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https://www.readbyqxmd.com/read/28936655/immunolocalization-of-agps-and-pectins-in-quercus-suber-gametophytic-structures
#1
Mário Luís da Costa, Ana Lúcia Lopes, Maria Isabel Amorim, Sílvia Coimbra
The arabinogalactan proteins (AGPs) are highly glycosylated proteins, ubiquitous in plants that have been linked to numerous aspects of sexual reproduction in several plant species, including the monoecious tree species Quercus suber. AGPs are found in cell membranes and cell walls of all types of tissues, including reproductive cells and organs. Pectins are cell wall components that also have been shown to change in composition and quantity during the maturations of the male and female gametophyte in cork oak...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28936294/microtensile-bond-strength-of-bulk-fill-restorative-composites-to-dentin
#2
Jyothi Mandava, Divya-Prasanna Vegesna, Ravichandra Ravi, Mohan-Rao Boddeda, Lakshman-Varma Uppalapati, M D Ghazanfaruddin
BACKGROUND: To facilitate the easier placement of direct resin composite in deeper cavities, bulk fill composites have been introduced. The Mechanical stability of fillings in stress bearing areas restored with bulk-fill resin composites is still open to question, since long term clinical studies are not available so far. Thus, the objective of the study was to evaluate and compare the microtensile bond strength of three bulk-fill restorative composites with a nanohybrid composite. MATERIAL AND METHODS: Class I cavities were prepared on sixty extracted mandibular molars...
August 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28936282/effect-of-thermocycling-and-surface-treatment-on-repair-bond-strength-of-composite
#3
Nazanin Kiomarsi, Pardis Saburian, Nasim Chiniforush, Mohammad-Javd Karazifard, Sedighe-Sadat Hashemikamangar
BACKGROUND: Repair of composite restorations is a conservative method that can increase the longevity and durability of restorations while preserving the tooth structure. Achieving a suitable bond between the old and new composite is difficult. To overcome this problem, some methods have been recommended to increase the repair bond strength of composite.This study aimed to assess the effect of aging by thermocycling (5,000 and 10,000 cycles) and mechanical surface treatments (Er,Cr:YSGG laser and bur) on repair shear bond strength of composite resin...
August 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28936037/comparison-of-resistance-to-fracture-between-three-types-of-permanent-restorations-subjected-to-shear-force-an-in-vitro-study
#4
Ramin Atash, Maiyas Arab, Hadrien Duterme, Sibel Cetik
INTRODUCTION: Our study's objective was to compare resistance to fracture between endocrown and conventional post and core restorations when subjected to shear force. MATERIALS AND METHODS: Thirty human mandibular premolars were extracted for orthodontic reasons, endodontically treated, and restored using three different methods: endocrown, glass fiber post and composite resin core, and metal post. All the crowns were made from IPS e.max ceramic. Shear forces were applied to these restorations using a test machine until breakage...
July 2017: Journal of Indian Prosthodontic Society
https://www.readbyqxmd.com/read/28932142/color-stability-and-marginal-integrity-of-interim-crowns-an-in-vitro-study
#5
Marwa I Elagra, Mohammad R Rayyan, Maisam M Alhomaidhi, Areej A Alanaziy, Mona O Alnefaie
OBJECTIVE: Many commercial dental materials are used to fabricate interim restorations. This study aimed to compare the color stability and the marginal integrity of four different interim crown materials. MATERIALS AND METHODS: An ivorine right maxillary central incisor was prepared for a full coverage all-ceramic restoration. A total of 36 specimens in the form of crowns were fabricated on the master die using four different materials (n = 9); Polymethyl methacrylate (PMMA) resin (TrimPLUS), PMMA computer-aided design, and computer-aided manufacturing (CAD-CAM) blocks (Ceramill TEMP), cold cure bis-acryl resin (Success CD), and bis-acryl resin dual-cure composite (TempSpan)...
July 2017: European Journal of Dentistry
https://www.readbyqxmd.com/read/28931868/enhancing-the-mechanical-toughness-of-epoxy-resin-composites-using-natural-silk-reinforcements
#6
Kang Yang, Sujun Wu, Juan Guan, Zhengzhong Shao, Robert O Ritchie
Strong and tough epoxy composites are developed using a less-studied fibre reinforcement, that of natural silk. Two common but structurally distinct silks from the domestic B. mori/Bm and the wild A. pernyi/Ap silkworms are selected in fabric forms. We show that the toughening effects on silk-epoxy composites or SFRPs are dependent on the silk species and the volume fraction of silk. Both silks enhance the room-temperature tensile and flexural mechanical properties of the composite, whereas the more resilient Ap silk shows a more pronounced toughening effect and a lower critical reinforcement volume for the brittle-ductile transition...
