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Artículos de revistas sobre el tema "Dental resins Testing"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 20 de febrero de 2023

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1

Silva, António Sérgio, Aurora Carvalho, Pedro Barreiros, Juliana de Sá, Carlos Aroso, and José Manuel Mendes. "Comparison of Fracture Resistance in Thermal and Self-Curing Acrylic Resins—An In Vitro Study." Polymers 13, no. 8 (April 11, 2021): 1234. http://dx.doi.org/10.3390/polym13081234.

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Thermal and self-curing acrylic resins are frequently and versatilely used in dental medicine since they are biocompatible, have no flavor or odor, have satisfactory thermal qualities and polishing capacity, and are easy and fast. Thus, given their widespread use, their fracture resistance behavior is especially important. In this research work, we comparatively analyzed the fracture resistance capacity of thermo and self-curing acrylic resins in vitro. Materials and Methods: Five prosthesis bases were created for each of the following acrylic resins: Lucitone®, ProBase®, and Megacryl®, which

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2

Arif, Wafa, Nosheen Fatima Rana, Iqra Saleem, Tahreem Tanweer, Muhammad Jawad Khan, Sohad Abdulkaleg Alshareef, Huda M. Sheikh, et al. "Antibacterial Activity of Dental Composite with Ciprofloxacin Loaded Silver Nanoparticles." Molecules 27, no. 21 (October 24, 2022): 7182. http://dx.doi.org/10.3390/molecules27217182.

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Resin composites have been widely used in dental restoration. However, polymerization shrinkage and resultant bacterial microleakage are major limitations that may lead to secondary caries. To overcome this, a new type of antibacterial resin composite containing ciprofloxacin-loaded silver nanoparticles (CIP-AgNPs) were synthesized. The chemical reduction approach successfully produced CIP-AgNPs, as demonstrated by FTIR, zeta potential, scanning electron microscopy, and ultraviolet-visible (UV-vis) spectroscopy. CIP-AgNPs were added to resin composites and the antibacterial activity of the den

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3

Encalada-Alayola, J. J., Y. Veranes-Pantoja, J. A. Uribe-Calderón, J. V. Cauich-Rodríguez, and J. M. Cervantes-Uc. "Effect of Type and Concentration of Nanoclay on the Mechanical and Physicochemical Properties of Bis-GMA/TTEGDMA Dental Resins." Polymers 12, no. 3 (March 6, 2020): 601. http://dx.doi.org/10.3390/polym12030601.

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Bis-GMA/TTEGDMA-based resin composites were prepared with two different types of nanoclays: an organically modified laminar clay (Cloisite® 30B, montmorillonite, MMT) and a microfibrous clay (palygorskite, PLG). Their physicochemical and mechanical properties were then determined. Both MMT and PLG nanoclays were added into monomer mixture (1:1 ratio) at different loading levels (0, 2, 4, 6, 8 and 10 wt.%), and the resulting composites were characterized by scanning electron microscopy (SEM), thermogravimetric analysis (TGA), dynamic mechanical analysis (DMA) and mechanical testing (bending and

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4

Hampe, Tristan, Andreas Wiessner, Holm Frauendorf, Mohammad Alhussein, Petr Karlovsky, Ralf Bürgers, and Sebastian Krohn. "Monomer Release from Dental Resins: The Current Status on Study Setup, Detection and Quantification for In Vitro Testing." Polymers 14, no. 9 (April 27, 2022): 1790. http://dx.doi.org/10.3390/polym14091790.

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Improvements in mechanical properties and a shift of focus towards esthetic dentistry led to the application of dental resins in various areas of dentistry. However, dental resins are not inert in the oral environment and may release monomers and other substances such as Bisphenol-A (BPA) due to incomplete polymerization and intraoral degradation. Current research shows that various monomers present cytotoxic, genotoxic, proinflammatory, and even mutagenic effects. Of these eluting substances, the elution of BPA in the oral environment is of particular interest due to its role as an endocrine

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5

Kostic, Milena, Nebojsa Krunic, Ljubisa Nikolic, Vesna Nikolic, Stevo Najman, Ivan Kostic, Jelena Rajkovic, Miodrag Manic, and Dusan Petkovic. "Testing of residual monomer content reduction possibility on acrilic resins quality." Chemical Industry 65, no. 2 (2011): 171–77. http://dx.doi.org/10.2298/hemind101103008k.

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Poly (methyl methacrylate) (PMMA) is material widely used in dentistry. Despite the various methods used to initiate the polymerization of acrylic resins, the conversion of monomer to polymer is not complete thus leaving some unreacted methyl methacrylate (MMA), known as residual monomer (RM), in denture structure. RM in dental acrylic resins has deleterious effects on their mechanical properties and their biocompatibility. The objective of the work was to test the residual monomer reduction possibility by applying the appropriate postpolymerization treatment as well as to determine the effect

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Widyasrini, Dyah Anindya, and Siti Sunarintyas. "Effects of alkalisation and volume fraction reinforcement of Bombyx mori silk fibre on the flexural strength of dental composite resins." Dental Journal (Majalah Kedokteran Gigi) 53, no. 2 (June 15, 2020): 57. http://dx.doi.org/10.20473/j.djmkg.v53.i2.p57-61.

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Background: Composite resins are widely used in dentistry to restore dental caries. Recently, short fibre-reinforced composite (FRC) resins have been widely used for high-stress areas, especially in posterior teeth. Bombyx mori silk fibre is under research to reinforce dental composite resin as it has good mechanical properties. Purpose: This study aims to obtain the effects of alkalisation and silk fibre volume fraction on the flexural strength of FRC. Methods: Bombyx mori silk fibres were obtained from Perhutani, Pati, Indonesia. Samples were divided into two alkalisation groups (4% and 8%).

