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https://www.readbyqxmd.com/read/28549467/the-prediction-diagnosis-and-management-of-complications-in-monochorionic-twin-pregnancies-the-ommit-optimal-management-of-monochorionic-twins-study
#1
Fiona L Mackie, R Katie Morris, Mark D Kilby
BACKGROUND: Monochorionic twin pregnancies are at increased risk of complications due to sharing a single placenta and potentially developing unbalanced vascular anastomoses. Complications include twin-twin transfusion syndrome (TTTS) which affects 10-15% monochorionic twins, and if untreated has a 70-90% perinatal loss rate. We are currently unable to predict which twins will develop complications or to what severity. We have previously shown differences in angiogenic and placental growth factors in maternal blood in pregnancies complicated by TTTS compared to twin pregnancies not complicated by TTTS but matched for gestation...
May 26, 2017: BMC Pregnancy and Childbirth
https://www.readbyqxmd.com/read/28548314/scorpionate-complexes-of-aza-18-crown-6-containing-fluoronitrophenyl-substituents-as-studied-by-esi-ms
#2
Rafał Frański, Magdalena Onyszkiewicz, Błażej Gierczyk
RATIONALE: Coordination of a metal cation by a nitro group is rare and the interaction between them is usually weak. Examples of complexes in which such an interaction takes place are metal complexes of cyclams containing nitrophenyl or nitrobenzyl substituents. It seemed to be interesting to check if in the complexes of respective crown ether conjugates the interaction can also take place. METHODS: We synthesized the respective conjugates of aza-18-crown-6, namely fluoro-substituted N-nitrophenylaza-18C6 conjugates...
May 26, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28547377/the-excessive-enrichment-of-trace-elements-in-migratory-and-breeding-red-crowned-cranes-grus-japonensis-in-china
#3
Luo Jinming, Wang Yongjie, Gao Zhongyan, Wang Wenfeng
The excessive enrichment of trace elements, such as Pb and Cd, from food may contribute to the decline of migratory red-crowned cranes (Grus japonensis) in China. To test this prediction, we determined the concentrations of Pb and Cd, as well as further macro and trace elements (Ca, Mg, Cu, Zn) in the target species and their prey (sediment, reed root, mollusk, arthropods, and common fish species) in both the wintering (Yancheng wetland) and breeding sites (Zhalong wetland) of cranes in China. The maximum concentrations of Pb (130 mg kg(-1) dry weight (dw)) and Cd (10...
May 26, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28545870/strain-transfer-behavior-of-different-planning-options-for-mandibular-single-molar-replacement
#4
Eduardo Bortolas de Carvalho, Paulo Eduardo Herbst, Adriana Cláudia Lapria Faria, Ricardo Faria Ribeiro, Priscila Paganini Costa, Rodrigo Tiossi
STATEMENT OF PROBLEM: The loss of the first molar and second premolar could lead to mesial movement of the second molar, thus limiting the restoration space for the 2 missing teeth. Placement of a larger first molar is a common choice, but the best implant number and position option remain controversial. PURPOSE: The purpose of this in vitro study was to test different planning options for replacing the mandibular first molar. MATERIAL AND METHODS: Two polyoxymethylene models simulated first molar edentulous spaces of 11 mm (conventional size first molar: control group) and 14 mm (enlarged first molar: all remaining groups other than control)...
May 23, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28545869/evaluation-of-marginal-fit-of-single-implant-supported-metal-ceramic-crowns-prepared-by-using-presintered-metal-blocks
#5
Barış Paşalı, Duygu Saraç, Necati Kaleli, Yakup Sinasi Saraç
STATEMENT OF PROBLEM: Recently, presintered metal blocks for nonprecious and precious metal implant-supported restorations have gained popularity in computer-aided design and computer-aided manufacturing (CAD-CAM) systems. However, few studies have evaluated the marginal discrepancy of implant-supported restorations made with these new alloy systems. PURPOSE: The purpose of this in vitro study was to compare the milling-sintering method with the lost-wax and milling methods in terms of the marginal fit of implant-supported metal-ceramic restorations...
