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https://www.readbyqxmd.com/read/29618551/computer-simulations-show-that-neanderthal-facial-morphology-represents-adaptation-to-cold-and-high-energy-demands-but-not-heavy-biting
#1
Stephen Wroe, William C H Parr, Justin A Ledogar, Jason Bourke, Samuel P Evans, Luca Fiorenza, Stefano Benazzi, Jean-Jacques Hublin, Chris Stringer, Ottmar Kullmer, Michael Curry, Todd C Rae, Todd R Yokley
Three adaptive hypotheses have been forwarded to explain the distinctive Neanderthal face: (i) an improved ability to accommodate high anterior bite forces, (ii) more effective conditioning of cold and/or dry air and, (iii) adaptation to facilitate greater ventilatory demands. We test these hypotheses using three-dimensional models of Neanderthals, modern humans, and a close outgroup ( Homo heidelbergensis ), applying finite-element analysis (FEA) and computational fluid dynamics (CFD). This is the most comprehensive application of either approach applied to date and the first to include both...
April 11, 2018: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/29615564/sonic-hedgehog-signaling-and-development-of-the-dentition
#2
REVIEW
Maisa Seppala, Gareth J Fraser, Anahid A Birjandi, Guilherme M Xavier, Martyn T Cobourne
Sonic hedgehog (Shh) is an essential signaling peptide required for normal embryonic development. It represents a highly-conserved marker of odontogenesis amongst the toothed vertebrates. Signal transduction is involved in early specification of the tooth-forming epithelium in the oral cavity, and, ultimately, in defining tooth number within the established dentition. Shh also promotes the morphogenetic movement of epithelial cells in the early tooth bud, and influences cell cycle regulation, morphogenesis, and differentiation in the tooth germ...
May 31, 2017: Journal of Developmental Biology
https://www.readbyqxmd.com/read/29614462/natural-saliva-as-an-adjuvant-in-a-secondary-caries-model-based-on-streptococcus-mutans
#3
Franziska Hetrodt, Julian Lausch, Hendrik Meyer-Lueckel, Christian Apel, Georg Conrads
OBJECTIVE: Two factors for secondary caries formation were evaluated using an artificial biofilm model, saliva as additive in culture medium and bonding procedures of composite materials for artificial gap creation. DESIGN: Standardized cavities were prepared in bovine tooth samples (n = 44), treated with two different bonding pretreatments, restored and after artificial ageing incubated with Streptococcus mutans in a Mueller-Hinton-Broth-Sugar medium with or without human saliva for seven days...
March 27, 2018: Archives of Oral Biology
https://www.readbyqxmd.com/read/29613862/comparative-histomorphometric-analysis-of-maxillary-sinus-augmentation-with-deproteinized-bovine-bone-and-demineralized-particulate-human-tooth-graft-an-experimental-study-in-rabbits
#4
Xiping Xu, Dong-Seok Sohn, Hyung-Gyun Kim, Sang-Jae Lee, Yong-Suk Moon
PURPOSE: The aim of this animal study is to evaluate, by histomorphometric analysis, new bone formation in rabbit maxillary sinuses with Bio-Oss and demineralized particulate human tooth graft. MATERIALS AND METHODS: Bilateral sinus augmentation procedures were performed in 8 adult male rabbits. After preparation of replaceable bony windows on the lateral wall of the nasal cavity with a piezoelectric surgical device, deproteinized bovine graft (Bio-Oss) was grafted in the new compartment of the maxillary sinus after elevation of the sinus membrane in the control group...
April 2, 2018: Implant Dentistry
https://www.readbyqxmd.com/read/29602920/-the-influence-of-stress-strain-processes-in-tooth-enamel-on-the-marginal-permeability-of-class-i-restorations-with-a-different-design-of-the-edge-of-the-carious-cavity
#5
Юрий В Смеянов, Юрий В Лахтин
OBJECTIVE: Introduction: Of the factors affecting the marginal permeability of restorations in the teeth, the state of stress-strain processes in the enamel with different design of the edge of the carious cavity has been poorly studied. The aim of this research was to study the influence of stress-strain processes in tooth enamel on the marginal permeability of class I restorations with a different design of the edge of the carious cavity. PATIENTS AND METHODS: Materials and methods: We have examined 45 pulled out intact third molars, which were divided into three groups of 15 each, depending on class 1 carious cavities formed in them...
