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https://www.readbyqxmd.com/read/28230910/adhesives-for-bonded-molar-tubes-during-fixed-brace-treatment
#1
REVIEW
Declan T Millett, Nicky A Mandall, Rye Cr Mattick, Joy Hickman, Anne-Marie Glenny
BACKGROUND: Orthodontic treatment involves using fixed or removable appliances (dental braces) to correct the positions of teeth. The success of a fixed appliance depends partly on the metal attachments (brackets and bands) being glued to the teeth so that they do not become detached during treatment. Brackets (metal squares) are usually attached to teeth other than molars, where bands (metal rings that go round each tooth) are more commonly used. Orthodontic tubes (stainless steel tubes that allow wires to pass through them), are typically welded to bands but they may also be glued directly (bonded) to molars...
February 23, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28230652/a-case-of-postmortem-canine-depredation
#2
Dennis J Chute, Robert J Bready
We report the case of postmortem animal depredation that produced initial confusion for investigators who responded to the scene. A decomposing elderly woman was found in her presumed home with bilateral upper extremity amputations and craniocerebral trauma. This raised suspicion of foul play. Subsequent investigations together with autopsy led the medical examiner to conclude that the cause of death was natural disease and that those injuries found on her body were produced by at least one of the dogs who shared the premises...
February 23, 2017: American Journal of Forensic Medicine and Pathology
https://www.readbyqxmd.com/read/28230598/analysis-of-the-adherence-of-dental-pulp-stem-cells-on-two-dimensional-and-three-dimensional-silk-fibroin-based-biomaterials-applications-in-regenerative-dentistry
#3
María Pilar Pecci-Lloret, Mar Vera-Sánchez, Salvador Aznar-Cervantes, David García-Bernal, Ricardo Oñate Sánchez, Miguel Ramón Pecci-Lloret, José María Moraleda, José Luis Cenis, Francisco Javier Rodríguez-Lozano
Among various biomaterials used as scaffolds in tissue engineering, silk fibroin is a highly attractive material. A scaffold should be biocompatible and nontoxic, with optimal physical features and mechanical properties. For this reason, tissue-engineering approaches in regenerative medicine have focused on investigating the biocompatibility of possible biomaterials by analyzing cell-scaffold interaction properties. The aim of the present study was to examine the biocompatibility of silk fibroin as a film (two-dimensional [2D]) and a scaffold (three-dimensional [3D]) after being cellularized with human dental pulp stem cells (hDPSCs)...
February 22, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28230597/histomorphometric-evaluation-of-two-different-bone-substitutes-in-sinus-floor-augmentation-procedures
#4
Marco Portelli, Marco Cicciù, Floriana Lauritano, Gabriele Cervino, Maurizio Manuelli, Enrico Felice Gherlone, Alessandra Lucchese
The aim of this study is to compare the histomorphometric data of deproteinized bovine bone (DBB) and a fully synthetic bone substitute, poly (lactic-co-glycolic) acid/hydroxyapatite (PLGA/HA) applied for sinus floor augmentation technique. Twelve maxillary atrophic ridges of 8 patients requiring major maxillary sinus floor augmentation were studied; the sites were randomly assigned to the study groups and reexamined at 6 months after grafting using cone beam computed tomography scans and biopsy samples harvested during dental implant placement...
