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Dental Materials Journal

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https://www.readbyqxmd.com/read/29311433/local-viscoelastic-response-of-direct-and-indirect-dental-restorative-composites-measured-by-afm
#1
Laura Grattarola, Giacomo Derchi, Alberto Diaspro, Carla Gambaro, Marco Salerno
We investigated the viscoelastic response of direct and indirect dental restorative composites by the novel technique of AM-FM atomic force microscopy. We selected four composites for direct restorations (Adonis, Optifil, EPH, CME) and three composites for indirect restorations (Gradia, Estenia, Signum). Scanning electron microscopy with micro-analysis was also used to support the results. The mean storage modulus of all composites was in the range of 10.2-15.2 GPa. EPH was the stiffest (p<0.05 vs. all other composites but Adonis and Estenia), while no significant difference was observed between direct and indirect group (p≥0...
December 31, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/29311428/fracture-strengths-of-endocrown-restorations-fabricated-with-different-preparation-depths-and-cad-cam-materials
#2
Burcu Kanat-Ertürk, Serkan Saridağ, Ege Köseler, Dilek Helvacioğlu-Yiğit, Egemen Avcu, Yasemin Yildiran-Avcu
The objectives of this study were to compare the fracture strength of endocrown restorations fabricated with different preparation depth and various CAD/CAM ceramics, and to assess the fracture types. Endodontically treated 100 extracted human permanent maxillary centrals were divided into two preparation depth groups as short (S: 3-mm-deep) and long (L: 6-mm-deep), then five ceramic subgroups, namely: feldspathic-ceramic (Vita Mark II-VM2), lithium-disilicate glass-ceramic (IPS e.max CAD-E.max), resin-ceramic (LAVA Ultimate-LU), polymer infiltrated ceramic (Vita Enamic-VE) and monoblock zirconia (inCoris TZI-TZI) (n=10/subgroup)...
December 29, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/29279548/concept-and-clinical-application-of-the-resin-coating-technique-for-indirect-restorations
#3
Toru Nikaido, Junji Tagami, Hirofumi Yatani, Chikahiro Ohkubo, Tomotaro Nihei, Hiroyasu Koizumi, Toshio Maseki, Yuichiro Nishiyama, Tomoyoshi Takigawa, Yuji Tsubota
The resin-coating technique is one of the successful bonding techniques used for the indirect restorations. The dentin surfaces exposed after cavity preparation are coated with a thin film of a coating material or a dentin bonding system combined with a flowable composite resin. Resin coating can minimize pulp irritation and improve the bond strength between a resin cement and tooth structures. The technique can also be applied to endodontically treated teeth, resulting in prevention of coronal leakage of the restorations...
December 27, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/29279547/characterization-of-fluoride-releasing-restorative-dental-materials
#4
Sufyan Garoushi, Pekka K Vallittu, Lippo Lassila
This study aimed to evaluate and compare certain mechanical properties, Vickers-hardness, water sorption, fluoride-release, shrinkage-stress and wear of five commercial fluoride-releasing restorative materials (Dyract, CompGlass, BEAUTIFIL II, ACTIVARestorative, and GC Fuji II LC), in relation to their microstructural characteristics. Mechanical properties were determined for each material following ISO standards. A wear test was conducted with 15,000 chewing cycles using a dual-axis chewing simulator. Daily fluoride-release was measured during the first 10 days by using a fluoride ion selective electrode...
December 27, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/29279546/application-of-fluoridated-hydroxyapatite-thin-film-coatings-using-krf-pulsed-laser-deposition
#5
Yoshiya Hashimoto, Mamoru Ueda, Yu Kohiga, Kazuki Imura, Shigeki Hontsu
Fluoridated hydroxyapatite (FHA) was investigated for application as an implant coating for titanium bone substitute materials in dental implants. A KrF pulsed excimer deposition technique was used for film preparation on a titanium plate. The compacts were ablated by laser irradiation at an energy density of 1 J/cm2 on an area 1×1 mm2 with the substrate at room temparature. Energydispersive spectrometric analysis of the FHA film revealed peaks of fluorine in addition to calcium and phosphorus. X-ray diffraction revealed the presence of crystalline FHA on the FHA film after a 10 h post annealing treatment at 450°C...
