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Dental Materials Journal

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https://www.readbyqxmd.com/read/28747598/the-effect-of-crude-drugs-on-the-angiogenic-property-and-dynamic-viscoelasticity-of-pema-based-soft-polymer-materials
#1
Wei-Qi Wang, Guang Hong, Jian-Min Han, Hiroshi Murata, Keiichi Sasaki
This study aimed to determine the effect of crude drugs on the dynamic viscoelasticity and angiogenic property of soft polymer materials, in vitro. Two kinds of polyethyl methacrylates, and crude drugs (Astragalus membranaceus Bunge [HQ] and Salvia miltiorrhiza Bunge [DS]) were used in their powdered forms. And, acetyl tributyl citrate and ethyl alcohol were used in the liquid form. The dynamic viscoelasticity of each specimen was measured after 0, 1, 3, 7, 14 and 28 days of immersion in distilled water. The CellPlayer angiogenesis PrimeKit assay was used to test angiogenesis...
July 26, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28747597/antimicrobial-activity-of-ethylene-vinyl-acetate-containing-bioactive-filler-against-oral-bacteria
#2
Kosuke Nagai, Hisanori Domon, Masataka Oda, Tomoe Shirai, Tatsuya Ohsumi, Yutaka Terao, Yoshiaki Arai
We developed an ethylene vinyl acetate (EVA) containing surface pre-reacted glass-ionomer (S-PRG) filler, as a new mouthguard material for preventing intraoral bacterial infection. We examined its physical properties, antimicrobial activity against a major cariogenic bacterium Streptococcus mutans and a periodontopathogen Porphyromonas gingivalis, and its cytotoxicity toward human gingival epithelial cells. S-PRG filler was added to EVA copolymer at 5, 10, 20, or 40 wt% and was processed into disc-shaped test specimens...
July 26, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28747596/intraoral-electric-potential-via-oral-bacterial-power-generation-a-novel-mechanism-of-biofilm-formation
#3
Takashi Kameda, Shun-Ya Oka, Yuko Morozumi, Kazuto Terada, Atsushi Toyama, Kazuo Ohkuma, Mitsuru Kudo, Fujio Ikeda
In the early stages of biofilm accumulation, the electric charge of the dental enamel and pellicle surfaces is known to be involved. We therefore investigated the relationship between oral hygiene and intraoral electric potential (IoP) in 45 male participants using a double-blind study. IoP, but not body surface electric potential, was loosely correlated with oral hygiene condition (Oral Hygiene Index; OHI). IoP was also loosely correlated with smartphone use; however, there was no significant correlation between smartphone use and OHI...
July 26, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28747595/nac-ameliorates-dental-composite-induced-dna-double-strand-breaks-and-chromatin-condensation
#4
Panorea Styllou, Marianthi Styllou, Reinhard Hickel, Christof Högg, Franz Xaver Reichl, Harry Scherthan
Released (co)monomers from dental composite components can induce DNA damage of which DNA double-strand breaks (DSBs) threaten genome integrity. Here, we tested whether the administration of the antioxidant N-acetylcysteine (NAC) is able to reduce the dental composite-induced DSBs in primary human gingiva fibroblasts. The dental composites Bis-GMA (bisphenol-A-glycerolate dimethacrylate), GMA (glycidyl methacrylate), HEMA (2-hydroxyethyl methacrylate) and TEGDMA (triethyleneglycol dimethacrylate) were found to induce co-localizing microscopic nuclear foci numbers of the DSB markers γ-H2AX and 53BP1 per cell in the order: GMA>Bis-GMA>TEGDMA>HEMA...
July 26, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28747594/mechanical-and-biological-effects-of-infiltration-with-biopolymers-on-3d-printed-tricalciumphosphate-scaffolds
#5
Matthias Cornelsen, Florian Andreas Probst, Christina Schwarz, Egon Burian, Matthias Tröltzsch, Sven Otto, Maximilian Michael Saller, Matthias Schieker, Hermann Seitz
The aim of this study was to evaluate the influence of infiltrating 3D printed (TCP) scaffolds with different biodegradable polymers on their mechanical and biological properties. 3D printed TCP scaffolds with interconnecting channels measuring 450±50 µm were infiltrated with four different biodegradable copolymers. To determine the average compressive strength, a uniaxial testing system was used. Additionally, scaffolds were seeded with MC3T3 cells and cell viability was assessed by live/dead-assay. Uninfiltrated TCP had an average compression strength of 1...
