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https://www.readbyqxmd.com/read/27921118/can-different-occlusal-positions-instantaneously-impact-spine-and-body-posture-a-pilot-study-using-rasterstereography-for-a-three-dimensional-evaluation
#1
Karoline März, Werner Adler, Ragai-Edward Matta, Linda Wolf, Manfred Wichmann, Bastian Bergauer
PURPOSE: Orthodontists influence dental occlusion directly. To suggest any link between dental occlusion and body posture is highly contentious, as evidenced by the literature. Rasterstereography, an optical technique that enables three-dimensional (3D) body measurements to be collected, has not yet been used to impartially examine whether different occlusal positions could instantaneously alter spine and body posture. We therefore set out to use this technique to nonsubjectively evaluate this question under static conditions...
December 5, 2016: Journal of Orofacial Orthopedics, Fortschritte der Kieferorthopädie
https://www.readbyqxmd.com/read/27896211/comparison-of-postoperative-changes-in-the-distal-and-proximal-segments-between-conventional-and-sliding-mini-plate-fixation-following-mandibular-setback
#2
Seong-Sik Kim, Kyoung-Ho Kwak, Ching-Chang Ko, Soo-Byung Park, Woo-Sung Son, Yong-Il Kim
OBJECTIVE: The purpose of the present study was to evaluate the postoperative three-dimensional (3D) changes in the proximal segments after mandibular setback sagittal split ramus osteotomy and to compare the changes between the conventional mini-plate fixation and semi-rigid sliding plate fixation. METHODS: Cone-beam computed tomography (CBCT) images were used to evaluate the postoperative 3D changes in the proximal segments during the healing process. CBCT images were superimposed using the symphysis and the lower anterior mandible as references...
November 2016: Korean Journal of Orthodontics
https://www.readbyqxmd.com/read/27878463/tracking-of-the-inferior-alveolar-nerve-its-implication-in-surgical-planning
#3
Jimoh O Agbaje, Elke Van de Casteele, Ahmed S Salem, Dickson Anumendem, Ivo Lambrichts, Constantinus Politis
OBJECTIVES: The objective of the study is to assess the correlation between the mandibular canal tracing done on cone beam CT (CBCT) data, with the size, shape, and position of the neurovascular bundle (NB) obtained by magnetic resonance imaging (MRI). MATERIAL AND METHODS: Six human cadaver mandibles were scanned with a CBCT Promax® scanner (Planmeca, Helsinki, Finland) and with an Ingenia® 3.0 T MR system (Philips, Amsterdam, The Netherlands). The NB was segmented from the MRI dataset, while the mandibular canal (MC) tracing was done on the CBCT images...
November 22, 2016: Clinical Oral Investigations
https://www.readbyqxmd.com/read/27853498/dosimetry-of-three-cone-beam-computerized-tomography-scanners-at-different-fields-of-view-in-terms-of-various-head-and-neck-organs
#4
Sima Nikneshan, Mahmood Reza Aghamiri, Ehsan Moudi, Nika Bahemmat, Hoora Hadian
BACKGROUND: Marketing new radiography devices necessitates documenting their absorbed X-ray doses. Since the current literature lacks studies on new devices, we assessed the doses of two new devices that had not previously been assessed. OBJECTIVES: The new devices were compared to the Promax three dimensional (3D) scanner at two fields of view (FOV) in nine critical head and neck tissues and organs. MATERIALS AND METHODS: Seventeen thermoluminescence dosimeters positioned in an average-sized male RANDO phantom were used to determine the dosimetry of the three cone beam computerized tomography devices (NewTom VGi, NewTom 5G, and Promax 3D) at two field of views (FOVs), one small and one large...
July 2016: Iranian Journal of Radiology: a Quarterly Journal Published By the Iranian Radiological Society
https://www.readbyqxmd.com/read/27833286/diagnostic-tools-in-maxillofacial-fractures-is-there-really-a-need-of-three-dimensional-computed-tomography
#5
Sheerin Shah, Sanjeev K Uppal, Rajinder K Mittal, Ramneesh Garg, Kavita Saggar, Rishi Dhawan
INTRODUCTION: Because of its functional and cosmetic importance, facial injuries, especially bony fractures are clinically very significant. Missed and maltreated fractures might result in malocclusion and disfigurement of the face, thus making accurate diagnosis of the fracture very essential. In earlier times, conventional radiography along with clinical examination played a major role in diagnosis of maxillofacial fractures. However, it was noted that the overlapping nature of bones and the inability to visualise soft tissue swelling and fracture displacement, especially in face, makes radiography less reliable and useful...
