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Dental Materials Journal

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https://www.readbyqxmd.com/read/27773896/a-comparative-study-of-the-susceptibility-of-cut-and-uncut-enamel-to-erosive-demineralization
#1
Wa Than Lin, Yuichi Kitasako, Syozi Nakashima, Junji Tagami
This study aimed to evaluate the susceptibility of cut and uncut enamel surfaces to an erosive challenge and to examine the resultant characteristics/morphological changes. Ten extracted human incisors were used for preparation of enamel samples, and samples were immersed in citric acid. After 3 (total 3 min) and 6 cycles (total 6 min) of erosive challenges, surface loss (SL) and morphological changes were measured using scanning microscopy and FIB-TEM. Ca release (CA) and surface hardness (SH) were measured using a calcium-sensitive electrode and hardness tester respectively...
October 22, 2016: Dental Materials Journal
https://www.readbyqxmd.com/read/27773894/calcium-silicate-based-cements-and-functional-impacts-of-various-constituents
#2
Mohammad Ali Saghiri, Jafar Orangi, Armen Asatourian, James L Gutmann, Franklin Garcia-Godoy, Mehrdad Lotfi, Nader Sheibani
Calcium silicate-based cements have superior sealing ability, bioactivity, and marginal adaptation, which make them suitable for different dental treatment applications. However, they exhibit some drawbacks such as long setting time and poor handling characteristics. To overcome these limitations calcium silicates are engineered with various constituents to improve specific characteristics of the base material, and are the focus of this review. An electronic search of the PubMed, MEDLINE, and EMBASE via OVID databases using appropriate terms and keywords related to the use, application, and properties of calcium silicate-based cements was conducted...
October 22, 2016: Dental Materials Journal
https://www.readbyqxmd.com/read/27773895/microtensile-bond-strength-between-a-udma-fiber-post-and-different-resin-cements-effect-of-pre-surface-treatment
#3
Renato Cassio Roperto, Thiago Soares Porto, Lisa Lang, Sorin Teich, Sean Weber, Omar El-Mowafy, Sizenando Toledo Porto-Neto
During a fiber post cementation, bonding failure often occurs at the junction between the fiber-post and resin-cement. Because this failure requires better characterization, we evaluated if different post surface treatment can affect the bond strength of urethane dimethacrylate (UDMA) fiber-posts with resin-cements. Three groups were created: G1: no treatment/silane; G2: ethyl alcohol (96° GL)/silane; G3: 24% H2O2/silane and further divided into four subgroups: I-Unicem/3MESPE; II-BisCem/Bisco; III-Panavia SA/Kuraray and IV-DuoLink/Bisco...
December 1, 2016: Dental Materials Journal
https://www.readbyqxmd.com/read/27725368/effects-of-c-factor-on-bond-strength-to-floor-and-wall-dentin
#4
Takako Yoshikawa, Alireza Sadr, Junji Tagami
This study evaluated the effect of C-factor on the bond strength of a resin composite to floor and wall dentin using two adhesive systems. Box-form cavities were prepared on human molars, following the walls of half of the cavities were removed to create flat dentin surfaces for bonding. Each specimen was then restored using one of two adhesives (Clearfil SE Bond or Clearfil tri-S Bond) and filled or built up using Z100 resin composite. After light-curing, the specimen was cut perpendicular to the bonded surface parallel to the floor or wall to obtain beams...
December 1, 2016: Dental Materials Journal
https://www.readbyqxmd.com/read/27725367/influence-of-eccentric-cyclic-loading-on-implant-components-comparison-between-external-joint-system-and-internal-joint-system
#5
Kei Sakamoto, Shinya Homma, Takuya Takanashi, Shinji Takemoto, Yoshitaka Furuya, Masao Yoshinari, Yasutomo Yajima
The purpose of this in vitro study was to investigate the influence of eccentric loading on implant components by measuring screw loosening and observing these components under several load positions and magnitudes. The external and internal joint system implants with butt joint connection were subjected to cyclic loading tests according to the specifications of ISO 14801. Load position was set at 0, 4, or 8 mm, and load was set at 100 or 300 N. On the external joint system, the reverse torque values decreased with distal shift in the loading position and an increase in magnitude of load, and abrasion and deformation on the anti-rotation device were observed...