February 22, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28229403/a-simple-protocol-to-isolate-characterize-and-expand-dental-pulp-stem-cells
#5
Federica Di Scipio, Andrea Elio Sprio, Maria Elisabetta Carere, Zhiqian Yang, Giovanni Nicolao Berta
Adult stem cells reside in body tissues to preserve organs and whole organism homeostasis. They are acquiring a prominent role in the contemporary medicine. Many protocols to isolate and cultivate adult stem cells have been so far described, though they are often lengthy, laborious, and require very expansive instruments, materials, and reagents. On this basis, we describe a simple, cheap but at the same time functional method to: (1) isolate dental pulp stem cells (DPSC), (2) expand and cultivate DPSC, (3) cryopreserve DPSC, (4) characterize DPSC, and (5) differentiate DPSC into both mesenchymal and non-mesenchymal lineages...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28228165/determining-optimal-fluorescent-agent-concentrations-in-dental-adhesive-resins-for-imaging-the-tooth-restoration-interface
#6
Odair Bim Júnior, Marco A Cebim, Maria T Atta, Camila M Machado, Luciana F Francisconi-Dos-Rios, Linda Wang
Fluorescent dyes like Rhodamine B (RB) have been used to identify the spatial distribution of adhesive restorative materials in the tooth/restoration interface. Potential effects of the addition of RB to dental adhesives were addressed in the past, but no further information is available on how to determine suitable concentrations of RB in these bonding agents for imaging in the confocal laser scanning microscope. This study provides systematical strategies for adding RB to viscous dental adhesive resins, focusing on the determination of the lowest range of dye concentrations necessary to achieve an acceptable image of the dentin/adhesive interface...
February 2017: Microscopy and Microanalysis
https://www.readbyqxmd.com/read/28223199/poly-methyl-methacrylate-with-tio2-nanoparticles-inclusion-for-stereolitographic-complete-denture-manufacturing-the-fututre-in-dental-care-for-elderly-edentulous-patients
#7
Eugenia Eftimie Totu, Aurelia Cristina Nechifor, Gheorghe Nechifor, Hassan Y Aboul-Enein, Corina Marilena Cristache
OBJECTIVES: The aim of this study was to obtain a Poly(methylmethacrylate) (PMMA)-TiO2 nanocomposite material with improved antibacterial characteristics, suitable for manufacturing 3D printed dental prosthesis. METHODS: 0.2, 0.4, 0.6, 1, 2.5 by weight% of TiO2 nanoparticles have been added to the commercially available stereolithographic PMMA material and the obtained nanocomposites have been analyzed using FTIR, SEM and also tested for antimicrobial efficacy against bacterial cultures from Candida species (C...
February 18, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28222907/fatigue-testing-of-biomaterials-and-their-interfaces
#8
Dwayne Arola
OBJECTIVE: The objective of this article is to describe the importance of fatigue to the success of restorative dentistry, with emphasis on the methods for evaluating the fatigue properties of materials in this field, and the durability of their bonded interfaces. METHODS: The stress-life fatigue and fatigue crack growth approaches for evaluating the fatigue resistance of dental biomaterials are introduced. Emphasis is placed on in vitro studies of the hard tissue foundation, restorative materials and their bonded interfaces...
February 17, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28222886/effect-of-different-acidic-solutions-on-the-optical-behavior-of-lithium-disilicate-ceramics
#9
Daniela Micheline Dos Santos, Emily Vivianne Freitas da Silva, Aljomar José Vechiato-Filho, Denis Watanabe, Sandro Basso Bitencourt, Aimée Maria Guiotti, Marcelo Coelho Goiato
STATEMENT OF PROBLEM: The stability of the optical characteristics of dental ceramics is essential. Degradation of these materials resulting from pH or temperature alterations in the oral cavity can lead to treatment failure. PURPOSE: The purpose of this in vitro study was to evaluate the color change (ΔE), the L* coordinate, the translucency parameter, and the contrast ratio of lithium disilicate ceramic exposed to commonly used and potentially colorant solutions...
February 17, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28222871/evaluation-of-hypersensitivity-after-the-placement-of-metal-ceramic-crowns-cemented-with-two-luting-agents-long-term-results-of-a-prospective-clinical-study
#10
Carla Kozmacs, Katharina Schaper, Hans-Christoph Lauer, Andree Piwowarczyk
STATEMENT OF PROBLEM: Different luting materials are available for the cementation of fixed dental prostheses. Postcementation hypersensitivity is an occasional complication in the definitive delivery. How the choice of luting agent affects long-term postcementation sensitivity is unknown. PURPOSE: The purpose of this prospective, randomized, controlled, split-mouth clinical trial was to compare the hypersensitivity of 2 cementation methods for metal ceramic crowns...
