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https://www.readbyqxmd.com/read/28929419/high-resolution-mr-imaging-for-dental-impressions-a-feasibility-study
#1
Julian Boldt, Kurt Rottner, Marc Schmitter, Andreas Hopfgartner, Peter Jakob, Ernst-Jürgen Richter, Olga Tymofiyeva
OBJECTIVES: Magnetic resonance imaging is an emerging technology in dental medicine. While low-resolution MRI has especially provided means to examine the temporomandibular joint due to its anatomic inaccessibility, it was the goal of this study to assess whether high-resolution MRI is capable of delivering a dataset sufficiently precise enough to serve as digital impression of human teeth. MATERIALS AND METHODS: An informed and consenting patient in need of dental restoration with fixed partial dentures was chosen as subject...
September 19, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28929054/prosthetic-rehabilitation-of-a-geriatric-patient-with-squamous-cell-carcinoma-of-the-buccal-mucosa-a-report-of-clinical-challenges
#2
Raghavendra Adaki, Sarvesh Raikar, Kamal Shigli, Sivaranjani Gali
OBJECTIVE: This article aims to highlight the rehabilitation of a geriatric patient with an orofacial cheek defect by an extraoral silicone prosthesis. METHODOLOGY: Structured extra- and intra-oral examination of tissues coupled with a justified choice of impression materials, techniques, and prosthetic rehabilitation with a high-temperature vulcanizing silicone was done. RESULTS: The presence of compressible tissues, static appearance of the prosthesis during patient's facial movements, variability in complexion of the skin around the defect, and manipulating heat-vulcanized silicone were the challenges faced during clinical procedures...
April 2017: International Journal of Pharmaceutical Investigation
https://www.readbyqxmd.com/read/28928776/analytical-methods-for-the-measurement-of-polymerization-kinetics-and-stresses-of-dental-resin-based-composites-a-review
#3
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/28928471/nanoscale-compositional-mapping-of-cells-tissues-and-polymers-with-ringing-mode-of-atomic-force-microscopy
#4
M E Dokukin, I Sokolov
Recently developed sub-resonance tapping modes (such as Digital Pulse, Peak Force Tapping, HybriD, etc.) of atomic force microscopy (AFM) allow imaging of compositional contrast of (bio)materials and biological cells down to the nanoscale. Here we report on a powerful extension of those modes, "ringing" mode, which more than doubles the number of non-trivial physical channels that can be collected with a regular sub-resonance tapping. It can simultaneously record five new additional compositional parameters related to adhesive and viscoelastic properties of the sample surface: the restored (averaged) adhesion, adhesion height, pull-off neck height, detachment distance, and detachment energy losses...
September 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28927925/optical-properties-of-zirconia-ceramics-for-esthetic-dental-restorations-a-systematic-review
#5
REVIEW
Reza Shahmiri, Owen Christopher Standard, Judy N Hart, Charles Christopher Sorrell
STATEMENT OF PROBLEM: Yttria-stabilized tetragonal zirconia polycrystal has been used as a dental biomaterial for several decades because the fracture toughness and bend strength are increased by a stress-induced transformation-toughening mechanism. However, its esthetics are compromised by its poor translucency and grayish-white appearance. PURPOSE: The purpose of the present systematic review was to assess information on the mechanical, chemical, and optical requirements of monolithic zirconia dental restorations...
September 16, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28923549/color-stability-of-lithium-disilicate-ceramics-after-aging-and-immersion-in-common-beverages
#6
Eleni-Sotiria Palla, Eleana Kontonasaki, Nikolaos Kantiranis, Lambrini Papadopoulou, Triantafyllia Zorba, Konstantinos M Paraskevopoulos, Petros Koidis
STATEMENT OF PROBLEM: The color of an esthetic restoration and its color stability are important for long-term success. However, the impact of common beverages on lithium disilicate ceramic is not well known. PURPOSE: The purpose of this in vitro study was to investigate color variations of lithium disilicate ceramics after thermal cycling (TC) and immersion in commonly consumed beverages. MATERIAL AND METHODS: A total of 288 specimens (1×10×10 mm) were fabricated from IPS e-max computer-aided design (CAD) (n=72), IPS e-max CERAM ([CER] n=72), IPS e-max Press with glazing ([PG] n=72), and IPS e-max Press without glazing ([PNG] n=72) according to the manufacturer's instructions...
September 16, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28923548/survival-of-extensively-damaged-endodontically-treated-incisors-restored-with-different-types-of-posts-and-core-foundation-restoration-material
#7
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/28923547/how-oral-environment-simulation-affects-ceramic-failure-behavior
#8
Ediléia Lodi, Kátia R Weber, Paula Benetti, Pedro H Corazza, Álvaro Della Bona, Márcia Borba
STATEMENT OF PROBLEM: Investigating the mechanical behavior of ceramics in a clinically simulated scenario contributes to the development of new and tougher materials, improving the clinical performance of restorations. The optimal in vitro environment for testing is unclear. PURPOSE: The purpose of this in vitro study was to investigate the failure behavior of a leucite-reinforced glass-ceramic under compression loading and fatigue in different simulated oral environment conditions...
September 16, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28923546/influence-of-implant-abutment-material-and-ceramic-thickness-on-optical-properties
#9
Bundhit Jirajariyavej, Peeraphorn Wanapirom, Chuchai Anunmana
STATEMENT OF PROBLEM: Anterior shade matching is an essential factor influencing the esthetics of a ceramic restoration. Dentists face a challenge when the color of an implant abutment creates an unsatisfactory match with the ceramic restoration or neighboring teeth. PURPOSE: The purpose of this in vitro study was to evaluate the influence of abutment material and ceramic thickness on the final color of different ceramic systems. MATERIAL AND METHODS: Four experimental and control ceramic specimens in shade A3 were cut from IPS e...