2018: Wiadomości Lekarskie: Organ Polskiego Towarzystwa Lekarskiego
https://www.readbyqxmd.com/read/29599807/analgesic-and-anti-inflammatory-activities-of-diethyl-ether-and-n-hexane-extract-of-polyalthia-suberosa-leaves
#6
Nelufar Yasmen, Md Abdullah Aziz, Afsana Tajmim, Mst Irin Akter, Amit Kumar Hazra, S M Mushiur Rahman
In folk medicine, Polyalthia suberosa is used as abortifacient, laxative, febrifuge analgesic, filler of tooth cavities, and anti-HIV drug and for rheumatism and various skin infections. The present study was directed to evaluate the analgesic and anti-inflammatory activities of diethyl ether and n-hexane extracts of Polyalthia suberosa leaves (PSDE and PSNH). A variety of tests including formalin-induced paw licking test, acetic acid induced writhing test, and tail immersion test were used to assess the analgesic activity...
2018: Evidence-based Complementary and Alternative Medicine: ECAM
https://www.readbyqxmd.com/read/29597039/3d-image-analysis-of-the-impact-of-toothpaste-abrasivity-on-the-progression-of-simulated-non-carious-cervical-lesions
#7
Alaa H Sabrah, Cecilia P Turssi, Frank Lippert, George J Eckert, Adam B Kelly, Anderson T Hara
OBJECTIVES: To investigate the effect of toothpaste abrasive level on the progression of non-carious cervical lesions (NCCLs) using 3D-image subtraction. METHODS: Upper first premolars were allocated into seven groups (n = 16) of toothpaste/abrasive slurries: A-Zeodent113/5%, B-Zeodent124/10%, C-Zeodent103/15%, D-Sensodyne Pronamel, E-Crest Cavity-Protection, F-Crest Pro-Health-Whitening, and G-Deionized water (DIW). Teeth were mounted on acrylic blocks, and their root surfaces covered with acrylic resin, except for 2-mm near the cemento-enamel junction that was exposed to toothbrushing...
March 26, 2018: Journal of Dentistry
https://www.readbyqxmd.com/read/29593161/influence-of-restorative-procedures-on-endodontically-treated-premolars-finite-element-analysis-of-a-ct-scan-based-three-dimensional-model
#8
Tatjana Maravić, Darko Vasiljević, Ivana Kantardžić, Tijana Lainović, Ognjan Lužanin, Larisa Blažić
An endodontically treated tooth with mesial-occlusal-distal (MOD) cavity is often restored with composite resin. Palatal and buccal cusp reduction (MODP, MODPB), and/or fiber-reinforced composite posts (P), are used in an attempt to improve the longevity of the restoration. The aim of this study was to determine the effects of these procedures on von Mises stress values and distribution in dental tissues and restorative materials using finite element analysis. Based on CT scans of an extracted second upper premolar, six 3D endodontically treated tooth models (MOD, MODP, MODPB, MOD+P, MODP+P, MODPB+P) were created...
March 28, 2018: Dental Materials Journal
https://www.readbyqxmd.com/read/29573737/polymerization-shrinkage-stress-of-resin-based-dental-materials-a-systematic-review-and-meta-analyses-of-technique-protocol-and-photo-activation-strategies
#9
REVIEW
Eliseu Aldrighi Münchow, Carine Tais Welter Meereis, Wellington Luiz de Oliveira da Rosa, Adriana Fernandes da Silva, Evandro Piva
PURPOSE: A systematic review was conducted to determine whether there were any alternative technique or additional step strategies available to reduce and control polymerization shrinkage stress development in dental resin-based restorative materials. DATA SOURCES: This report followed the PRISMA Statement. A total of 36 studies were included in this review. Two reviewers performed a literature search up to December 2016, without restriction of the year of publication, in seven databases: PubMed, Web of Science, Scopus, SciELO, LILACS, IBECS, and BBO...
