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https://www.readbyqxmd.com/read/29238488/effect-of-hydrofluoric-acid-surface-treatments-on-micro-shear-bond-strength-of-cad-cam-ceramics
#1
Faraneh Mokhtarpour, Homayoon Alaghehmand, Soraya Khafri
Introduction: Dental ceramics are appreciated as highly esthetic restorative materials that can simulate the appearance of natural dentition better than other materials. The aim of this study was to evaluate the effect of hydrofluoric acid concentration and etching time on micro-shear bond strength (μSBS) to IPS e.max CAD and Vita Mark II of a dual cured resin cement (Panavia F2.0). Methods: This study was an experimental in vitro study, performed in the dental material research center of Babol University of Medical Sciences in 2016...
October 2017: Electronic Physician
https://www.readbyqxmd.com/read/29234746/short-implants-as-an-alternative-to-crestal-sinus-lift-a-3-year-multicentre-randomised-controlled-trial
#2
Giorgio Gastaldi, Pietro Felice, Roberto Pistilli, Carlo Barausse, Anna Trullenque-Eriksson, Marco Esposito
PURPOSE: To evaluate the efficacy of short (5 or 6 mm long) dental implants vs 10 mm or longer implants placed in crestally lifted sinuses. MATERIALS AND METHODS: Twenty partially edentulous patients with 5 to 7 mm of residual crestal height and at least 7 mm thickness below the maxillary sinuses as measured on computed tomography scans were randomised according to a parallel group design to receive either one to two 5 or 6 mm long implants (10 patients) or 10 mm long implants (10 patients) after crestal sinus lifting and grafting with anorganic bovine bone...
2017: European Journal of Oral Implantology
https://www.readbyqxmd.com/read/29225652/repair-of-iatrogenic-furcal-perforation-with-mineral-trioxide-aggregate-a-seven-year-follow-up
#3
Jardel Camilo do Carmo Monteiro, Mateus Rodrigues Tonetto, Matheus Coêlho Bandeca, Alvaro Henrique Borges, José Cláudio Martins Segalla, Keren Cristina Fagundes Jordão-Basso, Cristian Fernando Sanchez-Puetate, Milton Carlos Kuga
Teeth with furcal perforation present difficult resolution and dubious prognosis. Several materials have been proposed and calcium silicate-based cements such as mineral trioxide aggregate (MTA) are the most recommended. However, its long-term clinical behavior still remains poorly understood. The present study reports a clinical case of furcal perforation repair using Angelus MTA, with a 7-year follow-up. Patient sought treatment 2 months after iatrogenic accident. First lower right molar presented clinical signs such as fistula and bone loss between mesial and distal roots...
2017: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/29225280/quaternary-ammonium-compounds-in-dental-restorative-materials
#4
Yu Zhang, Yinyan Chen, Yuntong Hu, Fang Huang, Yuhong Xiao
Quaternary ammonium compounds (QACs) have been used widely in medicine, owing to their antimicrobial properties. They also have strong permeability, stable performance, low skin irritation, low toxicity, low corrosion, lasting biological effects and so on, comparing with other antimicrobial agents. At the end of last century, polymerizable quaternary ammonium antimicrobial monomers had been synthesized and applied in dentistry, in order to reduce or prevent microbial biofilm formation on dental materials surfaces...
December 8, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/29211349/evaluation-of-the-cytotoxicity-of-selected-conventional-glass-ionomer-cements-on-human-gingival-fibroblasts
#5
Grażyna Marczuk-Kolada, Elżbieta Łuczaj-Cepowicz, Małgorzata Pawińska, Adam Hołownia
BACKGROUND: Dentistry materials are the most frequently used substitutes of human tissues. Therefore, an assessment of dental filling materials should cover not only their chemical, physical, and mechanical characteristics, but also their cytotoxicity. OBJECTIVES: To compare the cytotoxic effects of 13 conventional glass ionomer cements on human gingival fibroblasts. MATERIAL AND METHODS: The assessment was conducted using the MTT test. Six samples were prepared for each material...
