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https://www.readbyqxmd.com/read/28926638/the-earliest-ossicone-and-post-cranial-record-of-giraffa
#1
Melinda Danowitz, John C Barry, Nikos Solounias
The oldest Giraffa material presently known consists of dental specimens. The oldest post-cranial Giraffa material belongs to the Plio-Pleistocene taxon Giraffa sivalensis, where the holotype is a third cervical vertebra. We describe three non-dental specimens from the Early Late Miocene of the Potwar Plateau, including an 8.1 million year old ossicone, 9.4 million year old astragalus, and 8.9 million year old metatarsal and refer them to Giraffa. The described ossicone exhibits remarkable similarities with the ossicones of a juvenile modern giraffe, including the distribution of secondary bone growth, posterior curvature, and concave pitted undersurface where the ossicone would attach to the skull...
2017: PloS One
https://www.readbyqxmd.com/read/28922616/novel-testing-for-corrosion-of-glass-ceramics-for-dental-applications
#2
J F Esquivel-Upshaw, F Ren, S M Hsu, F Y Dieng, D Neal, A E Clark
The effects of pH cycling immersion on the corrosion of glass-based ceramic materials were investigated by examining the silicon release level in the immersion solution and the surface morphology of the ceramic after immersion. The hypothesis that pH cycling causes more surface degradation than constant immersion was tested. An inductively coupled plasma atomic emission spectrometer was used for Si ion concentration determination and scanning electron microscopy for surface morphology analyses. Two pH cycling sequences (pH 2, 7, 10 and pH 10, 2, 7) were employed in this study...
September 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28921710/non-stick-properties-of-thin-film-coatings-on-dental-restorative-instruments
#3
Jarmo Leppäniemi, Sasha Hoshian, Kimmo Suomalainen, Toni Luoto, Ville Jokinen, Jari Koskinen
The non-stick properties of thin-film coatings on dental-restorative instruments were investigated by static contact-angle measurement using dental filler resin as well as by scanning electron microscopy of the amount of sticking dental restorative material. Furthermore, using a customized dipping measurement set-up, non-stick properties were evaluated by measuring force-by-time when the instrument was pulled out of restorative material. Minor improvements in non-stick properties were obtained with commercial diamond-like carbon and commercial polytetrafluoroethylene-based coatings...
September 18, 2017: European Journal of Oral Sciences
https://www.readbyqxmd.com/read/28917571/academy-of-dental-materials-guidance-resin-composites-part-ii-technique-sensitivity-handling-polymerization-dimensional-changes
#4
J L Ferracane, T J Hilton, J W Stansbury, D C Watts, N Silikas, N Ilie, S Heintze, M Cadenaro, R Hickel
OBJECTIVE: The objective of this work, commissioned by the Academy of Dental Materials, was to review and critically appraise test methods to characterize properties related to critical issues for dental resin composites, including technique sensitivity and handling, polymerization, and dimensional stability, in order to provide specific guidance to investigators planning studies of these properties. METHODS: The properties that relate to each of the main clinical issues identified were ranked in terms of their priority for testing, and the specific test methods within each property were ranked...
September 13, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28917087/evaluation-of-four-different-restorative-materials-for-restoration-of-the-periodontal-condition-of-wedge-shaped-defect-a-comparative-study
#5
Jian-Yong Ruan, Zheng-Lin Gong, Rui-Zhi Zhang, Zhe Zhang, Ran Xu, Da-Xu Li, Le Ren, Hong Tao
BACKGROUND This study aimed to conduct a clinical evaluation of four restorative materials for restoration of dental wedge-shaped defect (WSD) and their impacts on periodontal tissues. MATERIAL AND METHODS A total of 280 maxillary premolars with dental WSD were selected from 106 patients; the patient cases were divided into eight groups according to different combinations of restorative materials (flowable resin composites, Dyract compomers, glass ionomer cement (GIC), light-curing composite resin), and WSD positions (approaching gingival and subgingival positions)...
