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3D mandible

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https://www.readbyqxmd.com/read/29040460/effect-of-different-masticatory-functional-demands-on-the-3d-mandibular-condyle-morphology-of-growing-rats-using-posterior-bite-blocks
#1
Balazs J Denes, Benjamin Lazzarotto, Andrea Bresin, Stavros Kiliaridis
Background and objectives: Apart from the primary effect of bite-blocks on tooth position, they may also influence the mandibular condylar growth. Our aim was to investigate their influence on the condylar morphology, with variable masticatory forces. Material and methods: Fifty-two 4-week old male rats were divided into hard and soft diet groups in order to create individuals with different masticatory muscle capacity. Two weeks later, they were equally divided into bite-block and control groups...
October 11, 2017: European Journal of Orthodontics
https://www.readbyqxmd.com/read/29031529/enhanced-surgical-outcomes-in-patients-with-skeletal-class-iii-facial-asymmetry-by-3-dimensional-surgical-simulation
#2
Ellen Wen-Ching Ko, Cheng-Hui Lin, Ying-An Chen, Yu-Ray Chen
PURPOSE: With the advance of image fusion techniques, the creation of 3-dimensional (3D) virtual head and 3D surgical simulations has provided previews of surgical procedures. The aim of this study was to investigate the surgical outcomes in patients receiving orthognathic surgery (OGS) with the guidance of 3D computer-assisted surgical simulation. PATIENTS AND METHODS: The study included 34 consecutive patients (15 men and 19 women; age, 18.1 to 33.0 yr) with skeletal Class III facial asymmetry who underwent bimaxillary OGS...
September 19, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29019277/3d-cbct-morphometric-assessment-of-mental-foramen-in-arabic-population-and-global-comparison-imperative-for-invasive-and-non-invasive-procedures-in-mandible
#3
Mohammad Khursheed Alam, Selham Alhabib, Bader K Alzarea, Muhammad Irshad, Saif Faruqi, Mohd G Sghaireen, Santosh Patil, Rehana Basri
BACKGROUND: Recent advancements in clinical dentistry have increased the possibilities of surgical procedures in the mental region. A detailed knowledge of mental foramen (MF) morphometry is significant to preserve integrity of the mental nerve trunk in surgical interventions such as orthognathic surgery, implant placement and anaesthetic block. OBJECTIVE: The aim of this study was to determine the most accurate position of the mental foramen by using new assessment approach in a sample of dental patients presenting to the specialist dental clinic, College of Dentistry, Al Jouf University, Saudi Arabia...
October 11, 2017: Acta Odontologica Scandinavica
https://www.readbyqxmd.com/read/28987534/talking-heads-morphological-variation-in-the-human-mandible-over-the-last-500-years-in-the-netherlands
#4
A M Bosman, S R Moisik, D Dediu, A Waters-Rist
The primary aim of this paper is to assess patterns of morphological variation in the mandible to investigate changes during the last 500 years in the Netherlands. Three-dimensional geometric morphometrics is used on data collected from adults from three populations living in the Netherlands during three time-periods. Two of these samples come from Dutch archaeological sites (Alkmaar, 1484-1574, n=37; and Middenbeemster, 1829-1866, n=51) and were digitized using a 3D laser scanner. The third is a modern sample obtained from MRI scans of 34 modern Dutch individuals...
August 24, 2017: Homo: Internationale Zeitschrift Für die Vergleichende Forschung Am Menschen
https://www.readbyqxmd.com/read/28968334/three-dimensional-reconstruction-of-the-distribution-of-neurons-contributing-to-ophthalmic-maxillary-and-mandibular-nerves-in-the-trigeminal-ganglion-of-experimental-model
#5
Wenbin Wei, Zixiang Han, Minjie Chen, Weijie Zhang, Ying Chai, Yiwen Wang, Wenhao Zhang
The authors introduce a new method to build a three-dimensional (3D) model of the 3 branches of the trigeminal nerve in the trigeminal ganglion of rabbit with 3 different kinds of fluorescence. Ten adult New Zealand rabbits of both sexes weighing between 2.0 and 3.0 kg were used in the experiment. Then through an operation under general anesthesia, the maxillary and mandibular nerves were exposed, and red and gold fluorescence were applied to investigate the neurons of the maxillary and mandibular nerves...
