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https://www.readbyqxmd.com/read/28414986/modelling-dental-implant-extraction-by-pullout-and-torque-procedures
#1
D Rittel, A Dorogoy, K Shemtov-Yona
Dental implants extraction, achieved either by applying torque or pullout force, is used to estimate the bone-implant interfacial strength. A detailed description of the mechanical and physical aspects of the extraction process in the literature is still missing. This paper presents 3D nonlinear dynamic finite element simulations of a commercial implant extraction process from the mandible bone. Emphasis is put on the typical load-displacement and torque-angle relationships for various types of cortical and trabecular bone strengths...
April 11, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28414870/three-dimensional-skeletal-mandibular-changes-associated-with-herbst-appliance-treatment
#2
B Q Souki, P L C Vilefort, D D Oliveira, I Andrade, A C Ruellas, M S Yatabe, T Nguyen, L Franchi, J A McNamara, L H S Cevidanes
OBJECTIVES: Three-dimensional evaluation of skeletal mandibular changes following Herbst appliance treatment. SETTING AND SAMPLE POPULATION: Retrospective case-control study, based on a sample size calculation. Twenty-five pubertal patients treated with Herbst appliance (HAG), and 25 matched Class II patients who received other non-orthopaedic dental treatments (CG). MATERIAL AND METHODS: Three-dimensional models were generated from pre-treatment (T0) and post-treatment (T1) cone beam computed tomograms...
May 2017: Orthodontics & Craniofacial Research
https://www.readbyqxmd.com/read/28409207/the-precise-repositioning-instrument-for-genioplasty-and-a-three-dimensional-printing-technique-for-treatment-of-complex-facial-asymmetry
#3
Lin Wang, Dan Tian, Xiumei Sun, Yanju Xiao, Li Chen, Guomin Wu
BACKGROUND: Facial asymmetry is very common in maxillofacial deformities. It is difficult to achieve accurate reconstruction. With the help of 3D printing models and surgical templates, the osteotomy line and the amount of bone grinding can be accurate. Also, by means of the precise repositioning instrument, the repositioning of genioplasty can be accurate and quick. In this study, we present a three-dimensional printing technique and the precise repositioning instrument to guide the osteotomy and repositioning, and illustrate their feasibility and validity...
April 13, 2017: Aesthetic Plastic Surgery
https://www.readbyqxmd.com/read/28392810/effect-of-exposure-parameters-on-metal-artifacts-in-cone-beam-computed-tomography
#4
Mehrdad Panjnoush, Yasaman Kheirandish, Pooneh Mohseni Kashani, Hoorieh Bashizadeh Fakhar, Farzan Younesi, Maysa Mallahi
OBJECTIVES: The aim of this study was to assess the effect of tube current, kilovoltage peak (kVp), metal type, and the position of metal objects on metal artifacts in cone-beam computed tomography (CBCT) images. MATERIALS AND METHODS: Titanium and cobalt-chromium rods were fabricated and placed in a dry human mandible. Samples were scanned using a Promax 3D CBCT unit with different milli-amperages and kVp. The artifacts induced by metal objects were evaluated using the Image J software in four regions of interest (ROIs) on each image...
June 2016: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/28390760/restricted-mandibular-movement-attributed-to-ossification-of-mandibular-depressors-and-medial-pterygoid-muscles-in-patients-with-fibrodysplasia-ossificans-progressiva-a-report-of-3-cases
#5
Tetsuko Okuno, Hitoshi Suzuki, Akio Inoue, Jingo Kusukawa
Fibrodysplasia ossificans progressiva (FOP) is an extremely rare genetic condition characterized by congenital malformation and progressive heterotopic ossification (HO) caused by a recurrent single nucleotide substitution at position 617 in the ACVR1 gene. As the condition progresses, HO leads to joint ankylosis, breathing difficulties, and mouth-opening restriction, and it can shorten the patient's lifespan. This report describes 3 cases of FOP confirmed by genetic testing in patients with restricted mouth opening...