February 17, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28218482/osteoblastic-differentiation-of-periodontal-ligament-stem-cells-on-non-stoichiometric-calcium-phosphate-and-titanium-surfaces
#11
L Winning, L Robinson, A R Boyd, I A El Karim, F T Lundy, B J Meenan
Bioactive materials offer particular clinical benefits in the field of dental implantology, where differentiation of stem cells towards an osteoblastic lineage is required for osseointegration and appropriate function of implants in vivo. The aim of this study was to evaluate the osteoblastic response of Stro-1+ve periodontal ligament stem cells (PDLSCs) to three well-characterised biomaterial surfaces: an abraded titanium surface (cpTi) control; a polycrystalline titanium surface, with both micro and nano-topography produced by radio frequency magnetron sputtering (TiTi); and the same surface incorporating a sputter deposited calcium phosphate coating (CaP-TiTi)...
February 20, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28217840/a-comparison-of-us-and-japanese-dental-restorative-care-present-on-service-members-recovered-from-the-wwii-era
#12
Calvin Y Shiroma
The documentation of dental materials used in the USA during the WWII era is readily available, while references for the Japanese are minimal. It was therefore important to build a photographic database of Japanese restorative care which could be utilized as a comparison tool for the deployed odontologist. The dental restorative care of approximately 400 US and 100 Japanese sets of remains was evaluated. Both countries share many similar restorative techniques to include collared crowns, full-coverage restorations, cantilever bridge/pontics to close spaces; restorative materials such as amalgam, gold, and zinc phosphate (temporary) restorations; and removable prostheses...
February 20, 2017: Journal of Forensic Sciences
https://www.readbyqxmd.com/read/28216850/versatility-of-peek-as-a-fixed-partial-denture-framework
#13
Nikita Sinha, Nidhi Gupta, K Mahendranadh Reddy, Y M Shastry
Materials used for fixed partial denture (FPD) frameworks have had properties of excellent strength, durability, and biocompatibility. Some of the materials which have been used till date include alloys, ceramics, and high-performance polymers such as zirconia, Ni-Cr, lithium disilicate, and so on. All these, though excellent, have their advantages and disadvantages. Hence, the search has always been on for a better material. One such material, which has made its foray into dentistry in the recent times, is polyetheretherketone (PEEK)...
January 2017: Journal of Indian Prosthodontic Society
https://www.readbyqxmd.com/read/28216844/effect-of-technique-and-impression-material-on-the-vertical-misfit-of-a-screw-retained-three-unit-implant-bridge-an-in-vitro-study
#14
Hamidreza Rajati Haghi, Masoud Shiehzadeh, Mohammadreza Nakhaei, Fatemeh Ahrary, Saeid Sabzevari
INTRODUCTION: A dental impression is a negative imprint of an oral structure that can be used to produce a positive cast of a patient's teeth as a permanent record. The accuracy of the impression affects the accuracy of the cast, and a precise impression is needed in order to create prosthesis with optimal fitting. Minimization of misfit is an important aim in prosthesis science and dental implants. The aim of this study was to evaluate the effects of the materials and techniques used to take an impression on the vertical misfit of implant-supported, screw-retained, three-unit bridges...
January 2017: Journal of Indian Prosthodontic Society
https://www.readbyqxmd.com/read/28216843/in-vitro-evaluation-of-cytotoxicity-and-corrosion-behavior-of-commercially-pure-titanium-and-ti-6al-4v-alloy-for-dental-implants
#15
Sanchitha Chandar, Ravindra Kotian, Prashanthi Madhyastha, Shama Prasada Kabekkodu, Padmalatha Rao
PURPOSE: The aim of this study was to investigate the cytotoxicity in human gingival fibroblast by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay and corrosion behavior by potentiodynamic polarization technique of commercially pure titanium (Ti 12) and its alloy Ti-6Al-4V (Ti 31). MATERIALS AND METHODS: In the present in vitro study, cytotoxicity of Ti 12 and Ti 31 in human gingival fibroblast by MTT assay and the corrosion behavior by potentiodynamic polarization technique in aqueous solutions of 0...