May 23, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28544663/from-song-dialects-to-speciation-in-white-crowned-sparrows
#6
David P L Toews
The behavioural signals used in mate selection are a key component in the evolution of premating isolating barriers and, subsequently, the formation of new species. The importance of mating signals has a long tradition of study in songbirds, where many species differ in their song characteristics. In oscine songbirds, individual birds usually learn their songs from a tutor. Mistakes during learning can help generate geographic dialects, akin to those within human language groups. In songbirds, dialect differences can often be substantial and there is an intuitive connection between the evolution of song amongst populations at a small scale, and the more substantive song differences between bird species and presumably used in species recognition...
June 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28544578/clinical-assessment-of-interdental-papilla-competency-parameters-in-the-esthetic-zone
#7
Karuna Joshi, C S Baiju, Himanshu Khashu, Sumidha Bansal, Isha B Maheswari
BACKGROUND: Interdental papilla occupies the space between two adjacent teeth. Its contour and health are regarded with utmost importance in esthetic dental therapy. The loss of papillary height can result in open gingival embrasures, phonetic problems, food impaction, and esthetic concerns: therefore in order to prevent its loss and to better understand the challenges of regenerating the lost gingival papillae, it is crucial to recognize the factors that influence papilla form. AIM: The purpose of this study is to evaluate various factors associated with the fill of interdental spaces by gingival papillae MATERIAL AND METHODS: 150 interdental papillae in 30 patients were assessed with clinical and study models...
May 25, 2017: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/28544269/a-novel-approach-for-early-evaluation-of-orthodontic-process-by-a-numerical-thermo-mechanical-analysis
#8
Z Heidary, A Mojra, M Shirazi, M Bazargan
The main objective of this paper is to propose a novel method that provides an opportunity to evaluate an orthodontic process at early phase of the treatment. This was accomplished by finding out a correlation between the applied orthodontic force and thermal variations in the tooth structure. To this end, geometry of the human tooth surrounded by the connective soft tissue called the periodontal ligament and the bone was constructed by employing dental CT scan images of a specific case. The periodontal ligament was modeled by finite strain viscoelastic model through a nonlinear stress-strain relation (hyperelasticity) and nonlinear stress-time relation (viscoelasticity)...
May 21, 2017: International Journal for Numerical Methods in Biomedical Engineering
https://www.readbyqxmd.com/read/28544215/anterior-single-implants-with-different-neck-designs-5-year-results-of-a-randomized-clinical-trial
#9
Laurens den Hartog, Henny J A Meijer, Arjan Vissink, Gerry M Raghoebar
BACKGROUND: The design of the implant neck might be significant for preservation of marginal bone. PURPOSE: To compare the 5-year radiographic and clinical outcome of single anterior implants provided with a smooth neck, a rough neck or a scalloped rough neck. MATERIALS AND METHODS: 93 Patients with a missing anterior tooth in the maxilla were included. At random, patients received an implant with a 1.5 mm smooth neck ("smooth group"), a rough neck with grooves ("rough group") or a scalloped rough neck with grooves ("scalloped group")...
May 23, 2017: Clinical Implant Dentistry and related Research
https://www.readbyqxmd.com/read/28542710/behavioral-inferences-from-the-high-levels-of-dental-chipping-in-homo-naledi
#10
Ian Towle, Joel D Irish, Isabelle De Groote
OBJECTIVES: A variety of mechanical processes can result in antemortem dental chipping. In this study, chipping data in the teeth of Homo naledi are compared with those of other pertinent dental samples to give insight into their etiology. MATERIALS AND METHODS: Permanent teeth with complete crowns evidencing occlusal wear were examined macroscopically. The location, number, and severity of fractures were recorded and compared to those found in samples of two other South African fossil hominin species and in samples of nonhuman primates (n = 3) and recent humans (n = 7)...