September 29, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28964289/three-dimensional-assessment-of-the-temporal-bone-and-mandible-deformations-in-patients-with-congenital-aural-atresia
#6
Yaoyao Fu, Chenlong Li, Peidong Dai, Tianyu Zhang
OBJECTIVE: To investigate the deformations of temporal bone and mandible combined with congenital aural atresia. METHODS: A total of 158 patients with congenital aural atresia were included in the study. The raw CT data of the temporal bone was imported into MIMICS v 12 and threshold dissection, region growing and three-dimensional (3D) calculation were used to calculate 3D models. The 3D characteristics of the temporal bone and upper part of mandible were assessed...
October 2017: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/28960842/accuracy-and-reliability-of-landmark-based-surface-based-and-voxel-based-3d-cone-beam-computed-tomography-superimposition-methods
#7
A Ghoneima, H Cho, K Farouk, K Kula
OBJECTIVES: To evaluate and compare the accuracy and reliability of 3 different methods of three-dimensional cone-beam computed tomography scans (3D CBCTs) superimpositions: landmark-based, surface-based and voxel-based. MATERIALS AND METHODS: Pre- and post-orthodontic treatment CBCTs (T1 and T2) of 20 subjects with a mean age of 11 years were obtained. Seven points on the zygomatic arch and supraorbital region were selected to perform landmark-based superimposition...
September 27, 2017: Orthodontics & Craniofacial Research
https://www.readbyqxmd.com/read/28952598/finite-element-simulation-and-additive-manufacturing-of-stiffness-matched-niti-fixation-hardware-for-mandibular-reconstruction-surgery
#8
Ahmadreza Jahadakbar, Narges Shayesteh Moghaddam, Amirhesam Amerinatanzi, David Dean, Haluk E Karaca, Mohammad Elahinia
Process parameters and post-processing heat treatment techniques have been developed to produce both shape memory and superelastic NiTi using Additive Manufacturing. By introducing engineered porosity, the stiffness of NiTi can be tuned to the level closely matching cortical bone. Using additively manufactured porous superelastic NiTi, we have proposed the use of patient-specific, stiffness-matched fixation hardware, for mandible skeletal reconstructive surgery. Currently, Ti-6Al-4V is the most commonly used material for skeletal fixation devices...
December 19, 2016: Bioengineering
https://www.readbyqxmd.com/read/28950180/facial-skeleton-asymmetry-and-its-relationship-to-mastication-in-the-early-medieval-period-great-moravian-empire-mikul%C3%A4-ice-9th-10th-century
#9
Alexandra Ibrová, Ján Dupej, Petra Stránská, Petr Velemínský, Lumír Poláček, Jana Velemínská
OBJECTIVES: The aim of this study was to analyse the relationship of mastication and directional asymmetry (DA) of upper facial skeleton in Early Medieval sample from the Mikulčice settlement (Czech Republic). DESIGN: The settlement is divided into two burial areas of presumably different socioeconomic status: the castle and the sub-castle. The material consisted of 193 individuals (125 castle, 68 sub-castle). The relationship of facial skeleton DA and mastication was analysed by examining tooth wear and mandibular shape by means of 3D geometric morphometrics...
September 19, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28938321/the-pierre-robin-mandible-is-hypoplastic-and-morphologically-abnormal
#10
Elizabeth G Zellner, Russell R Reid, Derek M Steinbacher
BACKGROUND: For Pierre Robin sequence (PRS) patients, there is incomplete characterization of 3D differences and effects of mandibular distraction osteogenesis (MDO) on the mandible compared to normal controls. METHODS: PRS infants who underwent MDO at 2 craniofacial referral centerals with pre- and postoperative computed tomography (CT) scans were identified. A group of age-matched control patients with CTs were identified in the PACS database. Demographic and perioperative data were recorded...
