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https://www.readbyqxmd.com/read/29351691/out-of-field-doses-in-children-treated-for-large-arteriovenous-malformations-using-hypofractionated-gamma-knife-radiosurgery-and-intensity-modulated-radiation-therapy
#1
Marijke De Saint-Hubert, Marija Majer, Hrvoje Hršak, Zdravko Heinrich, Željka Kneževic, Saveta Miljanic, Paulina Porwol, Liliana Stolarczyk, Filip Vanhavere, Roger M Harrison
The purpose of this study was to measure out-of-field organ doses in two anthropomorphic child phantoms for the treatment of large brain arteriovenous malformations (AVMs) using hypofractionated gamma knife (GK) radiosurgery and to compare these with an alternative treatment using intensity-modulated radiation therapy (IMRT). Target volume was identical in size and shape in all cases. Radiophotoluminescent (RPL), thermoluminescent (TL) and optically stimulated luminescent (OSL) dosimeters were used for out-of-field dosimetry during GK treatment and a good agreement within 1-2% between results was shown...
January 17, 2018: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/29351052/particulate-coral-hydroxyapatite-sheltered-by-titanium-mesh-for-localized-alveolar-rehabilitation-after-onlay-graft-failure-a-case-report
#2
Miao Zhou, Shuyi Li, Hendrik Terheyden, Shuaishuai Cao, Yuejuan Che, Yuanming Geng
Reconstruction of bone loss in the alveolar ridge has long been challenging. Autologous bone grafts are considered as the "golden standard", while little research has focused on how to repair pronounced alveolar bone defects after autologous bone graft failure. The aim of this study was to detail a method based on the titanium mesh technique coupled with particulate coral hydroxyapatite to solve the Onlay graft failure. With bone deficiency in the #11 and #24- #25 regions, we harvested two autologous bone blocks for reconstruction...
January 19, 2018: Journal of Oral Implantology
https://www.readbyqxmd.com/read/29349353/estimation-of-optimal-nasotracheal-tube-depth-in-adult-patients
#3
Sung-Mi Ji
Background: The aim of this study was to estimate the optimal depth of nasotracheal tube placement. Methods: We enrolled 110 patients scheduled to undergo oral and maxillofacial surgery, requiring nasotracheal intubation. After intubation, the depth of tube insertion was measured. The neck circumference and distances from nares to tragus, tragus to angle of the mandible, and angle of the mandible to sternal notch were measured. To estimate optimal tube depth, correlation and regression analyses were performed using clinical and anthropometric parameters...
December 2017: Journal of Dental Anesthesia and Pain Medicine
https://www.readbyqxmd.com/read/29345723/anatomical-characteristics-of-the-lingual-foramen-in-ancient-skulls-a-cone-beam-computed-tomography-study-in-an-anatolian-population
#4
Kemal Özgür Demiralp, Seval Bayrak, Mukadder Orhan, Arzu Alan, Emine Şebnem Kurşun Çakmak, Kaan Orhan
BACKGROUND: The purpose of this study is to evaluate the anatomical features of lingual foramina and their bony canals in Anatolian ancient mandibles which belong to 9-10th century by using cone beam computed tomography (CBCT). MATERIALS AND METHODS: 58 ancient dry mandibles were scanned with CBCT. Lingual foramina were grouped into midline, paramedian, posterior foramina and combination of these groups. Midline group was also classified according to internal surface of the mandible (gonial tubercles)...
January 18, 2018: Folia Morphologica (Warsz)
https://www.readbyqxmd.com/read/29344820/metastases-from-distant-primary-tumours-on-the-head-and-neck-clinical-manifestation-and-diagnostics-of-91-cases
#5
Sven Holger Baum, Christopher Mohr
PURPOSE: The aim of this study was to evaluate which primary tumours metastasize on the head and neck region, identify the kind of clinical manifestation, the types of diagnostics that should be performed, and prove that the therapy appears possible and useful. PATIENTS: As many as 91 patients with a distant metastasis on the head and neck were enrolled in this retrospective clinical study from January 2004 to September 2016. All the patients were evaluated for clinical symptoms, primary tumour, localization, diagnostics, and surgical procedure...