September 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28929203/effects-of-toothpastes-on-white-spot-lesions-around-orthodontic-brackets-using-quantitative-light-induced-fluorescence-qlf-an-in-vitro-study
#7
Gokcenur Gokce, Selcuk Savas, Ebru Kucukyilmaz, Ilknur Veli
AIM: The aim of this study was to investigate the effects of toothpastes with different contents on the remineralization of white spot lesions around orthodontic brackets by quantitative light-induced fluorescence (QLF). MATERIALS AND METHODS: A total of 45 freshly extracted human mandibular first molars were selected. Artificial caries lesions were created on enamel surfaces using an acidified gel system for 7 days. Initial relative fluorescence loss was calculated as the pretreatment (baseline) fluorescence value by QLF device...
September 19, 2017: Journal of Orofacial Orthopedics, Fortschritte der Kieferorthopädie
https://www.readbyqxmd.com/read/28928783/assessment-of-the-hardness-of-different-orthodontic-wires-and-brackets-produced-by-metal-injection-molding-and-conventional-methods
#8
Shiva Alavi, Marzie Kachuie
BACKGROUND: This study was conducted to assess the hardness of orthodontic brackets produced by metal injection molding (MIM) and conventional methods and different orthodontic wires (stainless steel, nickel-titanium [Ni-Ti], and beta-titanium alloys) for better clinical results. MATERIALS AND METHODS: A total of 15 specimens from each brand of orthodontic brackets and wires were examined. The brackets (Elite Opti-Mim which is produced by MIM process and Ultratrimm which is produced by conventional brazing method) and the wires (stainless steel, Ni-Ti, and beta-titanium) were embedded in epoxy resin, followed by grinding, polishing, and coating...
July 2017: Dental Research Journal
https://www.readbyqxmd.com/read/28928782/comparison-of-microleakage-of-scotchbond%C3%A2-universal-adhesive-with-methacrylate-resin-in-class-v-restorations-by-two-methods-swept-source-optical-coherence-tomography-and-dye-penetration
#9
Hamid Kermanshah, Hossein Khorsandian
BACKGROUND: One of the most important factors in restoration failure is microleakage at the restoration interface. Furthermore, a new generation of bonding, Scotchbond Universal (multi-mode adhesive), has been introduced to facilitate the bonding steps. The aim of this study was to compare the microleakage of Class V cavities restored using Scotchbond™ Universal with Scotchbond Multi-Purpose in two procedures. MATERIALS AND METHODS: Eighteen freshly extracted human molars were used in this study...
July 2017: Dental Research Journal
https://www.readbyqxmd.com/read/28928776/analytical-methods-for-the-measurement-of-polymerization-kinetics-and-stresses-of-dental-resin-based-composites-a-review
#10
REVIEW
Mehrsima Ghavami-Lahiji, Tabassom Hooshmand
Resin-based composites are commonly used restorative materials in dentistry. Such tooth-colored restorations can adhere to the dental tissues. One drawback is that the polymerization shrinkage and induced stresses during the curing procedure is an inherent property of resin composite materials that might impair their performance. This review focuses on the significant developments of laboratory tools in the measurement of polymerization shrinkage and stresses of dental resin-based materials during polymerization...
July 2017: Dental Research Journal
https://www.readbyqxmd.com/read/28927922/retrospective-clinical-evaluation-of-ceramic-onlays-placed-by-dental-students
#11
Jennifer J Archibald, Gildo Coelho Santos, Maria Jacinta Moraes Coelho Santos
STATEMENT OF PROBLEM: Indirect restorations with partial or complete occlusal surface coverage have been recommended to restore teeth with weakened walls in order to prevent cusp fracture. The success of these restorations when performed by dental students is unknown. PURPOSE: The purpose of this retrospective study was to evaluate the clinical performance of adhesively bonded ceramic onlay restorations placed by third- and fourth-year dental students. MATERIAL AND METHODS: Sixty-five ceramic onlays were placed in patients between 2009 and 2015...
September 16, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28927920/the-combination-prosthesis-a-digitally-designed-retrievable-cement-and-screw-retained-implant-supported-prosthesis
#12
Periklis Proussaefs, Abdulaziz AlHelal
The technique described offers a digital workflow for designing and fabricating a combination cement- and screw-retained implant-supported prosthesis. After making the definitive impression and definitive stone cast, the definitive combination prosthesis is digitally designed. Custom-milled titanium abutments and cementable superstructure prosthesis are designed and milled by having occlusal access channels of the prosthesis correspond to the occlusal access channels of the custom abutments. After intraorally confirming the esthetics, occlusion, and fit, the prosthesis is cemented intraorally and removed as a screw-retained prosthesis...
