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https://www.readbyqxmd.com/read/29691662/microleakage-of-composite-crowns-luted-on-cad-cam-milled-human-molars-a-new-method-for-standardized-in-vitro-tests
#1
Maximiliane Amelie Schlenz, Alexander Schmidt, Peter Rehmann, Thomas Niem, Bernd Wöstmann
OBJECTIVES: To investigate debonding of full crowns made of CAD/CAM composites, CAD/CAM technology was applied to manufacture standardized test abutments to increase the reproducibility of human teeth used in in vitro studies. MATERIALS AND METHODS: A virtual test abutment and the corresponding virtual crown were designed and two STL data sets were generated. Sixty-four human third molars and CAD/CAM blocks were milled using a CNC machine. Crowns of four different composite blocks (Lava Ultimate (LU), Brilliant Crios (BC), Cerasmart (CS), Experimental (EX)) were adhesively bonded with their corresponding luting system (LU: Scotchbond Universal/RelyX Ultimate; BC: One Coat 7 Universal/DuoCem; CS: G-PremioBond/G-Cem LinkForce; EX: Experimental-Bond/Experimental-Luting-Cement)...
April 24, 2018: Clinical Oral Investigations
https://www.readbyqxmd.com/read/29691552/-cytotoxicity-of-3-resin-cements-to-human-gingival-fibroblasts
#2
Chang-Yuan Zhang, Gang Niu, Yi-Yi Jin, Hao Yu, Hui Cheng
PURPOSE: To study the cytotoxicity of 3 resin cements to human gingival fibroblasts (HGFs). METHODS: Three resin cements (Panavia F, RelyXTM Unicem and Multilink Speed) test samples were immersed and incubated in the culture medium for 48 h at 37degrees centigrade. Cultured HGFs were exposed to two concentrations (50% and 100%) of material elutes for 24 h, 72 h and 120 h. The proliferation rate was evaluated using CCK-8 assay. The data were statistically analyzed by one-way analysis of variance using SPSS 20...
December 2017: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
https://www.readbyqxmd.com/read/29691551/-experimental-research-of-hot-alkaline-solution-etching-treatment-on-zirconia-resin-bonding-strength
#3
Li-Yang Wan, Hong-Shui Zhu
PURPOSE: In this experiment, we applied hot alkaline solution (20%NaOH solutions) to treat the surfaces of zirconia ceramics in vitro, then evaluated the changes of bond strength of zirconia ceramics and resin cement. METHODS: Eighteen pieces of zirconia ceramic specimens were made, using the same method of grinding and polishing, and then randomly divided them into 3 groups: group A with hot alkali solution treatment (20%NaOH) (n=6), group B underwent sand blasting with a diameter of 110 ?m alumina particles (n=6), group C was as the control group...
December 2017: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
https://www.readbyqxmd.com/read/29691456/subsurface-endospore-forming-bacteria-possess-bio-sealant-properties
#4
Sreenivasulu Basha, Lakshman Kumar Lingamgunta, Jayakumar Kannali, Swarna Kumari Gajula, Ramesh Bandikari, Sreenivasulu Dasari, Veena Dalavai, Paramageetham Chinthala, Prasada Babu Gundala, Peera Kutagolla, Vinodh Kumar Balaji
Concrete is a strong and fairly inexpensive building substance, but has several disadvantages like cracking that allows corrosion, thus reducing its lifespan. To mitigate these complications, long-lasting microbial self-healing cement is an alternative that is eco-friendly and also actively repairs cracks. The present paper describes the detailed experimental investigation on compressive strength of cement mortars, mixed with six alkaliphilic bacteria, isolated from subsurface mica mines of high alkalinity...