September 16, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28916163/effects-of-small-grit-grinding-and-glazing-on-mechanical-behaviors-and-ageing-resistance-of-a-super-translucent-dental-zirconia
#6
Xuan Lai, Wenjie Si, Danyu Jiang, Ting Sun, Longquan Shao, Bin Deng
OBJECTIVES: The purpose of this study is to elucidate the effects of small-grit grinding on the mechanical behaviors and ageing resistance of a super-translucent dental zirconia and to investigate the necessity of glazing for the small-grit ground zirconia. METHODS: Small-grit grinding was performed using two kinds of silicon carbide abrasive papers. The control group received no grinding. The unground surfaces and the ground surfaces were glazed by an experienced dental technician...
September 12, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28906500/fracture-of-reduced-diameter-zirconia-dental-implants-following-repeated-insertion
#7
Matthias Karl, Stefan Scherg, Tanja Grobecker-Karl
PURPOSE: Achievement of high insertion torque values indicating good primary stability is a goal during dental implant placement. The objective of this study was to evaluate whether or not two-piece implants made from zirconia ceramic may be damaged as a result of torque application. MATERIALS AND METHODS: A total of 10 two-piece zirconia implants were repeatedly inserted into polyurethane foam material with increasing density and decreasing osteotomy size. The insertion torque applied was measured, and implants were checked for fractures by applying the fluorescent penetrant method...
September 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28904949/bioengineering-materials-in-dental-application
#8
EDITORIAL
Wei-Jen Chang, Abe Shinichi, Shinji Kamakura, Ren-Yeong Huang, Jung-Wei Chen
No abstract text is available yet for this article.
2017: BioMed Research International
https://www.readbyqxmd.com/read/28902242/polymerization-shrinkage-stress-of-composite-resins-and-resin-cements-what-do-we-need-to-know
#9
Carlos José Soares, André Luis Faria-E-Silva, Monise de Paula Rodrigues, Andomar Bruno Fernandes Vilela, Carmem Silvia Pfeifer, Daranee Tantbirojn, Antheunis Versluis
Polymerization shrinkage stress of resin-based materials have been related to several unwanted clinical consequences, such as enamel crack propagation, cusp deflection, marginal and internal gaps, and decreased bond strength. Despite the absence of strong evidence relating polymerization shrinkage to secondary caries or fracture of posterior teeth, shrinkage stress has been associated with post-operative sensitivity and marginal stain. The latter is often erroneously used as a criterion for replacement of composite restorations...
August 28, 2017: Brazilian Oral Research
https://www.readbyqxmd.com/read/28902241/light-curing-in-dentistry-and-clinical-implications-a-literature-review
#10
Frederick Allen Rueggeberg, Marcelo Giannini, Cesar Augusto Galvão Arrais, Richard Bengt Thomas Price
Contemporary dentistry literally cannot be performed without use of resin-based restorative materials. With the success of bonding resin materials to tooth structures, an even wider scope of clinical applications has arisen for these lines of products. Understanding of the basic events occurring in any dental polymerization mechanism, regardless of the mode of activating the process, will allow clinicians to both better appreciate the tremendous improvements that have been made over the years, and will also provide valuable information on differences among strategies manufacturers use to optimize product performance, as well as factors under the control of the clinician, whereby they can influence the long-term outcome of their restorative procedures...
August 28, 2017: Brazilian Oral Research
https://www.readbyqxmd.com/read/28902240/randomized-clinical-trials-of-dental-bleaching-compliance-with-the-consort-statement-a-systematic-review
#11
Alessandro Dourado Loguercio, Bianca Medeiros Maran, Taíse Alessandra Hanzen, Alexandra Mara de Paula, Jorge Perdigão, Alessandra Reis
We reviewed the literature to evaluate: a) The compliance of randomized clinical trials (RCTs) on bleaching with the CONSORT; and b) the risk of bias of these studies using the Cochrane Collaboration risk of bias tool (CCRT). We searched the Cochrane Library, PubMed and other electronic databases, to find RCTs focused on bleaching (or whitening). The articles were evaluated in compliance with CONSORT in a scale: 0 = no description, 1 = poor description and 2 = adequate description. Descriptive analyses of the number of studies by journal, follow-up period, country and quality assessments were performed with CCRT for assessing risk of bias in RCTs...