May 24, 2017: American Journal of Physical Anthropology
https://www.readbyqxmd.com/read/28542040/failure-of-osseointegrated-dental-implant-after-alveolar-nerve-transposition-a-report-of-an-unusual-complication-and-surgical-management
#11
Renato da Costa Ribeiro, Anibal Henrique Barbosa Luna, Cássio Edvard Sverzut, Alexander Tadeu Sverzut
PURPOSE: To describe an unusual case of mandibular fracture after osseointegrated dental implant removal placed after inferior alveolar nerve transposition. REPORT OF CASE: The patient underwent inferior nerve transposition for implant placement due to lack of interarch space. Two months after metal-ceramic crowns installation, the patient began to complain of pain in the region of the implant. In an attempt to remove the implant, there was a fracture of the implant, and only two third of it was removed, leaving only the apical portion of the implant in the mandible...
May 24, 2017: Implant Dentistry
https://www.readbyqxmd.com/read/28541561/effects-of-rainfall-exclusion-on-leaf-gas-exchange-traits-and-osmotic-adjustment-in-mature-canopy-trees-of-dryobalanops-aromatica-dipterocarpaceae-in-a-malaysian-tropical-rain-forest
#12
Yuta Inoue, Tomoaki Ichie, Tanaka Kenzo, Aogu Yoneyama, Tomo'omi Kumagai, Tohru Nakashizuka
Climate change exposes vegetation to unusual levels of drought, risking a decline in productivity and an increase in mortality. It still remains unclear how trees and forests respond to such unusual drought, particularly Southeast Asian tropical rain forests. To understand leaf ecophysiological responses of tropical rain forest trees to soil drying, a rainfall exclusion experiment was conducted on mature canopy trees of Dryobalanops aromatica Gaertn.f. (Dipterocarpaceae) for 4 months in an aseasonal tropical rain forest in Sarawak, Malaysia...
May 24, 2017: Tree Physiology
https://www.readbyqxmd.com/read/28540937/dental-caries
#13
REVIEW
Nigel B Pitts, Domenick T Zero, Phil D Marsh, Kim Ekstrand, Jane A Weintraub, Francisco Ramos-Gomez, Junji Tagami, Svante Twetman, Georgios Tsakos, Amid Ismail
Dental caries is a biofilm-mediated, sugar-driven, multifactorial, dynamic disease that results in the phasic demineralization and remineralization of dental hard tissues. Caries can occur throughout life, both in primary and permanent dentitions, and can damage the tooth crown and, in later life, exposed root surfaces. The balance between pathological and protective factors influences the initiation and progression of caries. This interplay between factors underpins the classification of individuals and groups into caries risk categories, allowing an increasingly tailored approach to care...
May 25, 2017: Nature Reviews. Disease Primers
https://www.readbyqxmd.com/read/28540108/scalpel-depigmentation-and-surgical-crown-lengthening-to-improve-anterior-gingival-esthetics
#14
K C Chethana, K Pradeep
A smile is a mesmerizing expression of joy, success, courtesy and reveals self-confidence. The harmony of the smile is determined not only by the shape, position and the color of teeth, but also by the gingival architecture. Gingival tissues form an important part of what we can consider to be a pleasing smile. The elegance of this pleasant smile could be, affected by highly pigmented gingiva. This gingival pigmentation occurs as a result of melanin granules, which are produced by melanoblast. Although melanin pigmentation does not present a medical problem, demand for cosmetic therapy is commonly sort by people with moderately pigmented gingiva...
November 2016: Annals of Medical and Health Sciences Research
https://www.readbyqxmd.com/read/28540090/orthodontic-intervention-to-impacted-and-transposed-lower-canines
#15
Nihat Kılıç, Hüsamettin Oktay
Impacted and transposed teeth cause serious difficulties in tooth eruption and movement as well as esthetic and functional outcomes. Proper treatment planning including good biomechanical control is essential in order to avoid side effects during traction and aligning of the impacted and/or transposed teeth. The purpose of the present study was to present a successfully treated female patient having transposed and impacted lower canines by means of a modified lingual arch and fixed orthodontic appliance. A female patient aged 13 years and 9 months presented to the orthodontic department with a chief compliant of bilateral spacing and missing teeth in mandibular dentition...