April 24, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29691168/predicting-failure-in-early-acute-prosthetic-joint-infection-treated-with-debridement-antibiotics-and-implant-retention-external-validation-of-the-klic-score
#5
Claudia A M Löwik, Paul C Jutte, Eduard Tornero, Joris J W Ploegmakers, Bas A S Knobben, Astrid J de Vries, Wierd P Zijlstra, Baukje Dijkstra, Alex Soriano, Marjan Wouthuyzen-Bakker
BACKGROUND: Debridement, antibiotics, and implant retention (DAIR) is a widely used treatment modality for early acute prosthetic joint infection (PJI). A preoperative risk score was previously designed for predicting DAIR failure, consisting of chronic renal failure (K), liver cirrhosis (L), index surgery (I), cemented prosthesis (C), and C-reactive protein >115 mg/L (KLIC). The aim of this study was to validate the KLIC score in an external cohort. METHODS: We retrospectively evaluated patients with early acute PJI treated with DAIR between 2006 and 2016 in 3 Dutch hospitals...
March 27, 2018: Journal of Arthroplasty
https://www.readbyqxmd.com/read/29690550/study-on-cr-vi-leaching-from-cement-and-cement-composites
#6
Adriana Estokova, Lenka Palascakova, Maria Kanuchova
This paper reports an experimental study on hexavalent chromium leaching from cement samples and cement composites containing silica fume and zeolite additions that were subjected to various leaching agents. The water-soluble Cr(VI) concentrations in cements ranged from 0.2 to 3.2 mg/kg and represented only 1.8% of the total chromium content. The presence of chromium compounds with both chromium oxidation states of III and VI was detected in the cement samples by X-ray photoelectron spectroscopy (XPS). Leaching tests were performed in a Britton-Robinson buffer to simulate natural conditions and showed increased dissolution of Cr(VI) up to 6 mg/kg...
April 22, 2018: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29687410/laser-led-phototherapy-on-the-repair-of-tibial-fracture-treated-with-wire-osteosynthesis-evaluated-by-raman-spectroscopy
#7
Antônio L B Pinheiro, Luiz G P Soares, Aline C P da Silva, Nicole R S Santos, Anna Paula L T da Silva, Bruno Luiz R C Neves, Amanda P Soares, Landulfo Silveira
The aim of the present study was to assess, by means of Raman spectroscopy, the repair of complete surgical tibial fractures fixed with wire osteosynthesis (WO) treated or not with infrared laser (λ780 nm) or infrared light emitting diode (LED) (λ850 ± 10 nm) lights, 142.8 J/cm2 per treatment, associated or not to the use of mineral trioxide aggregate (MTA) cement. Surgical tibial fractures were created on 18 rabbits, and all fractures were fixed with WO and some groups were grafted with MTA. Irradiated groups received lights at every other day during 15 days, and all animals were sacrificed after 30 days, being the tibia removed...
April 23, 2018: Lasers in Medical Science
https://www.readbyqxmd.com/read/29683811/is-cement-augmentation-a-viable-treatment-option-for-an-osteoporotic-compression-fracture
#8
Saad B Chaudhary, Jason W Savage
No abstract text is available yet for this article.
April 20, 2018: Clinical Spine Surgery
https://www.readbyqxmd.com/read/29683803/is-cemented-or-cementless-femoral-stem-fixation-more-durable-in-patients-older-than-75-years-of-age-a-comparison-of-the-best-performing-stems
#9
Michael Tanzer, Stephen E Graves, Andrea Peng, Andrew J Shimmin
BACKGROUND: There is ongoing debate concerning the best method of femoral fixation in older patients receiving primary THA. Clinical studies have shown high survivorship for cemented and cementless femoral stems. Arthroplasty registry studies, however, have universally shown that cementless stems are associated with a higher rate of revision in this patient population. It is unclear if the difference in revision rate is a reflection of the range of implants being used for these procedures rather than the mode of fixation...