August 28, 2017: Brazilian Oral Research
https://www.readbyqxmd.com/read/28902238/dental-ceramics-a-review-of-new-materials-and-processing-methods
#12
Lucas Hian da Silva, Erick de Lima, Ranulfo Benedito de Paula Miranda, Stéphanie Soares Favero, Ulrich Lohbauer, Paulo Francisco Cesar
The evolution of computerized systems for the production of dental restorations associated to the development of novel microstructures for ceramic materials has caused an important change in the clinical workflow for dentists and technicians, as well as in the treatment options offered to patients. New microstructures have also been developed by the industry in order to offer ceramic and composite materials with optimized properties, i.e., good mechanical properties, appropriate wear behavior and acceptable aesthetic characteristics...
August 28, 2017: Brazilian Oral Research
https://www.readbyqxmd.com/read/28902237/bonding-efficiency-and-durability-current-possibilities
#13
Adriana Bona Matos, Livia Tosi Trevelin, Beatriz Togoro Ferreira da Silva, Luciana Fávaro Francisconi-Dos-Rios, Luciana Kfouri Siriani, Marcio Vivan Cardoso
Bonding plays a major role in dentistry nowadays. Dental adhesives are used in association with composites to solve many restorative issues. However, the wide variety of bonding agents currently available makes it difficult for clinicians to choose the best alternative in terms of material and technique, especially when different clinical situations are considered. Moreover, although bonding agents allow for a more conservative restorative approach, achieving a durable adhesive interface remains a matter of concern, and this mainly due to degradation of the bonding complex in the challenging oral environment...
August 28, 2017: Brazilian Oral Research
https://www.readbyqxmd.com/read/28898732/poly-n-isopropylacrylamide-hydroxyapatite-nanocomposites-as-thermoresponsive-filling-materials-on-dentinal-surface-and-tubules
#14
Paolo Tempesti, Giovanni Simone Nicotera, Massimo Bonini, Emiliano Fratini, Piero Baglioni
HYPOTHESIS: Dental decay, asa consequence of exposure to acidic foods and drinks, represents one of the most important tooth pathologies. Recently, enamel and dentinal surface remineralization using hydroxyapatite nano- and microparticles has been proposed; however, commercial remineralizing toothpastes are quite expensive, mostly due to the high costs of hydroxyapatite. Hence, we propose a thermoresponsive hybrid nanocomposite material as filler for tooth defects. The use of thermoresponsive composite particles aims at filling exposed dentinal tubules in response to a change of temperature in the oral cavity...
September 9, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28898725/maximum-insertion-torque-of-a-novel-implant-abutment-interface-design-for-peek-dental-implants
#15
Andreas Dominik Schwitalla, Tycho Zimmermann, Tobias Spintig, Mohamed Abou-Emara, Justus Lackmann, Wolf-Dieter Müller, Alireza Houshmand
Frequent reports attest to the various advantages of tapered implant/abutment interfaces (IAIs) compared to other types of interfaces. For this reason, a conical IAI was designed as part of the development of a PEEK (polyetheretherketone)-based dental implant. This IAI is equipped with an apically displaced anti-rotation lock with minimal space requirements in the form of an internal spline. The objective of this study was the determination of the average insertion torque (IT) at failure of this design, so as to determine its suitability for immediate loading, which requires a minimum IT of 32Ncm...