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7

Blazic, Larisa, Slavoljub Zivkovic, Dejan Pantelic, and Vladimir Pipic. "Polymerization quality testing of composite resins cured by led light source." Serbian Dental Journal 50, no. 1 (2003): 7–12. http://dx.doi.org/10.2298/sgs0301007b.

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The quality of interface between composite resin materials and hard dental tissues is highly dependent on the polymerization light source. Newly developed blue light- emitting diode units for light polymerization of dental restorative materials are the most innovative light source technology in dentistry nowadays. The aim of this work was to estimate the depth of cure of five different light-activating composite resins exposed to different irradiation times (5s, 10s, 20s and 40s) when the experimental LED light source was used. The tested materials were: Tetric Ceram (Vivadent), Point 4 (Kerr)

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8

Watanabe, Satoru, Yoshiki Ishida, Daisuke Miura, Taira Miyasaka, and Akikazu Shinya. "Development of a Weight-Drop Impact Testing Method for Dental Applications." Polymers 12, no. 12 (November 26, 2020): 2803. http://dx.doi.org/10.3390/polym12122803.

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For evaluating the impact strength of dental materials, the Izod test or Charpy test has been used, but specimen preparation for these tests is difficult due to the adjustment of a notch on them. By contrast, a weight-drop impact test does not require notched specimens. Therefore, it might be possible to measure the impact strength more accurately than conventional methods. This study aimed to establish appropriate conditions for applying the weight-drop impact test on small specimens of acrylic resin. To determine the most reliable impact fracture energy of acrylic resins, different diameters

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9

Visco, Anna Maria, L. Calabrese, Nino Campo, A. Bonavita, and Lorenzo Torrisi. "Pull-Out Strength Analysis of Quartz Fibre Posts in Dental Implants." Advances in Science and Technology 49 (October 2006): 130–35. http://dx.doi.org/10.4028/www.scientific.net/ast.49.130.

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In order to rebuild the decayed teeth it’s necessary to re-establish the elastic properties of lost dental tissues, replacing them with restorative materials. A not corrected reconstructive method in the dental implant could reduce the mechanical performance causing its progressive premature failure. In this work composite materials, based on quartz fibers posts and adhesive resins, were employed with the aim to restore damaged teeth. Two groups of extracted teeth were rebuilt with two different techniques. In the first group of samples (A) the fiber quartz post and the adhesive resins were si

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10

Szczesio-Wlodarczyk, Agata, Jerzy Sokolowski, Joanna Kleczewska, and Kinga Bociong. "Ageing of Dental Composites Based on Methacrylate Resins—A Critical Review of the Causes and Method of Assessment." Polymers 12, no. 4 (April 10, 2020): 882. http://dx.doi.org/10.3390/polym12040882.

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The paper reviews the environmental factors affecting ageing processes, and the degradation of resins, filler, and the filler-matrix interface. It discusses the current methods of testing materials in vitro. A review of literature was conducted with the main sources being PubMed. ScienceDirect, Mendeley, and Google Scholar were used as other resources. Studies were selected based on relevance, with a preference given to recent research. The ageing process is an inherent element of the use of resin composites in the oral environment, which is very complex and changes dynamically. The hydrolysis

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11

Pantea, Mihaela, Robert Cătălin Ciocoiu, Maria Greabu, Alexandra Ripszky Totan, Marina Imre, Ana Maria Cristina Țâncu, Ruxandra Sfeatcu, Tudor Claudiu Spînu, Radu Ilinca, and Alexandru Eugen Petre. "Compressive and Flexural Strength of 3D-Printed and Conventional Resins Designated for Interim Fixed Dental Prostheses: An In Vitro Comparison." Materials 15, no. 9 (April 23, 2022): 3075. http://dx.doi.org/10.3390/ma15093075.

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A provisionalization sequence is essential for obtaining a predictable final prosthetic outcome. An assessment of the mechanical behavior of interim prosthetic materials could orient clinicians towards selecting an appropriate material for each clinical case. The aim of this study was to comparatively evaluate the mechanical behavior—with compressive and three-point flexural tests—of certain 3D-printed and conventional resins used to obtain interim fixed dental prostheses. Four interim resin materials were investigated: two 3D-printed resins and two conventional resins (an auto-polymerized res

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12

Cameli, Norma, Maria Mariano, Flavia Pigliacelli, Martina Silvestri, and Antonio Cristaudo. "Occupational Methacrylate Allergy in Dental Personnel." Allergies 1, no. 2 (June 7, 2021): 123–27. http://dx.doi.org/10.3390/allergies1020010.

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Purpose of the article: Acrylate and methacrylate (MA) use in the dental industry is widespread, being utilized in dental prostheses and composite resins, dentin bonding materials, and glass ionomers. However, occupational methacrylate allergy in dental personnel is a growing phenomenon. The aims of this retrospective observational study are to evaluate the risk of occupational contact dermatitis following exposure to methacrylates in dental personnel and to identify possible preventive measures. Materials and Methods: A total of 126 subjects exposed to acrylic and methacrylic resins in their

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13

Silva, Gisele Rodrigues da, Isabela Sousa Araújo, Rodrigo Dantas Pereira, Bruno de Castro Ferreira Barreto, Célio Jesus do Prado, Carlos José Soares, and Luís Roberto Marcondes Martins. "Microtensile Bond Strength of Methacrylate and Silorane Resins to Enamel and Dentin." Brazilian Dental Journal 25, no. 4 (2014): 327–31. http://dx.doi.org/10.1590/0103-6440201300009.