September 21, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28935486/the-effects-of-surgically-assisted-rapid-maxillary-expansion-sarme-on-the-dental-show-and-chin-projection
#11
Tong Xi, Magdalena Laskowska, Neeltje van de Voort, Hossein Ghaeminia, Wojciech Pawlak, Stefaan Bergé, Thomas Maal
OBJECTIVE: To quantify the postoperative changes of the dental show and chin projection following SARME using 3D CBCT imaging. MATERIAL AND METHODS: 78 patients with transversal maxillary hypoplasia and mandibular hypoplasia who underwent SARME were enrolled into the study. A cone beam computed tomography (CBCT) scan was acquired preoperatively and at least 1 year postoperatively. 3D postoperative changes in the dental show and pogonion position were measured based on soft tissue and hard tissue landmarks...
August 31, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28894837/dental-occlusion-ties-a-rapid-safe-and-non-invasive-maxillo-mandibular-fixation-technology
#12
Alan W Johnson
OBJECTIVES: For decades, Erich arch bars have been a standard in establishing maxillo-mandibular fixation (MMF). While reliable, the approach risks sharps injury, consumes operating room time, and inflicts gingival trauma. Newer technologies including screw-based techniques and "hybrid" techniques have improved MMF by reducing sharps injuries and operating room time, but risk injury to tooth roots, nerves, and gingiva. This study aims to establish the application, strengths, and limitations of dental occlusion ties as a novel alternative in maxillo-mandibular fixation...
August 2017: Laryngoscope Investigative Otolaryngology
https://www.readbyqxmd.com/read/28891902/nasal-deviation-in-patients-with-asymmetric-mandibular-prognathism
#13
Young-Min Shin, Sung-Tak Lee, Ki-Young Nam, Tae-Geon Kwon
PURPOSE: This study was aimed to evaluate the nasal deviation in patients with asymmetric mandibular prognathism. MATERIALS AND METHODS: Thirty-five patients with skeletal class III malocclusion were included in the study. Significant mandibular asymmetry of >4 mm menton deviation in three-dimensional (3D) reformatted cone beam computed tomography images was defined as asymmetry group (n = 20). Patients without mandibular asymmetry served as control group (n = 15)...
October 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28884971/testing-the-face-shape-hypothesis-in-twins-discordant-for-nonsyndromic-orofacial-clefting
#14
Jasmien Roosenboom, Karlijne Indencleef, Greet Hens, Hilde Peeters, Kaare Christensen, Mary L Marazita, Peter Claes, Elizabeth J Leslie, Seth M Weinberg
Nonsyndromic orofacial clefts (OFCs) are complex traits characterized by multifactorial inheritance and wide phenotypic variability. Numerous studies have shown subtle differences in the faces of unaffected relatives from cleft families compared to controls, the implication being that such outward differences are an incomplete expression reflecting an underlying genetic predisposition. Twins discordant for OFCs provide a unique opportunity to further test this idea, as the unaffected co-twin shares on average 50% (for dizygotic twins) and 100% (for monozygotic twins) of the genetic risk factors as the affected twin...
September 8, 2017: American Journal of Medical Genetics. Part A
https://www.readbyqxmd.com/read/28882499/secondary-surgical-management-of-osteoradionecrosis-using-three-dimensional-isodose-curve-visualization-a-report-of-three-cases
#15
J Kraeima, R J H M Steenbakkers, F K L Spijkervet, J L N Roodenburg, M J H Witjes
Osteoradionecrosis is defined as bone death secondary to radiotherapy. There is a relationship between the radiation dose received and the occurrence of osteoradionecrosis of the jaws, with the risk increasing above a dose of 60Gy. In cases of class III mandibular osteoradionecrosis, a segmental resection can be indicated. Current practice is to completely remove the affected bone up to the point where the bone looks healthy and is bleeding. Exact resection planning and the use of guided surgery based on imaging of the bone changes have not been reported so far...
