Read by QxMD icon Read

Restorative materials

Elena Lopez-Rodriguez, Gemma Gay-Jordi, Adele Mucci, Nico Lachmann, Anna Serrano-Mollar
Lung surfactant is a complex mixture of lipids and proteins lining the alveolar epithelium. At the air-liquid interface, surfactant lowers surface tension, avoiding alveolar collapse and reducing the work of breathing. The essential role of lung surfactant in breathing and therefore in life, is highlighted by surfactant deficiency in premature neonates, which causes neonatal respiratory distress syndrome and results in early death after birth. In addition, defects in surfactant metabolism alter lung homeostasis and lead to disease...
October 25, 2016: Cell and Tissue Research
Wei Feng, Kai Xiao, Wenbing Zhou, Duanwei Zhu, Yiyong Zhou, Yu Yuan, Naidong Xiao, Xiaoqiong Wan, Yumei Hua, Jianwei Zhao
Eichhornia crassipes (EC, water hyacinth) has gained attention due to its alarming reproductive capacity, which subsequently leads to serious ecological damage of water in many eutrophic lakes in the world. The traditional mechanical removal methods have disadvantages. They squander this valuable lignocellulosic resource. Meanwhile, there is a bottleneck for the subsequently reasonable and efficient utilization of EC biomass on a large scale after phytoremediation of polluted water using EC. As a result, the exploration of effective EC utilization technologies has become a popular research field...
October 19, 2016: Bioresource Technology
Palena A Pinto, Guillaume Colas, Tobin Filleter, Grace M De Souza
Yttria-stabilized tetragonal zirconia polycrystals (3Y-TZP) is a ceramic material used in indirect dental restorations. However, phase transformation at body temperature may compromise the material's mechanical properties, affecting the clinical performance of the restoration. The effect of mastication on 3Y-TZP aging has not been investigated. 3Y-TZP specimens (IPS E-max ZirCAD and Z5) were aged in three different modes (n=13): no aging (control), hydrothermal aging (HA), or chewing simulation (CS). Mechanical properties and surface topography were analyzed...
October 26, 2016: Microscopy and Microanalysis
Andrew B Schenkel, Ivy Peltz, Analia Veitz-Keenan
BACKGROUND: Resin-based composite (RBC) is currently accepted as a viable material for the restoration of caries for posterior permanent teeth requiring surgical treatment. Despite the fact that the thermal conductivity of the RBC restorative material closely approximates that of natural tooth structure, postoperative hypersensitivity is sometimes still an issue. Dental cavity liners have historically been used to protect the pulp from the toxic effects of some dental restorative materials and to prevent the pain of thermal conductivity by placing an insulating layer between restorative material and the remaining tooth structure...
October 25, 2016: Cochrane Database of Systematic Reviews
T Kühlein, F Madlo-Thiess, V Wambach, S Schaffer
Background: Quality management (QM) became mandatory for the ambulatory sector of the German health care system 10 years ago. Objectives: The aim of this study was to find out how general practitioners (GPs) perceived the introduction of this measure, how they see it today and what they expect of the future concerning QM. Materials and Methods: In a qualitative study, interviews following a semi-structured guideline with GPs were conducted. Following transcription, interviews were coded in triangulation, first inductively, then deductively until saturation was reached...
October 25, 2016: Das Gesundheitswesen
Alexandre Cestari
INTRODUCTION: Amorphous aluminosilicates glasses containing fluorine, phosphorus and calcium are used as a component of the glass ionomer dental cement. This cement is used as a restorative, basis or filling material, but presents lower mechanical resistance than resin-modified materials. The Sol-Gel method is a possible route for preparation of glasses with lower temperature and energy consumption, with higher homogeneity and with uniform and nanometric particles, compared to the industrial methods Glass ionomer cements with uniform, homogeneous and nanometric particles can present higher mechanical resistance than commercial ionomers...
