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Dental Materials Journal

Natsuko Imamura, Tomohiro Kawaguchi, Hiroshi Shimizu, Yutaka Takahashi
The aim of this study was to investigate the effect of three metal priming agents on the bond strength of adhesive resin cement to Silver-Zinc-Tin-Indium (Ag-Zn-Sn-In) alloy and pure Ag, Zn, Sn, and In. The specimens were air-abraded with alumina and then primed with one of three metal priming agents: V-Primer, Estenia Opaque Primer, or Alloy Primer. The metal disks were bonded with adhesive resin cement (Super-Bond Bulk-mix technique). Shear bond strengths (n=10/group) were determined before and after 50,000 thermocycles for Ag-Zn-Sn-In alloy as well as after 5,000 thermocycles for pure Ag, Zn, Sn and In...
November 3, 2017: Dental Materials Journal
Satoshi Yokose, Perry R Klokkevold, Henry H Takei, Hiroshi Kadokura, Tetsuya Kikui, Yasushi Hibino, Hirotaka Shigeta, Hiroshi Nakajima, Hiroshi Kawazu
The surface topography of implant fixture is an important factor affecting the osseointegration. We herein demonstrated the effects of surface microtopography of titanium disks on proliferation and differentiation of osteoblast-like cells isolated from rat calvariae. Titanium disks with machine surface (MS), rough surface (R1) and rough surface combined with small cavities (R2) were used in an in vitro culture system. Rough surfaces (R1 and R2 disks) induced stronger osteoblast proliferation and differentiation (BGP and sclerostin mRNA expressions and calcium content) than the smooth surface (MS disk)...
November 3, 2017: Dental Materials Journal
Lai Suo, Zhongjie Li, Feng Luo, Junyu Chen, Lingling Jia, Tong Wang, Xibo Pei, Qianbing Wan
This study developed carbon nanotube coatings for the dentin surface and investigated the bonding strength and the in vitro antibacterial properties of carbon nanotube-coated dentin. Single-walled carbon nanotubes and multi-walled carbon nanotubes were first modified and then characterized using Fourier-transform infrared spectroscopy, scanning electron microscope, and transmission electron microscopy. Second, dentin samples were coated using either single-walled carbon nanotubes or multi-walled carbon nanotubes and observed under a scanning electron microscope...
November 3, 2017: Dental Materials Journal
Santhosh Basavarajappa, Abdul Aziz Abdullah Alkheraif, Saleh M Alhijji, Jukka Pekka Matinlinna, Pekka Kalevi Vallittu
This laboratory study was assessing the nano-mechanical properties (NMP), surface roughness (Sa), and topographic changes caused by ethanol on the surface of heat-polymerized denture base polymers at different time past dough stage. Specimens of heat polymerizing acrylic resin (Interacryl Hot, Interdent, Celje, Slovenia) of size 10×10×3 mm were prepared, wet ground, and polished for uniform smoothness and treated with ethanol in concentrations of 40, 70, and 99.9% for 30, 60, and 120 s and statistical analysis was done...
November 3, 2017: Dental Materials Journal
Haruki Sugisawa, Hideki Kitaura, Kyosuke Ueda, Keisuke Kimura, Masahiko Ishida, Yumiko Ochi, Akiko Kishikawa, Saika Ogawa, Teruko Takano-Yamamoto
Titanium nitride (TiN) coating by ion plating has properties such as high hardness, wear resistance, corrosion resistance, and surface lubricity, therefore TiN coating is often used in various dental appliances and materials. In this study, we evaluated the corrosion behaviors and mechanical properties of TiN coated stainless steel (SS) and nickel titanium (Ni-Ti) orthodontic wires prepared by ion plating. TiN coating by ion plating improves the corrosion resistance of orthodontic wires. The corrosion pitting of the TiN coated wire surface become small...
November 3, 2017: Dental Materials Journal
Hayaki Nakatani, Atsushi Mine, Mariko Matsumoto, Tomoshige Kabetani, Asuka Kawaguchi-Uemura, Mami Higashi, Yuko Tajiri, Dai Imai, Ryosuke Hagino, Takuya Minamino, Jiro Miura, Hirofumi Yatani
This study aimed to evaluate the effect of sulfinic acid sodium salt interposition after acid and sodium hypochlorite treatment (NC treatment) on dentin bonding durability using a mild type one-step self-etching adhesive. Fifteen human third molars were randomly assigned into three experimental groups according to dentin pretreatment before applying the one-step self-etching adhesive: Cont group, without pretreatment; NC group, pretreatment with phosphoric acid and sodium hypochlorite gel; and NC+AC group, additional treatment with sulfinic acid sodium salt followed by the same pretreatment of the NC group...
October 27, 2017: Dental Materials Journal
Qiting Huang, Wei Qin, Sufyan Garoushi, Jingwei He, Zhengmei Lin, Fang Liu, Pekka K Vallittu, Lippo V J Lassila
The objective of this study was to investigate several physicochemical properties of an experimental discontinuous S2-glass fiberreinforced resin composite. The experimental composite was prepared by mixing 10 wt% of discontinuous S2-glass fibers with 27.5 wt% of resin matrix and 62.5 wt% of particulate fillers. Flexural strength (FS) and modulus (FM), fracture toughness (FT), work of fracture (WOF), double bond conversion (DC), Vickers hardness, volume shrinkage (VS) and fiber length distribution were determined...
