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Dental Materials Journal

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https://www.readbyqxmd.com/read/28450675/the-effect-of-heat-treatments-applied-to-superstructure-porcelain-on-the-mechanical-properties-and-microstructure-of-lithium-disilicate-glass-ceramics
#1
Hatice Özdemir, Alper Özdoğan
The aim of this study was to investigate that heat treatments with different numbers applied to superstructure porcelain whether effects microstructure and mechanical properties of lithium disilicate ceramic (LDC). Eighty disc-shaped specimens were fabricated from IPS e.max Press. Specimens were fired at heating values of porcelain in different numbers and divided four groups (n=5). Initial Vickers hardness were measured and X-ray diffraction (XRD) analysis was performed. Different surface treatment were applied and then Vickers hardness, surface roughness and environmental scanning electron microscopy (ESEM) analysis were performed...
April 26, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28450674/effects-of-powder-to-liquid-ratio-on-properties-of-%C3%AE-tricalcium-phosphate-cements-modified-using-high-energy-ball-milling
#2
Yumika Ida, Jiyoung Bae, Kazumitsu Sekine, Fumiaki Kawano, Kenichi Hamada
The authors have developed a β-tricalcium-phosphate (β-TCP) powder modified mechano-chemically through the application of a ball-milling process (mβ-TCP). The resulting powder can be used in a calcium-phosphate-cement (CPC). In this study, the effects of the powder-to-liquid ratio (P/L ratio) on the properties of the CPCs were investigated, and an appropriate P/L ratio that would simultaneously improve injectability and strength was clarified. The mβ-TCP cement mixed at a P/L ratio of 2.5 and set in air exhibited sufficient injectability until 20 min after mixing, and strength similar to or higher than that mixed at a P/L ratio of 2...
April 26, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28450673/effect-of-long-time-immersion-of-soft-denture-liners-in-water-on-viscoelastic-properties
#3
Naohiko Iwasaki, Chisato Yamaki, Hidekazu Takahashi, Meiko Oki, Tetsuya Suzuki
Aim of this study was to investigate the effect of long-time immersion of soft denture liners in 37°C water on viscoelastic properties. Six silicone-based and two acrylic resin-based soft denture liners were selected. Cylindrical specimens were stored in distilled water at 37°C for 6 months. Viscoelastic properties, which were instantaneous and delayed elastic displacements, viscous flow, and residual displacement, were determined using a creep meter, and analyzed with 2-way analysis of variance and Tukey's comparison (α=0...
April 26, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28450672/dose-effects-of-beta-tricalcium-phosphate-nanoparticles-on-biocompatibility-and-bone-conductive-ability-of-three-dimensional-collagen-scaffolds
#4
Shusuke Murakami, Hirofumi Miyaji, Erika Nishida, Kohei Kawamoto, Saori Miyata, Hiroko Takita, Tsukasa Akasaka, Bunshi Fugetsu, Toshihiko Iwanaga, Hiromi Hongo, Norio Amizuka, Tsutomu Sugaya, Masamitsu Kawanami
Three-dimensional collagen scaffolds coated with beta-tricalcium phosphate (β-TCP) nanoparticles reportedly exhibit good bioactivity and biodegradability. Dose effects of β-TCP nanoparticles on biocompatibility and bone forming ability were then examined. Collagen scaffold was applied with 1, 5, 10, and 25 wt% β-TCP nanoparticle dispersion and designated TCP1, TCP5, TCP10, and TCP25, respectively. Compressive strength, calcium ion release and enzyme resistance of scaffolds with β-TCP nanoparticles applied increased with β-TCP dose...
April 26, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28450671/effect-of-cavity-disinfectants-on-antibacterial-activity-and-microtensile-bond-strength-in-class-i-cavity
#5
Bo-Ram Kim, Man-Hwan Oh, Dong-Hoon Shin
This study was performed to compare the antibacterial activities of three cavity disinfectants [chlorhexidine (CHX), NaOCl, urushiol] and to evaluate their effect on the microtensile bond strength of Scotchbond Universal Adhesive (3M-ESPE, St. Paul, MN, USA) in class I cavities. In both experiments, class I cavities were prepared in dentin. After inoculation with Streptococcus mutans, the cavities of control group were rinsed and those of CHX, NaOCl and urushiol groups were treated with each disinfectant. Standardized amounts of dentin chips were collected and number of S...
