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https://www.readbyqxmd.com/read/29779218/an-analysis-of-the-timing-and-materials-associated-with-pulp-disease-following-restorative-dental-treatment
#1
J B Yong, S Sivarajan, P V Abbott
AIM: To assess whether the timing of pulp disease after tooth restoration was associated with type of restorative dental material used, extent of the restoration, or tooth type. METHODOLOGY: A comprehensive search and analysis of data using the Titanium Oral Health Management software program at The Oral Health Centre of Western Australia was performed to correlate procedural codes for teeth that had restorations placed and subsequently developed pulp disease requiring endodontic treatment or extraction from 1st January 2009 to 31st December 2013...
May 19, 2018: International Endodontic Journal
https://www.readbyqxmd.com/read/29778127/study-of-two-body-wear-performance-of-dental-materials
#2
Xin Hu, Qian Zhang, Jia Ning, Wenmeng Wu, Changyi Li
INTRODUCTION: The purpose of this study was to evaluate the two-body wear resistances of natural enamel and four dental materials in vitro. METHODS: The testing machine was modified to form a type of pin-on-disk wear test apparatus. Four dental material specimens (Au-Pd alloy, Ag-Pd alloy, FiltekTMP60 and FiltekTMZ350 composite resins) and enamel were used as the pins, and a steatite ceramic grinding wheel was used as the abrasive counter face. The wear volume loss and the rigidity value was measured...
June 2018: Journal of the National Medical Association
https://www.readbyqxmd.com/read/29776851/treatment-planning-dose-accuracy-improvement-in-the-presence-of-dental-implants
#3
Holly M Parenica, John R Ford, Panayiotis Mavroidis, Ying Li, Nikos Papanikolaou, Sotirios Stathakis
Streaking artifacts in computed tomography (CT) scans caused by metallic dental implants (MDIs) can lead to inaccuracies in dose calculations. This study quantifies and compares the effect of MDIs on dose distributions using the collapsed cone convolution superposition (CCCS) and Monte Carlo (MC) algorithms, with and without correcting for the density of the MDIs. Ion chamber measurements were taken to test the ability of the algorithms in Pinnacle3 and Monaco to calculate dose near high-Z materials. Nine previously treated patients with head and neck cancer were included in this study...
May 15, 2018: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/29776537/comparative-study-on-metabolite-level-in-tissue-specific-human-mesenchymal-stem-cells-by-an-ultra-performance-liquid-chromatography-quadrupole-time-of-flight-mass-spectrometry
#4
Seul Ji Lee, TacGhee Yi, Soo Hyun Ahn, Dong Kyu Lim, Si-Na Kim, Hyun-Joo Lee, Yun-Kyoung Cho, Jae-Yol Lim, Jong-Hyuk Sung, Jeong-Ho Yun, Johan Lim, Sun U Song, Sung Won Kwon
Mesenchymal stem cells (MSCs) are a promising therapeutic option for cell-based therapy due to their immunomodulatory and regenerative properties. They can be isolated from various adult tissues, including bone marrow, fat, dental tissue, and glandular tissue. Although they share common characteristics, little is known about the biological differences between MSC populations derived from different tissues. In this study, we used MS to compare the endogenous metabolite level in the human MSCs originating from the bone marrow, adipose tissue, periodontal ligaments, and salivary glands...
September 18, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29774969/combined-effect-of-parathyroid-hormone-and-strontium-ranelate-on-bone-healing-in-ovariectomized-rats
#5
Funda Göker, Selim Ersanlı, Volkan Arısan, Erdal Cevher, Emine Elif Güzel, Halim İşsever, Beyhan Ömer, Gülay Durmuş Altun, Deniz Morina, Tuğba Ekiz Yılmaz, Elmire Dervişoğlu, Massimo Del Fabbro
OBJECTIVE: Parathyroid hormone (PTH) enhances bone healing. Strontium ranelate (SR) is an antiresorptive agent that increases bone formation. Reports about combined effects of PTH and SR on local bone regeneration in osteoporotic subjects are limited. We aimed at investigating the efficacy of PTH and SR for promoting new bone formation in critical sized defects of ovariectomized rats. MATERIALS AND METHODS: PTH- and/or SR-containing poloxamer implant tablets with/without chitosan microparticles were delivered locally to calvarial defects of 90 Wistar rats...