January 17, 2018: Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29344160/the-role-of-computed-tomography-and-magnetic-resonance-imaging-in-diagnosing-clear-cell-ameloblastoma-a-case-report
#6
Shoko Gamoh, Masahiro Wato, Hironori Akiyama, Kaname Tsuji, Hiroki Ishikawa, Kaori Naruse, Hiroaki Yoshida, Shosuke Morita, Akio Tanaka, Kimishige Shimizutani
Ameloblastoma is the most common and clinically relevant type of odontogenic tumor. Clear cell odontogenic carcinoma is histologically characterized by solid sheets and nests of clear cells, whereas clear cell ameloblastoma (CCAM) is histologically characterized by an ameloblastomatous component intermixed with an extensive clear cell component. A total of 12 reports have been published on the histological etiology for CCAM; however, no reports have made regarding the detailed computed tomography and/or magnetic resonance imaging features of tumors of this type...
December 2017: Oncology Letters
https://www.readbyqxmd.com/read/29343898/assessment-of-temporomandibular-joint-dysfunction-in-condylar-fracture-of-the-mandible-using-the-helkimo-index
#7
S Suhas, Sharad Ramdas, P P Lingam, H R Naveen Kumar, Aashish Sasidharan, R Aadithya
Introduction: Condylar fractures of the mandible are functionally important fractures as the condyle of the mandible being a part of the temporomandibular joint (TMJ) and can lead to TMJ dysfunction if not properly treated. Materials and Methods: This was a cross-sectional study of a total of 33 treated patients with fracture of the mandibular condyle who underwent examination as per the Helkimo index. Their dysfunction was quantified and clinicoepidemiological characteristics were assessed...
May 2017: Indian Journal of Plastic Surgery: Official Publication of the Association of Plastic Surgeons of India
https://www.readbyqxmd.com/read/29341976/cone-beam-ct-assessment-of-the-position-of-the-medial-lingual-foramen-for-dental-implant-placement-in-the-anterior-symphysis
#8
Arturo Sanchez-Perez, Paula Boix-Garcia, Pía Lopez-Jornet
OBJECTIVES: To determine the position of the mandibular medial lingual foramen with cone-beam CT (CBCT) 3D imaging modalities when implants are to be placed in the anterior symphysis of the mandible. MATERIALS AND METHODS: A total of 111 CBCTs were considered acceptable and analyzed. The variables measured were as follows: (1) length of the outlet duct; (2) distance from the canal to the buccal cortex; (3) distance from the canal to the inferior cortex; (4) distance from the canal to the lingual cortex; (5) distance from the canal to the alveoli of the nearest tooth in dentate patients and distance from the canal to the marginal crest in edentulous patients; (6) angle of the duct to the horizontal Frankfurt plane; (7) diameter of the exit orifice; and (8) output level of the socket in relation to the teeth and the presence of bifurcations...
January 16, 2018: Implant Dentistry
https://www.readbyqxmd.com/read/29340482/clear-cell-odontogenic-carcinoma-of-the-mandible-a-treatment-strategy
#9
Sabrina Ferreira, Leonardo Perez Faverani, Gabriel Mulinari Dos Santos, Everton Pontes Martins, Idelmo Rangel Garcia Júnior
Clear cell odontogenic carcinoma (CCOC) is a rare odontogenic tumor of the jaws, histologically characterized by the presence of agglomerates of cells with eosinophilic cytoplasm. The patient, a 62-year-old Caucasian woman, presented an intraosseous lesion in the mandibular symphysis. A clinical examination revealed a discrete volumetric increase with a hard consistency, palpable to extraoral and intraoral examinations. Imaging studies revealed an extensive radiolucent area, without defined limits, extending from the region of the right second premolar to the left canine...
January 15, 2018: Journal of Applied Oral Science: Revista FOB
https://www.readbyqxmd.com/read/29340349/prevalence-of-dental-implants-and-evaluation-of-peri-implant-bone-levels-in-patients-presenting-to-a-dental-school-a-radiographic-cross-sectional-2-year-study
#10
Eylem Ayhan Alkan, Lian Ping Mau, John Schoolfield, Gary F Guest, David L Cochran
PURPOSE: To evaluate the number of patients with dental implants who present to a dental school clinic for screening and to report the prevalence of peri-implant bone level change detected on digital panoramic radiographs of those subjects. MATERIALS AND METHODS: Patient screening files for 9,422 patients over a 2-year period were examined to see how many patients presented with dental implants. Those patients with at least one implant were further evaluated by measuring the bone level on the mesial and distal sides of the implant using the screening radiograph...