May 2016: Indian Journal of Plastic Surgery: Official Publication of the Association of Plastic Surgeons of India
https://www.readbyqxmd.com/read/27815013/mandibular-reconstruction-after-cancer-an-in-house-approach-to-manufacturing-cutting-guides
#6
R Bosc, B Hersant, R Carloni, J Niddam, J Bouhassira, H De Kermadec, E Bequignon, T Wojcik, M Julieron, J-P Meningaud
The restoration of mandibular bone defects after cancer can be facilitated by computer-assisted preoperative planning. The aim of this study was to assess an in-house manufacturing approach to customized cutting guides for use in the reconstruction of the mandible with osteocutaneous free flaps. A retrospective cohort study was performed, involving 18 patients who underwent mandibular reconstruction with a fibula free flap at three institutions during the period July 2012 to March 2015. A single surgeon designed and manufactured fibula and mandible cutting guides using a computer-aided design process and three-dimensional (3D) printing technology...
November 1, 2016: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/27786556/high-resolution-mri-of-the-mandibular-canal-at-1-5t-a-comparison-of-gradient-and-spin-echo-sequences
#7
Jakob Kreutner, Andreas Hopfgartner, Daniel Weber, Julian Boldt, Kurt Rottner, Ernst Richter, Peter Michael Jakob, Daniel Haddad
OBJECTIVES: The precision of localizing the mandibular canal prior to surgical intervention depends on the achievable resolution, while identification of the nerve depends on the image contrast. In our study we developed new protocols based on gradient and spin echo sequences. The results from both sequences were quantitatively compared for their agreement to identify the most suitable approach. METHODS: By limiting the field of view to one side of the mandible, 3D acquisitions with T1-weighted gradient and spin echo sequences were performed with 0...
October 27, 2016: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/27767348/rapid-3d-mandibular-superimposition-for-growing-patients
#8
Leonardo Koerich, André Weissheimer, Luciane Macedo de Menezes, Steven J Lindauer
OBJECTIVE: To evaluate the precision and reproducibility of a protocol to perform rapid voxel-based superimposition of the mandible in growing patients using CBCT. MATERIALS AND METHODS: The sample comprised two cone-beam computed tomography scans taken at least 1 year apart from each of 24 growing patients. Voxel-based superimposition was performed by two examiners independently. The internal part of the symphysis extending to the first molar was used as the reference...
October 21, 2016: Angle Orthodontist
https://www.readbyqxmd.com/read/27765335/the-effect-of-milliamperage-number-of-basis-images-and-export-slice-thickness-on-contrast-to-noise-ratio-and-detection-of-mandibular-canal-on-cone-beam-computed-tomography-scans-an-in%C3%A2-vitro-study
#9
Rujuta Katkar, Douglas D Steffy, Marcel Noujeim, S Thomas Deahl, Hassem Geha
OBJECTIVES: The aim of this study was to evaluate the effect of milliamperage, number of basis images, and export slice thickness on contrast-to-noise ratio (CNR) and confidence in detecting mandibular canal. STUDY DESIGN: Two phantoms were used. Each phantom consisted of a dry mandible with an epoxy resin bone tissue substitute block and a water-equivalent block, submerged in water. Each mandible was scanned with a Morita 3D Accuitomo cone beam computed tomography (CBCT) machine (Morita, Kyoto, Japan)...
November 2016: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
https://www.readbyqxmd.com/read/27761588/post-treatment-changes-in-permanent-retention
#10
Michael Wolf, U Schulte, K Küpper, C Bourauel, L Keilig, S N Papageorgiou, C Dirk, C Kirschneck, N Daratsianos, A Jäger
OBJECTIVES: While permanent retention is today the method of choice to stabilize orthodontic treatment outcomes, recent studies have increasingly reported posttreatment changes in tooth position during permanent retention. We conducted this study to analyze changes in the anterior mandible, whether the changes follow an underlying movement pattern, and, aiming for a preventive strategy, whether any risk factors could be identified comparing findings with the pretreatment situations. METHODS: We included 30 patients who had worn fixed Twistflex retainers (UK 3-3) extending from canine to canine in the mandible...
