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https://www.readbyqxmd.com/read/28812679/meckel-s-cartilage-breakdown-offers-clues-to-mammalian-middle-ear-evolution
#1
Neal Anthwal, Daniel J Urban, Zhe-Xi Luo, Karen E Sears, Abigail S Tucker
A key transformation in mammalian ear evolution was incorporation of the primary jaw joint of premammalian synapsids into the definitive mammalian middle ear of living mammals. This evolutionary transition occurred in two steps, starting with a partial or 'transitional' mammalian middle ear in which the ectotympanic and malleus were still connected to the mandible by an ossified Meckel's cartilage (MC), as observed in many Mesozoic mammals. This was followed by MC breakdown, freeing the ectotympanic and the malleus from the mandible and creating the definitive mammalian middle ear...
March 6, 2017: Nature ecology & evolution
https://www.readbyqxmd.com/read/28812639/late-pliocene-environmental-change-during-the-transition-from-australopithecus-to-homo
#2
Joshua R Robinson, John Rowan, Christopher J Campisano, Jonathan G Wynn, Kaye E Reed
It has long been hypothesized that the transition from Australopithecus to Homo in eastern Africa was linked to the spread of open and arid environments near the Plio-Pleistocene boundary, but data for the latest Pliocene are scarce. Here we present new stable carbon isotope data from the late Pliocene mammalian fauna from Ledi-Geraru, in the lower Awash Valley (LAV), Ethiopia, and mammalian community analyses from the LAV and Turkana Basin. These data, combined with pedogenic carbonate stable isotopes, indicate that the two regions were largely similar through the Plio-Pleistocene, but that important environmental differences existed during the emergence of Homo around 2...
May 15, 2017: Nature ecology & evolution
https://www.readbyqxmd.com/read/28811166/biomechanical-implications-of-cortical-elastic-properties-of-the-macaque-mandible
#3
Paul C Dechow, Olga Panagiotopoulou, Poorva Gharpure
Knowledge of the variation in the elastic properties of mandibular cortical bone is essential for modeling bone function. Our aim was to characterize the elastic properties of rhesus macaque mandibular cortical bone and compare these to the elastic properties from mandibles of dentate humans and baboons. Thirty cylindrical samples were harvested from each of six adult female rhesus monkey mandibles. Assuming orthotropy, axes of maximum stiffness in the plane of the cortical plate were derived from ultrasound velocity measurements...
June 17, 2017: Zoology: Analysis of Complex Systems, ZACS
https://www.readbyqxmd.com/read/28810133/floor-of-mouth-hematoma-following-dental-implant-placement-systematic-review-and-case-presentation
#4
REVIEW
Catherine Law, Peyman Alam, Farzad Borumandi
PURPOSE: The authors provide a structured review of reported cases of floor-of-mouth hematoma during or after dental implantation and frequent causes and management and present a related case. MATERIALS AND METHODS: An online search of the medical literature was conducted from 1990 through 2016. The following search terms were used: floor of mouth hematoma, sublingual hematoma, dental implant hematoma, implant in mandible, and complication of dental implant. Abstracts were screened for relevance to the aims of the review...
July 21, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28809378/reduction-rate-by-decompression-as-a-treatment-of-odontogenic-cysts
#5
L Oliveros-Lopez, A Fernandez-Olavarria, D Torres-Lagares, M-A Serrera-Figallo, R Castillo-Oyagüe, J-J Segura-Egea, J-L Gutierrez-Perez
BACKGROUND: Odontogenic cysts are defined as those cysts that arise from odontogenic epithelium and occur in the tooth-bearing regions of the jaws. Cystectomy, marsupialization or decompression of odontogenic cyst are treatment approach to this pathology. The aim of this study was to evaluate the effectiveness of the decompression as the primary treatment of the cystic lesions of the jaws and them reduction rates involving different factors. MATERIAL AND METHODS: 23 patients with odontogenic cysts of the jaws, previously diagnosed by anatomical histopathology (follicular cysts (7) and radicular cysts (16)) underwent decompression as an initial treatment...
August 15, 2017: Medicina Oral, Patología Oral y Cirugía Bucal
https://www.readbyqxmd.com/read/28809376/inferior-alveolar-nerve-trajectory-mental-foramen-location-and-incidence-of-mental-nerve-anterior-loop
#6
M Velasco-Torres, M Padial-Molina, G Avila-Ortiz, R García-Delgado, A Catena, P Galindo-Moreno
OBJECTIVES: Injury of the inferior alveolar nerve (IAN) is a serious intraoperative complication that may occur during routine surgical procedures, such as dental implant placement or extraction of impacted teeth. Thus, the purpose of this study was to analyze the trajectory of the mandibular canal (MC), the location of the mental foramen (MF) and the presence and extension of an anterior loop of the mental nerve (AL). STUDY DESIGN: In this cross-sectional study, a total of 348 CBCTs were analyzed...