April 26, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28420834/improving-the-efficacy-of-chlorhexidine-releasing-elastomerics-using-a-layerby-layer-coating-technique
#6
Hyun-Sun Jeon, Eun-Ha Jung, Si-Mook Kang, Eun-Song Lee, Jeong-Woo Lee, Baek-Il Kim
The aims of this study were to identify the optimal concentration of coated orthodontic elastomerics using a layer-by-layer technique that can release chlorhexidine (CHX) as an antimicrobial material, and to measure the physical properties and antimicrobial effects of the coated elastomerics. Ethyl cellulose (EC) was used as the polymer, and five study groups with various combinations of solvents (i.e., ethanol and dichloromethane [DCM]) were included. The coated elastomerics were evaluated with a spectrophotometer to confirm the release of CHX, and their surfaces were observed by SEM...
April 18, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28420833/correlations-among-bending-test-methods-for-dental-hard-resins
#7
Daisuke Miura, Taira Miyasaka, Harumi Aoki, Yusuke Aoyagi, Yoshiki Ishida
Three types of bending tests -the 3-point bending test, 4-point bending test and biaxial flexural test- were performed to examine the correlations among the testing methods for dental hard resins (HRs). The results for 5 HRs showed that the bending strengths in descending order were: biaxial flexural strength>3-point bending strength>4-point bending strength. Regression analysis of the test methods indicated that the coefficients of determination were large for all test methods; the largest was for the combination of the 4-point bending test and biaxial flexural tests...
April 18, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28420832/effect-of-air-particle-pressures-on-the-surface-topography-and-bond-strengths-of-resin-cement-to-the-hybrid-ceramics
#8
Jong-Eun Kim, Jee-Hwan Kim, June-Sung Shim, Byoung-Duck Roh, Yooseok Shin
This study aimed to determine the appropriate pressure for airborne-abrasion by comparing the shear bond strength values for different hybrid ceramic surfaces. Two materials were used to produce hybrid ceramic specimens: Lava Ultimate and MAZIC Duro. The group of specimens whose surfaces were not subjected to airborne-abrasion was set as the control group. In the experimental group, airborne-abrasion was performed at pressures of 0.1, 0.2, and 0.3 MPa. After the adhesive and resin cement was applied, an SBS test was performed...
April 18, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28420831/enamel-microcracks-in-terms-of-orthodontic-treatment-a-novel-method-for-their-detection-and-evaluation
#9
Irma Dumbryte, Laura Linkeviciene, Tomas Linkevicius, Mangirdas Malinauskas
The study aimed at introducing current available techniques for enamel microcracks (EMCs) detection, and presenting a method for direct quantitative analysis of an individual EMC. Measurements of the detailed EMCs characteristics (location, length, and width) were taken from the reconstructed images of the buccal tooth surface (teeth extracted from two age groups of patients) employing a scanning electron microscopy (SEM) and our derived formulas before and after ceramic brackets removal. Measured parameters of EMCs for younger age group were 2...
April 18, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28420830/antimicrobial-and-antibiofilm-activities-of-mta-supplemented-with-bismuth-lipophilic-nanoparticles
#10
Rene Hernandez-Delgadillo, Casiano Del Angel-Mosqueda, Juan Manuel Solís-Soto, Silvia Munguia-Moreno, Nayely Pineda-Aguilar, Rosa Isela Sánchez-Nájera, Shankararaman Chellam, Claudio Cabral-Romero
The objective of this work was to determine the antimicrobial and antibiofilm properties of mineral trioxide aggregate (MTA) supplemented with bismuth lipophilic nanoparticles (BisBAL NPs). The antimicrobial activity of the composite MTA-BisBAL NPs was determined by the disk diffusion assay, while antibiofilm activity was analyzed by fluorescence microscopy. The cytotoxicity of MTA-BisBAL NPs was determined on human gingival fibroblasts by optical microscopy and crystal violet staining. MTA-BisBAL NPs inhibited the growth of Enterococcus faecalis, Escherichia coli, and Candida albicans and also detached the biofilm of fluorescent E...
