Read by QxMD icon Read


Vikram Shetty, Sriram S Ganapathy
Retinoblastoma (RB) is an aggressive intraocular tumor arising from cells of the retina. Infrequently, distant metastasis occurs in advanced stages of the disease. This case report describes the metastasis of the tumor to the mandible, an extremely rare phenomenon. This condition was observed for a recurrent tumor in a patient who initially underwent chemotherapy, making this case report unique and providing new insights into the behavior of this tumor. An overview of the management of a metastatic RB also is discussed...
September 28, 2016: Journal of Oral and Maxillofacial Surgery
Yumiko Ohbayashi, Fumi Nakai, Akinori Iwasaki, Takaaki Ogawa, Yuka Yamamoto, Yoshihiro Nishiyama, Minoru Miyake
The duration of antiresorptive therapy is an important risk factor for medication-related osteonecrosis of the jaw. We performed a pilot study using quantitative analysis by bone scintigraphy to test the hypothesis that mandibular metabolism is affected by long-term bisphosphonate (BP) therapy. Our primary objectives were to assess changes in bone metabolism of the mandible in response to long-term BP therapy and compare the bone metabolism changes of the mandible with other bone sites. We compared the metabolic difference at the site in the mandible unaffected by disease, the humerus and the femur between 14 osteoporosis patients who were being treated with BP (BP group) and 14 patients who were not being treated with BP (control group) using a quantitative analysis and bone scintigraphy...
October 21, 2016: Odontology
Isil Aras, Aylin Pasaoglu, Sultan Olmez, Idil Unal, Aynur Aras
OBJECTIVES: Purpose of the present study was to determine and compare possible changes in the dimensions of the pharyngeal airway, morphology of the soft palate, and position of the tongue and hyoid bone after single-step or stepwise mandibular advancement using the Functional Mandibular Advancer (FMA). PATIENTS AND METHODS: The sample included 51 peak-pubertal Class II subjects. In all, 34 patients were allocated to two groups using matched randomization: a single-step mandibular advancement group (SSG) and a stepwise mandibular advancement group (SWG)...
October 21, 2016: Journal of Orofacial Orthopedics, Fortschritte der Kieferorthopädie
Charlotte Jensen, Gerry M Raghoebar, Wouter Kerdijk, Henny J A Meijer, Marco S Cune
OBJECTIVES: To assess the benefits of implant support to Removable Partial Dentures (RPD) in patients with a bilateral free-ending situation in the mandible and to determine the most favorable implant position: the premolar (PM) or the molar (M) region. METHODS: Thirty subjects with a bilateral unbounded posterior saddle received 2 PM and 2M Implants. A new RPD was placed. Implant support was provided 3 months later. Two PM implants supported the RPD. After 3 months the 2M implants were used or vice versa...
October 18, 2016: Journal of Dentistry
Kayoung Kim, Sung-Hwan Choi, Eun-Hee Choi, Yoon-Jeong Choi, Chung-Ju Hwang, Jung-Yul Cha
OBJECTIVE: To compare soft and hard tissue responses based on the degree of maxillary incisor retraction using maximum anchorage in patients with Class II Division 1 malocclusion. MATERIALS AND METHODS: This retrospective study sample was divided into moderate retraction (<8.0 mm; n = 28) and maximum retraction (≥8.0 mm; n = 29) groups based on the amount of maxillary incisor retraction after extraction of the maxillary and mandibular first premolars for camouflage treatment...
September 19, 2016: Angle Orthodontist
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
Panos Papaspyridakos, Yong-Jeong Kim, Matthew Finkelman, Khaled El-Rafie, Hans-Peter Weber
PURPOSE: The primary aim of this study was to assess the accuracy of different splinting materials to make implant cast verification jigs. The secondary aim was to assess the effect of 20° implant angulation on the accuracy of casts. MATERIALS AND METHODS: An edentulous mandibular arch with five internal connection tissue level implants served as control. The three implants in the anterior region were parallel to each other and the two implants in the posterior region were distally tilted 20° bilaterally...
