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https://www.readbyqxmd.com/read/29150134/stress-generation-in-mandibular-anterior-teeth-restored-with-different-types-of-post-and-core-at-various-levels-of-ferrule
#1
Anatolii Savychuk, Marianthi Manda, Christos Galanis, Christofer Provatidis, Petros Koidis
STATEMENT OF PROBLEM: Pertinent evidence regarding the mechanical integrity of mandibular anterior teeth restored with a post-and-core is limited. PURPOSE: The purpose of this finite element analysis study was to compare the impact of the post type (glass fiber post-and-resin core or cast post-and-core) along with the ferrule effect on the stress fields generated in endodontically treated mandibular lateral incisors and canines. MATERIAL AND METHODS: Three-dimensional models of the segmented mandible were developed...
November 15, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29148913/using-cross-polarized-photography-as-a-guide-for-selecting-resin-composite-shade
#2
C A Villavicencio-Espinoza, M H Narimatsu, A Y Furuse
The restoration of single discolored maxillary anterior teeth is still a difficult task, as not only shape and surface characterization play an important role in the success of the treatment, but the propagation of light throughout the restorative material does as well. In some cases, small changes in morphology, color, and brightness will be noticeable. These factors are sometimes very tricky, and shade guides alone are difficult to use for color selection. This article proposes a protocol of employing cross-polarization imaging for improving the accuracy of the shade selection of resin composites...
November 17, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/29147098/purification-and-anti-pathogenic-properties-of-immunoglobulin-concentrates-from-porcine-blood
#3
Tae-Hwan Jung, Jae-Hwan Choi, Kyung-Chul Koh, Woo-Min Jeon, Kyoung-Sik Han
During slaughtering, animal blood is typically discarded, resulting in water pollution. However, this discarded blood has valuable components, such as immunoglobulin (Ig). Although several studies have been conducted to develop methods for effective recycling of slaughterhouse blood, they have not been commercially utilized in Korea. Here, we extracted an Ig-rich fraction from porcine blood that was then subjected to various in vitro tests, including pathogen growth inhibition, antigenic cross-reactivity, and anti-toxin activity...
2017: Korean Journal for Food Science of Animal Resources
https://www.readbyqxmd.com/read/29146151/a-new-two-component-compression-system-turning-an-elastic-bandage-into-an-inelastic-compression-device-interface-pressure-stiffness-and-haemodynamic-effectiveness
#4
Giovanni Mosti, Hugo Partsch
INTRODUCTION: Bandage application does not exert consistent compression pressure, leading to extremely variable compression when applied to patients. A new elastic bandage can exert a predefined pressure independently of healthcare providers and the size of the wrapped limb. The bandage system includes a series of non-stretchable patches that when applied to the bandage make it stiff. The aim of this work was to assess, in an experimental setting, the venous ejection fraction (EF) from the lower leg and the tolerability of this new bandage in a group of patients affected by superficial venous incompetence...
November 13, 2017: European Journal of Vascular and Endovascular Surgery
https://www.readbyqxmd.com/read/29145898/making-gametes-from-alternate-sources-of-stem-cells-past-present-and-future
#5
REVIEW
Deepa Bhartiya, Sandhya Anand, Hiren Patel, Seema Parte
Infertile couples including cancer survivors stand to benefit from gametes differentiated from embryonic or induced pluripotent stem (ES/iPS) cells. It remains challenging to convert human ES/iPS cells into primordial germ-like cells (PGCLCs) en route to obtaining gametes. Considerable success was achieved in 2016 to obtain fertile offspring starting with mouse ES/iPS cells, however the specification of human ES/iPS cells into PGCLCs in vitro is still not achieved. Human ES cells will not yield patient-specific gametes unless and until hES cells are derived by somatic cell nuclear transfer (therapeutic cloning) whereas iPS cells retain the residual epigenetic memory of the somatic cells from which they are derived and also harbor genomic and mitochondrial DNA mutations...
