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https://www.readbyqxmd.com/read/29684777/random-spectrum-fatigue-performance-of-severely-plastically-deformed-titanium-for-implant-dentistry-applications
#1
D Rittel, K Shemtov-Yona, R Lapovok
Severe plastic deformation (SPD) has long been known to confer superior mechanical properties for many metals and alloys. In the general field of biomedical devices, and dental implants in particular, the superior strength of SPD-processed commercially pure (CP) titanium, that may surpass that of the stronger Ti6Al4V alloy, has been associated with a superior fatigue resistance. Such a property would make those materials both biocompatible and strong alternatives to the currently used titanium alloy. However, the fatigue characterization reported so far in the literature relies on a very small sample size, thereby precluding any meaningful statistical analysis...
April 14, 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29682823/additive-manufacturing-technologies-used-for-processing-polymers-current-status-and-potential-application-in-prosthetic-dentistry
#2
REVIEW
Marta Revilla-León, Mutlu Özcan
There are 7 categories of additive manufacturing (AM) technologies, and a wide variety of materials can be used to build a CAD 3D object. The present article reviews the main AM processes for polymers for dental applications: stereolithography (SLA), digital light processing (DLP), material jetting (MJ), and material extrusion (ME). The manufacturing process, accuracy, and precision of these methods will be reviewed, as well as their prosthodontic applications.
April 22, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29682092/fem-and-von-mises-analysis-of-osstem-%C3%A2-dental-implant-structural-components-evaluation-of-different-direction-dynamic-loads
#3
Gabriele Cervino, Umberto Romeo, Floriana Lauritano, Ennio Bramanti, Luca Fiorillo, Cesare D'Amico, Dario Milone, Luigi Laino, Francesco Campolongo, Silvia Rapisarda, Marco Cicciù
Purpose: The objective of this investigation is to study prosthodontics and internal components resistance to the masticatory stress and considering different force directions by using Finite Element Method analysis (FEM). The structural materials of the components are usually Titanium alloy grade 4 or 5 and thus, guarantee the integration of the fixture in the bone due to the osteointegration phenomena. Even if the long-term dental implant survival rate is easy to be obtained and confirmed by numerous researches, the related clinical success, due to the alteration of the mechanical and prosthodontics components is still controversial...
2018: Open Dentistry Journal
https://www.readbyqxmd.com/read/29681480/outcome-of-endodontic-surgery-a-meta-analysis-of-the-literature-part-3-comparison-of-endodontic-microsurgical-techniques-with-2-different-root-end-filling-materials
#4
REVIEW
Meetu R Kohli, Homayon Berenji, Frank C Setzer, Su-Min Lee, Bekir Karabucak
INTRODUCTION: The aim of the present study was to investigate the influence of root-end preparation and filling material on endodontic surgery outcome. A systematic review and meta-analysis was conducted to determine the outcome of resin-based endodontic surgery (RES, the use of high-magnification preparation of a shallow and concave root-end cavity and bonded resin-based root-end filling material) versus endodontic microsurgery (EMS, the use of high-magnification ultrasonic root-end preparation and root-end filling with SuperEBA [Keystone Industries, Gibbstown, NJ], IRM [Dentsply Sirona, York, PA], mineral trioxide aggregate [MTA], or other calcium silicate cements)...
April 19, 2018: Journal of Endodontics
https://www.readbyqxmd.com/read/29680723/mineral-trioxide-aggregate-with-mussel-inspired-surface-nanolayers-for-stimulating-odontogenic-differentiation-of-dental-pulp-cells
#5
Ming-Gene Tu, Chia-Che Ho, Tuan-Ti Hsu, Tsui-Hsien Huang, Min-Jhen Lin, Ming-You Shie
INTRODUCTION: This research was intended to evaluate the feasibility of mineral trioxide aggregate (MTA) powder coated with polydopamine (PDA) in dental and bone tissue regeneration by investigating the hydration, physicochemical properties, and biological performance of hydrated cements. METHODS: The MTA powder was well suspended in a dopamine solution buffered at a pH of 8.5 using tris(hydroxymethyl)aminomethane buffer and vigorously stirred for 12 hours at room temperature...
