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https://www.readbyqxmd.com/read/29908099/pathogenesis-of-primordial-odontogenic-tumour-based-on-tumourigenesis-and-odontogenesis
#1
Toshinari Mikami, Ronell Bologna-Molina, Adalberto Mosqueda-Taylor, Ikuko Ogawa, Vanesa Pereira-Prado, Naoki Fujiwara, Fabio Ramoa Pires, Roman Carlos, Takashi Takata, Yasunori Takeda
OBJECTIVE: Primordial odontogenic tumour (POT) is a rare benign mixed epithelial and mesenchymal odontogenic tumour. POT is composed of dental papilla-like tissue covered with cuboidal to columnar epithelium that resembles to inner and outer enamel epithelium of the enamel organ without dental hard tissue formation. The aim of this study was to examine pathogenesis of POT based on tumourigenesis and odontogenesis. SUBJECTS AND METHODS: Six cases of POT were submitted for study...
June 16, 2018: Oral Diseases
https://www.readbyqxmd.com/read/29904598/case-report-a-primordial-odontogenic-tumor
#2
Hatem Amer, Layla Hafed, Sally Ibrahim
Introduction: Primordial odontogenic tumors are a rare recently described mixed odontogenic tumor composed histopathologically of dental papilla like tissue and enamel organ like tissue. Only nine cases have been documented worldwide and we are reporting the tenth case which is from Egypt. Clinical finding: A 2-year-old Egyptian boy that presented with an asymptomatic swelling of the mandible which appeared with multilocular radiolucency associated with an impacted developing tooth on a computerized tomography (CT) scan...
2018: F1000Research
https://www.readbyqxmd.com/read/29903561/multidetector-row-computed-tomography-in-maxillofacial-imaging
#3
REVIEW
Anita Gohel, Masafumi Oda, Amol S Katkar, Osamu Sakai
Multidetector row CT (MDCT) offers superior soft tissue characterization and is useful for diagnosis of odontogenic and nonodontogenic cysts and tumors, fibro-osseous lesions, inflammatory, malignancy, metastatic lesions, developmental abnormalities, and maxillofacial trauma. The rapid advances in MDCT technology, including perfusion CT, dual-energy CT, and texture analysis, will be an integrated anatomic and functional high-resolution scan, which will help in diagnosis of maxillofacial lesions and overall patient care...
July 2018: Dental Clinics of North America
https://www.readbyqxmd.com/read/29892529/quantitative-analysis-of-argyrophilic-nucleolar-organizer-regions-in-odontogenic-cysts-and-tumor-a-comparative-study
#4
Bhavana Gupta, Shaleen Chandra, Vineet Raj, Vivek Gupta
Background: The nucleolar organizer region (NOR) is by definition part of a chromosome, and nucleolus is a structure containing this chromosomal part and in addition the material which accumulate around the NOR, mostly rRNAs and their precursors as well as specific ribosomal proteins. Argyrophilic Nucleolar organizing region (AgNOR) are silver binding NORs often used to study cell proliferation in various types of tumors. Aim: Quantitative assessment of Argyrophilic Nucleolar organizing region count and its comparison among dentigerous cyst, keratocystic odontogenic tumor and ameloblastoma...
May 2018: Journal of Oral Biology and Craniofacial Research
https://www.readbyqxmd.com/read/29892525/treatment-of-odontogenic-infections-an-analysis-of-two-antibiotic-regimens
#5
Manish Bhagania, Wael Youseff, Pushkar Mehra, Ruben Figueroa
Purpose: Retrospective analysis of the efficacy for two commonly used antibiotic regimens in the management of severe odontogenic infections. Patients and Methods: Evaluation of records of patients admitted to the Oral and Maxillofacial Surgery service at Boston University Medical Center from 2009 to 2014 with severe infections of odontogenic origin (SOI). Patients were divided into two groups based on the administered intravenous antibiotic: 1) Group I: Clindamycin only and 2) Group II: Penicillin and Metronidazole...
May 2018: Journal of Oral Biology and Craniofacial Research
https://www.readbyqxmd.com/read/29892328/a-case-of-an-extensive-keratocystic-odontogenic-tumor-in-the-mandible-reconstructed-with-a-custom-made-total-joint-prosthesis
#6
Payam Farzad
The use of virtual surgical planning and computer-aided design/computer-aided manufacturing has previously been reported to enhance the planning for the reconstruction of mandibular continuity defects and to reduce surgical time. Reported is a case of a large keratocystic odontogenic tumor (KOT) affecting right hemimandible including the condylar neck. This case was initially reconstructed with a condyle-bearing reconstruction plate, but because of fatigue fracture 15 years later, a new reconstruction with a custom-made total joint temporomandibular prosthesis was performed...