April 9, 2018: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/29682992/higher-periprosthetic-fracture-rate-associated-with-use-of-modern-uncemented-stems-compared-to-cemented-stems-in-femoral-neck-fractures
#10
Jin Soo A Song, Daryl Dillman, Dave Wilson, Michael Dunbar, Glen Richardson
INTRODUCTION: Hemiarthroplasty is the preferred treatment for displaced femoral neck fractures in elderly patients. Recently, short tapered-wedge cementless stems have increasingly been used in this population. However, historic data has consistently shown higher rates of periprosthetic fracture with uncemented stems in hip fracture patients. This study aims to evaluate the rate of periprosthetic fracture requiring re-operation and all-cause mortality between cemented and uncemented femoral stem designs including more recent short tapered-wedge cementless stems in hip fracture patients...
April 1, 2018: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/29682752/mineral-density-in-carious-dentine-after-treatment-with-calcium-silicates-and-polyacrylic-acid-based-cements
#11
P M Pires, T P Santos, A Fonseca-Gonçalves, M M Pithon, R T Lopes, A A Neves
AIM: To test the hypothesis that polyacrylic acid-based and calcium silicate materials are able to increase mineral density of artificially demineralized dentine produced by a microcosm model for caries formation. METHODOLOGY: Forty-five dentine cavities were prepared in 9 sound human third molars (5 in each tooth). Specimens received a bacterial inoculum and were incubated in BHI plus 5% of sucrose for 96h to allow biofilm formation. After that, the specimens were scanned in a high energy micro-CT (baseline stack) and then, each cavity was filled with different cements: zinc polycarboxylate (Poly Zinc™ , Prevest DenPro, Jammu, India), conventional glass ionomer (Ketac Molar, 3M ESPE, Seefeld, Germany) and two calcium silicate based materials (MTA, Angelus, Londrina, Brazil and Biodentine™ , Septodont, Saint Maur des Fosses, France) while the central cavity was filled with utility wax (negative control)...
April 22, 2018: International Endodontic Journal
https://www.readbyqxmd.com/read/29682570/influence-of-polishing-methods-on-the-bonding-effectiveness-and-durability-of-different-resin-cements-to-dentin
#12
Lingyan Ren, Mingfei Li, Yahui Pan, Xiangfeng Meng
The purpose of this study was to investigate the impact of polishing methods on the bonding effectiveness and durability of different resin cements to dentin. The dentin surfaces were either treated with a fine-grit diamond bur (polishing A) or further polished by polishing disks (polishing B), and then they were bonded with any one of the three resin cements, namely, etch-and-rinse, self-etch, and self-adhesive resin cements. After 24-hour or 2-year water storage, a microtensile bond strength ( μ TBS) test was performed...
2018: BioMed Research International
https://www.readbyqxmd.com/read/29682261/cement-layer-thickness-and-shear-stress-resistance-in-cylindrical-dowel-spaces-pull-out-test
#13
M Andreasi Bassi, D Lauritano, M Brizzi, C Andrisani, S Lico, V Candotto
Purpose: This study evaluated the effects of different dowel space (DS) diameters on pull-out bond strength of a cylindrical post, of threaded steel, to dentin. Materials and methods: Forty-five extracted human teeth were divided in 3 groups with DSs, with the same depth (6 mm), differing for the diameter (i.e. 1.5 mm, Group 1; 1.75 mm, Group 2; 2.00 mm, Group 3). Both the diameter of the post (1.3 mm) and the composite resin cement (Panavia 21) were the same for all the samples...
October 2017: Oral & Implantology
https://www.readbyqxmd.com/read/29682002/household-air-pollution-hap-microenvironment-and-child-health-strategies-for-mitigating-hap-exposure-in-urban-rwanda
#14
Ipsita Das, Joseph Pedit, Sudhanshu Handa, Pamela Jagger
Exposure to household air pollution (HAP) from cooking and heating with solid fuels is major risk factor for morbidity and mortality in sub-Saharan Africa. Children under five are particularly at risk for acute lower respiratory infection. We use baseline data from randomized controlled trial evaluating a household energy intervention in Gisenyi, Rwanda to investigate the role of the microenvironment as a determinant of children's HAP-related health symptoms. Our sample includes 529 households, with 694 children under five...