March 8, 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29572979/functional-rf-trilayer-sensors-for-tooth-mounted-wireless-monitoring-of-the-oral-cavity-and-food-consumption
#10
Peter Tseng, Bradley Napier, Logan Garbarini, David L Kaplan, Fiorenzo G Omenetto
Wearable devices have emerged as powerful tools for personalized healthcare in spite of some challenges that limit their widespread applicability as continuous monitors of physiological information. Here, a materials-based strategy to add utility to traditional dielectric sensors by developing a conformal radiofrequency (RF) construct composed of an active layer encapsulated between two reverse-facing split ring resonators is applied. These small (down to 2 mm × 2 mm) passive dielectric sensors possess enhanced sensitivity and can be further augmented by functionalization of this interlayer material...
March 23, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29569460/dental-sealants-part-1-prevention-first
#11
S Colombo, L Paglia
Tooth decay is still one of the most common chronic childhood diseases in the world, even if during the last five decades measures to combat dental caries have been developed, tested and applied in many populations. Preventive care and education programmes are essential to keeping children's mouths healthy. Within the prevention methods, dental sealants play an important role in preventing the onset and the development of dental cavities.
March 2018: European Journal of Paediatric Dentistry: Official Journal of European Academy of Paediatric Dentistry
https://www.readbyqxmd.com/read/29566345/wnt-responsive-odontoblasts-secrete-new-dentin-after-superficial-tooth-injury
#12
Y Zhao, X Yuan, B Liu, U S Tulu, J A Helms
The objective of our experiments was to identify new therapeutic strategies to stimulate dentin formation in an adult tooth. To address this objective, we evaluated dentin production in 2 acute trauma models: one involving a pulp exposure and the other involving a superficial dentin injury. Molecular, cellular, and histologic analyses revealed that in response to a severe injury, where the pulp is exposed to the oral cavity, cell death is rampant and the repair response initiates from surviving pulp cells and, to a lesser extent, surviving odontoblasts...
March 1, 2018: Journal of Dental Research
https://www.readbyqxmd.com/read/29518512/septic-carotid-endarterectomy-patch-as-a-result-of-pre-operative-tooth-extraction
#13
K C Fok, Y C Chan, Y Law, S W Cheng
Infected carotid patch are rare. We present a gentleman who had an elective carotid endarterectomy with Dacron patch closure for symptomatic carotid stenosis under regional anaesthesia, and presented one month later with a discharging sinus at the lower aspect of the neck wound. CT scan showed a rim enhancing collection next to the carotid bifurcation. He subsequently underwent patch excision and repair with autologous saphenous vein graft, with good recovery. Of significance was that he had dental extraction for a loose tooth one day before the index operation as advised by the anesthestist...
March 5, 2018: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/29513214/biochemical-stability-and-interactions-of-dental-resin-composites-and-adhesives-with-host-and-bacteria-in-the-oral-cavity-a-review
#14
Maher Bourbia, Yoav Finer
The use of resin composites and adhesives in dental restorations is ubiquitous. However, the longevity of resin composites is less than that of comparable restorative materials, mainly because of higher fracture rates and greater prevalence of secondary caries. Dental resin composites and adhesives contain ester links, which are vulnerable to biochemical hydrolysis by esterase activity from human saliva and bacteria. In this article, we review biodegradation processes that occur in the oral cavity and their contribution to the premature failure of resin composites...
January 2018: Journal—Canadian Dental Association, Journal de L'Association Dentaire Canadienne
https://www.readbyqxmd.com/read/29497445/evaluation-of-cavity-size-kind-and-filling-technique-of-composite-shrinkage-by-finite-element
#15
Toloo Jafari, Homayoon Alaghehmad, Ehsan Moodi
Background: Cavity preparation reduces the rigidity of tooth and its resistance to deformation. The purpose of this study was to evaluate the dimensional changes of the repaired teeth using two types of light cure composite and two methods of incremental and bulk filling by the use of finite element method. Materials and Methods: In this computerized in vitro experimental study, an intact maxillary premolar was scanned using cone beam computed tomography instrument (SCANORA, Switzerland), then each section of tooth image was transmitted to Ansys software using AUTOCAD...
January 2018: Dental Research Journal
https://www.readbyqxmd.com/read/29493244/surgically-facilitated-orthodontic-therapy-optimizing-dentoalveolar-bone-and-space-appropriation-for-facially-prioritized-interdisciplinary-dentofacial-therapy
#16
George A Mandelaris, Bradley S DeGroot, Robert Relle, Brian Shah, Iwei Huang, Brian S Vence
Comorbidities that negatively impact orthodontic (malocclusion), periodontal (periodontitis, deficient dentoalveolar bone volume, mucogingival), and prosthetic (structural integrity compromise from caries, attrition, and erosion) conditions can affect the general health of the patient. In addition, emerging data highlights the importance of undiagnosed airway volume deficiencies and sleep-disordered breathing conditions in the adult and pediatric population. Deficiencies in dentoalveolar bone and discrepancies in skeletal relationships can impact the volume of hard- and soft-tissue structures of the periodontium and decrease oral cavity volume...