December 27, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/29279545/shear-bond-strength-and-microleakage-of-a-new-self-etch-adhesive-pit-and-fissure-sealant
#6
Vinay Pitchika, Sebastian Birlbauer, Meng-Ling Chiang, Christoph Schuldt, Alexander Crispin, Reinhard Hickel, Jan Kühnisch
This study aimed to evaluate the shear bond strength (SBS) and microleakage of a new self-etch adhesive-based fissure sealant (EG) on aprismatic enamel in comparison to conventional fissure sealing with 30 s acid etching (CG). The fissures were sealed according to the manufacturer's instructions. Each group was divided into 3 subgroups: 1-day water storage, 3-month water storage, and 5,000× thermocycling. After measuring SBS using the Ultradent method, failure mode was analyzed. In additional 16 teeth, microleakage was tested using dye penetration method...
December 27, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/29279544/use-of-grape-seed-extract-for-improving-the-shear-bond-strength-of-total-etching-adhesive-to-bleached-enamel
#7
Yingxin Xu, Jianfeng Zhou, Jianguo Tan
This study was to ascertain if grape seed extract (GSE) can restore the shear bond strength (SBS) of total-etching adhesive to enamel immediately after bleaching. Immediately after bleaching with Beyond gel, different concentrations of GSE were applied to the surface of bovine enamel for 1 min before bonding of resin composite with Adper single bond 2 or All-Bond 3 adhesive. SBS values and debonding modes were recorded. Structure of the bonding interface and elements on enamel surface were analyzed by scanning electron microscopy and X-ray photoelectron spectroscopy (XPS)...
December 27, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/29279543/osteoblasts-preferentially-adhere-to-peaks-on-micro-structured-titanium
#8
Paola Lagonegro, Giovanna Trevisi, Lucia Nasi, Ludovica Parisi, Edoardo Manfredi, Simone Lumetti, Francesca Rossi, Guido M Macaluso, Giancarlo Salviati, Carlo Galli
The aim of the study was to investigate cell adhesion to micro-structured titanium. Osteoblastic MC3T3 cells were cultured on smooth (P) or sand-blasted/acid-etched (SLA) titanium discs and were observed at scanning electron microscope/focused ion beam (SEM/FIB). Myosin II and actin microfilaments were labelled for epifluorescence microscopy. FIB revealed that cell adhesion initiated centrally and expanded to the cell periphery and that cells attached on the substrate by bridging over the titanium irregularities and adhering mostly on surface peaks...
December 27, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/29279542/customized-surgical-template-fabrication-under-biomechanical-consideration-by-integrating-cbct-image-cad-system-and-finite-element-analysis
#9
Jian-Hong Yu, Yu-Tzu Wang, Chun-Li Lin
This study developed a customized surgical template under mechanical consideration for molar intrusion. Two finite element (FE) models were analyzed for the primary stability under 100 gf traction forces with one mini-screw inserted at the buccal side in horizontal and another in palatal side with two optional positions at 60° (P60) or 15° (P15) angles with inclination toward the molar occlusal surface. The surgical template was generated using rapid prototyping (RP) printing for the clinical application based on improved primarily stability model...
December 27, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/29279541/in-vitro-evaluation-of-electrospun-plga-plla-pdlla-blend-fibers-loaded-with-naringin-for-guided-bone-regeneration
#10
Zhenzhao Guo, Shuai Wu, Hong Li, Qiyan Li, Gang Wu, Changren Zhou
The present study was to evaluate fiber mesh loaded with naringin via electrospinning to guide bone regeneration in vitro. The naringin-loaded fiber mesh was prepared via elctrospinning of PLGA, PLLA, PDLLA blending solution with naringin. SEM showed that naringin decreased the fiber's diameter according to the concentration of naringin. After 20 days' degradation in PBS, the drugloaded fiber meshes still kept their stability with about 10% decrease in tensile strength. In vitro release experiments showed a sustained and steady naringin releasing profile with little initial burst releasing...