April 18, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28420829/bonding-measurement-strength-and-fracture-mechanics-approaches
#11
Chuchai Anunmana, Wiroj Wansom
This study investigated the effect of cross-sectional areas on interfacial fracture toughness and bond strength of bilayered dental ceramics. Zirconia core ceramics were veneered and cut to produce specimens with three different cross-sectional areas. Additionally, monolithic specimens of glass veneer were also prepared. The specimens were tested in tension until fracture at the interface and reported as bond strength. Fracture surfaces were observed, and the apparent interfacial toughness was determined from critical crack size and failure stress...
April 18, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28420828/y-tzp-zirconia-regeneration-firing-microstructural-and-crystallographic-changes-after-grinding
#12
Daniel Patrick Obelenis Ryan, Laiza Maria Grassi Fais, Selma Gutierrez Antonio, Gabriel Rodrigues Hatanaka, Lucas Miguel Candido, Ligia Antunes Pereira Pinelli
This study evaluated microstructural and crystallographic phase changes after grinding (G) and regeneration firing/anneling (R) of Y-TZP ceramics. Thirty five bars (Lava(TM) and Ice Zirkon) were divided: Y-TZP pre-sintered, control (C), regeneration firing (R), dry grinding (DG), dry grinding+regeneration firing (DGR), wet grinding (WG) and wet grinding+regeneration firing (WGR). Grinding was conducted using a diamond bur and annealing at 1,000°C. The microstructure was analyzed by SEM and the crystalline phases by X-ray diffraction (XRD)...
April 18, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28367914/plasma-treated-water-eliminates-streptococcus-mutans-in-infected-dentin-model
#13
Tatsuya Tasaki, Tomoko Ohshima, Emi Usui, Satoshi Ikawa, Katsuhisa Kitano, Nobuko Maeda, Yasuko Momoi
Non-mechanical procedures for removing caries-infected dentin are warranted in dentistry. We previously demonstrated the marked sterilization effect for direct irradiation of low-temperature plasma using dentin model infected with Streptococcus mutans. However it requires 180 s of intraoral plasma irradiation to eliminate bacteria. We alternatively investigated whether plasma-treated water (PTW), i.e., pure water exposed to plasma in an atmosphere, has a same bactericidal activity with the plasma irradiation...
March 29, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28367913/impact-of-background-on-color-transmittance-and-fluorescence-of-leucite-based-ceramics
#14
Caroline Freitas Rafael, Jan-Frederik Güth, Ana Elisa Colle Kauling, Paulo Francisco Cesar, Claudia Angelo Mazieiro Volpato, Anja Liebermann
This study evaluated the impact of tooth shade on differences in color (∆E), lightness (∆L), chromaticity coordinates a*/b* (∆a and ∆b), transmittance and the degree of fluorescence of CAD/CAM leucite based ceramic (LBC). Ten disks were fabricated of LBC; Empress CAD, A2, thickness of 1.5 mm and eight disks of resin-nano-ceramic (RNC; Lava Ultimate) in different colors to simulate variations in substrate shade. The associations of LBC disks with different color substrates were analyzed with a spectrophotometer; ∆E, ∆L*, ∆a*, ∆b*, and transmittance were measured and calculated...
March 29, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28367912/the-effects-of-single-application-of-pastes-containing-ion-releasing-particles-on-enamel-demineralization
#15
Masahiro Iijima, Kyotaro Kawaguchi, Naohiko Kawamura, Shuichi Ito, Takashi Saito, Itaru Mizoguchi
We investigated single application of pastes containing a surface reaction-type pre-reacted glass-ionomer (S-PRG) filler on enamel demineralization. Human enamel blocks were polished using pastes containing S-PRG filler (0, 5, and 30%) and immersed in demineralizing solution for 5 days with daily change of solutions. The pH measurement and nanoindentation testing was carried out during the immersion period, and the enamel surfaces were examined using scanning electron microscopy and atomic force microscopy...