October 27, 2017: Dental Materials Journal
Maiko Mieda, Ikiru Atsuta, Yasuyuki Matsushita, Takehiro Morita, Yasunori Ayukawa, Yoshihiro Tsukiyama, Yoshinori Sawae, Kiyoshi Koyano
Zirconia exhibits good tissue compatibility and nontoxicity, making it a widely used esthetic replacement material for implant abutments. To avoid abutment-fracture, the parts composed of zirconia with a bonded metal component connected to the implant can be used. The purpose of this study was to design titanium and zirconia components with high fracture resistance at the zirconia component's edge line. Three edge line designs of the titanium base and zirconia sleeve were made: chamfer, shoulder, and backtaper...
October 27, 2017: Dental Materials Journal
Özgür Irmak, Batu Can Yaman, Ekim Onur Orhan, Fusun Ozer, Markus B Blatz
This study investigated the effect of rubbing force magnitude on dentin bond strengths of multi-mode adhesives applied in self-etch mode. Seventy-two extracted human molar teeth were used. Two different universal adhesives Single Bond Universal (SB) and Clearfil Universal (CL) were applied onto dentin surfaces in three different modes: without rubbing (NR), rubbing with 40 gf (gramforce) (40) or 80 gf (80) load. Teeth were restored with a resin composite. Half of the specimens were subject to thermal aging (10,000 cycles)...
October 27, 2017: Dental Materials Journal
Pablo J Atria, Camila S Sampaio, Eduardo Cáceres, Jessica Fernández, Andre F Reis, Marcelo Giannini, Paulo G Coelho, Ronaldo Hirata
This study evaluated the influence of different light-curing modes on the volumetric polymerization shrinkage and degree of conversion of a composite resin at different locations using micro-computed tomography and Fourier transform infrared spectroscopy (FTIR). Specimens were divided into 4 groups based on the light-curing mode used (Bluephase 20i): 1 -High (1,200 mW/cm(2)); 2 -Low (650 mW/cm(2)); 3 -Soft-start (650-1,200 mW/cm(2)); and 4 -Turbo (2,000 mW/cm(2)). Degree of conversion was calculated by the measurement of the peak absorbance height of the uncured and cured materials at the specific wavenumbers, and was performed by FTIR 48 h after curing resin samples...
October 27, 2017: Dental Materials Journal
Isil Cekic-Nagas, Ferhan Egilmez, Gulfem Ergun, Pekka Kalevi Vallittu, Lippo Veli Juhana Lassila
To evaluate the influence of different materials on the load-bearing-capacity of inlay-retained fixed-dental-prosthesis (FDP). Ten types of FDPs were evaluated (n=7/group): Group PEEK: CAD-CAM polyetheretherketone (PEEK-TechnoMed), Group RC, made of discontinuous-fiber-composite (EverX Posterior); Group FRC1, made of discontinuous-fiber-composite (EverX Posterior) with two-bundles of continuous-unidirectional fiber-reinforced-composite (FRC) (Everstick C&B); Group FRC2, made of discontinuousfiber-composite (EverX Posterior) with two-bundles of continuous-unidirectional-FRC (Everstick C&B) covered by two-pieces of short-unidirectional-FRC (Everstick C&B) placed perpendicular to the main-framework; Group FB, CAD-CAM fiber-block (FibraComposite Bio-C); Group PMMA, CAD-CAM polymethyl methacrylate block (Temp basic); Group RP, resin-paste; Group FRP1, made of resin-paste (G-Fix) with two-bundles of continuous-unidirectional-FRC (Everstick C&B); Group FRP2, made of resin-paste (G-Fix) two-bundles of continuous-unidirectional-FRC covered by two-pieces of short unidirectional-FRC placed perpendicular to the mainframework and Group exp-FRC, experimental CAD-CAM FRC...
October 27, 2017: Dental Materials Journal
Kaoru Suzuki, Tomofumi Takano, Shinji Takemoto, Takayuki Ueda, Masao Yoshinari, Kaoru Sakurai
The objective was to investigate the influence of grade and surface topography of commercially pure titanium (Cp-Ti) on fatigue properties evaluated via staircase method. Cp-Ti grades 2 and 4 were roughened by shot blasting and acid etching, and compared with machined specimens. Yield force under static loading for Cp-Ti grades 2 and 4 were 672±51 and 1,088±93 N for machined and 724±99 and 1,118±96 N for roughened group. Yield force under cyclic loading for Cp-Ti grades 2 and 4 decreased 27 and 40% compared to static loading...
September 28, 2017: Dental Materials Journal
Satoshi Yamaguchi, Idris Mohamed Mehdawi, Takahiko Sakai, Tomohiro Abe, Sayuri Inoue, Satoshi Imazato
The aim of this study was to investigate a failure criterion to predict flexural strengths of composite resins (CR) by three-dimensional finite element analysis (3D-FEA). Models of flexural strength for test specimens of CR and rods comprising a three-point loading were designed. Calculation of Young's moduli and Poisson's ratios of CR were conducted using a modified McGee-McCullough model. Using the experimental CR, flexural strengths were measured by three-point bending tests with crosshead speed 1.0 mm/min and compared with the values determined by in silico analysis...