May 18, 2018: Oral Diseases
https://www.readbyqxmd.com/read/29771975/development-and-characterization-of-an-oral-multispecies-biofilm-implant-flow-chamber-model
#6
Nadine Kommerein, Katharina Doll, Nico S Stumpp, Meike Stiesch
Peri-implant infections are the most common cause of implant failure in modern dental implantology. These are caused by the formation of biofilms on the implant surface and consist of oral commensal and pathogenic bacteria, which harm adjacent soft and hard tissues and may ultimately lead to implant loss. In order to improve the clinical situation, there has to be a better understanding of biofilm formation on abiotic surfaces. Therefore, we successfully developed a system to cultivate an oral multispecies biofilm model in a flow chamber system, optimized for the evaluation of biofilm formation on solid materials by direct microscopic investigation...
2018: PloS One
https://www.readbyqxmd.com/read/29770172/prevention-of-cross-contamination-risk-by-disinfection-of-irreversible-hydrocolloid-impression-materials-with-ozonated-water
#7
Omid Savabi, Farahnaz Nejatidanesh, Kamran Poshang Bagheri, Leila Karimi, Ghazal Savabi
Background: Disinfection of dental impression is mandatory for preventing the cross infection between dental staff and dental laboratory. Ozone as a disinfectant can be used in various ways in dentistry. The aim of this study was to evaluate the efficacy of ozonated water for disinfection of irreversible hydrocolloid impression materials and preventing cross-contamination. Methods: Thirty-two circular specimens (1 cm diameter and 2 mm thickness) of irreversible hydrocolloid impression material were made...
2018: International Journal of Preventive Medicine
https://www.readbyqxmd.com/read/29768437/oral-health-status-in-historic-population-macroscopic-and-metagenomic-evidence
#8
Claire Willmann, Xavier Mata, Kristian Hanghoej, Laure Tonasso, Lenka Tisseyre, Céline Jeziorski, Elodie Cabot, Pierre Chevet, Eric Crubézy, Ludovic Orlando, Rémi Esclassan, Catherine Thèves
Recent developments in High-Throughput DNA sequencing (HTS) technologies and ancient DNA (aDNA) research have opened access to the characterization of the microbial communities within past populations. Most studies have, however, relied on the analysis of dental calculus as one particular material type particularly prone to the molecular preservation of ancient microbial biofilms and potential of entire teeth for microbial characterization, both of healthy communities and pathogens in ancient individuals, remains overlooked...
2018: PloS One
https://www.readbyqxmd.com/read/29764698/translucency-thresholds-for-dental-materials
#9
Marianne Salas, Cristina Lucena, Luis Javier Herrera, Ana Yebra, Alvaro Della Bona, María M Pérez
OBJECTIVE: To determine the translucency acceptability and perceptibility thresholds for dental resin composites using CIEDE2000 and CIELAB color difference formulas. METHODS: A 30-observer panel performed perceptibility and acceptability judgments on 50 pairs of resin composites discs (diameter: 10mm; thickness: 1mm). Disc pair differences for the Translucency Parameter (ΔTP) were calculated using both color difference formulas (ΔTP00 ranged from 0.11 to 7.98, and ΔTPab ranged from 0...
May 12, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29764099/assessment-of-treatment-field-isolation-during-scaling-root-planing-and-rinsing
#10
Michel Gigandet, Deborah Hofer, Thomas Attin, Philipp Sahrmann, Patrick R Schmidlin
Aim: Intensive application of highly concentrated antimicrobials during scaling and root planing may be hazardous if swallowed in quantity. This study evaluates two dental isolation systems for fluid leakage in conjunction with a sham treatment of scaling and root planing. Materials and methods: Eight volunteers were randomly assigned to wear a conventional rubber dam (RD) and a combined suction and isolation device (IsoLite® system [IL]) alternatively on contralateral maxillary and mandibular quadrants. RD was cut between the canine and the first molar and was fixed on the first molar with a rubber dam clamp and with a tissue adhesive (Histoacryl) on the gingiva...