September 16, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28923324/regenerating-heart-using-a-novel-compound-and-human-wharton-jelly-mesenchymal-stem-cells
#10
Shahram Rabbani, Masoud Soleimani, Mohammad Imani, Mohammad Sahebjam, Ali Ghiaseddin, Seyed Mahdi Nassiri, Jalil Majd Ardakani, Maryam Tajik Rostami, Arash Jalali, Bahmanshir Mousanassab, Mahsa Kheradmandi, Seyed Hossein Ahmadi Tafti
BACKGROUND: Myocardial infarction is a major problem in health system and most conventional therapy is not led to restoration of the health. Stem cell therapy is a method to regenerate the heart but today appropriate cell source and scaffold selection as extracellular matrix to achieve the best effect is disputing. AIM OF THE STUDY: In this study a combination of human Wharton jelly mesenchymal stem cells (HWJMSCs) with a novel compound consisting polyethylene glycol (PEG), hyaluronic acid and chitosan is presented to heart regeneration...
April 2017: Archives of Medical Research
https://www.readbyqxmd.com/read/28922799/restoring-victory-naval-heritage-identity-and-memory-in-interwar-britain
#11
Don Leggett
In the decade following 1918, HMS Victory was restored as a memorial to the nation, empire, the Navy, and all the sailors who had lost their lives in the Great War. This piece of Britain's naval heritage became a focal point for Great War memory and a resource for narrating the Navy's place in post-war Britain. This article analyses the restoration campaign, focusing on its appeal work and the materials it produced, discourses surrounding the restoration and the use of Victory's oak to recover this ship's importance at the intersection between Britain and its Navy in the aftermath of the Great War, and the function that the Navy played in the construction of post-war memory and identity...
March 1, 2017: 20 Century British History
https://www.readbyqxmd.com/read/28921710/non-stick-properties-of-thin-film-coatings-on-dental-restorative-instruments
#12
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/28917087/evaluation-of-four-different-restorative-materials-for-restoration-of-the-periodontal-condition-of-wedge-shaped-defect-a-comparative-study
#13
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/28914251/clinical-and-radiographic-comparison-of-platelet-rich-fibrin-and-mineral-trioxide-aggregate-as-pulpotomy-agents-in-primary-molars
#14
Surendra Patidar, Namita Kalra, Amit Khatri, Rishi Tyagi
AIM: This study aimed to evaluate and compare the Platelet-rich fibrin (PRF) and Mineral trioxide aggregate (MTA) as a pulpotomy agent in primary molars. MATERIAL AND METHODS: In this study, 50 primary molars from 50 healthy children aged 5-9 years requiring pulpotomy were randomly allocated into two groups. In PRF group, after coronal pulp removal and hemostasis, remaining pulp tissue was covered with PRF preparation. In the MTA group, the pulp stumps were covered with MTA (Pro Root MTA-Root Canal Repair Material, Dentsply International Inc...
October 2017: Journal of the Indian Society of Pedodontics and Preventive Dentistry
https://www.readbyqxmd.com/read/28913724/use-of-phytoproductivity-data-in-the-choice-of-native-plant-species-to-restore-a-degraded-coal-mining-site-amended-with-a-stabilized-industrial-organic-sludge
#15
Claudete G Chiochetta, Hela Toumi, Renata F S Böhm, Fernanda Engel, Gabriel Poyer-Radetski, Leonardo R Rörig, Fabrizio Adani, Claudemir M Radetski
Coal mining-related activities result in a degraded landscape and sites associated with large amounts of dumped waste material. The arid soil resulting from acid mine drainage affects terrestrial and aquatic ecosystems, and thus, site remediation programs must be implemented to mitigate this sequential deleterious processes. A low-cost alternative material to counterbalance the affected physico-chemical-microbiological aspects of the degraded soil is the amendment with low contaminated and stabilized industrial organic sludge...
September 14, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28904947/sodium-hypochlorite-irrigation-and-its-effect-on-bond-strength-to-dentin
#16
REVIEW
Tariq S Abuhaimed, Ensanya A Abou Neel
Effective shaping and cleaning of root canals are essential for the success of endodontic treatment. Due to the complex anatomy of root canal spaces, the use of various instrumentation techniques alone is not effective in producing bacteria-free root canal spaces. Irrigation, disinfectants, rinses, and intervisit medications are used in conjunction with the mechanical instrumentation to ensure the success of endodontic treatment. Sodium hypochlorite (NaOCl), a halogenated compound, is routinely used to irrigate the root canal during endodontic treatments...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28904324/management-of-developmental-enamel-defects-in-the-primary-dentition
#17
Kanae Wada, Hanae Kanazawa, Mifune Kudo, Junko Kindaichi, Michiyo Miyashin
This study attempted to identify appropriate materials for restoration of enamel defects in the primary dentition, which were classified by severity and region with the modified developmental defects of enamel index. To identify the most appropriate materials, we used restorative materials to protect teeth and evaluated clinical outcomes of restoration. Three materials were used for restoration or repair after dislodgement of restorations. Our findings in this case suggest that, because of its durability and esthetic advantages, adhesive resin is beneficial for patients with enamel defects, particularly for restorations of less than two-thirds of the extent of the defect...
2017: Journal of Oral Science
https://www.readbyqxmd.com/read/28902242/polymerization-shrinkage-stress-of-composite-resins-and-resin-cements-what-do-we-need-to-know
#18
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
#19
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/28902238/dental-ceramics-a-review-of-new-materials-and-processing-methods
#20
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
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