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The aim of this study was to evaluate the microtensile bond strength (µTBS) of two substrates (enamel and dentin) considering two study factors: type of composite resin [methacrylate-based (Filtek Supreme) or silorane-based (Filtek LS)] and aging time (24 h or 3 months). Twenty human molars were selected and divided into 2 groups (n=10) considering two dental substrates, enamel or dentin. The enamel and dentin of each tooth was divided into two halves separated by a glass plate. Each tooth was restored using both tested composite resins following the manufacturer's instructions. The samples we

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14

Song, Hyo-Kyung, Kyung-Hyeon Yoo, Seog-Young Yoon, Hee Sam Na, Jin Chung, Woo-Sung Son, Seung-Min Lee, and Yong-Il Kim. "In Vitro Effect of Gallium-Doped Bioactive Glass on Enamel Anti-Demineralization and Bond Strength of Orthodontic Resins." Applied Sciences 9, no. 22 (November 15, 2019): 4918. http://dx.doi.org/10.3390/app9224918.

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White spot lesions (WSL) that occur on teeth after orthodontic appliances have been attached are caused by bacterial demineralization of the enamel surface. This study investigated the anti-demineralization effect of orthodontic resins containing mesoporous bioactive glass nanoparticles (MBN) doped with gallium, which has antibacterial activity, as well as MBN with increased calcium and phosphate contents as these ions can remineralize enamel. Resins (CF, CharmFill Flow, Dentkist, Seoul, South Korea) containing 1%, 3%, and 5% Ga-doped MBN (GaMBN) were characterized using scanning electron micr

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15

Liber-Kneć, Aneta, and Sylwia Łagan. "Surface Testing of Dental Biomaterials—Determination of Contact Angle and Surface Free Energy." Materials 14, no. 11 (May 21, 2021): 2716. http://dx.doi.org/10.3390/ma14112716.

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The key goal of this study was to characterize surface properties of chosen dental materials on the base on the contact angle measurements and surface free energy calculations. Tested materials were incubated in the simulated oral environment and drinks to estimate an influence of conditions similar to those in the oral cavity on wetting and energetic state of the surface. Types of materials were as follows: denture acrylic resins, composite and PET-G dental retainer to compare basic materials used in a prosthetics, restorative dentistry and orthodontics. The sessile drop method was used to me

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16

Bienek, Diane R., Anthony A. Giuseppetti, Stanislav A. Frukhtbeyn, Rochelle D. Hiers, Fernando L. Esteban Florez, Sharukh S. Khajotia, and Drago Skrtic. "Physicochemical, Mechanical, and Antimicrobial Properties of Novel Dental Polymers Containing Quaternary Ammonium and Trimethoxysilyl Functionalities." Journal of Functional Biomaterials 11, no. 1 (December 18, 2019): 1. http://dx.doi.org/10.3390/jfb11010001.

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The aims of this study were to evaluate the physicochemical and mechanical properties, antimicrobial (AM) functionality, and cytotoxic potential of novel dental polymers containing quaternary ammonium and trimethoxysilyl functionalities (e.g., N-(2-(methacryloyloxy)ethyl)-N,N-dimethyl-3-(trimethoxysilyl)propan-1-aminium iodide (AMsil1) and N-(2-(methacryloyloxy)ethyl)-N,N-dimethyl-11-(trimethoxysilyl)undecan-1-aminium bromide (AMsil2)). AMsil1 or AMsil2 were incorporated into light-cured (camphorquinone + ethyl-4-N,N-dimethylamino benzoate) urethane dimethacrylate (UDMA)/polyethylene glycol-ex

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17

Kumar, Gautam VS, Anupama Nigam, Ahmad Naeem, Abhishek Gaur, Kaushik Kumar Pandey, and Abhimanyu Deora. "Reinforcing Heat-cured Poly-methyl-methacrylate Resins using Fibers of Glass, Polyaramid, and Nylon: An in vitro Study." Journal of Contemporary Dental Practice 17, no. 11 (2016): 948–52. http://dx.doi.org/10.5005/jp-journals-10024-1960.

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ABSTRACT Introduction As civilization has progressed, there has been continued refinement of materials available for dental practice. The applications of resins have been extended to increased practical uses in numerous areas of prosthetic and restorative dentistry. Certain significant alterations in the technique of manipulation and nature of the dental product have influenced the range of application in dentistry. The present study was done to measure and compare the fracture strength of heat polymerized poly-methyl-methacrylate (PMMA) resin reinforced with fibers of glass, polyaramid, and n

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Park, Sang E., Maggie Chao, and P. A. Raj. "Mechanical Properties of Surface-Charged Poly(Methyl Methacrylate) as Denture Resins." International Journal of Dentistry 2009 (2009): 1–6. http://dx.doi.org/10.1155/2009/841431.

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The aim of this study was to examine the mechanical properties of a new surface-modified denture resin for its suitability as denture base material. This experimental resin is made by copolymerization of methacrylic acid (MA) to poly(methyl methacrylate) (PMMA) to produce a negative charge. Four experimental groups consisted of Orthodontic Dental Resin (DENTSPLY Caulk) as a control and three groups of modified PMMA (mPMMA) produced at differing ratios of methacrylic acid (5 : 95, 10 : 90, and 20 : 80 MA : MMA). A 3-point flexural test using the Instron Universal Testing Machine (Instron Corp.)

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19

Hiers, Rochelle Denise, Pedro Huebner, Sharukh Soli Khajotia, and Luis Esteban Florez. "Characterization of Experimental Nanoparticulated Dental Adhesive Resins with Long-Term Antibacterial Properties." Nanomaterials 12, no. 21 (October 24, 2022): 3732. http://dx.doi.org/10.3390/nano12213732.