October 19, 2016: Journal of Orofacial Orthopedics, Fortschritte der Kieferorthopädie
https://www.readbyqxmd.com/read/27746405/computed-tomography-examination-and-mitochondrial-dna-analysis-of-japanese-wolf-skull-covered-with-skin
#11
Naotaka Ishiguro, Yasuo Inoshima, Motoki Sasaki
A Canis skull, right half of the mandible and part of the left half of the mandible were subjected to three-dimensional (3D) computed tomography (CT) observation and mitochondrial DNA (mtDNA) analysis in order to determine whether the specimens belonged to the extinct Japanese wolf, Canis lupus hodophilax (Temminck, 1839). Osteometric analysis of the skull and right half of the mandible revealed that the material (JW275) was indeed typical of the Japanese wolf. Sequence analysis of a 600-bp mtDNA region revealed that the JW275 belonged to haplotype Group B, which is characterized by an 8-bp deletion in the mtDNA control region...
October 15, 2016: Journal of Veterinary Medical Science
https://www.readbyqxmd.com/read/27713052/accuracy-of-virtually-3d-planned-resection-templates-in-mandibular-reconstruction
#12
Willem L J Weijs, Casper Coppen, Ruud Schreurs, Rinaldo D Vreeken, Arico C Verhulst, Matthias A W Merkx, Stefaan J Bergé, Thomas J J Maal
OBJECTIVE: Since reconstruction of composite defects in the head and neck region is a challenging and demanding problem for head and neck surgeons, surgical aids have been sought for decades. The purpose of this study was to evaluate the accuracy of prefabricated surgical resection templates used in mandibular segmental resections in comparison to the virtual surgical plan. MATERIALS AND METHODS: A prospective study was performed in 11 consecutive patients, with a primary T4 oral squamous cell carcinoma or osteoradionecrosis of the mandible...
November 2016: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/27615425/biomechanical-analysis-of-immediately-loaded-implants-according-to-the-all-on-four-concept
#13
Satoshi Horita, Tsutomu Sugiura, Kazuhiko Yamamoto, Kazuhiro Murakami, Yuichiro Imai, Tadaaki Kirita
PURPOSE: The purpose of this study was to investigate the biomechanical behavior of immediately loaded implants in an edentulous mandible according to the "All-on-Four" concept. METHODS: A 3D-finite element model of an edentulous mandible was constructed. Four implants were placed between the bilateral mental foramen according to "All-on-Four" concept. A framework made of titanium or acrylic resin between the bilateral first molars was modeled. Immediate loading and a delayed loading protocol were simulated...
September 5, 2016: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/27571364/comprehensive-analysis-of-mandibular-residual-asymmetry-after-bilateral-sagittal-split-ramus-osteotomy-correction-of-menton-point-deviation
#14
Han Lin, Ping Zhu, Qiuping Lin, Xiaoqiong Huang, Yue Xu, Xiaoping Yang
PURPOSE: Facial asymmetry often persists even after mandibular deviation corrected by the bilateral sagittal split ramus osteotomy (BSSRO) operation, since the reference facial sagittal plane for the asymmetry analysis is usually set up before the mandibular menton (Me) point correction. Our aim is to develop a predictive and quantitative method to assess the true asymmetry of the mandible after a midline correction performed by a virtual BSSRO, and to verify its availability by evaluation of the post-surgical improvement...
2016: PloS One
https://www.readbyqxmd.com/read/27563530/maxilla-nasion-mandible-mnm-angle-an-indicator-to-assess-fetal-facial-profile-in-first-trimester-of-pregnancy
#15
Wei Liu, Suhui Qu, Mujun Wang, Wanju Xu, Guangying Zhang, Chengqi Zhang
OBJECTIVE: The aim of this study was to observe whether there existed significant differences in the maxilla-nasion-mandible angle (MNM) between the first- and second-trimester of pregnancy, and to observe its predictive values for trisomy 18. METHODS: Two experienced ultrasonologists used 2D and 3D ultrasound imaging techniques to obtain the facial sagittal sections of fetuses in the first-trimester of pregnancy (crown-rump length 45-84 mm), respectively, so as to measure MNM...