October 21, 2016: Journal of Esthetic and Restorative Dentistry
Hideto Ohtsuki, Masayoshi Kawakami, Tetsuji Kawakami, Kazuya Takahashi, Tadaaki Kirita, Yutaka Komasa
OBJECTIVE: Osteoporosis has become a critical public health problem with the rapidly aging population in Japan. It is necessary for dentists to know their patients' status because it influences dental treatment. The purpose of this study was to predict the risk of osteoporosis in elderly patients visiting a dental clinic by assessing mandibular cortical morphology on panoramic radiographs. METHOD: Three-hundred and thirty patients were divided into three classes based on the morphology of their mandibular cortex on panoramic radiographs...
October 21, 2016: International Dental Journal
Liting Jiang, Xing Shen, Li Wei, Qi Zhou, Yiming Gao
OBJECTIVE: To evaluate microarchitectural changes in condylar cartilage and associated subchondral bone after bisphosphonates treatment using an ovariectomized (OVX) osteoporosis rat model. METHODS: Thirty six-month-old female Sprague-Dawley rats were randomly divided into sham, OVX, and risedronate (RIS)-treated groups. Both OVX and RIS groups received bilateral ovariectomy. OVX group was treated subcutaneously with saline, whereas RIS group received risedronate treatment (2...
October 21, 2016: Journal of Oral Pathology & Medicine
Zi-Hui Yang, Bao-Lei Wu, Chen Ye, Sen Jia, Xin-Jie Yang, Rui Hou, De-Lin Lei, Lei Wang
Distraction osteogenesis (DO) is a widely used self-tissue engineering. However, complications and discomfort due to the long treatment period are still the bottleneck of DO. Novel strategies to accelerate bone formation in DO are still needed. P38 is capable of regulating the osteogenic differentiation of both mesenchymal stem cells (MSCs) and osteoblasts, which are crucial to bone regeneration. However, it is not clear whether targeting p38 could regulate bony formation in DO. The purpose of the current work was to investigate the effects of local application of either p38 agonist anisomycin or p38 inhibitor SB203580 in a rat model of DO...
2016: International Journal of Medical Sciences
Eva Meia Rüegg, Paul Gniadek, Ali Modarressi, Denise Baratti-Mayer, Brigitte Pittet-Cuénod
INTRODUCTION: Reconstruction of facial bone defects in children is challenging. The use of well-vascularized bone is mandatory to obtain stable lasting results. This study reports our experience of facial bone reconstruction using prefabricated vascularized calvarium flaps. METHODS: Retrospective case series of 50 patients who underwent 52 maxillary, malar, and mandibular reconstructions between 1988 and 2014 using prefabricated vascularized calvarium flaps. Forty-nine patients suffered from noma sequels; one patient had craniofacial cleft Tessier 3-11...
September 10, 2016: Journal of Cranio-maxillo-facial Surgery
Sayaka Yoshiba, Takashi Saotome, Tetsuya Mikogami, Tatsuo Shirota
Phyllodes tumor is a rare breast tumor described by Müller (1938) as a lesion comprising leaflike stromal fibrous components and narrow cysts. The frequency of distant metastasis from this entity is reportedly approximately 20%, and no effective therapy has been established, so the prognosis is poor. This report describes the case of a 60-year-old woman with a history of left lung resection who showed metastasis of a mammary gland malignant phyllodes tumor to the oral cavity. Intraoral examination showed an elastic, hard mass measuring 28 × 27 mm in the gingiva around the left mandibular second molar...
September 23, 2016: Journal of Oral and Maxillofacial Surgery
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
Masahiro Iikubo, Takashi Nishioka, Shintaro Okura, Kaoru Kobayashi, Tsukasa Sano, Akitoshi Katsumata, Eiichiro Ariji, Ikuho Kojima, Maya Sakamoto, Takashi Sasano
OBJECTIVE: To determine the optimal scan settings (scan mode and position of field of view [FOV]) for cone beam computed tomography to reduce root fracture-like artifacts that are often observed in teeth filled with gutta-percha cones (GPCs). STUDY DESIGN: Fracture-like artifacts that appeared on cone beam computed tomography images of 9 extracted human mandibular premolars filled with GPCs were analyzed using I-mode (FOV, 102 mm; voxel size, 0.2 mm) and D-mode (FOV, 51 mm; voxel size, 0...