October 20, 2016: Journal of Dentistry
Ramiro Chavez-Montoya, Osvaldo Araujo-Ramírez, Irma Yolanda Castillo-López, Luis Humberto Govea-Camacho
BACKGROUND: Silent sinus or imploding antrum syndrome is a very rare condition, consisting of a usually asymptomatic spontaneous collapse of the sinus walls and floor of the orbit. It is associated with negative pressures, and when this occurs, it presents with manifestations such as enophthalmos, hypoglobus, and tilt flow orbital floor. As its incidence is very low, it is frequently missed as a diagnosis, and in fact there are currently fewer than 150 cases reported in the literature...
October 20, 2016: Cirugia y Cirujanos
Sara Guizzo, Cristina Tortolini, Federico Pepi, Francesca Leonelli, Franco Mazzei, Francesca Di Turo, Gabriele Favero
Traditional cleaning methods with organic solvents often are not suitable for removal of aged resin so researchers have to find new formulations. In this work, a case study is reported in which new microemulsions were applied on the surface of a painting covered by some aged resin layers used during a previous restoration. Based on the quality of the intervention and the analysis of a sample of the varnish carried out with both MALDI-TOF and ATR-IR spectrometers, it was conjectured that this undesired material could be an acrylic polymer...
October 23, 2016: Natural Product Research
Hossein E Jazayeri, Mohammadreza Tahriri, Mehdi Razavi, Kimia Khoshroo, Farahnaz Fahimipour, Erfan Dashtimoghadam, Luis Almeida, Lobat Tayebi
Tissue regeneration is rapidly evolving to treat anomalies in the entire human body. The production of biodegradable, customizable scaffolds to achieve this clinical aim is dependent on the interdisciplinary collaboration among clinicians, bioengineers and materials scientists. While bone grafts and varying reconstructive procedures have been traditionally used for maxillofacial defects, the goal of this review is to provide insight on all materials involved in the progressing utilization of the tissue engineering approach to yield successful treatment outcomes for both hard and soft tissues...
January 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Yuliang Dong, Weiqing Liu, Yiling Lei, Tingxi Wu, Shiwen Zhang, Yuchen Guo, Yuan Liu, Demeng Chen, Quan Yuan, Yongyue Wang
Oral infectious diseases may lead to bone loss, which makes it difficult to achieve satisfactory restoration. The rise of multidrug resistant bacteria has put forward severe challenges to the use of antibiotics. Silver (Ag) has long been known as a strong antibacterial agent. In clinic, gelatin sponge with colloid silver is used to reduce tooth extraction complication. To investigate how this material affect infected bone defects, methicillin-resistant Staphylococcus aureus (MRSA) infected 3-mm-diameter cranial defects were created in adult female Sprague-Dawley rats...
January 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Robert J Gillespie, Derrick M Knapik, Ozan Akkus
Rotator cuff injuries are common in both young and elderly patients. Despite improvements in instrumentation and surgical techniques, the failure rates following tendon reconstruction remain unacceptably high. To improve outcomes, graft patches have been developed to provide mechanical strength and to furnish a scaffold for biologic growth across the delicate tendon-bone junction. Although no patch effectively re-creates the structured, highly organized system of prenatal tendon development, augmenting rotator cuff repair may help restore native tendon-to-bone attachment while reproducing the mechanical and biologic properties of native tendon...
October 20, 2016: Journal of the American Academy of Orthopaedic Surgeons
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
A C Shortall, R B Price, L MacKenzie, F J T Burke
Light curing is a critical step in the restorative process when using light-activated resin-based composites, but it is frequently not given the attention it deserves. The selection of a reliable light curing unit (LCU) that meets the practitioner's needs is an important equipment purchase. Using an inappropriate LCU may seriously compromise the quality of care without the practitioner realising their mistake until years later. The importance of the subject is reflected by the rapidly increasing use of light-cured composites and the decline in the use of amalgam...
October 21, 2016: British Dental Journal
Kelvin I Afrashtehfar, Elham Emami, Motahareh Ahmadi, Samer Abi-Nader, Faleh Tamimi
STATEMENT OF PROBLEM: No knowledge synthesis exists concerning when to use a direct restoration versus a complete-coverage indirect restoration in posterior vital teeth. PURPOSE: The purpose of this systematic review was to identify the failure rate of conventional single-unit tooth-supported restorations in posterior permanent vital teeth as a function of remaining tooth structure. MATERIAL AND METHODS: Four databases were searched electronically, and 8 selected journals were searched manually up to February 2015...