June 2018: Craniomaxillofacial Trauma & Reconstruction
https://www.readbyqxmd.com/read/29890883/calcifying-odontogenic-cyst-associated-with-dentigerous-cyst-in-a-15-year-old-girl
#7
Paola Aristizabal Arboleda, Celeste Sánchez-Romero, Oslei Paes de Almeida, Sergio A Flores Alvarado, Ricardo Martínez Pedraza
Calcifying odontogenic cyst (COC) is a rare odontogenic cyst with ameloblastic epithelial lining containing clusters of ghost cells. COCs have been described in association with several odontogenic tumors, more commonly odontomas and rarely with dentigerous cyst (DC). In this article, we describe a case of COC associated with DC in a 15-year-old girl, who presented with a swelling on the right middle third of the face, producing facial asymmetry. Panoramic radiography showed a well-circumscribed, corticated, and unilocular radiolucency at the level of the right maxillary sinus, involving 2 unerupted premolars...
June 1, 2018: International Journal of Surgical Pathology
https://www.readbyqxmd.com/read/29887803/dual-ecm-biomimetic-scaffolds-for-dental-pulp-regenerative-applications
#8
Chun-Chieh Huang, Raghuvaran Narayanan, Noah Warshawsky, Sriram Ravindran
Dental pulp is a highly vascularized and innervated tissue that provides sensitivity and vitality to the tooth. Chronic caries results in an infected pulp tissue prone to necrosis. Existing clinical treatments replace the living pulp tissue with a non-responsive resin filling resulting in loss of tooth vitality. Tissue engineering approaches to dental pulp tissue regeneration have been investigated to preserve tooth vitality and function. However, a critical criterion is the choice of growth factors that may promote mesenchymal stem cell differentiation and more importantly, vascularization...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29884339/poly-adenosine-phosphate-ribose-polymerase-1-inhibition-enhances-brain-derived-neurotrophic-factor-secretion-in-dental-pulp-stem-cell-derived-odontoblastlike-cells
#9
Yessenia Valverde, Raghuvaran Narayanan, Satish B Alapati, Fanny Chmilewsky, Chun-Chieh Huang, Sriram Ravindran, Seung H Chung
INTRODUCTION: The nuclear enzyme poly(adenosine phosphate ribose) polymerase 1 (PARP-1) has been implicated in the maintenance and differentiation of several stem cells. The role of PARP-1 in dental pulp stem cell (DPSC) differentiation, especially in the context of its ability to modulate nerve regeneration factors, has not been investigated. Regeneration of neuronal components in pulp tissue is important for the assessment of tooth vitality. Brain-derived neurotrophic factor (BDNF) is known to play an integral signaling factor during nerve regeneration...
June 5, 2018: Journal of Endodontics
https://www.readbyqxmd.com/read/29879802/management-of-primary-odontogenic-myxoma
#10
Silvia Tortorici, Angelo Itro, Paolo Difalco
BACKGROUND: This retrospective study describes our experience in the management of odontogenic myxoma. METHODS: Thirty-four patients (23 female and 11 male) with single lesions were treated. Thirty-three patients were adults (mean age 33.5 years) and one child (age 6 years). Male:female ratio was 1:2. Different surgical procedures were used to treat the tumors. 11 lesions were treated by marginal osteotomy, 12 lesions by enucleation and curettage, 11 lesions by radical treatment (segmental or block resection)...
June 2018: Minerva Stomatologica
https://www.readbyqxmd.com/read/29877260/recovery-of-pure-red-cell-aplasia-following-hematopoietic-stem-cell-transplantation-associated-with-il-6-elevation-caused-by-odontogenic-infection
#11
Nobuhiko Nakamura, Soranobu Ninomiya, Takuro Matsumoto, Hiroshi Nakamura, Junichi Kitagawa, Takeshi Hara, Masahito Shimizu, Hisashi Tsurumi
We herein report a case of long-lasting pure red cell aplasia (PRCA) after major ABO-incompatible allogeneic stem cell transplantation (SCT) for acute lymphoblastic leukemia. The patient needed red blood cell (RBC) transfusion every week after SCT. On day 236, he was diagnosed with odontogenic infection, and the serum levels of IL-6 were elevated to 12.1 pg/ml. After that, the numbers of reticulocyte rapidly began to increase, and RBC support was not needed from day 251. No standard care for PRCA following SCT has been established...