December 1, 2016: Dental Materials Journal
https://www.readbyqxmd.com/read/27725366/bonding-effectiveness-of-composite-dentin-interfaces-after-mechanical-loading-with-a-new-device-rub-roll
#6
Anelise Fernandes Montagner, Niek J Opdam, Jan L Ruben, Maximiliano Sérgio Cenci, Marie-Charlotte Huysmans
This study evaluated the effect of mechanical loading with a new device on the microtensile bond strength (µTBS) of adhesive systems to dentin. Forty molars were divided according to adhesive systems: self-etch (Clearfil(TM) SE Bond -CSE) and etch-and-rinse (Adper Scotchbond(TM) 1XT -ASB); and to aging (n=5): control; MC1-250,000; MC2-500,000; and MC3-750,000 mechanical cycles. Microtensile bond strength was measured and fracture modes were analyzed. Data for µTBS were subjected to Kruskal-Wallis and post hoc tests (p<0...
December 1, 2016: Dental Materials Journal
https://www.readbyqxmd.com/read/27725365/marginal-integrity-of-resin-composite-restorations-restored-with-ppd-initiatorcontaining-resin-composite-cured-by-qth-monowave-and-polywave-led-units
#7
Tissiana Bortolotto, Francisco Betancourt, Ivo Krejci
This study evaluated the influence of curing devices on marginal adaptation of cavities restored with self-etching adhesive containing CQ and PPD initiators and hybrid composite. Twenty-four class V (3 groups, n=8) with margins located on enamel and dentin were restored with Clearfil S3 Bond and Clearfil APX PLT, light-cured with a monowave LED, multiwave LED and halogen light-curing unit (LCU). Marginal adaptation was evaluated with SEM before/after thermo-mechanical loading (TML). On enamel, significantly lower % continuous margins (74...
December 1, 2016: Dental Materials Journal
https://www.readbyqxmd.com/read/27680036/fracture-toughness-of-seven-resin-composites-evaluated-by-three-methods-of-mode-i-fracture-toughness-kic
#8
Ayse Mese, Joseph Ea Palamara, Rafat Bagheri, Mehdi Fani, Michael F Burrow
This study compared the fracture toughness values of seven resin composites and analyzed the consistency of data values using three methods: compact tension, three point and four point bending for Mode I failure. Seven resin composites were selected: Estellite Sigma Quick, Esthet X HD, Filtek Supreme XTE, Heliomolar, Ice, Rok, and Vit-l-escence. For each material, 18 specimens (n=6 for each test) were prepared. Maximum load to failure was recorded using a universal testing machine and fracture toughness was calculated...
December 1, 2016: Dental Materials Journal
https://www.readbyqxmd.com/read/27680035/epigallocatechin-3-gallate-increased-the-push-out-bond-strength-of-an-epoxy-resin-sealer-to-root-dentin
#9
Suthida Pheenithicharoenkul, Anchana Panichuttra
This study aimed to investigate the effect of epigallocatechin-3-gallate (EGCG) from green tea extract on the push out bond strength of an epoxy resin sealer to root dentin. Seventy single root canal premolars were decoronated and instrumented. The roots were randomly irrigated with different final irrigation protocols (n=16): 17%EDTA (EDTA), 17%EDTA followed by 2.5%NaOCl (EDTA+NaOCl), 17%EDTA followed by 1 mg/mL EGCG (EDTA+EGCG) and 1 mg/mL EGCG (EGCG). Other six root canals were received only 2.5%NaOCl as a control group...
December 1, 2016: Dental Materials Journal
https://www.readbyqxmd.com/read/27680034/development-and-modification-of-a-device-for-three-dimensional-measurement-of-orthodontic-force-system-the-v-bend-system-re-visited
#10
WeiJen Lai, Yoshiyuki Midorikawa, Zuisei Kanno, Hiroshi Takemura, Kazuhiro Suga, Kohei Soga, Takashi Ono, Motohiro Uo
We developed a device to evaluate the orthodontic force applied by systems requiring high operability. A life-sized, two-tooth model was designed, and the measurements were performed using a custom-made jointed attachment, referred to as an "action stick", to allow clearance for the oversized six-axis sensors. This tooth-sensor apparatus was accurately calibrated, and the error was limited. Vector analysis and rotating coordinate transformation were required to derive the force and moment at the tooth from the sensor readings...