November 16, 2017: Reproductive Biology and Endocrinology: RB&E
https://www.readbyqxmd.com/read/29145010/the-use-of-hardened-bone-cement-as-an-impaction-grafting-extender-for-revision-hip-arthroplasty
#6
Mark Ruddy, David P FitzPatrick, Kenneth T Stanton
Impaction bone grafting is a method of restoring bone stock to patients who have suffered significant bone loss due to revision total hip surgery. The procedure requires morsellised cancellous bone (MCB) to be impacted into the site of bone loss in order to stabilise the prosthesis with the aim of long term resorption and reintegration of the impacted bone graft. Due to financial cost and the potential to transmit disease, the use of supplementary material, known as an extender, is frequently used to increase the graft material volume...
November 13, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29144874/evaluation-of-interfacial-gap-volume-of-two-low-shrinkage-composites-using-micro-computed-tomography
#7
Hna Al Nahedh, N S Sibai
OBJECTIVES: To investigate the efficacy of X-ray micro-computed tomography (μCT) in the detection and quantification of interfacial gap formation in standardized Class I and Class II resin composite restorations, to compare the interfacial gaps for two low-shrinkage resin composites with a methacrylate composite material, and to determine any correlation between the cavity configuration factor (C-factor) and the volume of gaps formed. METHODS AND MATERIALS: Sixty standardized Class I and Class II cavities were prepared and divided into six groups...
November 2017: Operative Dentistry
https://www.readbyqxmd.com/read/29143388/in-vitro-assessment-of-retention-and-resistance-failure-loads-of-teeth-restored-with-a-complete-coverage-restoration-and-different-core-materials
#8
Vasileia Tsiagali, Yvoni Kirmanidou, Argirios Pissiotis, Konstantinos Michalakis
PURPOSE: To investigate in vitro the retention and the resistance form, as well as the failure modes of maxillary premolars restored with cast metal crowns and different core materials. MATERIALS AND METHODS: Sixty human extracted maxillary premolars were selected according to their size and were embedded in PMMA resin blocks. After removing a part of their clinical crowns, the teeth were randomly divided into 3 groups of 20 teeth and were either left unrestored, or they were restored with amalgam or composite resin...
November 16, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29143348/runx-2-opn-and-ocn-expression-induced-by-grey-and-white-mineral-trioxide-aggregate-in-normal-and-hypertensive-rats
#9
C M Martins, I O A Queiroz, E Ervolino, L T A Cintra, J E Gomes-Filho
AIM: To investigate whether hypertension affects white and grey mineral trioxide aggregate (MTA Angelus (®) ) mineralization implanted subcutaneously into rats by assaying osteoblastic biomarkers. METHODOLOGY: Polyethylene tubes containing grey MTA Angelus (®) , white MTA Angelus (®) , intermediate restorative material (IRM; positive control), or an empty tube (negative control) were implanted into the dorsal connective tissue of spontaneous hypertensive (n = 12) and Wistar (normotensive; n = 10) rats...
November 16, 2017: International Endodontic Journal
https://www.readbyqxmd.com/read/29142873/microhybrid-versus-nanofill-composite-in-combination-with-a-three-step-etch-and-rinse-adhesive-in-occlusal-cavities-five-year-results
#10
Safa Tuncer, Mustafa Demirci, Evren Öztaş, Neslihan Tekçe, Ömer Uysal
Objectives: The aim of the study was to evaluate the 5-year clinical performance of occlusal carious restorations using nanofill and microhybrid composites, in combination with 3-step etch-and-rinse adhesives, in patients who were going to commence orthodontic treatment. Materials and Methods: A total of 118 restorations for occlusal caries were conducted prior to orthodontic treatment. Occlusal restorations were performed both with Filtek Supreme XT (3M ESPE) and Filtek Z250 (3M ESPE) before beginning orthodontic treatment with fixed orthodontic bands...