March 16, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28384972/comparison-of-cone-beam-computed-tomography-and-multi-slice-computed-tomography-image-quality-of-human-dried-mandible-using-10-anatomical-landmarks
#6
Samira Saati, Fatemeh Kaveh, Shiva Yarmohammadi
INTRODUCTION: Cone Beam Computed Tomography (CBCT) has gained a broad acceptance in dentomaxillofacial imaging. Computed Tomography (CT) is another imaging modality for diagnosis and preoperative assessments of the head and neck region. AIM: Considering the increased radiation exposure and high cost of CT, this study sought to subjectively assess the image quality of CBCT and Multi Slice CT (MSCT). MATERIALS AND METHODS: A dry human mandible was scanned by five CBCT systems (New Tom 3G, Scanora, CRANEX 3D, Promax and Galileos) and one MSCT system...
February 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28381373/the-use-of-patient-specific-implants-in-orthognathic-surgery-a-series-of-30-mandible-sagittal-split-osteotomy-patients
#7
Juho Suojanen, Junnu Leikola, Patricia Stoor
PURPOSE: Virtual surgery combined with patient-specific saw and drill guides and osteosynthesis materials are rapidly spreading from reconstructive surgery to orthognathic surgery. Most commercial partners are already providing computer-aided design and computer-aided manufacture (CAD/CAM) wafers and patient-specific saw guides. Clear benefits have been demonstrated for custom-made drill guides combined with individually designed three-dimensional (3D) printed patient-specific implants (PSI) as a reposition and fixation system in Le Fort I osteotomy...
March 3, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28365396/use-of-the-3d-surgical-modelling-technique-with-open-source-software-for-mandibular-fibula-free-flap-reconstruction-and-its-surgical-guides
#8
L Ganry, B Hersant, J Quilichini, P Leyder, J P Meningaud
INTRODUCTION: Tridimensional (3D) surgical modelling is a necessary step to create 3D-printed surgical tools, and expensive professional software is generally needed. Open-source software are functional, reliable, updated, may be downloaded for free and used to produce 3D models. Few surgical teams have used free solutions for mastering 3D surgical modelling for reconstructive surgery with osseous free flaps. We described an Open-source software 3D surgical modelling protocol to perform a fast and nearly free mandibular reconstruction with microvascular fibula free flap and its surgical guides, with no need for engineering support...
March 29, 2017: Journal of Stomatology, Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28359687/comparison-of-the-adult-three-dimensional-craniofacial-features-of-patients-with-unilateral-craniofacial-microsomia-with-and-without-early-mandible-distraction
#9
E W-C Ko, P K-T Chen, L-J Lo
This study was conducted to analyze the long-term facial growth of patients with craniofacial microsomia (CFM) after early mandible distraction osteogenesis (DO), and compared adult three-dimensional (3D) craniofacial features of patients with and without early mandibular DO for Pruzansky grade II deformities. The study included 20 patients: 9 with early mandible DO (the DO group) and 11 without previous treatment (the NDO group). Longitudinal radiographs were measured for growth changes after DO. The 3D craniofacial images were constructed to compare the craniofacial forms between the two groups...
March 27, 2017: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28350523/comparison-of-micro-ct-and-cone-beam-ct-on-the-feasibility-of-assessing-mandibular-trabecular-structures-in-mandibular-condyle
#10
Xin Liang, Zuyan Zhang, Jianping Gu, Zhihui Wang, Bart Vandenberghe, Reinhilde Jacobs, Jie Yang, Guowu Ma, Haibin Ling, Xuchen Ma
OBJECTIVES: To evaluate the accuracy of Cone-beam CT (CBCT) in assessing trabecular structures Methods: Two human mandibles were scanned by micro-CT (Skyscan 1173 high energy spiral scan micro-CT, Skyscan NV, Kontich, Belgium) and CBCT(3D Accuitomo 170, Morita Japan). The CBCT images were reconstructed in 0.5mm and 1 mm thickness. The condylar images were selected for registration. A parallel algorithm for histogram computation was introduced to perform the registration. Mutual information (MI) value was used to evaluate the match between the images obtained from micro-CT and CBCT...
March 28, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28337564/lower-face-cephalometry-based-on-quadrilateral-analysis-with-cone-beam-computed-tomography-a-clinical-pilot-study
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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