September 16, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28926950/development-of-a-textile-nanocomposite-as-naked-eye-indicator-of-the-exposition-to-strong-acids
#13
Isabel Pallás, Maria D Marcos, Ramón Martínez-Máñez, Jose V Ros-Lis
Chemical burns, mainly produced by acids, are a topic of concern. A new sensing material for the detection of strong acids able to be incorporated into textiles has been developed. The material is prepared by the covalent attachment of 2,2',4,4',4″-pentamethoxy triphenyl methanol to a mesoporous material which further is included in a nitro resin to obtain a colourless composite. The response of this composite to diverse acid solutions was tested showing the appearance of an intense purple colour (with a colour difference higher than 160) that can be monitored by the naked eye or could be easily digitised to feed an instrumental sensor...
September 16, 2017: Sensors
https://www.readbyqxmd.com/read/28923548/survival-of-extensively-damaged-endodontically-treated-incisors-restored-with-different-types-of-posts-and-core-foundation-restoration-material
#14
Priscilla Cardoso Lazari, Marco Aurélio de Carvalho, Altair A Del Bel Cury, Pascal Magne
STATEMENT OF PROBLEM: Which post-and-core combination will best improve the performance of extensively damaged endodontically treated incisors without a ferrule is still unclear. PURPOSE: The purpose of this in vitro study was to investigate the restoration of extensively damaged endodontically treated incisors without a ferrule using glass-ceramic crowns bonded to various composite resin foundation restorations and 2 types of posts. MATERIAL AND METHODS: Sixty decoronated endodontically treated bovine incisors without a ferrule were divided into 4 groups and restored with various post-and-core foundation restorations...
September 16, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28921710/non-stick-properties-of-thin-film-coatings-on-dental-restorative-instruments
#15
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/28918273/volatile-and-semivolatile-emissions-from-the-pyrolysis-of-almond-shell-loaded-with-heavy-metals
#16
M A Martín-Lara, N Ortuño, J A Conesa
Heavy metal-loaded almond shell was subjected to pyrolysis to understand the effect of the presence of different heavy metals on its thermal degradation. Pyrolysis behavior of native and metal-loaded samples was studied by thermogravimetric analysis. Similar shapes of thermogravimetric curves indicate that the presence of cadmium (Cd), chromium (Cr), copper (Cu), nickel (Ni) and lead (Pb) did not change the main degradation pathways of almond shell. However, the temperature at which the decomposition in each stage takes place at a higher rate and char yield was considerably modified by the presence of Cr and Ni...
September 14, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28917571/academy-of-dental-materials-guidance-resin-composites-part-ii-technique-sensitivity-handling-polymerization-dimensional-changes
#17
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
#18
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/28914253/mineral-trioxide-aggregate-induced-apical-closure-in-nonvital-immature-permanent-maxillary-incisor
#19
Meenu Bhola, Virinder Goyal, Parimala Tyagi, Tarun Kumar
Treatment of nonvital immature permanent teeth with calcium hydroxide is associated with few difficulties such as weakened tooth root, root canal reinfection, and long treatment time. Mineral trioxide aggregate (MTA) apical plug method is an alternative treatment method for open apices and has gained popularity in the recent times. This case report describes the management of a late-referral case of periapically involved, traumatized immature permanent incisor by endodontic treatment and the use of MTA apical plug...
October 2017: Journal of the Indian Society of Pedodontics and Preventive Dentistry
https://www.readbyqxmd.com/read/28914046/synergistic-effect-of-polypyrrole-intercalated-graphene-for-enhanced-corrosion-protection-of-aqueous-coating-in-3-5-nacl-solution
#20
Shihui Qiu, Wei Li, Wenru Zheng, Haichao Zhao, Liping Wang
Dispersion of graphene in water and its incorporation into waterborne resin have been rarely researched and hardly achieved owing to its hydrophobicity. Furthermore, it has largely been reported that graphene with impermeability contributed to the improved anticorrosion property. Here, we show that highly concentrated graphene aqueous solution up to 5 mg/mL can be obtained by synthesizing hydrophilic polypyrrole (PPy) nanocolloids as intercalators and ultrasonic vibration. On the basis of π-π interaction between PPy and graphene, stacked graphene sheets are exfoliated to the thickness of three to five layers without increasing defects...
September 21, 2017: ACS Applied Materials & Interfaces
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