December 27, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/29225280/quaternary-ammonium-compounds-in-dental-restorative-materials
#11
Yu Zhang, Yinyan Chen, Yuntong Hu, Fang Huang, Yuhong Xiao
Quaternary ammonium compounds (QACs) have been used widely in medicine, owing to their antimicrobial properties. They also have strong permeability, stable performance, low skin irritation, low toxicity, low corrosion, lasting biological effects and so on, comparing with other antimicrobial agents. At the end of last century, polymerizable quaternary ammonium antimicrobial monomers had been synthesized and applied in dentistry, in order to reduce or prevent microbial biofilm formation on dental materials surfaces...
December 8, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/29225279/influence-of-enamel-prism-orientations-on-color-shifting-at-the-border-of-resin-composite-restorations
#12
Yukinori Kano, Masatoshi Nakajima, Asami Aida, Naoko Seki, Richard M Foxton, Junji Tagami
This study aimed to investigate the influence of enamel prism orientations on color adjustment of resin composite restoration. The color measurements (L*, C*, or h* values) at the restored bovine enamel disk (1.0 mm-thick) with resin composite (Estelite Asteria, Estelite Pro, Kalore, Clearfil Majesty) were performed using a CIE XYZ camera (RC500). The color shifting rate and range at the coronal and cervical border were calculated. The coronal border was significantly lower L* and C* color shifting rate than the cervical border (p<0...
December 8, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/29225278/physiochemical-properties-and-resorption-progress-of-porcine-skin-derived-collagen-membranes-in-vitro-and-in-vivo-analysis
#13
Yin-Zhe An, You-Kyoung Kim, Su-Min Lim, Yeong-Ku Heo, Mi-Kyung Kwon, Jae-Kook Cha, Jung-Seok Lee, Ui-Won Jung, Seong-Ho Choi
The aim of the present study was to evaluate the physiochemical properties and resorption progress of two cross-linked, porcine skin-derived collagen membranes and compare their features with those of a membrane without cross-linking (Bio-Gide® [BG], Geistlich Biomaterials, Wolhusen, Switzerland). Three porcine skin-derived collagen membranes, dehydrothermally (DHT) crosslinked (experimental), DHT and 1-ethyl-3(3-dimethylaminopropyl)-carbodiimide (DHT/EDC) cross-linked (experimental) and BG were investigated for their morphology, enzyme resistance, and tensile strength in vitro and biodegradation in vivo...
December 8, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/29225277/evaluation-of-residual-monomer-release-and-toxicity-of-self-adhesive-resin-cements
#14
Aysegul Kurt, Subutay Han Altintas, Mustafa Volkan Kiziltas, Serife Evrim Tekkeli, Eray Metin Guler, Abdurrahim Kocyigit, Aslihan Usumez
The aim of this study was to evaluate the amount of leached residual monomers from self-adhesive resin cements and evaluate their toxicity in-vitro. A total of 60 disk-shaped specimens (5 mm in diameter and 0.5 mm in thickness) were prepared from each cement (RelyX U200, SpeedCEM, G-Cem) (n=20). Specimens were immersed in artificial saliva and the amount of released monomers [urethane dimethacrylate (UDMA) and triethyleneglycol dimethacrylate (TEGDMA)] was identified. Then, the cytotoxicity and genotoxicity effect on cells were evaluated using the defined amounts of released monomers from cements...
December 8, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/29176305/correlations-between-fracture-load-of-zirconia-implant-supported-single-crowns-and-mechanical-properties-of-restorative-material-and-cement
#15
Nadja Rohr, Sabrina Märtin, Jens Fischer
Zirconia implants that were restored with veneered zirconia displayed severe chipping rates of the restorations in clinical studies. Purpose of this study was to evaluate the fracture load of different zirconia implant supported monolithic crown materials (zirconia, alumina, lithium disilicate, feldspar ceramic and polymer-infiltrated ceramic) cemented with various cements (Harvard LuteCem SE, Harvard Implant Semi-permanent, Multilink Automix, VITA Adiva F-Cem). Flexural strength and fracture toughness of crown materials and compressive strength of the cements were measured...