March 29, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28367911/sem-evaluation-of-the-precision-of-fit-of-cad-cam-zirconia-and-metal-ceramic-posterior-crowns
#16
Rocio Ortega, Esther Gonzalo, Miguel Gomez-Polo, Carlos Lopez-Suarez, Maria J Suarez
The purpose of this study is to evaluate the precision of fit of posterior crowns made from three commercial CAD/CAM zirconia ceramics and conventional metal-ceramic technique. The external and internal marginal fit of the crowns was evaluated using direct SEM-based measurements. The data were subjected to Kruskal-Wallis, multicomparison post hoc analysis and Wilcoxon rank sum tests (α=0.05). Significant differences were observed for the external (p<0.002) and the internal (p<0.0001) marginal evaluation among the groups...
March 29, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28367910/effects-of-experimental-pastes-containing-surface-pre-reacted-glass-ionomer-fillers-on-inhibition-of-enamel-demineralization
#17
Keiki Nakamura, Hidenori Hamba, Syozi Nakashima, Alireza Sadr, Toru Nikaido, Masakazu Oikawa, Motohiro Uo, Junji Tagami
This study aimed to evaluate the inhibitory effect of experimental pastes containing surface pre-reacted glass ionomer (S-PRG) fillers on enamel demineralization. Bovine blocks were treated twice a day for 4 days by 7 groups; experimental pastes containing 0-30 wt% S-PRG filler (S00, S01, S05, S10, and S30), deionized water (DW) as negative control, and NaF paste (MP) as positive control. The surfaces were demineralized by acetic acid for 3 days. Mineral loss (ML) was calculated by micro-computed X-ray tomography...
March 29, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28367909/bonding-state-of-metal-free-cad-cam-onlay-restoration-after-cyclic-loading-with-and-without-immediate-dentin-sealing
#18
Noriko Ishii, Toshio Maseki, Yoichiro Nara
To examine the bonding state of metal-free CAD/CAM onlay restorations made from two popular resin composite blocks and a typical glass-ceramic block after cyclic loading, with and without immediate dentin sealing (IDS). Standardized mesial-distal-occlusalbuccal (MODB) cavities in 24 extracted human molars were prepared. The intra-cavity dentin surfaces of half of the cavities were immediately sealed with all-in-one adhesive and flowable composite, while those of the other half were not. All cavities were scanned, from which CAD/CAM onlays were fabricated from three types of block and cemented with an adhesive resin cement system...
March 29, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28367908/effect-of-filler-particles-morphology-of-resin-composites-on-cavity-packing-force-for-repeated-condensation
#19
Muhammad Kaleem, David C Watts
Effect of variation in morphology and size of filler particles, temperature and increase in condensation speed on packability of resincomposites was investigated. Eight experimental light-cured resin-composites (RZDn series) were tested. Each material was placed in a cylindrical mould at 26 or 32ºC. A flat-ended stainless-steel probe (φ=6 mm) was mechanically lowered with two different speeds 2 and 8 mm/s onto and into at the surface of the unset sample until a compressive force of 1 N was reached. This was repeated for five cycles, and from each cycle Fp was calculated...
March 29, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28302948/the-accuracy-of-the-cad-system-using-intraoral-and-extraoral-scanners-for-designing-of-fixed-dental-prostheses
#20
Sakura Shimizu, Akikazu Shinya, Soichi Kuroda, Harunori Gomi
The accuracy of prostheses affects clinical success and is, in turn, affected by the accuracy of the scanner and CAD programs. Thus, their accuracy is important. The first aim of this study was to evaluate the accuracy of an intraoral scanner with active triangulation (Cerec Omnicam), an intraoral scanner with a confocal laser (3Shape Trios), and an extraoral scanner with active triangulation (D810). The second aim of this study was to compare the accuracy of the digital crowns designed with two different scanner/CAD combinations...
March 8, 2017: Dental Materials Journal
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