December 1, 2016: Dental Materials Journal
https://www.readbyqxmd.com/read/27680033/shear-bond-strength-of-a-novel-light-cured-calcium-silicate-based-cement-to-resin-composite-using-different-adhesive-systems
#11
Hanan Alzraikat, Nessrin A Taha, Deema Qasrawi, Michael F Burrow
The shear bond strength (SBS) of TheraCal LC to resin composite was evaluated in comparison to Mineral trioxide aggregate (ProRoot MTA) and conventional glass ionomer cement (GIC) using two adhesive systems. A hole was prepared in 90 acrylic blocks (6 mm diameter, 2 mm deep) then filled with TheraCal LC, MTA or Fuji IX (n=30/group). Each group was bonded with either an etch and rinse or 1-step self-etch adhesive. Filtek Z250 composite was bonded to each capping material. Bond strength was tested in a universal testing machine, and data were analyzed using 2-way ANOVA and Duncan's Multiple range test (p<0...
December 1, 2016: Dental Materials Journal
https://www.readbyqxmd.com/read/27680032/characterization-and-angiogenic-potential-of-xenogeneic-bone-grafting-materials-role-of-periodontal-ligament-cells
#12
Charlotte Rombouts, Charlotte Jeanneau, Josette Camilleri, Patrick Laurent, Imad About
Adequate revascularization is a prerequisite for successful healing of periodontal bone defects. This study characterized three different xenogeneic bone grafting materials: Gen-Os of equine and porcine origins, and anorganic Bio-Oss. We also investigated their angiogenic potential. All materials were composed of poorly crystalline calcium oxide phosphate, with Bio-Oss exhibiting a carbonated phase and larger particle size and both Gen-Os showing the presence of collagen. Both Gen-Os materials significantly enhanced vascular endothelial growth factor (VEGF) secretion by PDL cells...
December 1, 2016: Dental Materials Journal
https://www.readbyqxmd.com/read/27546859/opalescence-of-human-teeth-and-dental-esthetic-restorative-materials
#13
Yong-Keun Lee
Human tooth enamel is opalescent, which renders teeth bluish in reflected and orange in transmitted color. The aim was to review opalescent property of teeth and application and mimetic reproduction in esthetic restorations. A PubMed search for articles published in English till 2015 on the opalescence of teeth and esthetic materials revealed 29 relevant papers. Opalescence was measured with OP-RT index, which was calculated as the difference in the yellow-blue and red-green color coordinates between the reflected and transmitted colors...
December 1, 2016: Dental Materials Journal
https://www.readbyqxmd.com/read/27546857/the-marginal-fit-of-e-max-press-and-e-max-cad-lithium-disilicate-restorations-a-critical-review
#14
Radek Mounajjed, Danielle M Layton, Basel Azar
This critical review aimed to assess the vertical marginal gap that was present when E.max lithium disilicate-based restoration (Press and CAD) are fabricated in-vitro. Published articles reporting vertical marginal gap measurements of in-vitro restorations that had been fabricated from E.Max lithium disilicate were sought with an electronic search of MEDLINE (PubMed) and hand search of selected dental journals. The outcomes were reviewed qualitatively. The majority of studies that compared the marginal fit of E...
December 1, 2016: Dental Materials Journal
https://www.readbyqxmd.com/read/27150678/research-on-a-novel-chitosan-microsphere-scaffold-system-by-double-crosslinkers
#15
Gang Zhou, Xin Yu, Jun Tai, Fengyu Han, Ming Yan, Yuan Xi, Meili Liu, Qianfan Wu, Yubo Fan
RhBMP-2 has shown great promise for the reconstruction of teeth segmental bone defects due to its osteoinductive properties. But the application of rhBMP-2 is limited by its weak drug controled release. It is usually loaded in a Chitosan Microspheres (CMs) delivery system with excess single cross-linker and then removed before practice. In this study, cross-linkers were replaced with RhBMP-2 which contains vanillin and vitriolic acid, and thus CMs were developed. The materials were studied by SEM, FTIR and drug release experiments...