April 18, 2018: Journal of Endodontics
https://www.readbyqxmd.com/read/29679700/toxicity-of-porcelain-fused-to-metal-substrate-to-zebrafish-danio-rerio-embryos-and-larvae
#6
Libo Zhao, Jing Si, Yuan Wei, Sirui Li, Yanjiao Jiang, Rong Zhou, Bin Liu, Hong Zhang
AIMS: Porcelain-fused-to-metal (PFM) crowns are a standard restoration technique in dentistry, but toxicity of PFM in vivo has not been systematically evaluated. The present study evaluated the effects of various metal alloy shells of PFM crowns on the development of zebrafish embryos and larvae in order to determine the safety of these materials. MAIN METHODS: Gold palladium (Au-Pd), silver palladium (Ag-Pd), Nickel chromium (Ni-Cr), cobalt chromium (Co-Cr), titanium (Ti) alloy porcelain crowns were immersed in artificial saliva for 1, 4, and 7 weeks, and the leach solution was collected and used to treat zebrafish embryos at 4-144 h PFM...
April 18, 2018: Life Sciences
https://www.readbyqxmd.com/read/29678585/fracture-load-of-metal-ceramic-monolithic-and-bi-layered-zirconia-based-posterior-fixed-dental-prostheses-after-thermo-mechanical-cycling
#7
Carlos López-Suárez, Raquel Castillo-Oyagüe, Verónica Rodríguez-Alonso, Christopher D Lynch, María-Jesús Suárez-García
OBJECTIVES: This study aims to evaluate the fracture load of differently fabricated 3-unit posterior fixed dental prostheses (FDPs) with an intermediate pontic. METHODS: Fifty sets of two stainless-steel abutments were randomly assigned to five groups (n = 10 each) depending on the material and technique used for manufacturing the FDPs: (1) Metal-ceramic (MC, control); (2) Lava Zirconia (LZ, bi-layered); (3) Lava Plus (LM, monolithic); (4) VITA In-Ceram YZ (YZ, bi-layered); and (5) IPS e-max ZirCAD (ZZ, bi-layered)...
April 17, 2018: Journal of Dentistry
https://www.readbyqxmd.com/read/29678328/chairside-cad-cam-materials-part-3-cyclic-fatigue-parameters-and-lifetime-predictions
#8
Michael Wendler, Renan Belli, Diana Valladares, Anselm Petschelt, Ulrich Lohbauer
OBJECTIVES: Chemical and mechanical degradation play a key role on the lifetime of dental restorative materials. Therefore, prediction of their long-term performance in the oral environment should base on fatigue, rather than inert strength data, as commonly observed in the dental material's field. The objective of the present study was to provide mechanistic fatigue parameters of current dental CAD/CAM materials under cyclic biaxial flexure and assess their suitability in predicting clinical fracture behaviors...
April 17, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29678327/antibacterial-quaternary-ammonium-compounds-in-dental-materials-a-systematic-review
#9
REVIEW
Pooyan Makvandi, Rezvan Jamaledin, Mostafa Jabbari, Nasser Nikfarjam, Assunta Borzacchiello
OBJECTIVE: Quaternary ammonium compounds (QACs) represent one of the most effective classes of disinfectant agents in dental materials and resin nanocomposites. This reviews aims to give a wide overview on the research in the field of antibacterial QACs in dental materials and nanocomposites. METHOD: An introduction to dental materials components as well as the microorganisms and methods of evaluation for the antimicrobial assays are presented. Then, the properties and synthesis route of QACs, as monomer and filler, are shown...
April 17, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29677796/preparation-and-characterization-of-novel-dental-material-with-high-shear-bond-strength
#10
Duck Hyun Kim, Min Jae Lee, A-Young Sung
HPMA (hydroxypropyl methacrylate) and Bis-GMA (bisphenol A glycerolate dimethacrylate), the main ingredients, and styrene, TEGDMA (triethylene glycol dimethacrylate), BPO (benzoyl peroxide) and camphoroquinone, the photo-initiators, and BHT (butylated hydroxytoluene), the photocatalyst were mixed by different ratios and stirred to investigate the compatibility of dental materials with photoinitiators. The degree of polymerization was checked and determination of the most ideal ratio for photopolymerization was followed by establishing the basic combination of styrene, HPMA, Bis-GMA, BHT, TEGDMA and HEMA...