2018: Environmental Research Letters: ERL [Web Site]
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
#15
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/29681059/treatment-of-single-maxillary-gingival-recession-associated-with-non-carious-cervical-lesion-randomized-clinical-trial-comparing-connective-tissue-graft-alone-to-graft-plus-partial-restoration
#16
Mauro Pedrine Santamaria, Camila Augusto Silveira, Ingrid Fernandes Mathias, Felipe Lucas da Silva Neves, Lúcio Murilo Dos Santos, Maria Aparecida Neves Jardini, Dimitris N Tatakis, Enilson Antônio Sallum, Eduardo Bresciani
BACKGROUND: Gingival recession is frequently associated with non-carious cervical lesion (NCCL) forming a combined defect (CD). The aim of this study was to evaluate a new multidisciplinary protocol for CDs. METHODS: Forty patients presenting 40 Miller's Class I or II gingival recession defects associated with B+ tooth cervical defect were randomly allocated to one of the following treatments: Test Group (n=20), partial restoration of the NCCL, in which the apical border of the restoration was placed 1mm beyond the cement-enamel junction estimation, and connective tissue graft (CTG+PR) and Control Group (n=20), odontoplasty of the NCCL and connective tissue graft (CTG)...
April 22, 2018: Journal of Clinical Periodontology
https://www.readbyqxmd.com/read/29680761/vitrified-medical-wastes-bottom-ash-in-cement-clinkerization-microstructural-hydration-and-leaching-characteristics
#17
S Papamarkou, D Christopoulos, P E Tsakiridis, G Bartzas, K Tsakalakis
The present investigation focuses on the utilization of medical wastes incineration bottom ash (MBA), vitrified with soda lime recycled glass (SLRG), as an alternative raw material in cement clinkerization. Bottom ash is recovered from the bottom of the medical wastes incineration chamber, after being cooled down through quenching. It corresponds to 10-15 wt% of the initial medical wastes weight and since it has been classified in the category of hazardous wastes, its safe management has become a major environmental concern worldwide...
April 19, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29680723/mineral-trioxide-aggregate-with-mussel-inspired-surface-nanolayers-for-stimulating-odontogenic-differentiation-of-dental-pulp-cells
#18
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/29680721/immediate-and-delayed-repair-of-2-sizes-of-furcal-perforations-in-dogs-teeth-using-mineral-trioxide-aggregate-cement
#19
Reem Siraj Alsulaimani
INTRODUCTION: This histologic study aimed to measure the morphometric and morphologic changes in periodontal tissue after immediate and delayed mineral trioxide aggregate (MTA) repair of 2 sizes of furcal perforations. METHODS: There were 72 premolars from 12 beagle dogs that were divided equally into 4 experimental and 2 control groups (n = 12). Experimental groups included immediate small (0.6 mm in diameter), immediate large (1.8 mm in diameter), delayed (30 days) small, and delayed large furcal perforation MTA repair...
April 18, 2018: Journal of Endodontics
https://www.readbyqxmd.com/read/29679950/morbidity-and-mortality-following-total-hip-replacement-in-dogs
#20
William D Liska, Sarah K Israel
OBJECTIVE:  The objective of this study was to determine morbidity and mortality rates in dogs that had undergone a total hip replacement surgery with implantation of either a cemented or a cementless prosthesis (BioMedtrix LLC, Whippany, NJ). METHODS:  The survival time after surgery, the date of death and the cause of death were collated from an ongoing registry maintained on consecutive total hip replacement procedures by a single surgeon. RESULTS:  A review of the 1,864 dogs entered in the total hip replacement registry revealed 642 in which the date of death and cause of death were known...
April 21, 2018: Veterinary and Comparative Orthopaedics and Traumatology: V.C.O.T
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