November 2017: Restorative Dentistry & Endodontics
https://www.readbyqxmd.com/read/29142647/effects-of-staining-liquids-and-finishing-methods-on-translucency-of-a-hybrid-ceramic-material-having-two-different-translucency-levels
#11
Sebnem Ulviye Buyukkaplan, Mehmet Mustafa Özarslan, Çağatay Barutcigil, Merve Arslan, Kubilay Barutcigil, Elif Ece Yoldan
PURPOSE: Beverages may affect the translucency of esthetic dental restorative materials. The aim of the present study was to investigate the effects of coffee and red wine on the translucency of a PICN material with two translucency levels, and finished with different methods. MATERIALS AND METHODS: 2M2 high translucent and translucent VITA Enamic hybrid ceramic blocks were investigated. Rectangular specimens with the dimensions of 12 mm × 14 mm × 2 mm were prepared...
October 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/29142640/evaluation-of-c-albicans-and-s-mutans-adherence-on-different-provisional-crown-materials
#12
Gulsum Sayin Ozel, Mehmet Burak Guneser, Ozgur Inan, Ayce Unverdi Eldeniz
PURPOSE: Bacterial adhesion on provisional crown materials retained for a long time can influence the duration for which permanent prosthetic restorations can be healthily worn in the oral cavity. The aim of this study was to compare seven different commonly used provisional crown materials with regard to Streptococcus mutans and Candida albicans surface adhesion. MATERIALS AND METHODS: For each group, twenty specimens of the provisional fixed prosthodontic materials TemDent (Schütz), Imıdent (Imıcryl), Tab 2000 (Kerr), Structur Premium (Voco), Systemp (Ivoclar Vivadent), Acrytemp (Zhermack), and Takilon-BBF (Takilon) were prepared (diameter, 10...
October 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/29140971/effect-of-s-mutans-and-s-sanguinis-on-growth-and-adhesion-of-p-gingivalis-and-their-ability-to-adhere-to-different-dental-materials
#13
Yan Tu, Xiaolong Ling, Yadong Chen, Yuan Wang, Na Zhou, Hui Chen
BACKGROUND Caries and periodontal diseases are caused by the biofilm formed by caries- and periodontal disease-related bacteria. Specific biofilms could be formed on different filling materials in oral cavity. Thus, to explore the inhibition effect of restorative filling materials on biofilm formation is of great significance in the treatment of caries and periodontal disease. MATERIAL AND METHODS The supernatants of S. mutans, S. sanguinis, and P. gingivalis suspension were combined with BHI broth. After 24 h, the live P...
November 15, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/29134994/gas-adsorption-efficacy-of-graphene-sheets-functionalised-with-carboxyl-hydroxyl-and-epoxy-groups-in-conjunction-with-stone-thrower-wales-stw-and-inverse-stone-thrower-wales-istw-defects
#14
Murugan Lalitha, Senthilkumar Lakshmipathi
The complete reduction of graphene oxide is difficult to achieve, and hence oxygen-containing functional groups do exist in graphene, along with structural defects. On the other hand, efficient gas sensor materials have been a subject of relentless interest. This instigates the need to explore the gas adsorption on STW and ISTW defective graphene sheets functionalised by -COOH, -OH and C-O-C groups, using density functional theory calculations. Both defects are experimentally feasible as evident through their formation energies...
November 14, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29133408/ecosystem-management-and-land-conservation-can-substantially-contribute-to-california-s-climate-mitigation-goals
#15
D Richard Cameron, David C Marvin, Jonathan M Remucal, Michelle C Passero
Modeling efforts focused on future greenhouse gas (GHG) emissions from energy and other sectors in California have shown varying capacities to meet the emissions reduction targets established by the state. These efforts have not included potential reductions from changes in ecosystem management, restoration, and conservation. We examine the scale of contributions from selected activities in natural and agricultural lands and assess the degree to which these actions could help the state achieve its 2030 and 2050 climate mitigation goals under alternative implementation scenarios...