September 5, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28898112/functional-odontoblastic-like-cells-derived-from-human-ipscs
#16
H Xie, N Dubey, W Shim, C J A Ramachandra, K S Min, T Cao, V Rosa
The induced pluripotent stem cells (iPSCs) have an intrinsic capability for indefinite self-renewal and large-scale expansion and can differentiate into all types of cells. Here, we tested the potential of iPSCs from dental pulp stem cells (DPSCs) to differentiate into functional odontoblasts. DPSCs were reprogrammed into iPSCs via electroporation of reprogramming factors OCT-4, SOX2, KLF4, LIN28, and L-MYC. The iPSCs presented overexpression of the reprogramming genes and high protein expressions of alkaline phosphatase, OCT4, and TRA-1-60 in vitro and generated tissues from 3 germ layers in vivo...
September 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28894542/perceptions-of-an-integrated-curriculum-among-dental-students-in-a-public-university-in-saudi-arabia
#17
Khulood Sami Hussein
BACKGROUND: Being aware of the limits of traditional discipline-based education, the Faculty of Dentistry at King Abdulaziz University (KAU) tasked basic medical science faculty members with developing a new integrated curriculum for undergraduate dental students to be applied in the 2014/2015 academic year. OBJECTIVE: To determine the students' perceptions of the restructured curriculum and elicit student suggestions for improvement. METHODS: A questionnaire was distributed to all first-year dental undergraduate students (n=192) enrolled in the academic year of 2014/2015...
July 2017: Electronic Physician
https://www.readbyqxmd.com/read/28894386/oxidative-stress-in-patients-with-endodontic-pathologies
#18
Veiko Vengerfeldt, Reet Mändar, Mare Saag, Anneli Piir, Tiiu Kullisaar
BACKGROUND: Apical periodontitis (AP) is an inflammatory disease affecting periradicular tissues. It is a widespread condition but its etiopathogenetic mechanisms have not been completely elucidated and the current treatment options are not always successful. PURPOSE: To compare oxidative stress (OxS) levels in the saliva and the endodontium (root canal [RC] contents) in patients with different endodontic pathologies and in endodontically healthy subjects. PATIENTS AND METHODS: The study group of this comparison study included 22 subjects with primary chronic apical periodontitis (pCAP), 26 with posttreatment or secondary chronic apical periodontitis (sCAP), eight with acute periapical abscess, 13 with irreversible pulpitis, and 17 healthy controls...
2017: Journal of Pain Research
https://www.readbyqxmd.com/read/28893717/secondary-surgical-decompression-of-the-inferior-alveolar-nerve-after-overfilling-of-endodontic-sealer-into-the-mandibular-canal-case-report-and-literature-review
#19
Anne-Victoire Bastien, Jérôme Adnot, Hervé Moizan, Émile Calenda, Olivier Trost
The authors report the case of a 43 year-old woman who underwent endodontic treatment of the right second mandibular molar with substantial extrusion of endodontic material into the mandibular canal. The patient presented at the Department of Oral and Maxillofacial Surgery with a persistent total anaesthesia of the lower lip and chin after two months. 2D panoramic view and 3D CT-scan examination highlighted the overfilling into the mandibular canal with a more than 50% stenosis of the canal and a consequently significant compression of the dental pedicle...
September 8, 2017: Journal of Stomatology, Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28891903/the-effectiveness-of-oxidized-regenerated-cellulose-as-a-graft-material-in-transalveolar-osteotome-sinus-lift-procedure
#20
Laith A Hussein, Thair A L Hassan
The posterior maxilla is challenged with postextraction alveolar bone resorption and pneumatization drive of the Schneiderian membrane that reduces the subantral distance. To overcome such anatomic obstacle a sinus augmentation procedure was introduced either via lateral or crestal approach depending on residual ridge height. The current study evaluated oxidized regenerated cellulose (ORC) as a grafting material versus osteon II by measuring bone gain and graft density, 24 weeks postoperatively. Twenty consecutive patients (24 cases) aged from 20 to 65 years were considered eligible after clinical and radiographic evaluation...
September 7, 2017: Journal of Craniofacial Surgery
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