July 26, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28701640/the-effect-of-five-kinds-of-surface-treatment-agents-on-the-bond-strength-to-various-ceramics-with-thermocycle-aging
#6
Yukari Noda, Masatoshi Nakajima, Masahiro Takahashi, Teerapong Mamanee, Keiichi Hosaka, Tomohiro Takagaki, Masaomi Ikeda, Richard M Foxton, Junji Tagami
This study evaluated the effects of ceramic surface treatment agents on shear bond strengths to ceramic materials with and without thermocycling. Ceramic plates were prepared from feldspathic ceramic; AAA, lithium disilicate ceramic material; IPS e.max Press, zirconia ceramic; Lava. Ceramic surfaces were pretreated with one of five surface treatment agents (Clearfil PhotoBond mixed with Porcelainbond activator (PB), Clearfil SE One mixed with Porcelainbond activator (SO), Ceramic Primer (CP), Universal Primer (UP), Scotchbond Universal (SU)), and then a resin cement (Clapearl DC) was filled...
July 12, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28701639/synthesized-mesoporous-silica-and-calcium-aluminate-cement-fillers-increased-the-fluoride-recharge-and-lactic-acid-neutralizing-ability-of-a-resin-based-pit-and-fissure-sealant
#7
Atikom Surintanasarn, Krisana Siralertmukul, Niyom Thamrongananskul
This study evaluated the effect of different types of filler in a resin-based pit and fissure sealant on fluoride release, recharge, and lactic acid neutralization. Resin-based sealant was incorporated with 5% w/w of the following fillers: calcium aluminate cement (CAC), synthesized mesoporous silica (SI), a CAC and SI mixture (CAC+SI), glass-ionomer powder (GIC), and acetic acid-treated GIC (GICA). Sealant without filler served as control. The samples were immersed in deionized water or a lactic acid solution and the concentration of fluoride in the water, before and after fluoride recharge, and the lactic acid pH change, respectively, were determined...
July 12, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28701638/antibacterial-activity-cytotoxicity-and-mechanical-behavior-of-nano-enhanced-denture-base-resin-with-different-kinds-of-inorganic-antibacterial-agents
#8
Rongrong Chen, Zhihui Han, Zhuoli Huang, Junu Karki, Chenxin Wang, Bangshang Zhu, Xiuyin Zhang
Silanized aluminum borate whiskers (ABWs) of 4 wt%, silanized zirconium dioxide nanoparticles (nano-ZrO2) of 2 wt% were mixed with polymethyl methacrylate (PMMA) powder to get ZrO2-ABWs/PMMA composites. Titanium dioxide (TiO2), silver-supported titanium dioxide (Ag/TiO2), silver-supported zirconium phosphate (Novaron) and tetrapod-like zinc oxide whiskers (T-ZnOw) antibacterial agents of 3 wt% were mixed with ZrO2-ABWs/PMMA composites respectively to fabricate standard specimens. Plaque biofilms on the specimens surface were investigated for colony-forming units (CFUs)...
July 12, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28701637/retention-and-caries-preventive-effect-of-glass-ionomer-and-resin-based-sealants-an-18-month-randomized-clinical-trial
#9
Asma Al-Jobair, Nouf Al-Hammad, Salwa Alsadhan, Fouad Salama
The objective of this study was to compare the retention and caries-preventive effect of glass ionomer (Fuji Triage) and resin-based (Clinpro) sealants among 6-9-year-old children. This split-mouth, randomized clinical trial covered 35 children/140 fully erupted permanent first molars. Evaluation was conducted by two independent examiners after 6, 12, and 18 months and the data were compared in relation to the children's caries risk and age groups. The Kaplan-Meier survival method and chi-square test were used for analysis...
July 12, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28701636/influence-of-air-powder-polishing-on-bond-strength-and-surface-free-energy-of-universal-adhesive-systems
#10
Yukie Tamura, Toshiki Takamizawa, Yutaka Shimamura, Shunsuke Akiba, Chiaki Yabuki, Arisa Imai, Akimasa Tsujimoto, Hiroyasu Kurokawa, Masashi Miyazaki
The influences of air-powder polishing with glycine or sodium bicarbonate powders on shear bond strengths (SBS) and surface-free energies of universal adhesives were examined. Scotchbond Universal Adhesive (SU, 3M ESPE), G-Premio Bond (GP, GC), Adhese Universal (AU, Ivoclar Vivadent), and All-Bond Universal (AB, Bisco) were used in this study. Bovine dentin surfaces were air polished with glycine or sodium bicarbonate powders prior to the bonding procedure, and resin pastes were bonded to the dentin surface using universal adhesives...
July 12, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28652556/characteristics-of-low-polymerization-shrinkage-flowable-resin-composites-in-newly-developed-cavity-base-materials-for-bulk-filling-technique
#11
Keiko Nitta, Rie Nomoto, Yuji Tsubota, Masuji Tsuchikawa, Tohru Hayakawa
The purpose of this study was to evaluate polymerization shrinkage and other physical properties of newly-developed cavity base materials for bulk filling technique, with the brand name BULK BASE (BBS). Polymerization shrinkage was measured according to ISO/FDIS 17304. BBS showed the significantly lowest polymerization shrinkage and significantly higher depth of cure than conventional flowable resin composites (p<0.05). The Knoop hardness, flexural strength and elastic modulus of that were significantly lower than conventional flowable resin composites (p<0...