October 2017: Advances in Clinical and Experimental Medicine: Official Organ Wroclaw Medical University
https://www.readbyqxmd.com/read/29208791/effect-of-temperature-on-film-thickness-of-two-types-of-commonly-used-luting-cements
#6
M Praveen Kumar, Reddy Priyadarshini, Yasangi M Kumar, K Shanthi Priya, Chunchuvyshnavi Chunchuvyshnavi, Harika Yerrapragada
AIM: The aim of this study is to evaluate the effect of temperature change on film thickness of both types of cements. MATERIALS AND METHODS: Totally, 60 samples were prepared with 10 in each subgroup, thus comprising 30 in each group. Materials tested were glass ionomer cement (GIC) type I and zinc phosphate type I. Samples were manipulated with manufacturer's instructions and tested according to American Dental Association (ADA) guidelines. RESULTS: The mean values of film thickness were recorded for both groups I and II...
December 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/29207837/fracture-resistance-of-endodontically-treated-teeth-restored-with-biodentine-resin-modified-gic-and-hybrid-composite-resin-as-a-core-material
#7
Dayalan Subash, Krishnamma Shoba, Shibu Aman, Srinivasan Kumar Indu Bharkavi, Vijayan Nimmi, Radhakrishnan Abhilash
Introduction: The restoration of a severely damaged tooth usually needs a post and core as a part of treatment procedure to provide a corono - radicular stabilization. Biodentine is a class of dental material which possess high mechanical properties with excellent biocompatibility and bioactive behaviour. The sealing ability coupled with optimum physical properties could make Biodentine an excellent option as a core material. Aim: The aim of the study was to determine the fracture resistance of Biodentine as a core material in comparison with resin modified glass ionomer and composite resin...
September 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/29204250/generation-and-role-of-reactive-oxygen-and-nitrogen-species-induced-by-plasma-lasers-chemical-agents-and-other-systems-in-dentistry
#8
REVIEW
Nayansi Jha, Jae Jun Ryu, Eun Ha Choi, Nagendra Kumar Kaushik
The generation of reactive oxygen and nitrogen species (RONS) has been found to occur during inflammatory procedures, during cell ischemia, and in various crucial developmental processes such as cell differentiation and along cell signaling pathways. The most common sources of intracellular RONS are the mitochondrial electron transport system, NADH oxidase, and cytochrome P450. In this review, we analyzed the extracellular and intracellular sources of reactive species, their cell signaling pathways, the mechanisms of action, and their positive and negative effects in the dental field...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/29197431/measuring-adherence-to-evidence-based-clinical-practice-guidelines
#9
Richard Clark, Utsana Tonmukayakul, Yvonne Mangan, Michael Smith, Mark Gussy, David Manton, Denise Bailey, Hanny Calache
OBJECTIVES: Dental Health Services Victoria publishes evidence-based clinical practice guidelines (CPGs) to assist public oral health practitioners to provide high-quality dental care. How well these CPGs are implemented into practice is unknown. The aim of this study was to assess adherence to selected CPGs. METHODS: An electronic auditing tool was developed using clinical indicators derived for "stainless steel crown (SSC)," "restorative care for children under general anesthetic (GA)," and "direct restorative materials" CPG...
December 2017: Journal of Evidence-based Dental Practice
https://www.readbyqxmd.com/read/29194830/effect-of-intraoral-mechanical-cleaning-techniques-on-bond-strength-of-cast-crowns-to-metal-cores
#10
Sahar AlZain, Mathew T Kattadiyil, Abdulaziz AlHelal, Ali Alqahtani
PURPOSE: To evaluate the effect of cleaning of metal cores from provisional cement, using an intraoral airborne-particle abrasion method, on the bond strength of permanent resin cement with cast crowns to cores. MATERIALS AND METHODS: Thirty stainless steel models of a standard complete crown tooth preparation were fabricated. Thirty Type III gold crowns were fabricated. Each cast crown corresponded to one stainless steel crown preparation model. All crowns were cemented with noneugenol zinc oxide cement and stored for 7 days at 37°C...