January 2018: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/29340348/peri-implant-tissues-and-patient-satisfaction-after-treatment-of-vertically-augmented-atrophic-posterior-mandibles-with-intraoral-onlay-block-bone-grafts-a-retrospective-3-year-case-series-follow-up-study
#11
Amparo Aloy-Prósper, David Peñarrocha-Oltra, Maria Peñarrocha-Diago, Federico Hernández-Alfaro, Miguel Peñarrocha-Diago
PURPOSE: To evaluate the peri-implant soft and hard tissues of dental implants placed in vertically regenerated posterior mandibles with intraoral onlay block bone grafts and patient satisfaction at 3-year follow-up. MATERIALS AND METHODS: A retrospective study of patients with dental implants placed in posterior mandibular sites vertically augmented with intraoral onlay block bone grafts was carried out between 2005 and 2009 at the University of Valencia. The outcomes assessed at the 3-year follow-up visit were the peri-implant soft tissues (Plaque Index and Bleeding Index, probing depth, keratinized mucosa width, and recession), implant survival and success rates, marginal bone loss, and patient satisfaction...
January 2018: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/29340345/intraosseous-temperature-changes-during-implant-site-preparation-in-vitro-comparison-of-thermocouples-and-infrared-thermography
#12
Sönke Harder, Christopher Egert, Sandra Freitag-Wolf, Christian Mehl, Matthias Kern
PURPOSE: Implant-supported dental prostheses are based on the principle of osseointegration, and the success of dental implantation depends on adequate formation of this intimate bone-to-implant contact. The application of heat during the drilling procedure leads to a rise in intraosseous temperature at the prospective implant site, which may result in various complications. The purpose of the present study was to compare the ability of thermocouples and infrared thermography to detect changes in intraosseous temperature during dental implant site preparation...
January 2018: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/29337994/a-reassessment-of-the-montmaurin-la-niche-mandible-haute-garonne-france-in-the-context-of-european-pleistocene-human-evolution
#13
Amélie Vialet, Mario Modesto-Mata, María Martinón-Torres, Marina Martínez de Pinillos, José-María Bermúdez de Castro
We here present a comparative study of the Montmaurin-LN Middle Pleistocene mandible (Haute-Garonne, France). This mandible, of which its right and left molar series are preserved in situ, was found in La Niche cave (Montmaurin's karst system) in 1949, and was first attributed to the 'Mindel-Riss' interglacial (= MIS 9 to 11) based on its geological context. Later studies based on geological and faunal evidence have attributed the Montmaurin-LN mandible to MIS 7. Following a detailed morphological and metric comparative study of the mandible in the 1970s, it was interpreted in the light of a still limited fossil record and the prevailing paradigm back then...
2018: PloS One
https://www.readbyqxmd.com/read/29337634/risk-factors-associated-with-open-gingival-embrasures-after-orthodontic-treatment
#14
Sang Su An, Yoon Jeong Choi, Ji Young Kim, Chooryung J Chung, Kyung-Ho Kim
OBJECTIVES: To investigate the incidence of and contributing factors to open gingival embrasures between the central incisors after orthodontic treatment. MATERIALS AND METHODS: One hundred posttreatment patients (29 men and 71 women; mean age, 24.7 years) were divided retrospectively into occurrence and nonoccurrence groups based on intraoral photographs. Based on the severity, the occurrence group was further divided into mild, moderate, and severe groups. Parameters from periapical radiographs, superimposed lateral cephalograms, and study models were compared between the occurrence and the nonoccurrence groups by using independent t-tests and were also analyzed on the basis of severity via analysis of variance...
January 16, 2018: Angle Orthodontist
https://www.readbyqxmd.com/read/29335485/electron-beam-melting-in-the-fabrication-of-three-dimensional-mesh-titanium-mandibular-prosthesis-scaffold
#15
Rongzeng Yan, Danmei Luo, Haitao Huang, Runxin Li, Niu Yu, Changkui Liu, Min Hu, Qiguo Rong
The study was designed to fulfill effective work-flow to fabricate three-dimensional mesh titanium scaffold for mandibular reconstruction. The 3D titanium mesh scaffold was designed based on a volunteer with whole mandible defect. (1) acquisition of the CT data; (2) design with computer aided design (CAD) and finite element analysis (FEA). The pore size and intervals with the best mechanic strength was also calculated using FEA. (3) fabrication of the scaffold using electron beam melting (EBM); (4) implantation surgery...