August 15, 2017: Medicina Oral, Patología Oral y Cirugía Bucal
https://www.readbyqxmd.com/read/28809375/clinical-parameters-of-implants-placed-in-healed-sites-using-flapped-and-flapless-techniques-a-systematic-review
#7
O Llamas-Monteagudo, P Girbés-Ballester, J Viña-Almunia, D Peñarrocha-Oltra, M Peñarrocha-Diago
BACKGROUND: Dental implant placement using flapless surgery is a minimally invasive technique that improves blood supply compared with flapped surgery. However, the flapless technique does not provide access to allow bone regeneration. OBJECTIVE: The aim of this systematic review was to evaluate the clinical parameters following implant surgery in healed sites, using two procedures: flapped vs. flapless surgery. MATERIALS AND METHODS: A detailed electronic search was carried out in the PubMed/Medline, Embase and Cochrane Library databases...
August 15, 2017: Medicina Oral, Patología Oral y Cirugía Bucal
https://www.readbyqxmd.com/read/28809369/maxillofacial-fracture-epidemiology-and-treatment-plans-in-the-northeast-of-iran-a-retrospective-study
#8
S Samieirad, M-R Aboutorabzade, E Tohidi, B Shaban, H Khalife, M-A Hashemipour, H-R Salami
BACKGROUND: The epidemiology of facial injuries varies based on lifestyle, cultural background and socioeconomic status in different countries and geographic zones. This study evaluated the epidemiology of maxillofacial fractures and treatment plans in hospitalized patients in Northeast of Iran (2015-2016). MATERIAL AND METHODS: In this retrospective study, the medical records of 502 hospitalized patients were evaluated in the Department of Maxillofacial Surgery in Kamyab Hospital in Mashhad, Iran...
August 15, 2017: Medicina Oral, Patología Oral y Cirugía Bucal
https://www.readbyqxmd.com/read/28808701/osteosarcoma-of-the-mandible-a-case-report-with-ct-mri-and-scintigraphy
#9
Mikiko Sue, Takaaki Oda, Yoshihiko Sasaki, Ayako Kameta, Yasuo Okada, Ichiro Ogura
Osteosarcomas are especially rare in the mandible and maxilla, representing 1.6% of all bony malignant tumours. In this article, we described a case of osteosarcoma of the mandible. Computed tomography (CT) image showed a well-circumscribed homogeneous mass, with nonhomogeneous contrast enhancement. T1-weighted magnetic resonance imaging (MR) image showed intermediate signal intensity on, and after administration the lesion showed signal intensity lower than muscle. T2-weighted MR image showed heterogeneous high signal intensity...
2017: Chinese Journal of Dental Research
https://www.readbyqxmd.com/read/28808451/prevalence-of-taurodont-molars-in-a-selected-iranian-adult-population
#10
Davoud Jamshidi, Maryam Tofangchiha, Nasim Jafari Pozve, Mahdis Mohammadpour, Bijan Nouri, Kazem Hosseinzadeh
INTRODUCTION: Taurodontism is an anomaly characterized by elongated crowns and consumedly apical location of the bifurcation area. This study aimed to determine the prevalence of taurodontism in molars based on digital panoramic radiographies in eight cities of Iran. METHODS AND MATERIALS: This descriptive cross-sectional study was conducted on 2360 digital panoramic radiographs taken for different treatment purposes. Demographic information of patients was recorded and radiographs were evaluated for presence of taurodont molars...
2017: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/28808219/spindle-cell-carcinoma-of-the-mandible-a-case-report
#11
Long Xie, Heming Wu, Siyu Liu, Hongwei Li
Spindle cell carcinoma is a rare highly malignant squamous cell carcinoma. Here, we describe a case of a 74-year-old Chinese female who presented with a 2-week history of pain and swelling in the left retromolar region. Surgical resection and titanium plate prosthesis were performed and histological analysis revealed spindle squamous cell carcinoma.
January 19, 2017: Journal of Biomedical Research
https://www.readbyqxmd.com/read/28807504/bone-up-craniomandibular-development-and-hard-tissue-biomineralization-in-neonate-mice
#12
Khari D Thompson, Holly E Weiss-Bilka, Elizabeth B McGough, Matthew J Ravosa
The presence of regional variation in the osteogenic abilities of cranial bones underscores the fact that the mechanobiology of the mammalian skull is more complex than previously recognized. However, the relationship between patterns of cranial bone formation and biomineralization remains incompletely understood. In four strains of mice, micro-computed tomography was used to measure tissue mineral density during perinatal development in three skull regions (calvarium, basicranium, mandible) noted for variation in loading environment, embryological origin, and ossification mode...
January 29, 2017: Zoology: Analysis of Complex Systems, ZACS
https://www.readbyqxmd.com/read/28806591/immediate-mechanical-stability-of-threaded-and-porous-implant-systems
#13
Do-Gyoon Kim, Yong-Hoon Jeong, Hua-Hong Chien, Amanda M Agnew, Jin Whan Lee, Hai Bo Wen
BACKGROUND: Primary stability of a dental implant system is an essential factor to maintain its long-term success. Thus, the objective of this study was to examine whether primary stability is different between threaded and porous dental implant systems placed in artificial bone blocks and human cadaveric mandibular bone. MATERIALS AND METHODS: Forty-two threaded and 42 highly porous dental implants were placed in artificial polyurethane bone foams with 7 different thicknesses (3...