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Experimental adhesives with functional nitrogen-doped titanium dioxide nanoparticles (N_TiO2) have been shown to display improved properties. However, these materials have not been characterized regarding their degree of conversion (DC), biaxial flexure strength (BFS), surface roughness (SR), elastic modulus (EM), and long-term antibacterial functionalities. Experimental adhesives were synthesized by dispersing N_TiO2 (10%, 20%, or 30%, v/v%) into OptiBond Solo Plus (OPTB, Kerr Corp., USA). Unpolymerized adhesives (volume = 50 μL/drop, n = 3/group) were individually placed onto a heated (37 °C

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Stanford, J. W. "Future of Materials and Materials Research." Advances in Dental Research 2, no. 1 (August 1988): 187–92. http://dx.doi.org/10.1177/08959374880020011301.

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The purpose of this paper was to summarize the presentations on porcelain materials, endodontic materials, casting metals, impression materials, armamentarium, amalgam, resins, composites, cements, bonding agents, adhesives, and calcium phosphate materials. Eight series of recommendations for future research are presented and include areas of basic research, animal models, biocompatibility, correlated laboratory and clinical testing procedures, epidemiological studies, workshops and conferences, materials research criteria, and a Dental Research Information Center. These recommendations were s

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Szalewski, Leszek, Dorota Wójcik, Marcin Bogucki, Jacek Szkutnik, and Ingrid Różyło-Kalinowska. "The Influence of Popular Beverages on Mechanical Properties of Composite Resins." Materials 14, no. 11 (June 5, 2021): 3097. http://dx.doi.org/10.3390/ma14113097.

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Currently, composite resins are used in many restorative procedures. Previous studies showed that drinking beverages may affect the mechanical properties such as microhardness or flexural strength of dental composite resins. The aim of the present study was to investigate the influence of common beverages on the mechanical properties of composite resins. Samples of the materials were prepared according to the ISO 4049:2010 standard and producer’s recommendations. The samples were next conditioned in tested fluids: distilled water, sparkling water, Coca-Cola, Red Bull and orange juice for 7 day

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Popescu, Florin Dan, Sanda Mihaela Popescu, Răzvan Mercuţ, and Horia Octavian Manolea. "Proposal for a Short Patch Test Series of Dental Materials for Patients with Suspected Oral Contact Allergy." Key Engineering Materials 695 (May 2016): 65–76. http://dx.doi.org/10.4028/www.scientific.net/kem.695.65.

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The selection of patch test haptens contained in oral rehabilitation materials is not an easy task, therefore baseline series and additional dental series are used for screening and to increase the chance for the detection of patient's contact sensitizations. Moreover, the clinical relevance of positive patch tests must be evaluated. We conducted a biomedical literature search, covering a period of thirty years, using the keywords: contact, allergy, dental, allergens, patch, patients, screening, in order to evaluate many studies including large numbers of patients, tested to various hapten ser

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23

Yang, Song-Yi, and Min-Kyung Kang. "Surface Characterization, Antimicrobial Activity, and Biocompatibility of Autopolymerizing Acrylic Resins Coated with Reynoutria elliptica Extract." Plants 9, no. 10 (September 29, 2020): 1292. http://dx.doi.org/10.3390/plants9101292.

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We conducted surface characterization to assess the biocompatibility and investigate the antimicrobial activity against oral pathogens in autopolymerizing acrylic resins, coated with light-curable coating resin, containing various concentrations of Reynoutria elliptica extract (0, 200, 400, and 600 µg/mL). The R. elliptica extract powder was prepared using a freeze-drying technique. Further, a goniometer and microhardness tester were used to determine the water contact angle, and Vickers hardness, respectively; color measurements were performed on the uncoated and coated acrylic resin disks. T

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Alagha, Ebaa Ibrahim, and Mustafa Ibrahim Alagha. "Microhardness Assessment of Two Nanohybrid Composite Resins with Two Curing Technologies." Open Access Macedonian Journal of Medical Sciences 9, no. D (April 17, 2021): 81–86. http://dx.doi.org/10.3889/oamjms.2021.5868.

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AIM:This study evaluated the influence of two light sources on the microhardness of two recent composite resins. MATERIALS AND METHODS: A total of 120 specimens were prepared and divided into two groups according to the composite resin restoration used (Tetric EvoCeram Bulk fill) and (Universal Nanohybrid Mosaic). Each group was subdivided into four subgroups according to the curing sources used with different curing duration’s laser curing system (SIROLaser) for 10, 15, and 20 s and conventional blue light system (LED) for 20 s. A microhardness testing machine was used to assess the microhard

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Liu, Fang, Cheng Qian, Li Xu, Rongxiu Zhang, Liang Liu, Zhigang Wu, Kai Zhang, Shengkai Liao, and Xiaofei Xie. "Analysis on the Performance of Nano-Composite Resin Dental Restorative Materials." Science of Advanced Materials 13, no. 5 (May 1, 2021): 927–37. http://dx.doi.org/10.1166/sam.2021.3995.

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After long-term use of resin materials for dental repair, plaque is easy to accumulate on the surface to form biofilms, which can cause caries. Although antibacterial agents are applied to oral resins, the antibacterial ability, mechanical performance, and biocompatibility of the material have to be considered. In this study, the cationic polymer NPVP with different lengths of alkyl chain is adopted to modify the carbon–nanodiamond (CND), and hydroxyethyl methacrylate (HEMA) is introduced to reduce the cytotoxicity of the modified particles and improve the compatibility with the resin matrix.

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Kyoizumi, Hideaki, Junji Yamada, Toshimitsu Suzuki, Masafumi Kanehira, Werner J. Finger, and Keiichi Sasaki. "Effects of Toothbrush Hardness on in vitro Wear and Roughness of Composite Resins." Journal of Contemporary Dental Practice 14, no. 6 (2013): 1137–44. http://dx.doi.org/10.5005/jp-journals-10024-1464.