January 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29334509/comparison-of-stress-and-strain-distribution-around-splinted-and-nonsplinted-6-mm-short-implants-in-posterior-mandible-a-finite-element-analysis-study
#16
Mansour Meimandi, Mohammad Reza Talebi Ardakani, Reza Amid, Amir Mahmoudi Motlagh, Shahrzad Beheshti
PURPOSE: This study was designed to compare the biomechanical performance of splinted and nonsplinted short implants, in the posterior mandible, using finite element analysis. MATERIALS AND METHODS: Three-dimensional models of short implants with 2 different diameters (4 × 6 mm or 5 × 6 mm) were scanned, and CATIA (R21) was used to simulate the model of an edentulous lower jaw. Experimental groups were designed as follows: (1) D4L6-splinted (three 4 × 6-mm splinted implants), (2) D4L6-nonsplinted, (3) D5L6-splinted, and (4) D5L6-nonsplinted...
January 12, 2018: Implant Dentistry
https://www.readbyqxmd.com/read/29333780/-progress-in-exogenous-factors-affecting-the-growth-and-remodeling-of-condylar-process
#17
Peng Qiuping, Wu Jun
Condyle is a critical growth region of the mandible where mandible by endochondral ossification occurs. Condylar cartilage belongs to the secondary cartilage, which is not only affected by genetic factors but also by stress, drug intake, and other local factors. To promote the growth of the mandible, various exogenous and local factors were used to alter the biological environment of the condylar cartilage to stimulate endochondral ossification. This article reviews studies on the influence of exogenous factors on condylar growth and reconstruction...
December 1, 2017: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/29333774/-a-cone-beam-computed-tomography-study-on-the-anatomical-position-of-accessory-mandibular-foramina-in-jiangxi-adults
#18
Ke Xing, Li Bohan, Chen Linlin, Jiang Xindi
OBJECTIVE: This study used cone beam computed tomography (CBCT) to access the distribution and position of accessory mandibular foramina in the mandibular body of Jiangxi adults, and some safety rules of operation for clinics were provided. METHODS: Two hundred CBCT image subjects of Jiangxi adults were selected, which were divided into 4 groups by age with the same sex ratio. The number and position of accessory mandibular foramina in mandibular anterior teeth, premolars and molars region were described and the relationship between accessory mandibular foramina incidence and factors of age, gender and lateral were analyzed...
December 1, 2017: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/29333372/ghost-cell-odontogenic-carcinoma-on-right-mandible-and-its-respective-surgical-reconstruction-a-case-report
#19
Sang Yoon Park, Joonhyoung Park, Do Hyun Kwon, Jae Ho Jeon, Soung Min Kim, Hoon Myoung, Jong Ho Lee
Calcifying cystic odontogenic tumor (CCOT) is defined as an odontogenic cyst-like benign neoplasm that characteristically contains several ghost cells, ameloblastoma-like epithelium, and occasional calcification. Ghost cell odontogenic carcinoma (GCOC), a malignant form of CCOT, is an exceptionally rare malignant tumor. In this report, we present a case of a 53-year-old man whose chief complaint was a solitary mass on the right mandible area. The mass was completely removed through an extraoral surgical approach and reconstructive surgery was performed in two phases...
December 2017: Journal of the Korean Association of Oral and Maxillofacial Surgeons
https://www.readbyqxmd.com/read/29330958/do-muscles-constrain-skull-shape-evolution-in-strepsirrhines
#20
Anne-Claire Fabre, Jonathan M G Perry, Adam Hartstone-Rose, AuróLien Lowie, Andy Boens, MaÏtena Dumont
Despite great interest and decades of research, the musculoskeletal relationships of the masticatory system in primates are still not fully understood. However, without a clear understanding of the interplay between muscles and bones it remains difficult to understand the functional significance of morphological traits of the skeleton. Here, we aim to study the impacts of the masticatory muscles on the shape of the cranium and the mandible as well as their co-variation in strepsirrhine primates. To do so, we use 3D geometric morphometric approaches to assess the shape of each bone of the skull of 20 species for which muscle data are available in the literature...
February 2018: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
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