November 2016: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
Adepitan A Owosho, SaeHee K Yom, Zhiqiang Han, Kevin Sine, Nancy Y Lee, Joseph M Huryn, Cherry L Estilo
OBJECTIVE: The purpose of this study was to compare the dosimetric distribution of ipsilateral proton beam radiation therapy (PBRT) with intensity-modulated radiation therapy (IMRT) in the tooth-bearing region of the mandible in patients with head and neck cancer (HNC). STUDY DESIGN: The mandibular dosimetric distribution in patients with head and neck cancer treated with ≥60 Gy relative biologic equivalent PBRT was evaluated. The mean radiation doses were calculated in 5 regions: ipsilateral molar, ipsilateral premolar, anterior, contralateral premolar, and contralateral molar (CM) regions...
November 2016: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
David J Daegling, Kristian J Carlson, Paul Tafforeau, Darryl J de Ruiter, Lee R Berger
Fossils attributed to Australopithecus sediba are described as having phylogenetic affinities with early Homo to the exclusion of other South African australopiths. With respect to functional anatomy of mastication, one implication of this hypothesis is that A. sediba mandibles should exhibit absolutely and relatively reduced stiffness and strength in comparison to Australopithecus africanus and Paranthropus robustus jaws. Examination of cortical bone distribution in the MH 1 and MH 2 mandibles of A. sediba (evaluated against samples of Pan, early and modern Homo as well as A...
November 2016: Journal of Human Evolution
Terrence B Ritzman, Claire E Terhune, Philipp Gunz, Chris A Robinson
The fossils from Malapa cave, South Africa, attributed to Australopithecus sediba, include two partial skeletons-MH1, a subadult, and MH2, an adult. Previous research noted differences in the mandibular rami of these individuals. This study tests three hypotheses that could explain these differences. The first two state that the differences are due to ontogenetic variation and sexual dimorphism, respectively. The third hypothesis, which is relevant to arguments suggesting that MH1 belongs in the genus Australopithecus and MH2 in Homo, is that the differences are due to the two individuals representing more than one taxon...
November 2016: Journal of Human Evolution
Paul Monsarrat, Bertrand Arcaute, Ove A Peters, Elisabeth Maury, Norbert Telmon, Marie Georgelin-Gurgel, Delphine Maret
OBJECTIVES: In endodontic practice, clinicians should be aware of possible root canal anatomic variations. The aim of this study was to assess using CBCT acquisitions regarding whether one root canal anatomy of a tooth is associated with a specific anatomy of another tooth. METHODS: A total of 106 CBCT acquisitions were obtained using a CBCT scanner with 200μm voxel size. Numbers of roots and canals of the entire dentition were described. Bivariate analyses and logistic regressions were conducted to explore root canal anatomy on one tooth according to age, gender, jaw, side and the others teeth...
2016: PloS One
Mohammad Waheed El-Anwar, Hazem Saeed Amer, Ayman F Ahmed
OBJECTIVES: The objectives of this study were to study and investigate the relation between the state of the lower last molar teeth eruption and the site of the mandibular fractures. METHODS: Adult patients with traumatic mandibular fractures were included in this study. Panorama and computed tomography was performed for all patients. The relation between the state of the lower last molar eruption and criteria of the fracture was analyzed. RESULTS: In 106 patients who had 168 mandibular fractures, impacted lower third molar teeth were found to significantly increase the incidence of mandibular angle fracture while they had nonsignificant effect on incidence of other sites of mandibular fractures...
October 2016: Journal of Craniofacial Surgery
Andreas Gravvanis, Despoina Kakagia, Nick Katsikeris, Dimosthenis Tsoutsos
BACKGROUND: This report aims to first present Integra as an adjunct to complex mandibular reconstruction for intraoral lining resurfacing, and to review the literature on the use of dermal matrices for mucosal resurfacing of the floor of the mouth. CLINICAL REPORT: A 62-year-old female patient with previous ablation surgery for squamous cell carcinoma of the floor of the mouth, presented with extrusion of the mandibular plate through the chin skin and serious tongue tethering...
October 2016: Journal of Craniofacial Surgery
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"