November 13, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29130615/in-office-bleaching-efficacy-on-stain-removal-from-cad-cam-and-direct-resin-composite-materials
#16
Amal Alharbi, Stefano Ardu, Tissiana Bortolotto, Ivo Krejci
OBJECTIVE: To evaluate the efficacy of in-office bleaching on stain removal from stained resin composite and ceramic computer-assisted design/computer-assisted manufacturing (CAD/CAM) blocks and direct resin composites. METHODS: Forty disk-shaped samples were fabricated from each of nine materials: six CAD/CAM (VITABLOCS Mark II, Paradigm MZ100, Exp Vita Hybrid Ceramic, VITA ENAMIC, Exp Kerr, and LAVA Ultimate) and three direct resin composites (Filtek Supreme, Venus Diamond, and Filtek Silorane)...
November 11, 2017: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/29128767/biochar-alleviates-phytotoxicity-in-ficus-elastica-grown-in-zn-contaminated-soil
#17
Abhay Kumar, Ludmila Tsechansky, Beni Lew, Eran Raveh, Omer Frenkel, Ellen R Graber
Zinc (Zn) immobilization by two distinct biochars in soil, together with concomitant alleviation of phytotoxic responses in Ficus elastica Roxb. ex Hornem., were examined. Rooted cuttings of F. elastica were grown in 880mgkg(-1) Zn-spiked sandy soil amended with grain husk (GH) or cattle manure (CM) biochar at 0, 10, 30 and 50gkg(-1) soil for a period of 6months. Addition of both GH and CM biochars had significant positive impacts on physiological parameters such as plant growth, leaf relative water content, photosynthetic pigments and leaf gas exchange characteristics...
November 9, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29128128/cad-fe-modeling-and-analysis-of-class-ii-restorations-incorporating-resin-composite-glass-ionomer-and-glass-ceramic-materials
#18
Pietro Ausiello, Stefano Ciaramella, Massimo Martorelli, Antonio Lanzotti, Antonio Gloria, David C Watts
OBJECTIVES: To investigate the influence of specific resin-composite, glass ceramic and glass ionomer cement (GIC) material combinations in a "multi-layer" technique to replace enamel and dentin in class II mesio-occlusal-distal (MOD) dental restorations using 3D-Finite Element Analysis (FEA). METHODS: Four 3D-FE models (A-D) of teeth, adhesively restored with different filling materials, were created and analyzed in comparison with a 3D model (E) of a sound lower molar...
November 8, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29126692/biomaterials-in-temporomandibular-joint-replacement-current-status-and-future-perspectives-a-narrative-review
#19
REVIEW
N De Meurechy, A Braem, M Y Mommaerts
The alloplastic total temporomandibular joint (TMJ) prosthesis has a long history, with many different materials and designs used. While several of these materials have proven valuable over time, many others have not been suitable for implantation, resulting in failure and the need for explantation of the implant. Because of the failure of several of these systems, the use of alloplastic prostheses has reduced dramatically, despite their advantages over autogenous restoration. The aim of this narrative review is to discuss the criteria that must be met by a biomaterial in order for it to be considered suitable for implantation, as well as the common complications that can occur...
November 7, 2017: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29126633/mechanical-behavior-of-endodontically-restored-canine-teeth-effects-of-ferrule-post-material-and-shape
#20
Pietro Ausiello, Stefano Ciaramella, Massimo Martorelli, Antonio Lanzotti, Fernando Zarone, David C Watts, Antonio Gloria
OBJECTIVE: To assess the effect of a ferrule design with specific post material-shape combinations on the mechanical behavior of post-restored canine teeth. METHODS: Micro-CT scan images of an intact canine were used to create a 3-D tessellated CAD model, from which the shapes of dentin, pulp and enamel were obtained and geometric models of post-endodontically restored teeth were created. Two types of 15mm post were evaluated: a quartz fiber post with conical-tapered shape, and a carbon (C) fiber post with conical-cylindrical shape...
November 7, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
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