January 2017: Journal of Indian Prosthodontic Society
https://www.readbyqxmd.com/read/28216825/surgical-excision-and-contoured-custom-made-splint-to-treat-helical-keloid
#16
Ankita Chamaria, Reuben Fernando De Sousa, Meena Ajay Aras, Kennedy Mascarenhas
Helical keloids are difficult to treat as surgical excision requires effective compression of the operative scar to prevent recurrence while retaining the contour and elasticity of the helix. The authors fabricated a conforming custom made post-operative splint from a commonly used dental material. Splints could be fabricated in both pre-operative and post-operative stage.
September 2016: Indian Journal of Plastic Surgery: Official Publication of the Association of Plastic Surgeons of India
https://www.readbyqxmd.com/read/28215957/an-approach-to-understanding-tribological-behaviour-of-dental-composites-through-volumetric-wear-loss-and-wear-mechanism-determination-beyond-material-ranking
#17
Asmaa Altaie, Nigel L Bubb, Paul Franklin, Adam H Dowling, Garry J P Fleming, David J Wood
OBJECTIVE: To investigate the fundamental wear mechanisms of six resin-based composite (RBC) formulations during short-term in-vitro wear testing. MATERIALS: RBC materials were condensed into rectangular bar-shaped specimens and light irradiated using the ISO 4049 specimen manufacture and irradiation protocol. Wear testing (n=10 specimens for each RBC) was performed on a modified pin-on-plate wear test apparatus and wear facets were analysed for wear volume loss using a white light profilometer...
February 16, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28215503/biomaterial-shell-bending-with-3d-printed-templates-in-vertical-and-alveolar-ridge-augmentation-a-technical-note
#18
Florian G Draenert, Florian Gebhart, Gergo Mitov, Andreas Neff
OBJECTIVES: Alveolar ridge and vertical augmentations are challenging procedures in dental implantology. Even material blocks with an interconnecting porous system are never completely resorbed. Shell techniques combined with autologous bone chips are therefore the gold standard. Using biopolymers for these techniques is well documented. We applied three-dimensional (3-D) techniques to create an individualized bending model for the adjustment of a plane biopolymer membrane made of polylactide...
January 4, 2017: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
https://www.readbyqxmd.com/read/28212980/biofilm-formation-and-release-of-fluoride-from-dental-restorative-materials-in-relation-to-their-surface-properties
#19
Sebastian Hahnel, Andrei C Ionescu, Gloria Cazzaniga, Marco Ottobelli, Eugenio Brambilla
OBJECTIVES: To elucidate the impact of surface properties and the release of fluoride from different glass ionomer cements on biofilm formation. METHODS: Standardized specimens manufactured from various classes of glass ionomer cements (GICs), a resin-based composite (RBC), and human enamel were subjected to surface analyses. Subsequent to simulation of salivary pellicle formation, Streptococcus mutans biofilm formation was initiated using a drip flow reactor for 48h and 96h...
February 14, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28212979/degradation-of-optical-and-surface-properties-of-resin-based-composites-with-distinct-nanoparticle-sizes-but-equivalent-surface-area
#20
Vinícius Esteves Salgado, Larissa Maria Cavalcante, Rafael R Moraes, Harry B Davis, Jack L Ferracane, Luis Felipe Schneider
OBJECTIVE: To determine the optical and surface properties of model resin-based composites made with distinct nanoparticle sizes but equalized surface area, among them, before and after ageing. METHODS: Model resin-based composites based on BisGMA/TEGDMA (50:50mol%) were loaded with three different fumed silica filler content (7nm/examethyldisilazane, 12nm/octylsilane, and 16nm/dimethylchlorosilane), but with equivalent surface area (BET method). The optical and surface properties of the disk-shaped specimens were measured in 24h after photoactivation (baseline) and repeated after water storage (90days at 37°C), and after abrasion (20,000 cycles of brushing)...
February 14, 2017: Journal of Dentistry
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