June 23, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28652555/novel-orthodontic-cement-containing-dimethylaminohexadecyl-methacrylate-with-strong-antibacterial-capability
#12
Xiaodong Feng, Ning Zhang, Hockin H K Xu, Michael D Weir, Mary Anne S Melo, Yuxing Bai, Ke Zhang
Orthodontic treatments increase the incidence of white spot lesions. The objectives of this study were to develop an antibacterial orthodontic cement to inhibit demineralization, and to evaluate its enamel shear bond strength and anti-biofilm properties. Novel antibacterial monomer dimethylaminohexadecyl methacrylate (DMAHDM) was synthesized and incorporated into Transbond XT at 0, 1.5 and 3% by mass. Anti-biofilm activity was assessed using a human dental plaque microcosm biofilm model. Shear bond strength and adhesive remnant index were also tested...
June 23, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28652554/the-effects-of-post-and-core-material-combination-on-the-surface-strain-of-the-4-unit-zirconia-fixed-partial-denture-margins
#13
Yoko Ishikawa, Wataru Komada, Tasuku Inagaki, Reina Nemoto, Satoshi Omori, Hiroyuki Miura
The suitability of various post and core materials for the 4-unit zirconia fixed partial denture abutment teeth was investigated to lower stress concentration. Artificial mandibular teeth (44 and 47) were used as the abutment teeth. There were two types of posts and cores: resin composite with glass fiber posts (RC), and cast platinum gold alloy (MC). Two experimental groups were analyzed. For Group RM, the premolars were restored with RC and the molars were restored with MC. For Group MR, the premolars were restored with MC and the molars were restored with RC...
June 23, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28652553/establishment-of-experimental-models-to-evaluate-the-effectiveness-of-dental-trauma-splints
#14
Takahiro Shirako, Hiroshi Churei, Takahiro Wada, Motohiro Uo, Toshiaki Ueno
The purpose was to describe a novel simple experimental model of injured teeth for developing dental trauma splints (DTS), and to test various splints by combining use of this model and the Periotest(®) device. Rubber O-rings and spring washers were used to simulate and modify injured tooth mobility. Splinting effects were assessed among three kinds of DTS, including a composite splint and two wire-composite splints (1: rectangular orthodontic wire 0.533×0.635 mm, 2: cobalt-chromium alloy wire Φ0.9 mm). The Periotest values were measured three times for each tooth before and after splint insertion...
June 23, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28652552/influence-of-photoirradiation-conditions-on-dentin-bond-durability-and-interfacial-characteristics-of-universal-adhesives
#15
Kazutaka Hirai, Akimasa Tsujimoto, Kie Nojiri, Hirofumi Ueta, Toshiki Takamizawa, Wayne W Barkmeier, Mark A Latta, Masashi Miyazaki
The influence of photoirradiation conditions on dentin bond durability and interfacial characteristics of universal adhesives was investigated. Universal adhesives were applied to the dentin surfaces and photoirradiated with 100 mW/cm(2) for 40 s, 200 mW/cm(2) for 20 s, and 400 mW/cm(2) for 10 s. A resin composite was bonded to dentin to determine shear bond strength after 24 h water storage and 30,000 thermal cycles, and water contact angle of cured adhesive were measured by the sessile drop method. Greater dentin bond strengths after 24 h water storage and 30,000 thermal cycles were achieved under these conditions at light intensity exceeding 200 mW/cm(2)...
June 23, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28652551/review-of-titanate-coupling-agents-and-their-application-for-dental-composite-fabrication
#16
Nidal Wanis Elshereksi, Mariyam Ghazali, Andanastuti Muchtar, Che Husna Azhari
Silane is a dominant coupler that is widely used in dentistry to promote adhesion among the components of dental composites. Silica-based fillers can be easily silanized because of their similarly ordered structure. However, silane is hydrolytically degraded in the aqueous oral environment and inefficiently bonds to non-silica fillers. Thus, the development of hydrolytically stable dental composites is an important objective in the research on dental materials. Titanate coupling agents (TCAs) exhibit satisfactory interfacial bonding, enhanced homogeneous filler dispersion, and improved mechanical properties of the composites...
June 23, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28626207/influence-of-polymerization-properties-of-4-meta-mma-based-resin-on-the-activity-of-fibroblast-growth-factor-2
#17
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
https://www.readbyqxmd.com/read/28626206/in-vitro-in-vivo-evaluation-of-the-efficacy-of-gatifloxacine-loaded-plga-and-hydroxyapatite-composite-for-treating-osteomyelitis
#18
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
https://www.readbyqxmd.com/read/28626205/designing-an-antibacterial-acrylic-resin-using-the-cosolvent-method-effect-of-ethanol-on-the-optical-and-mechanical-properties-of-a-cold-cure-acrylic-resin
#19
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
https://www.readbyqxmd.com/read/28626204/intrapulpal-temperature-changes-during-curing-of-different-bulk-fill-restorative-materials
#20
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
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