June 6, 2018: Internal Medicine
https://www.readbyqxmd.com/read/29876335/complication-of-an-odontogenic-infection-to-an-orbital-abscess-the-role-of-a-medical-fraudster-quack
#12
Nikhil Arora, Ruchika Juneja, Ravi Meher
Introduction: Complication of an odontogenic infection to an orbital abscess is not a common presentation. The progression from a simple toothache to a condition that may lead to loss of vision is sudden and severe. Case Report: We report a rare case in which a patient developed facial cellulitis that progressed to orbital abscess after unsterile dental manipulation by a medical fraudster ("quack"). The patient was initiated on high-grade antibiotics, which resolved the facial cellulitis...
May 2018: Iranian Journal of Otorhinolaryngology
https://www.readbyqxmd.com/read/29866242/secondary-ameloblastic-carcinoma-of-mandible-with-pulmonary-metastasis
#13
Syeda Sara Tajammul, Usman Ali, Faiza Kazi, Hassan Mahmood
Ameloblastic carcinoma (AC) is a very rare odontogenic malignancy. Primary AC is more common in maxilla, while secondary AC is more common in mandible. Histologically, it is an ameloblastoma with features of cancer. Presence of metastasis is not necessary to establish the diagnosis. This tumor usually metastasises in bone or lungs. We report a case of aggressive secondary AC of mandible with lung metastasis. There are few cases in medical literature discussing management of AC with lung metastasis. In this case, a 42-year woman, who was diagnosed with ameloblastoma of right mandible, was treated with right hemi-mandibulectomy...
June 2018: Journal of the College of Physicians and Surgeons—Pakistan: JCPSP
https://www.readbyqxmd.com/read/29863959/msx2-prevents-stratified-squamous-epithelium-formation-in-the-enamel-organ
#14
M Nakatomi, H Ida-Yonemochi, C Nakatomi, K Saito, S Kenmotsu, R L Maas, H Ohshima
Tooth enamel is manufactured by the inner enamel epithelium of the multilayered enamel organ. Msx2 loss-of-function mutation in a mouse model causes an abnormal accumulation of epithelial cells in the enamel organ, but the underlying mechanism by which Msx2 regulates amelogenesis is poorly understood. We therefore performed detailed histological and molecular analyses of Msx2 null mice. Msx2 null ameloblasts and stratum intermedium (SI) cells differentiated normally in the early stages of amelogenesis. However, during subsequent developmental stages, the outer enamel epithelium (OEE) became highly proliferative and transformed into a keratinized stratified squamous epithelium that ectopically expressed stratified squamous epithelium markers, including Heat shock protein 25, Loricrin, and Keratin 10...
June 1, 2018: Journal of Dental Research
https://www.readbyqxmd.com/read/29862107/calcifying-odontogenic-cyst-with-extensive-areas-of-dentinoid-uncommon-case-report-and-update-of-main-findings
#15
Hellen Bandeira de Pontes Santos, Everton Freitas de Morais, Deborah Gondim Lambert Moreira, Luis Ferreira de Almeida Neto, Petrus Pereira Gomes, Roseana de Almeida Freitas
The calcifying odontogenic cyst (COC) is a benign odontogenic cyst that occurs in the gnathic bones. This cyst is part of a spectrum of lesions characterized by odontogenic epithelium containing "ghost cells," which may undergo calcification. Areas of an eosinophilic matrix material compatible dentinoid also may present adjacent to the epithelial component. However, these areas of dentinoid commonly do not appear so abundant in COCs. In this study, we report a case of intraosseous COC with extensive areas of dentinoid and perform an update regarding the clinical, radiographical, histopathological, and differential diagnosis, treatment, and prognosis of this cystic lesion...