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ABSTRACT Aim To investigate and compare the effects of toothbrushes with different hardness on abrasion and surface roughness of composite resins. Materials and methods Toothbrushes (DENT. EX Slimhead II 33, Lion Dental Products Co. Ltd., Tokyo, Japan) marked as soft, medium and hard, were used to brush 10 beam-shaped specimens of each of three composites resins (Venus [VEN], Venus Diamond [VED] and Venus Pearl [VEP]; HeraeusKulzer) with standardized calcium carbonate slurry in a multistation testing machine (2N load, 60 Hz). After each of five cycles with 10k brushing strokes the wear depth a

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Ramburrun, Poornima, Nadine A. Pringle, Admire Dube, Razia Z. Adam, Sarah D’Souza, and Marique Aucamp. "Recent Advances in the Development of Antimicrobial and Antifouling Biocompatible Materials for Dental Applications." Materials 14, no. 12 (June 9, 2021): 3167. http://dx.doi.org/10.3390/ma14123167.

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The risk of secondary bacterial infections resulting from dental procedures has driven the design of antimicrobial and antifouling dental materials to curb pathogenic microbial growth, biofilm formation and subsequent oral and dental diseases. Studies have investigated approaches based primarily on contact-killing or release-killing materials. These materials are designed for addition into dental resins, adhesives and fillings or as immobilized coatings on tooth surfaces, titanium implants and dental prosthetics. This review discusses the recent developments in the different classes of biomate

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Siejka-Kulczyk, Joanna, Joanna Mystkowska, Małgorzata Lewandowska, Jan R. Dabrowski, and Krzysztof Jan Kurzydlowski. "The Influence of Nano-Silica on the Wear Resistance of Ceramic – Polymer Composites Intended for Dental Fillings." Solid State Phenomena 151 (April 2009): 135–38. http://dx.doi.org/10.4028/www.scientific.net/ssp.151.135.

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Ceramic – polymer composites based on acrylic (bis–GMA) and urethane – methacrylate (UM) resins with a 60 % total volume fraction of filler consisting of micro particles of glass and nano-particles of silica were fabricated. The nano-silica contents were: 0, 10, 20 vol. %. The composite samples were subjected to wear tests using an occlusion simulator tester which applies reciprocating movement and cyclic loading on the test material. This method of testing provides some similarity to the masticatory pattern occurring in the mouth during eating. The enamel of a human tooth was used as a counte

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Mikov, Ivan, Ivan Turkalj, and Marina Jovanovic. "Occupational contact allergic dermatitis in dentistry." Vojnosanitetski pregled 68, no. 6 (2011): 523–25. http://dx.doi.org/10.2298/vsp1106523m.

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Introduction. Dental professionals may be at increased risk of developing occupational allergic diseases specially to methacrylates that can permeate protective disposable gloves. Case report. We presented a case of occupational allergic contact dermatitis in a 28-year-old dental technician. The patient had complained of itching and cracking of fingers for 6 months. The dermatitis improved over weekends. Skin erythema and scaling were present with primarily involvement of the fingertips. Patch testing with dental series gave positive vesicular reaction to methyl methacrylate. Follow-up after 6

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Derban, Paula, Romeo Negrea, Mihai Rominu, and Liviu Marsavina. "Influence of the Printing Angle and Load Direction on Flexure Strength in 3D Printed Materials for Provisional Dental Restorations." Materials 14, no. 12 (June 18, 2021): 3376. http://dx.doi.org/10.3390/ma14123376.

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The CAD/CAM techniques, especially additive manufacturing such as 3D printing, constitute an ever-growing part of obtaining different dental appliances and restorations. Of these, provisional restorations are of frequent use in daily dental practice and are the object of this study. Masticatory and parafunctional forces determine flexure on these prostheses. This study investigates the influence of the printing angle and loading direction of the applied force on the flexure strength of two commercially available printable resins—Detax Freeprint Temp and Nextdent MFH Vertex dental. Ten rectangu

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Jassé, Fernanda Ferreira Albuquerque, Cristiane de Melo Alencar, Natália Fernandes Pollo, Cecy Martins Silva, and Edson Alves de Campos. "Molars Fracture Resistance with Class II Cavities Restored with Different Resin - Based Materials." Journal of Health Sciences 23, no. 1 (March 18, 2021): 25–29. http://dx.doi.org/10.17921/2447-8938.2021v23n1p25-29.

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AbstractThe teeth weakening due to the preparation of class II mesio-occluso-distal cavities is a challenge for the clinician. The objective of this study was to evaluate the molars fracture resistance with class II mesio-occluso-distal cavities restored with different restorative techniques and materials. Forty extracted molars were divided into 5 groups: Group 1 – intact healthy teeth (positive control); Group 2 – unrestored teeth with mesio-occluso-distal class II cavities (negative control); Groups 3 to 5 – restored teeth with standardized dimensions. In groups 3 to 5, the cavities were re

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Sinniah, SD, SP Jones, G. Georgiou, SJ Cunningham, and A. Petrie. "Bond Strengths of Composite Resins used for the Attachment of Bonded Retainers." Compendium of Oral Science 3, no. 1 (September 1, 2016): 17–24. http://dx.doi.org/10.24191/cos.v3i0.17515.