2016: SpringerPlus
https://www.readbyqxmd.com/read/27563341/resolving-the-evolution-of-the-mammalian-middle-ear-using-bayesian-inference
#16
Héctor E Ramírez-Chaves, Vera Weisbecker, Stephen Wroe, Matthew J Phillips
BACKGROUND: The minute, finely-tuned ear ossicles of mammals arose through a spectacular evolutionary transformation from their origins as a load-bearing jaw joint. This involved detachment from the postdentary trough of the mandible, and final separation from the dentary through resorption of Meckel's cartilage. Recent parsimony analyses of modern and fossil mammals imply up to seven independent postdentary trough losses or even reversals, which is unexpected given the complexity of these transformations...
2016: Frontiers in Zoology
https://www.readbyqxmd.com/read/27548831/simultaneous-computer-aided-design-computer-aided-manufacture-bimaxillary-orthognathic-surgery-and-mandibular-reconstruction-using-selective-laser-sintered-titanium-implant
#17
Muhanad M Hatamleh, Gurprit Bhamrah, Francine Ryba, Gavin Mack, Chrisopher Huppa
This patient report describes simultaneous bimaxillary orthognathic surgery and mandibular reconstruction by means of three-dimensional (3D) planning, 3D printed biocompatible surgical wafers, and 3D selective-laser sintered titanium implant. A 26-year-old male patient presented with a left mandibular defect secondary to trauma. The whole body of the mandible on the left hand side was deficient with a narrow connection with the remaining left condyle. He had undergone orthodontic treatment for 18 months and was ready to undergo bimaxillary orthognathic surgery...
October 2016: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/27546868/potential-pitfalls-of-the-ptv-concept-in-dose-to-medium-planning-optimization
#18
E Sterpin
In typical treatment planning of 3D IMRT, the incident energy fluence is optimized to achieve a homogeneous dose distribution to the PTV. The PTV includes the tumour but also healthy tissues that may have a different dose response for the same incident energy fluence, like bony structures included in the PTV (mandibles in head and neck tumours or femoral bones in sarcomas). Dose to medium optimization compensates for this heterogeneous response, leading to a non-homogeneous energy fluence in the PTV and a non-homogeneous dose in the CTV in the presence of geometric errors...
September 2016: Physica Medica: PM
https://www.readbyqxmd.com/read/27544963/-di-paolo-s-cephalometrical-analysis-of-lower-face-by-means-of-cone-beam-ct
#19
Adrienn Dobai, Tamás Vizkelety, Zsolt Markella, Adrienne Rosta, Ágnes Kucserá, József Barabás
OBJECT: 3D cephalometry is often the only way to set up accurate diagnosis and treatment plan in the field of reconstructive surgery. In these cases complement exposures are needed beyond common cephalograms with higher accuracy than conventional Cone-Beam CT. Consequently the aim of our study was to perform a complex 3D cephalometry. As the first step of this approach, was the 3D adaptation of DiPaolo's Quadrilateral technique, and to determine norms of references in lower face by means of CBCT...
June 2016: Fogorvosi Szemle
https://www.readbyqxmd.com/read/27536484/low-cost-design-and-manufacturing-of-surgical-guides-for-mandibular-reconstruction-using-a-fibula
#20
Toshiaki Numajiri, Hiroko Nakamura, Yoshihiro Sowa, Kenichi Nishino
BACKGROUND: Surgical cutting guides are used in mandibular reconstruction involving osteotomy of the mandible and fibula. Cutting guides produced using computer-aided design (CAD) and computer-aided manufacturing (CAM) technologies have been reported recently. These guides aim to increase the benefits to patients by improving the accuracy, shortening the operating time, and correcting occlusion. However, the availability of these advanced technologies is limited in some regions of the world...
July 2016: Plastic and Reconstructive Surgery. Global Open
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