November 23, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/29176304/dual-function-of-proanthocyanidins-as-both-mmp-inhibitor-and-crosslinker-in-dentin-biomodification-a-literature-review
#16
Azadeh Balalaie, Mohammad Bagher Rezvani, Mahshid Mohammadi Basir
Proanthocyanidin, a natural phytochemical bioactive agent, simultaneously can silence the activity of dentinal proteases and crosslink the collagen matrix; both of these phenomena would be the fundamentals for bio-stability of resin-dentin interface which is essential for a promising adhesive dentistry. This review provides an overview of the data developed by different groups of researchers and highlighted topics are proanthocyanidin chemistry, natural resources and the unique interactions between proanthocyanidincollagen and proanthocyanidin-MMPs in dentin...
November 23, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/29176303/comparison-of-enamel-bond-fatigue-durability-between-universal-adhesives-and-two-step-self-etch-adhesives-effect-of-phosphoric-acid-pre-etching
#17
Shunichi Suda, Akimasa Tsujimoto, Wayne W Barkmeier, Kie Nojiri, Yuko Nagura, Toshiki Takamizawa, Mark A Latta, Masashi Miyazaki
The effect of phosphoric acid pre-etching on enamel bond fatigue durability of universal adhesives and two-step self-etch adhesives was investigated. Four universal adhesives and three two-step self-etch adhesives were used. The initial shear bond strengths and shear fatigue strengths to enamel with and without phosphoric acid pre-etching using the adhesives were determined. SEM observations were also conducted. Phosphoric acid pre-etching of enamel was found to increase the bond fatigue durability of universal adhesives, but its effect on two-step self-etch adhesives was material-dependent...
November 23, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/29176302/influence-of-increment-thickness-on-radiant-energy-and-microhardness-of-bulkfill-resin-composites
#18
Gamze Karacolak, L Sebnem Turkun, Hayal Boyacioglu, Jack L Ferracane
Determining the energy transferred at the bottom of eleven bulk-fill resin composites, comparing top and bottom microhardness's and evaluating the correlation between microhardness and radiant energy were aimed. Samples were placed over the bottom sensor of a visible light transmission spectrophotometer and polymerized for 20 s. The bottom and top Knoop microhardness were measured. Paired t-test and correlation analysis were used for statistics (p≤0.05). In all groups, the bottom radiant energy decreased significantly with increasing thickness...
November 23, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/29176301/a-novel-cold-atmospheric-pressure-air-plasma-jet-for-peri-implantitis-treatment-an-in-vitro-study
#19
Yu Yang, Jinsong Guo, Xuan Zhou, Zhiqiang Liu, Chenbao Wang, Kaile Wang, Jue Zhang, Zuomin Wang
Peri-implantitis is difficult to treat in clinical settings; this is not only because it is a site-specific infectious disease but also because it impedes osseointegration. In this study, a novel cold atmospheric pressure air plasma jet (CAPAJ) was applied to study the treatment of peri-implantitis in vitro. CAPAJ treated the samples for 2, 4 and 6 min, respectively. To evaluate the titanium surface characteristics, the surface elemental composition (X-ray photoelectron spectroscopy [XPS]), roughness and hydrophilicity were evaluated in each group...
November 23, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/29176300/effect-of-doxycycline-treated-hydroxyapatite-surface-on-bone-apposition-a-histomophometric-study-in-murine-maxillae
#20
Lin Ding, Peng Zhang, Xin Wang, Jia Hao, Kazuhiro Aoki, Shinji Kuroda, Shohei Kasugai
Improved osseointegration of dental implants is imperative in clinic. Effect of doxycycline on promoting bone formation after implant placement was expected due to its inhibitory properties on inflammation and osteoclastogenesis. To evaluate new bone formation on the hydroxyapatite (HA)-coated implant surface, which was treated with doxycycline, in comparison with the untreated HA surface, half of the HA-coated implants were soaked in doxycycline solution (DOX group) whereas the other HA-coated implants were untreated (HA group)...
November 23, 2017: Dental Materials Journal
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