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Objectives: To compare the bond strengths and survival of flowable and non -flowable composite resins used with bonded retainers. Setting: Department of Orthodontics, UCL Eastman Dental Institute, United Kingdom. Methods: Flowable composite resins (TransbondTM Supreme LV, StarFlowTM and Tetric EvoFlow®) and non-flowable control resin (TransbondTM LR) were made into cylinders prior to bonding to hydoxyapatite discs. They were then mounted into jigs and tested in the InstronTM Universal Testing Machine in both shear and tensile modes. Results: The highest mean shear bond strength was seen with S

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Emami, N., and KJ Söderholm. "Young's Modulus and Degree of Conversion of Different Combination of Light-Cure Dental Resins." Open Dentistry Journal 3, no. 1 (October 1, 2009): 202–7. http://dx.doi.org/10.2174/1874210600903010202.

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Objectives: To evaluate Young's modulus and degree of conversion of several combinations of bisGMA, UEDMA, TEGDMA light-cure dental resin. Methods: Young's modulus and DC% were studied for 21 different resin combinations of bisGMA, TEGDMA and UEDMA. Small universal testing machine and photo-calorimetry were used for the tests. The results were evaluated using ANOVA and Duncan's multiple range tests and regular t-test. Results: Young's modulus varied between 2.37±0.2 GPa (100% TEGDMA) and 4.15±0.2 GPa (100% bisGMA). By adding TEGDMA to bisGMA or UEDMA, the Young's modulus decreased significantl

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Khalesi, Rayhaneh, Mahdi Abbasi, Zahra Shahidi, Masoumeh Hasani Tabatabaei, and Zohreh Moradi. "Interfacial Fracture Toughness Comparison of Three Indirect Resin Composites to Dentin and Polyether Ether Ketone Polymer." European Journal of Dentistry 14, no. 03 (July 2020): 456–61. http://dx.doi.org/10.1055/s-0040-1713309.

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Abstract Objectives Advances in laboratory composites and their high wear resistance and fracture toughness have resulted in their growing popularity and increasing use for dental restorations. This study sought to assess the fracture toughness of three indirect composites bonded to dental substrate and polyether ether ketone (PEEK) polymer. Materials and Methods This in vitro study was conducted on two groups of dental and polymer substrates. Each substrate was bonded to three indirect composite resins. Sixty blocks (3 × 3 × 12 mm) were made of sound bovine anterior teeth and PEEK polymer. Si

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Sá, Juliana de, Francisca Vieira, Carlos Manuel Aroso, Mónica Cardoso, José Manuel Mendes, and António Sérgio Silva. "The Influence of Saliva pH on the Fracture Resistance of Three Complete Denture Base Acrylic Resins." International Journal of Dentistry 2020 (November 1, 2020): 1–12. http://dx.doi.org/10.1155/2020/8941876.

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Aim and Background. The absorption of fluids by denture base materials diminishes the mechanical properties such as hardness, strength, and fatigue limit due to the plasticizing effect of water. This study aimed to evaluate the influence of oral pH on the fracture resistance of prosthetic bases made of three different heat-polymerizable acrylic resin brands: RS Vertex®, Triplex Hot®, and Megacryl®. The strength needed to fracture the resins and the resistance to fracture each resin were evaluated. Methods. Ten prosthesis bases prepared with each brand of resin were subjected to neutral and low

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de Jesus, Ricardo Huver, Pâmela Rodrigues Pires, Raquel Cavallini Silva, Suyanni Chieppe dos Santos Manfioletti, Carlos Frederico Bettcher Silva, and Lucas Campagnaro Maciel. "Resistência à compressão de compósitos de preenchimento único." Full Dentistry in Science 12, no. 46 (2021): 118–23. http://dx.doi.org/10.24077/2021;1246-118123.

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A new class of composite resins called single fill resins (Bulk-Fill) was proposed to simplify restorative procedures. They allow filling dental cavities in layers of approximately 4mm. This study aims to compare the compression strength of single fill composites with different polymerization times. Four Bulk-Fill composites were used Filtek Bulk-Fill, Filtek Bulk-Fill Flow, Tetric N-Ceram Bulk-Fill, and Tetric N-Flow Bulk-Fill, and also a conventional composite Filtek Z350 XT as a control group. One hundred cylinders were manufactured in a matrix with 4.7mm diameter and 4mm height for Bulk-Fi

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Monteiro, Jaiane Bandoli, Ricardo Toledo Abreu, Lívia Salgado, Thais Cachuté Paradella, Ivone De Oliveira Salgado, and Renato Cilli. "Effect of shear bond strength of metallic orthodontic brackets bonded with and without dental adhesive." Brazilian Dental Science 21, no. 4 (October 24, 2018): 395. http://dx.doi.org/10.14295/bds.2018.v21i4.1597.

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<p><strong>Objective</strong>: The aim of this study was to evaluate the shear bond strength (SBS) of two materials for bonding orthodontic brackets on dental enamel before and after thermocycling. <strong>Material and Methods: </strong>Forty bovine incisors were divided into four groups (n=10). All teeth were etched with 35% phosphoric acid (3M Espe). For bonding of the brackets, G1 and G2 received orthodontic composite resin (Fill Magic Ortodôntico) and G3 and G4, an adhesive (ScotchBond) was used before the orthodontic resin Transbond XT (3M Unitek). G1 and G3

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Kati, Firas Abd. "Effects of chemical disinfectants on surface hardness of heat -cured acrylic resins. In vitro study." Journal of Oral Research 10, no. 6 (December 31, 2021): 1–6. http://dx.doi.org/10.17126/joralres.2021.074.