December 1, 2016: Dental Materials Journal
https://www.readbyqxmd.com/read/27546861/dentin-bond-strength-of-two-resin-ceramic-computer-aided-design-computer-aided-manufacturing-cad-cam-materials-and-five-cements-after-six-months-storage
#16
Simon Flury, Stefanie Zita Schmidt, Anne Peutzfeldt, Adrian Lussi
The aim was to investigate dentin bond strength of two resin-ceramic materials and five cements after 24 h and six months storage. Cylinders (n=15/group) of Lava Ultimate (3M ESPE) and VITA ENAMIC (VITA Zahnfabrik) were cemented to mid-coronal dentin of 300 extracted human molars with RelyX Ultimate (3M ESPE), PANAVIA F2.0 (Kuraray), Variolink II (Ivoclar Vivadent), els cem (Saremco Dental), or Ketac Cem Plus (3M ESPE). Shear bond strength (SBS) was measured after 24 h or six months storage (37°C, 100% humidity) and statistically analyzed (significance level: α=0...
October 1, 2016: Dental Materials Journal
https://www.readbyqxmd.com/read/27546860/effect-of-placement-technique-on-the-push-out-bond-strength-of-calcium-silicate-based-cements
#17
Selen Küçükkaya Eren, Hacer Aksel, Ahmet Serper
The purpose of this study was to evaluate the effects of ultrasonic and manual placement techniques on the push-out bond strength of Biodentine and MTA with and without calcium chloride. One hundred and twenty mid-root slices from forty freshly extracted single-rooted human mandibular premolar teeth were instrumented and randomly divided into six groups (n=20) according to the filling material and placement technique applied, as follows: G1: MTA-manual compaction, G2: Biodentine-manual compaction, G3: MTA+5% CaCl2-manual compaction, G4: MTA-ultrasonic activation, G5: Biodentine-ultrasonic activation, G6: MTA+5% CaCl2-ultrasonic activation...
October 1, 2016: Dental Materials Journal
https://www.readbyqxmd.com/read/27546858/the-zirconia-reinforced-lithium-silicate-ceramic-lights-and-shadows-of-a-new-material
#18
Tonino Traini, Bruna Sinjari, Romeo Pascetta, Nicola Serafini, Giorgio Perfetti, Paolo Trisi, Sergio Caputi
This study aims to investigate the mechanical properties, composition and surface preparation for adhesive bonding of the recently introduced zirconia-reinforced lithium silicate (ZLS) glass-ceramic. One single block of ZLS was used to prepare the specimens (n=14). The fracture toughness (Ft) and the Vickers hardness (HV) were measured on specimens partially crystallized (PCs) (n=4) and fully crystallized (FCs) at 840°C for 8 min (n=4). The surface treatment was done using hydrofluoric-acid gel (HF) at different concentrations and times of action on FCs specimens (n=4)...
October 1, 2016: Dental Materials Journal
https://www.readbyqxmd.com/read/27546856/bioactive-glass-based-nanocomposites-for-personalized-dental-tissue-regeneration
#19
Jung-Hwan Lee, Seog-Jin Seo, Hae-Won Kim
Bioactive glass nanoparticles (BGNs) have been used over a range of dental tissue engineering. One main reason is possibly that BGNs strongly interact with hard tissues, while forming a stable interface after implantation. Recently, BGNs have been further diversified and ameliorated by incorporating bio-functional ions into BGNs or by functionally modifying the surface of BGNs. A comprehensive overview of the processes and applications of BGNs and their derivatives for the use in dentistry is thus necessary for their stepforward...
October 1, 2016: Dental Materials Journal
https://www.readbyqxmd.com/read/27546855/effects-of-zinc-fluoride-on-inhibiting-dentin-demineralization-and-collagen-degradation-in-vitro-a-comparison-of-various-topical-fluoride-agents
#20
Ornnicha Thanatvarakorn, Md Sofiqul Islam, Syozi Nakashima, Alireza Sadr, Toru Nikaido, Junji Tagami
Root caries is developed because of demineralization followed by enzymatic collagen degradation. This in vitro study aimed to examine the inhibitory efficacy of ZnF2 on dentin demineralization and collagen degradation. Bovine dentin specimens were treated either with ZnF2 or HCl-acidified ZnF2 (ZnF2/HCl) and then demineralized. Anti-demineralization efficacy was assessed by TMR as mineral loss (ΔZ). The efficacy was compared with silver diammine fluoride (SDF), KF, and acidulated phosphate fluoride (APF). For evaluating anti-collagen degradation, EDTA-demineralized dentin specimens were treated by one of four fluoride agents [SDF, APF, ZnF2/HCl, NaF] followed by collagenase challenge...
October 1, 2016: Dental Materials Journal
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