November 30, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29183670/using-glass-graded-zirconia-to-increase-delamination-growth-resistance-in-porcelain-zirconia-dental-structures
#11
Herzl Chai, Adam J Mieleszko, Stephen J Chu, Yu Zhang
OBJECTIVE: Porcelain fused to zirconia (PFZ) restorations are widely used in prosthetic dentistry. However, their tendency to delaminate along the P/Z interface remains a practical problem so that assessing and improving the interfacial strength are important design aspects. This work examines the effect of modifying the zirconia veneering surface with an in-house felspathic glass on the interfacial fracture resistance of fused P/Z. METHODS: Three material systems are studied: porcelain fused to zirconia (control) and porcelain fused to glass-graded zirconia with and without the presence of a glass interlayer...
November 25, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29179973/mechanism-of-bioactive-molecular-extraction-from-mineralized-dentin-by-calcium-hydroxide-and-tricalcium-silicate-cement
#12
Xue-Qing Huang, John Camba, Li-Sha Gu, Brian E Bergeron, Domenico Ricucci, David H Pashley, Franklin R Tay, Li-Na Niu
OBJECTIVES: The objective of the present study was to elucidate the mechanism of bioactive molecule extraction from mineralized dentin by calcium hydroxide (Ca(OH)2) and tricalcium silicate cements (TSC). METHODS AND RESULTS: Transmission electron microscopy was used to provide evidence for collagen degradation in dentin surfaces covered with Ca(OH)2 or a set, hydrated TSC for 1-3 months. A one micron thick collagen degradation zone was observed on the dentin surface...
November 24, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29171091/internal-fit-of-three-unit-fixed-dental-prostheses-produced-by-computer-aided-design-computer-aided-manufacturing-and-the-lost-wax-metal-casting-technique-assessed-using-the-triple-scan-protocol
#13
Bjørn E Dahl, Jon E Dahl, Hans J Rønold
Suboptimal adaptation of fixed dental prostheses (FDPs) can lead to technical and biological complications. It is unclear if the computer-aided design/computer-aided manufacturing (CAD/CAM) technique improves adaptation of FDPs compared with FDPs made using the lost-wax and metal casting technique. Three-unit FDPs were manufactured by CAD/CAM based on digital impression of a typodont model. The FDPs were made from one of five materials: pre-sintered zirconium dioxide; hot isostatic pressed zirconium dioxide; lithium disilicate glass-ceramic; milled cobalt-chromium; and laser-sintered cobalt-chromium...
November 24, 2017: European Journal of Oral Sciences
https://www.readbyqxmd.com/read/29153746/degree-of-conversion-of-resin-cement-with-varying-methacrylate-compositions-used-to-cement-fiber-dowels-a-raman-spectroscopy-study
#14
Abdulelah M BinMahfooz, Osama A Qutub, Thamer Y Marghalani, Mohammed F Ayad, Abdulhamaid A Maghrabi
STATEMENT OF PROBLEM: Studies on the degree of conversion of dental cement in relation to the number of methacrylate components are lacking. PURPOSE: The purpose of this in vitro study was to evaluate the degree of conversion of single- and multicomponent methacrylate-containing dental cements around opaque and translucent fiber dowels at varying depths. MATERIAL AND METHODS: Teeth were prepared for standard endodontic therapy, and a dowel space was created...
November 15, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29152618/effect-of-mechanical-fatigue-on-the-bond-between-zirconia-and-composite-cement
#15
Hugo A Vidotti, Ricardo M Carvalho, Paulo G Coelho, Willian F Zambuzzi, Gerson Bonfante, Accácio L do Valle, Estevam A Bonfante
PURPOSE: To examine the effect of mechanical fatigue on the bond strength of resin composite cemented to silicacoated yttria-tetragonal zirconia polycrystal ceramic (Y-TZP). MATERIALS AND METHODS: Ten Y-TZP blocks were polished down to 600-grit silicon carbide paper. Specimens were silica coated by airborne-particle abrasion with 30-μm silica-modified Al2O3 particles. Blocks were cleaned in an ultrasonic bath, and a dental adhesive was applied and light cured for 20 s...