September 4, 2017: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28869633/optimal-selection-of-dental-implant-for-different-bone-conditions-based-on-the-mechanical-response
#16
Sandipan Roy, Mainak DAS, Pratyaya Chakraborty, Jayanta Kumar Biswas, Subhomoy Chatterjee, Niloy Khutia, Subrata Saha, Amit Roy Chowdhury
PURPOSE: Bone quality varies from one patient to another extensively. Young's modulus may deviate up to 40% of normal bone quality, which results into alteration of bone stiffness immensely. The prime goal of this study is to design the optimum dental implant considering the mechanical response at bone implant interfaces for a patient with specific bone quality. METHOD: 3D models of mandible and natural molar tooth were prepared from CT scan data, while dental implants were modelled using different diameter, length and porosity and FE analysis was carried out...
2017: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/28866146/rehabilitation-of-the-atrophic-mandible-with-short-implants-in-different-positions-a-finite-elements-study
#17
Hugo E Peixoto, Paulo R Camati, Fernanda Faot, Bruno S Sotto-Maior, Elizabeth F Martinez, Daiane C Peruzzo
OBJECTIVE: The aim of this study was to analyze whether the use of inclined short implants without lower transcortical involvement (test model - SI), thus preserving the mandibular lower cortical bone, could optimize stress distribution. MATERIALS AND METHODS: Six identical atrophic mandible models were created featuring 8mm of height at the symphysis. Two study factors were evaluated: implant length and angulation. Implant length was represented either by short implants (7mm) with preservation of the mandibular lower cortical bone or standard implants (9mm) with a bicortical approach and 3 possible implant positioning configurations: 4 distally-inclined implants at 45° (experimental model), all-on-four, 4 vertical implants...
November 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28865846/application-of-a-newly-designed-mandibular-distraction-device-for-navigation-surgery-in-goats
#18
Ming Cai, Yang Chen, Xiaofeng Lu, Lei Xu, Xudong Wang, Guofang Shen
PURPOSE: This animal study is to investigate the accuracy of navigation-guided mandibular distraction osteogenesis with a special designed distraction device by TBNavis-CMFS navigation system. MATERIALS AND METHODS: Four goats were included in this study. The 3D simulation unilateral mandibular distraction osteogenesis was simulated for 14 mm lengthening in TBNavis-CMFS navigation system. A new designed mandibular distraction device with the detachable adapter for navigation surgery in combination with the specific mandibular dynamic reference frame was applied...
October 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28855872/a-novel-method-to-detect-3d-mandibular-changes-related-to-soft-diet-feeding
#19
Kana Kono, Chihiro Tanikawa, Takeshi Yanagita, Hiroshi Kamioka, Takashi Yamashiro
Craniofacial morphology varies among individuals, which is regulated by the interaction between genes and the environment. Soft-diet feeding is a widely-used experimental model for studying the association between the skeletal morphology and muscle-related loading on the bone. Traditionally, these studies have been based on linear and angular measurements provided on two-dimensional (2D) radiographs in the lateral view. However, 2D observation is based on simplification of the anatomical structures and cannot detect three-dimensional (3D) changes in detail...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28842717/three-dimensional-geometric-morphometric-analysis-of-fossil-canid-mandibles-and-skulls
#20
Abby Grace Drake, Michael Coquerelle, Pavel A Kosintsev, Olga P Bachura, Mikhail Sablin, Andrei V Gusev, Lacey S Fleming, Robert J Losey
Much of the fossil record for dogs consists of mandibles. However, can fossil canid mandibles be reliably identified as dogs or wolves? 3D geometric morphometric analysis correctly classifies 99.5% of the modern dog and wolf mandibles. However, only 4 of 26 Ust'-Polui fossil mandibles, a Russian Arctic site occupied from 250BCE to 150CE, were identified as dogs and none of the 20 Ivolgin mandibles, an Iron Age site in southern Russia, were identified as dogs. Three of the Ust'-Polui mandibles and 8 of the Ivolgin mandibles were identified as wolves...
August 25, 2017: Scientific Reports
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