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Introduction: Acrylic resins (i.e., heat cured acrylic resins) are the most common materials used to manufacture removable dental prostheses involving maxillofacial prostheses such as obturators. Their mechanical and physical properties must be adequate for their use and durability. It is therefore vital to assess how their properties are affected by different disinfectants. Aims: The purpose of this research was to evaluate the effect of chemical disinfectants on surface hardness of the acrylic resins. Material and Methods: Forty specimens (65 mm in length, 10 mm in width and 2.5 mm thick) we

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Valizadeh, Sara, Elham Farhadi, Aida Moradi, and Sedighe S. Hashemikamangar. "Evaluation of the Effect of Cold Plasma Treatment on the Microshear Bond Strength of Composite Resin Restorations to Dentin using Different Adhesive Systems and the Effect of Thermocycling." Open Dentistry Journal 15, no. 1 (December 31, 2021): 734–41. http://dx.doi.org/10.2174/1874210602115010734.

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Introduction: Currently, non-thermal plasma is used to modify the enamel and dentin surfaces to improve the bonding surface to dental composite resins. Non-thermal plasma creates a hydrophilic surface, decreases the contact angle, and improves the bonding quality. The present study aimed to evaluate the microshear bond strength (µSBS) of composite resins to dentin using different adhesive systems. Materials and Methods: Bovine incisor teeth were randomly assigned to three groups of G-Premio, Clearfil SE Bond, and Adper Single Bond adhesive groups after preparation. Each group was divided into

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Sahebalam, Rasoul, Alireza Boruziniat, Fahimeh Mohammadzadeh, and Abdolrasoul Rangrazi. "Effect of the Time of Salivary Contamination during Light Curing on Degree of Conversion and Microhardness of a Restorative Composite Resin." Biomimetics 3, no. 3 (August 22, 2018): 23. http://dx.doi.org/10.3390/biomimetics3030023.

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Saliva contamination is a major clinical problem in restorative procedures. The purpose of this study was to evaluate the effect of the time of salivary contamination during light curing on the degree of conversion and the microhardness of a restorative composite resin. Eight groups of 10 samples for measuring the microhardness and eight groups of 5 samples for evaluating the degree of conversion were prepared. The samples of each group were contaminated with human saliva at a certain time. The first group (T0) was contaminated before light curing. The specimens in groups T2–T30 were contamina

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Scaminaci Russo, Daniele, Francesca Cinelli, Chiara Sarti, and Luca Giachetti. "Adhesion to Zirconia: A Systematic Review of Current Conditioning Methods and Bonding Materials." Dentistry Journal 7, no. 3 (August 1, 2019): 74. http://dx.doi.org/10.3390/dj7030074.

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Background. Reliable bonding between resin composite cements and high strength ceramics is difficult to achieve because of their chemical inertness and lack of silica content that makes etching impossible. The purpose of this review is to classify and analyze the existing methods and materials suggested to improve the adhesion of zirconia to dental substrate by using composite resins, in order to explore current trends in surface conditioning methods with predictable results. Methods. The current literature, examining the bond strength of zirconia ceramics, and including in vitro studies, clin

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Sodagar, Ahmad, Mohamad Sadegh Ahmad Akhoundi, Abbas Bahador, Yasamin Farajzadeh Jalali, Zahra Behzadi, Farideh Elhaminejad, and Amir Hossein Mirhashemi. "Effect of TiO2 nanoparticles incorporation on antibacterial properties and shear bond strength of dental composite used in Orthodontics." Dental Press Journal of Orthodontics 22, no. 5 (October 2017): 67–74. http://dx.doi.org/10.1590/2177-6709.22.5.067-074.oar.

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ABSTRACT Introduction: Plaque accumulation and bond failure are drawbacks of orthodontic treatment, which requires composite for bonding of brackets. As the antimicrobial properties of TiO2 nanoparticles (NPs) have been proven, the aim of this study was to evaluate the antimicrobial and mechanical properties of composite resins modified by the addition of TiO2 NPs. Methods: Orthodontics composite containing 0%, 1%, 5% and 10% NPs were prepared. 180 composite disks were prepared for elution test, disk agar diffusion test and biofilm inhibition test to collect the counts of microorganisms on thr

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Morita, Aryan, H. Dedy Kusuma Yulianto, Susmira Delta Kusdina, and Nunuk Purwanti. "Differences of Streptococcus mutans adhesion between artificial mouth systems: a dinamic and static methods." Dental Journal (Majalah Kedokteran Gigi) 49, no. 2 (February 14, 2017): 67. http://dx.doi.org/10.20473/j.djmkg.v49.i2.p67-70.

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Background: Various materials have been used for treating dental caries. Dental caries is a disease that attacks hard tissues of the teeth. The initial phase of caries is a formation of bacterial biofilm, called as dental plaque. Dental restorative materials are expected for preventing secondary caries formation initiated by dental plaque. Initial bacterial adhesion is assumed to be an important stage of dental plaque formation. Bacteria that recognize the receptor for binding to the pellicle on tooth surface are known as initial bacterial colonies. One of the bacteria that plays a role in the

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Mada, Diana Carla, Cristina Gasparik, Alexandra Iulia Irimie, Marius Dan Mada, Diana Dudea, and Radu Septimiu Campian. "Evaluation of chromatic changes of a nanocomposite resin using the new whiteness index." Medicine and Pharmacy Reports 91, no. 2 (April 26, 2018): 222–28. http://dx.doi.org/10.15386/cjmed-893.

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Background and aims. To evaluate the staining effects of two brands of coffee and the bleaching efficiency of two in-office bleaching methods, upon different opacities of a commercial nanocomposite.Methods. Twenty four specimens of each opacity, A3 Dentin, A3 Body and A3 Enamel, were fabricated from Filtek Supreme (3MEspe). The specimens were further divided into two groups (n=12) and were immersed in two coffee solutions (Bio Organic Coffee Bellarom, 100% Arabica, and Iulius Meinl Coffee), for 24 hours. Between the staining sessions, the specimens were stored in sterile water, at 37°C. Each g

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Bilgrami, Afreen, Afsheen Maqsood, Mohammad Khursheed Alam, Naseer Ahmed, Mohammed Mustafa, Ali Robaian Alqahtani, Abdullah Alshehri, Abdullah Ali Alqahtani, and Shahad Alghannam. "Evaluation of Shear Bond Strength between Resin Composites and Conventional Glass Ionomer Cement in Class II Restorative Technique—An In Vitro Study." Materials 15, no. 12 (June 17, 2022): 4293. http://dx.doi.org/10.3390/ma15124293.