November 17, 2017: Journal of Adhesive Dentistry
https://www.readbyqxmd.com/read/29144007/analysis-of-surface-roughness-fracture-toughness-and-weibull-characteristics-of-different-framework-veneer-dental-ceramic-assemblies-after-grinding-polishing-and-glazing
#16
Guillermo Pradíes, Laura Godoy-Ruiz, Mutlu Özcan, Isabel Moreno-Hay, Francisco Martínez-Rus
PURPOSE: To compare the surface roughness and biaxial flexural strength of dental ceramics obtained after chairside surface modification by mechanical polishing procedures, versus laboratory reglazing. MATERIALS AND METHODS: Discs (16 × 1.5 ± 1.6 mm) (N = 90) of various framework-veneering combinations were fabricated: D/FC: lithium disilicate/feldspathic ceramic; Z/AL: zirconium dioxide/aluminous ceramic; N/FC: noble alloy/feldspathic ceramic; N/FF: noble alloy feldspathic with fluorapatite; B/FC: base alloy/feldspathic ceramic; B/FF: base alloy/feldspathic ceramic with fluorapatite...
November 16, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29140971/effect-of-s-mutans-and-s-sanguinis-on-growth-and-adhesion-of-p-gingivalis-and-their-ability-to-adhere-to-different-dental-materials
#17
Yan Tu, Xiaolong Ling, Yadong Chen, Yuan Wang, Na Zhou, Hui Chen
BACKGROUND Caries and periodontal diseases are caused by the biofilm formed by caries- and periodontal disease-related bacteria. Specific biofilms could be formed on different filling materials in oral cavity. Thus, to explore the inhibition effect of restorative filling materials on biofilm formation is of great significance in the treatment of caries and periodontal disease. MATERIAL AND METHODS The supernatants of S. mutans, S. sanguinis, and P. gingivalis suspension were combined with BHI broth. After 24 h, the live P...
November 15, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/29140378/perception-by-osseointegrated-dental-implants-supporting-a-fixed-prosthesis-a-prospective-study
#18
Purva V Bakshi, Srinath Thakur, Sudhindra Kulkarni
PURPOSE: Osseointegrated implants have been shown to transmit a certain sensibility termed as osseoperception. The purpose of this study was to determine the perception by implants over a period of 6 months after loading in comparison to the natural dentition. MATERIALS AND METHODS: Twenty subjects (ages 40 to 50 years) were included in this split-mouth clinical trial. The subjects were divided into two groups (n = 10) as follows: group 1-subjects with recently cemented implant-supported fixed prosthesis opposing natural teeth; group 2-subjects with recently cemented implant-supported fixed prosthesis in both arches...
November 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/29138601/zinc-phosphate-as-a-definitive-cement-for-implant-supported-crowns-and-fixed-dentures
#19
Dennis Flanagan
Implant-supported dental prostheses can be retained by a screw or cement. Implant-supported fixed partial dentures have a passive fit. A passive fit means there is an internal gap between the abutment surface and the intaglio of the retainer to insure that there is no lateral pressure on the supporting implants or friction upon seating of the prosthesis. This gap is filled with cement for retention of the prosthesis. Any lateral pressure may cause marginal bone loss or periimplantitis. Also, there is usually a microscopic gap at the margin of a crown retainer that exposes the cement to oral fluids...
2017: Clinical, Cosmetic and Investigational Dentistry
https://www.readbyqxmd.com/read/29128350/biomechanical-behavior-of-adhesive-cement-layer-and-periodontal-tissues-on-the-restored-teeth-with-zirconia-rbfdps-using-three-kinds-of-framework-design-3d-fea-study
#20
Ayana Uraba, Reina Nemoto, Kosuke Nozaki, Tasuku Inagaki, Satoshi Omori, Hiroyuki Miura
PURPOSE: To investigate stress and strain concentrations on resin-bonded fixed dental prostheses (RBFDPs) frameworks of different design using finite element analysis. METHODS: A human dry skull was scanned and models were produced using three-dimensional printer. After abutment preparation, three frameworks, including a three-unit RBFDP, and two-unit cantilevered RBFDPs using #21 and #23 for the abutment tooth, were fabricated. Scanned data were subtracted to define boundary of each structure...
November 8, 2017: Journal of Prosthodontic Research
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