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Dental Materials Journal

Haruaki Kitagawa, Kahoru Takeda, Ririko Tsuboi, Mikako Hayashi, Jun-Ichi Sasaki, Satoshi Imazato
Dental adhesive resins based on 4-methacryloxyethyl trimellitate anhydride (4-META)/methyl methacrylate (MMA) have been utilized for root-end filling and the bonding of fractured roots. To increase the success rate of these treatments, it would be beneficial to promote the healing of surrounding tissue by applying growth factors. In this study, the influences of the polymerization properties of 4-META/MMA-based resins on the activity of fibroblast growth factor-2 (FGF-2) were evaluated in vitro. The temperature increase caused by the heat generation during polymerization of the 4-META/MMA-based resin was insufficient to change the structure and function of FGF-2...
June 15, 2017: Dental Materials Journal
Jun Makiishi, Tomonori Matsuno, Atsuo Ito, Yu Sogo, Tazuko Satoh
Molten 10 wt% gatifloxacine (GLFX-loaded poly(lactide-co-glycolide) (PLGA) was introduced into three-dimensionally interconnected pores and onto the surfaces of hydroxyapatite (HA) granules. The composite granules exhibited clinically sufficient bactericidal activities against Streptococcus milleri and Bacteroides fragilis from 3 h to 10 days. The composite granules were implanted in bone defects created by debridement of osteomyelitis lesions in rabbit mandibles. After 4-week implantation, inflammation in the composite granule-implanted group was significantly smaller than that in the debridement group (p<0...
June 15, 2017: Dental Materials Journal
Takashi Nezu, Futami Nagano-Takebe, Kazuhiko Endo
Antimicrobial cetylpyridinium chloride (CPC) has low miscibility with acrylic resin monomer but can be homogeneously mixed using ethanol as a cosolvent. This study investigated the effects of ethanol addition on the properties of a cold-cure acrylic resin. Ethanol was an excellent cosolvent for CPC and methyl methacrylate monomer (MMA), but the cured resin exhibited a strong change in coloration to yellow (ΔE*ab>8) and a drastically reduced bending strength (from 97 to 25 MPa) and elastic modulus (from 2...
June 15, 2017: Dental Materials Journal
Elif Yasa, Cigdem Atalayin, Gamze Karacolak, Tugrul Sari, L Sebnem Turkun
The aim of this study was to evaluate the intrapulpal temperature changes during the curing of different bulk-fill restorative materials. Ten mandibular molar teeth were selected and occlusal surfaces were removed to obtain a standard 0.5 mm occlusal dentin thickness. Five bulk-fill restorative materials and a conventional resin composite (control) were applied. The intrapulpal temperature changes during the curing of these materials were determined by a device simulating pulpal blood microcirculation. The difference between the initial and maximum temperature values (Δt), was recorded...
June 15, 2017: Dental Materials Journal
Masaki Asakura, Tatsuhide Hayashi, Shozo Tsuruta, Mitsunori Yamamoto, Shuichiro Kobayashi, Akimichi Mieki, Tatsushi Kawai
The purpose of this study is to develop a method for quantifying the fluidity of flowable resin composites using determinations of yield stress. Five commercially available composites (AliteFlo LV, Flow-it ALC, Venus flow, Tetric N-flow, Revolution Formula2) were investigated. Yield stress values were obtained by plotting shear stresses for a range of shear rates, followed by fitting of Casson fluid models to flow curve data and extrapolation to the stress axis. To confirm that yield stress reflected fluidity, apparent viscosity at the lower shear rate (0...
June 15, 2017: Dental Materials Journal
Tomoko Someya, Hideaki Kinoshita, Rino Harada, Eiji Kawada, Shinji Takemoto
The aim of this study was to determine the effects of calcium hydroxide (Ca(OH)2) treatment on bond strength of resin cements to root dentin and retention force of fiber-reinforced composite (FRC) posts. Bovine root dentin was endodontically prepared and treated with Ca(OH)2 for 7 days. Root dentin for bond strength test was adhered to resin-composite with resin cements. For pull-out test, posts consisting of FRC posts and resin-composites were fabricated and cemented to root. Shear bond and pull-out tests were performed using a universal testing machine...