May 16, 2018: Swiss Dental Journal
https://www.readbyqxmd.com/read/29763965/proximal-restoration-increases-the-risk-of-clinical-attachment-loss
#11
Kauê Collares, Flávio F Demarco, Bernardo L Horta, Marcos B Correa
AIM: To estimate the effect of proximal direct restorations in the adjacent periodontal tissues in adults from a birth cohort. MATERIALS AND METHODS: A representative sample (n = 539) of all 5,914 births occurring in Pelotas, Brazil in 1982 was prospectively investigated, being clinical attachment loss (CAL), probing depth (PD) and bleeding on probing (BOP) assessed at 31 yrs-old. For each site, tooth surface was evaluated as sound or restored, being the restoration extension (subgingival or supragingival) and restoration material (composite and amalgam) considered...
May 15, 2018: Journal of Clinical Periodontology
https://www.readbyqxmd.com/read/29760822/influence-of-lateral-cephalometric-radiographs-on-orthodontic-treatment-planning-of-class-ii-patients
#12
Irina Stupar, Enver Yetkiner, Daniel Wiedemeier, Thomas Attin, Rengin Attin
Background: Lateral Cephalometric Radiographs (LCR) are a common decision-making aid in orthodontic treatment planning and are routinely used in clinical practice. The aim of this present study was to test the null hypothesis that LCR evaluation does not alter specific components of orthodontic treatment planning in Class II patients. Materials and Methods: Records of 75 patients, who had been treated at the Department of Orthodontics, Centre of Dental Medicine, University of Zurich comprised the study material...
2018: Open Dentistry Journal
https://www.readbyqxmd.com/read/29759826/framework-design-and-pontics-of-fiber-reinforced-composite-fixed-dental-prostheses-an-overview
#13
REVIEW
Leila Perea-Lowery, Pekka K Vallittu
PURPOSE: Fiber-reinforced composite (FRC) fixed dental prostheses (FDPs) have shown good performance in clinical applications due to their good mechanical properties and minimally invasive approach. However, typical failure patterns of FRC FDPs are often localized at the pontic site. That reflects the structural considerations at the framework and pontic location that need to be examined when creating these kinds of prostheses. STUDY SELECTION: Peer-reviewed articles and other scientific literature were reviewed for providing up-to-date information on how pontics of FRC FDPs can be made...
May 11, 2018: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/29756213/the-influence-of-different-soft-tissue-grafting-procedures-at-single-implant-placement-on-esthetics-a-randomized-controlled-trial
#14
Elise G Zuiderveld, Henny J A Meijer, Arjan Vissink, Gerry M Raghoebar
BACKGROUND: Soft tissue grafting to thicken the soft tissue around dental implants was proposed to ameliorate the esthetic outcome. Traditionally, connective tissue is used as a grafting material, but a xenogeneic collagen matrix was introduced as an alternative to reduce patient morbidity. METHODS: Sixty patients randomly received either no graft (n = 20, NG group), a connective tissue graft (n = 20, CTG group) or a xenogeneic collagen matrix (n = 20, XCM group) when placing an implant in a preserved alveolar ridge...
May 13, 2018: Journal of Periodontology
https://www.readbyqxmd.com/read/29755637/elastic-modulus-and-thermal-conductivity-of-thiolene-tio-2-nanocomposites
#15
Eugen Schechtel, Yaping Yan, Xiangfan Xu, Yu Cang, Wolfgang Tremel, Zuyuan Wang, Baowen Li, George Fytas
Metal oxide based polymer nanocomposites find diverse applications as functional materials, and in particular thiol-ene/TiO2 nanocomposites are promising candidates for dental restorative materials. The important mechanical and thermal properties of the nanocomposites, however, are still not well understood. In this study, the elastic modulus and thermal conductivity of thiol-ene/TiO2 nanocomposite thin films with varying weight fractions of TiO2 nanoparticles are investigated by using Brillouin light scattering spectroscopy and 3ω measurements, respectively...