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The success of dental restorations depends mainly on the ability to bond to other filling materials and tooth substances, in order to resist the multitude of forces acting on the bond within the oral cavity. Although the shortcomings of composite resins have been significantly reduced over the past three decades, microleakage due to shrinkage under masticatory loads is unavoidable. In order to overcome such problems, two materials laminated with matched properties can be used to achieve optimum results. The sandwich technique is an approach in which dentine is replaced by glass ionomer cement

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Consani, Rafael Leonardo Xediek, Tatiane Marinho, Atais Bacchi, Ricardo Armini Caldas, Victor Pinheiro Feitosa, and Carmem Silvia Pfeifer. "Repair Strength in Simulated Restorations of Methacrylate- or Silorane-Based Composite Resins." Brazilian Dental Journal 27, no. 4 (August 2016): 463–67. http://dx.doi.org/10.1590/0103-6440201600730.

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Abstract The study verified the bond strength in simulated dental restorations of silorane- or methacrylate-based composites repaired with methacrylate-based composite. Methacrylate- (P60) or silorane-based (P90) composites were used associated with adhesive (Adper Single Bond 2). Twenty-four hemi-hourglass-shaped samples were repaired with each composite (n=12). Samples were divided according to groups: G1= P60 + Adper Single Bond 2+ P60; G2= P60 + Adper Single Bond 2 + P60 + thermocycling; G3= P90 + Adper Single Bond 2 + P60; and G4= P90 + Adper Single Bond 2 + P60 + thermocycling. G1 and G3

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Tanjung, Steven, Rudy Djuanda, and Angela Evelyna. "Perbedaan Kekuatan Geser Perlekatan (Shear Bond Strength) Antara Self – Adhering Flowable Composite dan Flowable Composite dengan Sistem Adhesif Self – Etch pada Dentin." SONDE (Sound of Dentistry) 4, no. 1 (July 4, 2019): 16–25. http://dx.doi.org/10.28932/sod.v4i1.1767.

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Restoration is a treatment to restore the structure of missing dental hard tissue due to caries. Flowable composite has good adaptability to the cavity wall so that it is widely used as an intermediate layer. Composite resins require an adhesive system to bond chemically with dental hard tissue. Self - adhering flowable composite combining etching, priming, and adhesive in one flowable package. This study was conducted with the aim to determine the difference in shear bond strength between Self – adhering flowable composite and flowable composite with self – etch adhesive system on dentine. Th

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Darzé, Fernanda Medeiros, Flávia Lucisano Botelho do Amaral, Fabiana Mantovani Gomes França, Cecília Pedroso Turssi, and Roberta Tarkany Basting. "Effect of 10% sodium bicarbonate on bond strength of enamel and dentin after bleaching with 38% hydrogen peroxide." Revista de Odontologia da UNESP 44, no. 5 (October 6, 2015): 257–61. http://dx.doi.org/10.1590/1807-2577.1073.

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AbstractIntroductionBy-products of hydrogen peroxide degradation released during dental bleaching influence the polymerization of adhesive systems and composite resins, causing a reduction in shear bond strength to the tooth.Objectivethe aim of this article was to evaluate the effect of 10% sodium bicarbonate (SB), applied for different lengths of time, on the shear bond strength to enamel and dentin after bleaching.Material and methodEnamel and dentin blocks were divided into groups (n=10): (1) control: no bleaching; (2) immediate: bleaching immediately followed by restoration; (3) 14-day: bl

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Ranganath, LM, Ajay Gaikwad, Saket K. Jain, and Kapil S. Pal. "Evaluation of Flexural Strength of Polymethyl Methacrylate modified with Silver Colloidal Nanoparticles subjected to Two Different Curing Cycles: An in vitro Study." Journal of Contemporary Dental Practice 19, no. 3 (2018): 262–68. http://dx.doi.org/10.5005/jp-journals-10024-2249.

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ABSTRACT Aim Silver colloidal nanoparticles have been incorporated into acrylic resins to induce antimicrobial properties. However, as additives, they can influence the mechanical properties of the final product. Mechanical properties are also dependent on different curing cycles. The aim of this study was to evaluate flexural strength of a denture base resin incorporated with different concentrations of silver colloidal nanoparticles subjected to two different curing cycles. Materials and methods Lucitone 199 denture base resin was used into which silver colloidal nanoparticles were incorpora

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Malara, P., A. Pasieka, K. Paluch, and K. Sobolewska. "Assesment of the binding strength of selected bonding systems used for cementation of implantoprosthetic suprastructures." Journal of Achievements in Materials and Manufacturing Engineering 1, no. 80 (January 2, 2017): 18–24. http://dx.doi.org/10.5604/01.3001.0010.1443.

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Purpose: of this paper is the assessment of the strength of binding of selected bondingsystems used for fixing prosthetic works. The characteristics of cement materials used forsettling the crowns on the implant abutments were also included. The study has presentedthe evaluation of the binding strength of selected bonding systems used for fixed prostheticworks.Design/methodology/approach: Metal substructures of single-unit cement-retainedcrown were designed and manufactured using CAD/CAM technology. Created wax modelswere changed to metal substructures and settled on the abutments attached to

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