May 30, 2017: Dental Materials Journal
Kazuya Doi, Takayasu Kubo, Shiho Kajihara, Yusuke Makihara, Hiroshi Oue, Yoshifumi Oki, Vittoria Perrotti, Adriano Piattelli, Yasumasa Akagawa, Kazuhiro Tsuga
The aim of this study was to evaluate the stability of implant/interconnected porous calcium hydroxyapatite complex (implant/IPCHA-complex) under functional loading. Implant/IP-CHA-complexes were placed into the mandibles of four Beagle-Labrador hybrid dogs (complex-group). On the other side, an implant was placed directly (control-group). To subject the loading, the animals were fed a hard diet throughout the loading phase of 5 months. The implant stability quotients (ISQs) and bone implant contact (BIC), and histological evaluations were performed...
May 30, 2017: Dental Materials Journal
Masahiro Okada, Kazusa Inoue, Masao Irie, Hiroaki Taketa, Yasuhiro Torii, Takuya Matsumoto
Resin bonding to zirconia ceramics is difficult to achieve using the standard methods for conventional silica-based dental ceramics, which employ silane coupling monomers as primers. The hypothesis in this study was that a silane coupling oligomer -a condensed product of silane coupling monomers- would be a more suitable primer for zirconia. To prove this hypothesis, the shear bond strengths between a composite resin and zirconia were compared after applying either a silane coupling monomer or oligomer. The shear bond strength increased after applying a non-activated ethanol solution of the silane coupling oligomer compared with that achieved when applying the monomer...
May 30, 2017: Dental Materials Journal
Juthatip Aksornmuang, Chanya Chuenarrom, Natjira Chittithaworn
The purpose of this study was to evaluate the flexural properties and surface topography of fiber posts surface-treated with various etching protocols. Seventy each of three types of fiber posts: RelyX Fiber Post, Tenax Fiber Trans, and D.T. Light-Post Illusion X-Ro, were randomly divided into 7 groups: no surface treatment, surface treated with hydrofluoric acid (HF) 4.5% for 60 s, HF 4.5% for 120 s, HF 9.6% for 15 s, HF 9.6% for 60 s, HF 9.6% for 120 s, and treated with H2O2 24% for 10 min. The specimens were then subjected to a three-point bending test...
May 30, 2017: Dental Materials Journal
An Yang, Dan Zhao, Yaqin Wu, Chun Xu
The aim of the study was to evaluate the effect of modifying polymethyl methacrylate (PMMA) denture base material with polyimide (PI) on its flexural property and biocompatibility. Low molecular weight (1,500 g/mol) PI was synthesized and small amount of PI (0.4, 0.6, 0.8 and 1 wt%) was dispersed into the PMMA matrix. Three-point bending tests, scanning electron microscopy and thermal cycling were used to measure the mechanical properties, while MTT assay was used to evaluate the biocompatibility of the denture base material...
May 30, 2017: Dental Materials Journal
Burcu Serefoglu, Beyser Piskin
The aim of this investigation was to compare the cleaning and shaping efficiency of Self-adjusting file and Protaper, and to assess the correlation between root canal curvature and working time in mandibular molars using micro-computed tomography. Twenty extracted mandibular molars instrumented with Protaper and Self-adjusting file and the total working time was measured in mesial canals. The changes in canal volume, surface area and structure model index, transportation, uninstrumented area and the correlation between working-time and the curvature were analyzed...
May 30, 2017: Dental Materials Journal
Bin Shi, Oleh Andrukhov, Burcu Özdemir, Hassan Ali Shokoohi Tabrizi, Michel Dard, Xiaohui Rausch-Fan
Angiogenesis play a crucial role in the regeneration of hard and soft tissue around dental titanium (Ti) implant. Enamel matrix derivative (EMD) promotes tissue regeneration and stimulates angiogenesis but its effect on the angiogenesis on Ti surfaces was never investigated. The effect of EMD on the angiogenic activity of endothelial cells cultured on pre-treated smooth Ti (PT), acidetched (A), coarse-grit blasted and acid-etched (SLA) surfaces and tissue culture plastic (TCP) in the presence or absence of EMD was investigated...
May 30, 2017: Dental Materials Journal
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
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
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
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
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
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
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
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
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