September 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29677753/photopolymerization-and-characterization-of-dental-resin-cement-containing-nano-material
#11
Duck Hyun Kim, A-Young Sung
In this study, to manufacture dental resin cement, Bis-GMA was used as a major ingredient, TEGDMA was used as a diluent, and camphoroquinone was used as a photoinitiator. Nanodiamonds were added to increase the bonding strength. After mixing Bis-GMA, HPMA, TEGDMA, BHT, BPO, and camphoroquinone (photoinitiator), nanodiamonds were added at a ratio of 2-3%, and polymerization was done after stirring for 24 hours. Photopolymerization was also carried out with Dentmate (LWDEX WL-090) by irradiation at a 440-480 nm wavelength and at about 1000 mW/cm2 intensity for about 40 seconds...
September 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29673741/cross-sectional-observational-study-exploring-clinical-risk-of-titanium-allergy-caused-by-dental-implants
#12
Maki Hosoki, Keisuke Nishigawa, Toyoko Tajima, Mayu Ueda, Yoshizo Matsuka
PURPOSE: Studies have reported cases of metal allergy caused by titanium-containing materials. We wished to clarify the relationship between titanium allergy and dental implants by describing patients who suffered allergic symptoms after they had received such implants. METHODS: A total of 270 patients who visited a Dental Metal Allergy Clinic at Tokushima University Hospital from April 2010 to March 2014 were the study cohort. Patch testing with 28 types of metal allergens (including four titanium allergens) was undertaken for patients...
April 16, 2018: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/29670730/dental-caries-in-the-peruvian-police-population
#13
Luz A Moreno-Quispe, Luis A Espinoza-Espinoza, Loel S Bedon-Pajuelo, Magna Guzmán-Avalos
Background: Dental caries is a multifactorial disease that affects the general population. After reviewing the scientific literature, no studies were found on the index of decayed, missing and filled teeth (DMFT) in the Peruvian police population. The objective was to evaluate the DMFT index and severity level of the disease in police personnel of the Ancash region, Peru. Material and Methods: Cross-sectional prevalence study. The medical records of the police personnel in activity were reviewed and each subject was examined from May 2012 to May 2013...
February 2018: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/29670655/odontoblast-like-cells-differentiated-from-dental-pulp-stem-cells-retain-their-phenotype-after-subcultivation
#14
Paula A Baldión, Myriam L Velandia-Romero, Jaime E Castellanos
Odontoblasts, the main cell type in teeth pulp tissue, are not cultivable and they are responsible for the first line of response after dental restauration. Studies on dental materials cytotoxicity and odontoblast cells physiology require large quantity of homogenous cells retaining most of the phenotype characteristics. Odontoblast-like cells (OLC) were differentiated from human dental pulp stem cells using differentiation medium (containing TGF- β 1), and OLC expanded after trypsinization (EXP-21) were evaluated and compared...
2018: International Journal of Cell Biology
https://www.readbyqxmd.com/read/29669950/effect-of-different-remaining-dentin-thickness-and-long-term-water-storage-on-dentin-bond-strength
#15
Shihchun Ting, A F M Almas Chowdhury, Jihao Sun, Shinichi Kakuda, Sharanbir K Sidhu, Yasuhiro Yoshida, Denis Selimovic, Hidehiko Sano
The purpose of this study was to investigate the effect of remaining dentin thickness (RDT) and long term water storage on dentin bond strength in-vitro. Twenty-seven third molars were randomly divided into 3 groups: Clearfil Bond SE ONE (SE1, Kuraray Noritake Dental, Okayama, Japan), G-Bond plus (GB, GC, Tokyo, Japan) and Clearfil Mega Bond (MB, Kuraray Noritake Dental). Bonded specimens were stored in water at 37ºC for 24 h. The teeth were then sectioned perpendicular to the adhesive interface to produce beams...