October 17, 2016: Journal of Prosthetic Dentistry
Doğu Ömür Dede, Gözlem Ceylan, Burak Yilmaz
STATEMENT OF PROBLEM: Resin cements are available in various shades from different manufacturers. However, there is no standard for the optical properties of these cements, which may result in differences in the color of translucent ceramic restorations. PURPOSE: The purpose of this in vitro study was to evaluate the effects of different shades and brands of resin cements on the color of a lithium disilicate ceramic. MATERIALS AND METHODS: Ten ceramic disks (11×1...
October 17, 2016: Journal of Prosthetic Dentistry
Massimo Del Fabbro, Stefano Corbella, Patrick Sequeira-Byron, Igor Tsesis, Eyal Rosen, Alessandra Lolato, Silvio Taschieri
BACKGROUND: When primary root canal therapy fails, periapical lesions can be retreated with or without surgery. Root canal retreatment is a non-surgical procedure that involves removal of root canal filling materials from the tooth, followed by cleaning, shaping and obturating of the canals. Root-end resection is a surgical procedure that involves exposure of the periapical lesion through an osteotomy, surgical removal of the lesion, removal of part of the root-end tip, disinfection and, commonly, retrograde sealing or filling of the apical portion of the remaining root canal...
October 19, 2016: Cochrane Database of Systematic Reviews
S Bektas Donmez, S Uysal, A Dolgun, M D Turgut
AIM: The purpose of this study is to evaluate the clinical performance of three different restorative materials in primary teeth according to the FDI criteria. MATERIALS AND METHODS: Resin-modified glass ionomer cement, compomer and composite resin restorations (n=93) were made in 31 patients. The restorations were clinically evaluated at baseline, 6th, 12th and 18th month with the FDI criteria. RESULTS: The cumulative survival rate after 18 months was found to be 90...
September 2016: European Journal of Paediatric Dentistry: Official Journal of European Academy of Paediatric Dentistry
Andrej M Kielbassa, Georg Glockner, Michael Wolgin, Karl Glockner
BACKGROUND: With the Minamata Convention the use of mercury will be phased down, and this undoubtedly will have an effect on dental treatment regimens and economic resources. Composite resin restorations are considered viable alternatives to amalgam fillings; however, these will not be covered completely by health insurance systems in many countries. Recently, a high-viscosity glass-ionomer cement (hvGIC) processed with a resinous coating (RC) has been introduced, and has been marketed as a restorative material in load-bearing Class I cavities (and in Class II cavities with limited size), thus serving as a possible alternative to amalgam fillings...
2016: Quintessence International
Neeru Choudhary, Sameer R Verma, Shubhda Sagar, Eram Fatima
Posterior capsule rupture with herniated lens fragment in the vitreous cavity on magnetic resonance imaging has not been reported in India until now; however, it has been reported in other countries. Therefore, this study reports the case of a 15-year-old boy presenting with posttraumatic loss of vision in the right eye due to posterior capsular rupture and herniation of lens material into the vitreous cavity, which was detected by B-scan ultrasonography and magnetic resonance imaging as no ophthalmic examination was possible due to the posttraumatic cataract...
2016: International Medical Case Reports Journal
Shintaro Sukegawa, Takahiro Kanno, Daiki Nagano, Akane Shibata, Yuka Sukegawa-Takahashi, Yoshihiko Furuki
INTRODUCTION: In recent years, bioresorbable plates have undergone remarkable development. However, there has been no attendant improvement in their strength, because strength requires thickness, and complications such as palpability are related to the thickness of bioresorbable plate systems. In this clinical study, we compared the surgical management of zygomatic fractures using newly developed thinner bioresorbable materials or conventional titanium miniplates. METHODS: Twelve patients with zygomatic fractures were randomly divided equally into 2 groups (6 with new bioresorbable osteosynthesis materials and 6 with standard titanium miniplates)...
October 14, 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"