March 2018: Compendium of Continuing Education in Dentistry
https://www.readbyqxmd.com/read/29491588/awareness-and-knowledge-of-periodontal-disease-among-saudi-primary-school-teachers-in-aseer-region
#17
Abdulrahman Ahmed Mohammed Alshehri, Fawaz Dhafer Abdullah Alshehri, Khalid Yahya Abdo Hakami, Zayed Ali Ahmad Assiri, Abdulrahim Abdullah Mohammed Alshehri, Zafer Ali Zafer Alqahtani
Background: The consequences of periodontal disease are not limited to the oral cavity. As schools are considered to be one of the principal systems in preventive oral health, teachers' knowledge pertaining to the periodontal disease, their awareness with regard to its implications and their role in increasing the awareness of the students regarding this disease comprises only one aspect with respect to the prevention of the periodontal disease. Therefore, the aim of this study is to investigate the baseline awareness and knowledge of Saudi primary school teachers regarding the periodontal disease...
September 2017: Journal of Indian Society of Periodontology
https://www.readbyqxmd.com/read/29485557/closure-of-oroantral-communication-with-plasma-rich-fibrin-membrane
#18
Umut Demetoglu, Hakan Ocak, Suheyb Bilge
Oroantral communication (OAC) is the opening between the maxillary sinus and oral cavity. It may cause oroantral fistula or maxillary sinusitis if left untreated. The surgical closure of the OAC within 48 hours was recommended to avoid the complications like sinus infections. The aim of this study is to evaluate the treatment of OACs with plasma-rich fibrin (PRF) which is safe and easy to implement in the OACs.This study was conducted with the patients, who required the treatment of the OAC, which was developed after the posterior maxillary tooth extraction in the Dental and Maxillofacial Department of the Faculty of Dentistry in Adnan Menderes University...
February 26, 2018: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/29481692/decreasing-revision-surgery-in-famm-flap-reconstruction-of-the-oral-cavity-traditional-versus-modified-harvesting-technique
#19
Badr Ibrahim, Akram Rahal, Eric Bissada, Apostolos Christopoulos, Sami P Moubayed, Louis Guertin, Jean-Claude Tabet, Marie-Jo Olivier, Tareck Ayad
OBJECTIVE: To compare the surgical and functional outcomes between two harvesting techniques for the inferiorly based facial artery musculomucosal (FAMM) flap for oral cavity and oropharynx reconstructions. METHODS: Multicenter retrospective chart review. RESULTS: We reviewed 55 cases of FAMM flap, including 29 traditional cases and 26 performed using the modified harvesting method. The overall rate of surgical re-intervention in the traditional group was 31% (n = 9 of 29) and 15% (n = 4 of 26) in the modified group (P = 0...
February 26, 2018: Laryngoscope
https://www.readbyqxmd.com/read/29477178/inner-tooth-morphology-of-homo-erectus-from-zhoukoudian-new-evidence-from-an-old-collection-housed-at-uppsala-university-sweden
#20
Clément Zanolli, Lei Pan, Jean Dumoncel, Ottmar Kullmer, Martin Kundrát, Wu Liu, Roberto Macchiarelli, Lucia Mancini, Friedemann Schrenk, Claudio Tuniz
Locality 1, in the Lower Cave of the Zhoukoudian cave complex, China, is one of the most important Middle Pleistocene paleoanthropological and archaeological sites worldwide, with the remains of c. 45 Homo erectus individuals, 98 mammalian taxa, and thousands of lithic tools recovered. Most of the material collected before World War II was lost. However, besides two postcranial elements rediscovered in China in 1951, four human permanent teeth from the 'Dragon Bone Hill,' collected by O. Zdansky between 1921 and 1923, were at the time brought to the Paleontological Institute of Uppsala University, Sweden, where they are still stored...
March 2018: Journal of Human Evolution
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