted designed (CAD) models of the mandible and teeth were constructed. Champy and AO/ASIF plates and fixation screws were designed with CAD software. 3D-FEA was performed by image-based CAE software. Maximum and minimum values of biomechanical stability, MPS, and displacement distribution were compared in Champy and AO/ASIF plates made from commercially pure titanium grade 2 (cp-Ti) and a titanium-and-molybdenum (14...
January 4, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28134638/a-morphological-classification-scheme-for-the-mandibular-hypoplasia-in-treacher-collins-syndrome
#15
Cassandra A Ligh, Jordan Swanson, Jason W Yu, Fares Samra, Scott P Bartlett, Jesse A Taylor
BACKGROUND: Mandibular hypoplasia is a hallmark of Treacher Collins syndrome (TCS), and its severity accounts for significant functional morbidity. The purpose of this study is to develop a mandibular classification scheme. METHODS: A classification scheme was designed based on three-dimensional computed tomography (3D-CT) scans to assess 3 characteristic features: degree of condylar hypoplasia, mandibular plane angle (condylion-gonion-menton), and degree of retrognathia (sella-nasion-B point angle)...
January 27, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28128638/evaluation-of-the-diagnostic-efficacy-of-two-cone-beam-computed-tomography-protocols-in-reliably-detecting-the-location-of-the-inferior-alveolar-nerve-canal
#16
Aditya Tadinada, Sydney Schneider, Sumit Yadav
OBJECTIVES: Reliable three-dimensional localization of the inferior alveolar nerve canal (IANC) is valuable for a variety of dentoalveolar procedures. Although conventional CBCT offers three-dimensional information at a reasonably low dose, it is still a significant amount of radiation. In this ex vivo study, we evaluated the ability of a 180° rotational CBCT acquisition protocol with lower number of basis projections to create a CBCT data set for reliable localization of the IANC compared with a conventional 360° rotational CBCT acquisition...
March 13, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28123482/model-identification-of-stomatognathic-muscle-system-activity-during-mastication
#17
Edward Kijak, Jerzy Margielewicz, Danuta Lietz-Kijak, Katarzyna Wilemska-Kucharzewska, Marek Kucharzewski, Zbigniew Śliwiński
The present study aimed to determine the numeric projection of the function of the mandible and muscle system during mastication. An experimental study was conducted on a healthy 47 year-old subject. On clinical examination no functional disorders were observed. To evaluate the activity of mastication during muscle functioning, bread cubes and hazelnuts were selected (2 cm(2) and 1.2/1.3 cm in diameter, respectively) for condyloid processing. An assessment of the activity of mastication during muscle functioning was determined on the basis of numeric calculations conducted with a novel software programme, Kinematics 3D, designed specifically for this study...
January 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28086998/evaluation-of-artifacts-generated-by-zirconium-implants-in-cone-beam-computed-tomography-images
#18
Taruska Ventorini Vasconcelos, Boulos B Bechara, Clyde Alex McMahan, Deborah Queiroz Freitas, Marcel Noujeim
OBJECTIVE: To evaluate zirconium implant artifact production in cone beam computed tomography images obtained with different protocols. STUDY DESIGN: One zirconium implant was inserted in an edentulous mandible. Twenty scans were acquired with a ProMax 3D unit (Planmeca Oy, Helsinki, Finland), with acquisition settings ranging from 70 to 90 peak kilovoltage (kVp) and voxel sizes of 0.32 and 0.16 mm. A metal artifact reduction (MAR) tool was activated in half of the scans...
February 2017: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
https://www.readbyqxmd.com/read/28071714/three-dimensional-surgical-simulation-improves-the-planning-for-correction-of-facial-prognathism-and-asymmetry-a-qualitative-and-quantitative-study
#19
Cheng-Ting Ho, Hsiu-Hsia Lin, Eric J W Liou, Lun-Jou Lo
Traditional planning method for orthognathic surgery has limitations of cephalometric analysis, especially for patients with asymmetry. The aim of this study was to assess surgical plan modification after 3-demensional (3D) simulation. The procedures were to perform traditional surgical planning, construction of 3D model for the initial surgical plan (P1), 3D model of altered surgical plan after simulation (P2), comparison between P1 and P2 models, surgical execution, and postoperative validation using superimposition and root-mean-square difference (RMSD) between postoperative 3D image and P2 simulation model...
January 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28063377/finite-element-analysis-of-post-dental-implant-fixation-in-drilled-mandible-sites
#20
Adel Pirjamalineisiani, Mohsen Sarafbidabad, Nima Jamshidi, Fatemeh Abedi Esfahani
BACKGROUND: Implant loosening may occur after dental implant placement as a result of the mechanical conditions created around the implant. In this research, the effect of bone drilling conditions on the magnitude of stress created in newly-formed bone around the implant, after placement, was investigated using FEA analysis. METHOD: The simulations performed in this study were based on the three-dimensional (3D) shape of the created cavities, extracted from the drilled cortical bone of the jaws...
February 1, 2017: Computers in Biology and Medicine
keyword
keyword
69580
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"