September 28, 2017: Dental Materials Journal
Kazuhiro Yoshida, Gregory L Polyzois, Mary J Frangou, Hiroshi Murata
The purpose of this study was to evaluate and compare the dynamic mechanical properties of two acetal resins (different colored samples of the same resin), an autopolymerized reline resin, and a heat-polymerized denture base resin. Measurements were obtained in two conditions, the frequency- and temperature-dependent conditions, using a dynamic viscoelastometer. The acetal resins exhibited lower loss tangent values than the autopolymerized reline resin and heat-polymerized denture base resin. With respect to temperature dependence, all of the materials displayed stable viscoelastic properties in the temperature range found in the oral environment...
September 28, 2017: Dental Materials Journal
Akimasa Tsujimoto, Wayne W Barkmeier, Robert L Erickson, Toshiki Takamizawa, Mark A Latta, Masashi Miyazaki
The influence of the number of cycles on shear fatigue strength to enamel and dentin using dental adhesives in self-etch mode was investigated. A two-step self-etch adhesive and two universal adhesives were used to bond to enamel and dentin in self-etch mode. Initial shear bond strength and shear fatigue strength to enamel and dentin using the adhesive in self-etch mode were determined. Fatigue testing was used with 20 Hz frequency and cycling periods of 50,000, 100,000 and 1,000,000 cycles, or until failure occurred...
September 28, 2017: Dental Materials Journal
Thwe Zin Ei, Yasushi Shimada, Syozi Nakashima, Maria Jacinta Rosario H Romero, Yasunori Sumi, Junji Tagami
This study compared resin-based and glass ionomer sealants with regard to their fluoride-release behavior and anti-demineralization potential on adjacent unsealed enamel surfaces. Sealant cavities prepared on bovine enamel blocks were filled with fluoride-containing resin sealants [TeethmateF-1 (TF), Clinpro(TM) (CP)], and glass ionomer sealant [Fuji VII (FVII)]. Specimens were then incubated in artificial saliva for 14 days to measure fluoride. Thereafter, demineralization was performed for 10 days, and the anti-demineralization efficacy was assessed by Swept Source Optical Coherence Tomography (SS-OCT), and cross-sectional nanohardness...
September 28, 2017: Dental Materials Journal
Futoshi Komine, Shingo Kamio, Hiroki Takata, Shogo Yagawa, Serina Taguchi, Kohei Taguchi, Akiko Hashiguchi, Hideo Matsumura
This study evaluated the effect of zirconia framework design on fracture load of implant-supported zirconia-based prostheses after thermal cycling and mechanical loading. Three different zirconia framework designs were investigated: uniform-thickness (UNI), anatomic (ANA), and supported anatomic (SUP) designs. Each framework was layered with feldspathic porcelain (ZAC group) or indirect composite material (ZIC group). The specimens then underwent fracture load testing after thermal cycling and cyclic loading...
September 7, 2017: Dental Materials Journal
Takatsugu Yamamoto, Masao Hanabusa, Saori Kimura, Yasuko Momoi, Tohru Hayakawa
The objective of this study was to investigate changes in polymerization stress and elastic modulus for light-cured bulk-fill resin composites following irradiation. Crack analysis was applied to obtain the stresses for 24 h after irradiation, which were calculated from the lengths of cracks in a glass mold bonded to the composites. The elastic modulus was repeatedly measured by nano-indentation tests performed over 24 h. The lengths of the cracks, the interfacial stress, and the elastic modulus were significantly affected by the material and time after irradiation (p<0...
September 7, 2017: Dental Materials Journal
Ahmed Jamleh, Hideaki Suda, Carlos G Adorno
This study evaluated the irrigation extrusion and smear layer (SL) removal of continuous ultrasonic irrigation (CUI). Forty root canals were shaped, embedded in warm sterile saline agar colored with 1% acid red, and distributed into four groups; three groups had the final irrigation sequence of sodium hypochlorite and EDTA solutions performed by using syringe irrigation (SI), EndoVac (EV), and CUI, respectively. Group 4 had the canals ultrasonically irrigated with saline (CUIS). Irrigant extrusion was verified by a color change of the agar...
September 7, 2017: Dental Materials Journal
Evaggelia Papia, Pernilla Arnoldsson, Ayna Baudinova, Ryo Jimbo, Per Vult VON Steyern
The objectives were to analyze the oxide layer generated between titanium and porcelain during firing and compare it in different manufacturing techniques: cast, milled and EBM-technique. Seventy two specimens were manufactured, subdivided according to surface treatment: time of passivation (P) and no time of passivation (NP) before porcelain firing. Specimens from each group were analyzed with scanning electron microscopy: one only fired once, and one subjected to six firings. Remaining specimens were subjected to shear bond strength test...
September 7, 2017: Dental Materials Journal
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