November 16, 2017: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/29755618/wear-of-resin-composites-current-insights-into-underlying-mechanisms-evaluation-methods-and-influential-factors
#16
REVIEW
Akimasa Tsujimoto, Wayne W Barkmeier, Nicholas G Fischer, Kie Nojiri, Yuko Nagura, Toshiki Takamizawa, Mark A Latta, Masashi Miazaki
The application of resin composites in dentistry has become increasingly widespread due to the increased aesthetic demands of patients, improvements in the formulation of resin composites, and the ability of these materials to bond to tooth structures, together with concerns about dental amalgam fillings. As resistance to wear is an important factor in determining the clinical success of resin composite restoratives, this review article defines what constitutes wear and describes the major underlying phenomena involved in this process...
May 2018: Japanese Dental Science Review
https://www.readbyqxmd.com/read/29754903/gigantism-precedes-filter-feeding-in-baleen-whale-evolution
#17
R Ewan Fordyce, Felix G Marx
Baleen whales (Mysticeti) are the largest animals on Earth, thanks to their ability to filter huge volumes of small prey from seawater. Mysticetes appeared during the Late Eocene, but evidence of their early evolution remains both sparse and controversial [1, 2], with several models competing to explain the origin of baleen-based bulk feeding [3-6]. Here, we describe a virtually complete skull of Llanocetus denticrenatus, the second-oldest (ca. 34 Ma) mysticete known. The new material represents the same individual as the type and only specimen, a fragmentary mandible...
May 4, 2018: Current Biology: CB
https://www.readbyqxmd.com/read/29754742/mesopithecus-pentelicus-from-the-turolian-locality-of-kryopigi-kassandra-chalkidiki-greece
#18
Georgios Lazaridis, Evangelia Tsoukala, Todd C Rae, Asier Gómez-Olivencia, Doris Nagel, Antonis Bartsiokas
New material of the Mio-Pliocene colobine Mesopithecus from the Turolian locality of Kryopigi (Greece) is described here. It includes a complete skull with the atlas attached and other dental and postcranial elements representing at least five individuals (four males and one female). The material is compared with Mesopithecus delsoni, Mesopithecus pentelicus, Mesopithecus monspessulanus and intermediate forms from more than a dozen Turolian localities of the Greco-Iranian province. These comparisons support the attribution of the Kryopigi material to M...
May 10, 2018: Journal of Human Evolution
https://www.readbyqxmd.com/read/29754153/-implementation-of-effective-infection-control-furnishing-a-dental-practice
#19
A M G A Laheij, J J de Soet, C M C Volgenant
The increasing resistance to antibiotics and the aging of the population of patients who visit the dental practice can lead to more frequent infections with (resistant) microorganisms. The prevention of cross contamination by the implementation of effective measures in the area of hygiene and procedures of infection control is therefore important. The furnishing of a dental practice can play an important part in prevention. What are the important issues in furnishing a practice? A distinction is made between 'critical' and 'non-critical' rooms...
May 2018: Nederlands Tijdschrift Voor Tandheelkunde
https://www.readbyqxmd.com/read/29751113/short-time-dental-resin-biostability-and-kinetics-of-enzymatic-degradation
#20
Xiaohong Wang, Sheng Song, Lei Chen, Christopher M Stafford, Jirun Sun
Resin biostability is of critical importance to the durability of methacrylate-based dental resin restorations. Current methods for evaluating biostability take considerable time, from weeks to months, and provide no short-time kinetics of resin degradation. The objective of this study is to develop a more sensitive method to assess resin biostability over short-time spans (hours to days) that will enhance our understanding of biostability and its resin chemistry. Ultra-flat resin films of equimolar urethane dimethacrylate (UDMA) and triethylene glycol dimethacrylate (TEGDMA) are produced through photo-curing between two flat surfaces...
May 8, 2018: Acta Biomaterialia
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