2018: Case Reports in Pathology
https://www.readbyqxmd.com/read/29850338/initial-stage-primary-intraosseous-squamous-cell-carcinoma-derived-from-odontogenic-keratocyst-with-unusual-keratoameloblastomatous-change-of-the-maxilla-a-case-report-and-literature-discussion
#16
Kentaro Kikuchi, Fumio Ide, Shota Takizawa, Seiji Suzuki, Hideaki Sakashita, Tie-Jun Li, Kaoru Kusama
Primary intraosseous squamous cell carcinoma (PIOSCC) is a rare malignant neoplasm derived from odontogenic epithelial remnants in the central jaw bone. Most PIOSCCs originate from odontogenic cysts with a nonkeratinized epithelial lining, especially from radicular/residual and dentigerous cysts. There have been few reports of PIOSCCs derived from the odontogenic keratocyst (OKC), particularly those describing pathological features at the initial stage. The diagnosis of PIOSCC is difficult and based on exclusion of other carcinomas, including metastatic tumors from other primary sites...
2018: Case Reports in Otolaryngology
https://www.readbyqxmd.com/read/29850282/bilateral-maxillary-dentigerous-cysts-in-a-nonsyndromic-child-a-rare-presentation-and-review-of-the-literature
#17
Rakshit Vijay Khandeparker, Purva Vijay Khandeparker, Anirudha Virginkar, Kiran Savant
Dentigerous cysts represent the second most common odontogenic cysts of the jaws after radicular cysts and are usually associated with the crowns of unerupted permanent teeth and rarely deciduous teeth. They are usually solitary in their presentation. Multiple and bilateral dentigerous cysts are an extremely rare presentation in the absence of developmental syndromes or systemic diseases or the use of prescribed certain medications. We hereby present a case of a bilateral dentigerous cyst of the maxilla in a 10-year-old child involving the crowns of unerupted permanent second premolar on the right side and the unerupted permanent canine on the left side...
2018: Case Reports in Dentistry
https://www.readbyqxmd.com/read/29848536/taking-heed-of-the-danger-space-acute-descending-necrotising-mediastinitis-secondary-to-primary-odontogenic-infection
#18
Rose Mark, Swithin Song, Peter Mark
Descending necrotising mediastinitis (DNM) is an uncommon clinical entity which may arise secondary to primary odontogenic or neck infection in susceptible patients. Infection may spread contiguously via the alar or 'danger' space, a potential anatomical space posterior to the true retropharyngeal space.1 Spread of infection to the mediastinum almost always necessitates urgent cardiothoracic surgical intervention.2-4 This case report describes a male patient whose clinical deterioration following the diagnosis of submandibular abscess was investigated with CT imaging of the chest, where a diagnosis of DNM was made...
May 30, 2018: BMJ Case Reports
https://www.readbyqxmd.com/read/29846904/sinonasal-ameloblastoma
#19
Benjamin G Barrena, Billy J Phillips, Kenneth J Moran, Sasha J Betz
Ameloblastomas are benign but aggressive odontogenic tumors that most commonly affect the posterior mandible. Approximately 15% occur in the maxilla, with a subset thought to originate from the epithelial lining of the sinonasal cavities. Histologically, sinonasal ameloblastomas are identical to those of the oral cavity, with classical features of palisaded columnar basilar cells surrounding a central proliferation that resembles the stellate reticulum of a developing tooth. Unlike the gnathic variant, sinonasal ameloblastomas tend to affect males more than females, and the incidence of diagnosis peaks at a later age, approximately 60 years old...
May 30, 2018: Head and Neck Pathology
https://www.readbyqxmd.com/read/29845895/comparative-study-of-the-minichromosome-maintenance-proteins-complex-mcm-4-5-6-in-ameloblastoma-and-unicystic-ameloblastoma
#20
Delmira Apellániz, Vanesa Pereira-Prado, Estefania Sicco, Gabriela Vigil-Bastitta, Rogelio González-González, Adalberto Mosqueda-Taylor, Nelly Molina-Frechero, Marcela Hernandez, Celeste Sánchez-Romero, Ronell Bologna-Molina
INTRODUCTION: Solid/conventional ameloblastoma (AM) and unicystic ameloblastoma (UAM) are the most frequent benign epithelial odontogenic tumors located in the maxillary region, and their treatment usually consists of extensive surgical resection. Therefore, it is relevant to study molecular markers to better understand the biological behavior of these tumors. The aim of this study was to describe and compare the expression of proteins related to cellular proliferation: Ki-67 and MCM4-6 complex...
May 1, 2018: International Journal of Surgical Pathology
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