2017: Case Reports in Dentistry
https://www.readbyqxmd.com/read/28535807/identification-of-putative-olfactory-g-protein-coupled-receptors-in-crown-of-thorns-starfish-acanthaster-planci
#16
Rebecca E Roberts, Cherie A Motti, Kenneth W Baughman, Noriyuki Satoh, Michael R Hall, Scott F Cummins
BACKGROUND: In marine organisms, and in particular for benthic invertebrates including echinoderms, olfaction is a dominant sense with chemosensation being a critical signalling process. Until recently natural product chemistry was the primary investigative approach to elucidate the nature of chemical signals but advances in genomics and transcriptomics over the last decade have facilitated breakthroughs in understanding not only the chemistry but also the molecular mechanisms underpinning chemosensation in aquatic environments...
May 23, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28531807/high-post-natal-mortality-associated-with-defects-in-lung-maturation-and-reduced-adiposity-in-mice-with-gestational-exposure-to-high-fat-and-n-acetylcysteine
#17
Lyda Williams, Maureen J Charron, Rani S Sellers
Studies have demonstrated that maternal consumption of a high fat diet (HFD) increases offspring susceptibility to metabolic disease. This study was initiated to identify the mechanistic contribution of oxidative stress on this phenomenon. Two weeks prior to mating, dams were fed either HFD or Control diet with or without supplementation with the anti-oxidant N-acetylcysteine (NAC). Pups born to HFD dams had reduced crown rump length (CRL) at birth and higher neonatal mortality compared to pups from Control dams...
May 14, 2017: Research in Veterinary Science
https://www.readbyqxmd.com/read/28530764/sb10-2-and-sb2-2-found-in-k-18-crown-6-6-sb10-sb4-mo-co-3-2-%C3%A2-2en-two-missing-family-members
#18
Huapeng Ruan, Lulu Wang, Zhenyu Li, Li Xu
Reaction of KMnSb and C7H8Mo(CO)3 produced Sb10(2-) and Sb2(2-) found in [K(18-crown-6)]6[Sb10][Sb4{Mo(CO)3}2]·2en (1·2en) adding two new family members for antimony polyanions. The unusually short Sb-Sb bond in the Sb2 subunits of 1 reveals the formation of the second doubly bonded diatomic anion between heavy elements following Bi2(2-), and the first example of such doubly bonded anions stabilized by metal carbonyl groups.
May 22, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28529868/bone-inflammation-bone-infection-and-dental-implants-failure-histological-and-cytological-aspects-related-to-cement-excess
#19
Marco Tatullo, Massimo Marrelli, Filiberto Mastrangelo, Enrico Gherlone
Background: Dental implant failure can recognize several causes and many of them are quite preventable with the right knowledge of some clinical critical factors. Aim of this paper is to investigate about the histological aspects related to dental implants failure in such cases related to cement excess, how such histological picture can increase the risk of bacterial infections and how the different type of cement can interact with osteoblasts in-vitro. Methods: We randomly selected 5 patients with a diagnosis of dental implant failure requiring to be surgically removed: in all patients was observed an excess of dental cement around the failed implants...
2017: J Bone Jt Infect
https://www.readbyqxmd.com/read/28527853/influence-of-intracanal-materials-in-vertical-root-fracture-pathway-detection-with-cone-beam-computed-tomography
#20
Kamile Leonardi Dutra, Camila Pachêco-Pereira, Eduardo Antunes Bortoluzzi, Carlos Flores-Mir, Manuel O Lagravère, Márcio Corrêa
INTRODUCTION: Investigating the vertical root fracture (VRF) pathway under different clinical scenarios may help to diagnose this condition properly. We aimed to determine the capability and intrareliability of VRF pathway detection through cone-beam computed tomographic (CBCT) imaging as well as analyze the influence of different intracanal and crown materials. METHODS: VRFs were mechanically induced in 30 teeth, and 4 clinical situations were reproduced in vitro: no filling, gutta-percha, post, and metal crown...
May 17, 2017: Journal of Endodontics
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