April 17, 2018: Dental Materials Journal
https://www.readbyqxmd.com/read/29665243/creating-virtual-3-dimensional-models-for-teaching-pre-clinical-tooth-preparation-students-usages-and-perceptions
#16
W S Lin, J C Chou, J R Charette, M J Metz, B T Harris, N Choi
PURPOSE: This research aimed to evaluate the students' usage and perceptions of using smartphones in their general dental education and learning tooth preparation with the individually designed virtual 3D instructional models in the pre-clinical removable partial denture course. MATERIALS AND METHODS: Second-year dental students were asked to voluntarily participate in a survey to investigate their demographic information, general usages of smartphones, perception of smartphones usage in dental education (construct 1) and perception of individually designed virtual 3D instructional models (construct 2)...
April 17, 2018: European Journal of Dental Education: Official Journal of the Association for Dental Education in Europe
https://www.readbyqxmd.com/read/29664965/correction-mechanical-properties-of-provisional-dental-materials-a-systematic-review-and-meta-analysis
#17
Daniela Astudillo-Rubio, Andrés Delgado-Gaete, Carlos Bellot-Arcís, José María Montiel-Company, Agustín Pascual-Moscardó, José Manuel Almerich-Silla
[This corrects the article DOI: 10.1371/journal.pone.0193162.].
2018: PloS One
https://www.readbyqxmd.com/read/29661580/preparation-and-characterization-of-bis-gma-free-dental-composites-with-dimethacrylate-monomer-derived-from-9-9-bis-4-2-hydroxyethoxy-phenyl-fluorene
#18
Jingwei He, Hilde M Kopperud
OBJECTIVE: Synthesize a new BPA-free monomer for use in methacrylate-based materials and evaluate critical properties of resin and composite materials based on the monomer. METHODS: Bis-EFMA was synthesized through reaction between 9,9-bis[4-(2-hydroxyethoxy)-phenyl]fluorene and 2-(methacryloyloxy)ethyl isocyanate. Experimental Bis-EFMA-based resin (Bis-EFMA/TEGDMA=50/50, wt./wt.) and composite were prepared. Critical properties were investigated according to standard or referenced methods Bis-GMA/TEGDMA (50/50, wt...
April 13, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29657526/comparative-abrasive-wear-resistance-and-surface-analysis-of-dental-resin-based-materials
#19
Maleeha Nayyer, Shahreen Zahid, Syed Hammad Hassan, Salman Aziz Mian, Sana Mehmood, Haroon Ahmed Khan, Muhammad Kaleem, Muhammad Sohail Zafar, Abdul Samad Khan
Objective: The objective of this study was to assess the surface properties (microhardness and wear resistance) of various composites and compomer materials. In addition, the methodologies used for assessing wear resistance were compared. Materials and Methods: This study was conducted using restorative material (Filtek Z250, Filtek Z350, QuiXfil, SureFil SDR, and Dyract XP) to assess wear resistance. A custom-made toothbrush simulator was employed for wear testing...
January 2018: European Journal of Dentistry
https://www.readbyqxmd.com/read/29657499/age-estimation-in-indian-adults-by-the-coronal-pulp-cavity-index
#20
Vaishali Vasant Koranne, Amit A Mhapuskar, Swati P Marathe, Sameer A Joshi, Rashmi S Saddiwal, Shams Ul Nisa
Background: Age estimation from tooth coronal index (TCI) using intraoral periapical radiographs by paralleling technique based on a reduction in the size of the dental pulp cavity with advancing age as a result of secondary dentin deposition. Aim and Objectives: The aim of this study is to estimate age for Indian adults using radiographs of mandibular first molar and second premolar teeth using coronal pulp cavity index. Materials and Methods: The study material consists of 400 intraoral periapical radiographs of mandibular second premolar and mandibular first molar from enrolled participants of either gender in the age group of 20-60 years...
September 2017: Journal of Forensic Dental Sciences
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