August 5, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28806539/clinical-and-microstructural-findings-in-paget-disease-of-the-entire-mandible
#14
Reinhard E Friedrich, Andreas M Luebke, Michael Amling, Till Koehne
Paget disease of bone (PDB) is a chronic progressive bone disorder characterized by localized increased bone turnover and focal areas of woven bone formation. Although skull involvement is common, PDB very rarely affects the mandible. This report describes the clinical and histologic findings in a 75-year-old patient with PDB involving the mandible. Microstructural analyses showed an altered quality of the bone microstructure and calcium depletion of the affected bone. Differential diagnosis of PDB affecting the mandible is discussed...
July 20, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28806378/gummy-smile-correction-using-lingual-orthodontics-and-augmented-corticotomy-in-extremely-thin-alveolar-housing
#15
Kyung-Yen Nahm, Seung-Yun Shin, Hyo-Won Ahn, Seong-Hun Kim, Gerald Nelson
BACKGROUND: Tooth movement out of anatomic limitations was assisted by augmented corticotomy using deproteinized bovine bone mineral. METHODS: Lip protrusion can be reduced by premolar extraction followed by retraction of the anterior teeth. Surgical intervention is appropriate when the alveolar bone housing of the anterior region is insufficient for the tooth movement. In this patient, corticotomy in upper palatal area and anterior segmented osteotomy in the mandible were performed...
August 10, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28806245/gorham-stout-disease-affecting-the-mandible-bone-scintigraphy-and-computed-tomography-findings
#16
Soo Bin Park, Joon Young Choi, Soo Jeong Kim
We present images of a 13-year-old boy with Gorham-Stout disease affecting the mandible. Initial bone scintigraphy showed poor visualization of Tc-methylene diphosphonate (Tc-MDP) uptake in the mandible body. However, abnormally increased Tc-MDP uptake was noted in the bilateral mandibular rami. In the follow-up examination a year later, bone scintigraphy indicated that the disease had progressed to the bilateral mandibular rami with no uptake. In addition, massive osteolysis of the mandible was noted that had progressed since the initial computed tomography...
August 12, 2017: Clinical Nuclear Medicine
https://www.readbyqxmd.com/read/28805072/chronic-nonbacterial-osteomyelitis-of-the-mandible-recognition-etiology-and-management
#17
Harvey J Hamrick
No abstract text is available yet for this article.
July 1, 2017: Clinical Pediatrics
https://www.readbyqxmd.com/read/28803895/periderm-life-cycle-and-function-during-orofacial-and-epidermal-development
#18
REVIEW
Nigel L Hammond, Jill Dixon, Michael J Dixon
Development of the secondary palate involves a complex series of embryonic events which, if disrupted, result in the common congenital anomaly cleft palate. The secondary palate forms from paired palatal shelves which grow initially vertically before elevating to a horizontal position above the tongue and fusing together in the midline via the medial edge epithelia. As the epithelia of the vertical palatal shelves are in contact with the mandibular and lingual epithelia, pathological fusions between the palate and the mandible and/or the tongue must be prevented...
August 10, 2017: Seminars in Cell & Developmental Biology
https://www.readbyqxmd.com/read/28803805/three-dimensional-evaluation-of-molar-buccolingual-inclinations-after-orthodontic-treatment-using-edgewise-mechanics
#19
Branson Billings, Lana Helms, Katherine Kula, Achint Utreja, George Eckert, Ahmed Ghoneima
OBJECTIVES: The purpose of this study was to measure changes in buccolingual inclination and in thickness of maxillary and mandibular buccal and lingual bone of maxillary and mandibular molars following orthodontic treatment using edgewise mechanics. MATERIALS AND METHODS: Cone-beam computed tomography scans of 48 patients taken before and after completion of comprehensive orthodontic treatment were collected for this retrospective study. Buccolingual molar inclinations were reported as angular measurements using the long axis of the teeth and inferior border of the nasal floor and inferior border of the mandible, respectively...
August 10, 2017: International Orthodontics
https://www.readbyqxmd.com/read/28803745/further-development-of-the-mronj-minipig-large-animal-model
#20
Sven Otto, Christoph Pautke, Olga Martin Jurado, Dirk Nehrbass, Martin J Stoddart, Michael Ehrenfeld, Stephan Zeiter
Medication-related osteonecrosis of the jaw (MRONJ) is a rare but serious and potentially severe side effect of antiresorptive therapy with bisphosphonates or denosumab. Recently, a large animal minipig MRONJ model was introduced which led to early necrotic lesions in the majority of extraction sites after bisphosphonate administration. The aim of this project was to modify the preoperative cumulative bisphosphonate dose (zoledronate) and hereby firstly to demonstrate the reliability and reproducibility of the established model...
July 18, 2017: Journal of Cranio-maxillo-facial Surgery
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