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Dental Materials Journal

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https://www.readbyqxmd.com/read/30381638/polytetrafluoroethylene-ptfe-a-resin-material-for-possible-use-in-dental-prostheses-and-devices
#1
Takashi Kameda, Kazuo Ohkuma, Shunya Oka
Polytetrafluoroethylene (PTFE) is chemically stable, non-toxic to humans, highly resistant to heat and chemicals, and has an extremely low coefficient of friction. Therefore, PTFE is used in medical applications. We focused on the physical properties of PTFE in relation to its application as a material for use in prostheses and dental devices/instruments. PTFE exhibited low wear (approximately 1/3 that of bovine tooth, and 1/2 that of type III gold alloy), low dynamic friction (approximately 1/5 that of the other specimens), low hardness (4...
November 1, 2018: Dental Materials Journal
https://www.readbyqxmd.com/read/30381637/effect-of-airborne-particle-abrasion-and-acid-and-alkaline-treatments-on-shear-bond-strength-of-dental-zirconia
#2
Blanca I Flores-Ferreyra, Rogelio J Scougall-Vilchis, Ulises Velazquez-Enriquez, Rene Garcia-Contreras, Lizzeth Aguillon-Sol, Oscar F Olea-Mejia
The surface roughness, morphology and shear bond strength (SBS) of dental zirconia using three different surface treatment techniques were evaluated. Three groups of sintered zirconia blocks were treated as follow, 1) Airborne-particle abrasion (APA) group (G1-APA), 50-µm Al2O3; 2) APA and 9% hydrofluoric acid etching (G2-HF); 3) APA and Sodium Hydroxide (G3-NaOH). The specimens were evaluated for roughness [atomic force microscope (AFM)], morphology [Scanning Electron Microscope (SEM)] and for SBS in the universal testing machine...
November 1, 2018: Dental Materials Journal
https://www.readbyqxmd.com/read/30381636/bonding-durability-of-titanium-tetrafluoride-treated-glass-fiber-post-with-resin-cement
#3
Shaymaa E Elsaka, Amr M Elnaghy
This study evaluated the effect of titanium tetrafluoride (TiF4) solution on the bond strength of glass fiber post to resin cement. The specimens were divided into eight groups according to the method of surface treatment performed. Flexural properties and microtensile bond strength (µTBS) were determined. Data were analyzed using two-way ANOVA and Tukey's post hoc tests. The highest µTBS achieved with the TiF4 (4 wt/v%-4 min) group compared with the other groups (p<0.05). This finding could be attributed to the effectiveness of TiF4 (4 wt/v%-4 min) on removing the surface layer of the resin matrix of fiber posts that provides more uncovered surface areas of posts which improved the micromechanical retention of the resin cement...
November 1, 2018: Dental Materials Journal
https://www.readbyqxmd.com/read/30381635/a-review-of-bioceramics-based-dental-restorative-materials
#4
Abdul Samad Khan, Mariam Raza Syed
Currently, much has been published related to conventional resin-based composites and adhesives; however, little information is available about bioceramics-based restorative materials. The aim was to structure this topic into its component parts and to highlight the translational research that has been conducted up to the present time. A literature search was done from indexed journals up to September 2017. The main search terms used were based on dental resin-based composites, dental adhesives along with bioactive glass and the calcium phosphate family...
November 1, 2018: Dental Materials Journal
https://www.readbyqxmd.com/read/30381634/comparison-of-physical-properties-of-three-commercial-composite-core-build-up-materials
#5
Sasinisa Warangkulkasemkit, Piyapanna Pumpaluk
Various materials have been used for core build-up when restoring the coronal portion of the tooth. Currently, bulk-fill resin composites have been produced to restore a large posterior cavity in single increment. This study aimed to evaluate the compressive strength, flexural strength, and microhardness of three commercial composite core build-up materials. All data were analyzed by oneway ANOVA and Tukey test methods (α=0.05). Flexural strength data were subjected to Weibull statistics analysis. All three groups presented significant differences in the compressive strength, flexural strength, and Knoop hardness...
November 1, 2018: Dental Materials Journal
https://www.readbyqxmd.com/read/30381633/effect-of-various-agitation-methods-on-adhesive-layer-formation-of-hema-free-universal-dentin-adhesive
#6
Ji-Hyun Jang, Bong-Ki Jeon, So Yeon Mo, Minjoo Park, Dongseok Choi, Kyoung-Kyu Choi, Duck-Su Kim
This study evaluates the effects of various agitation methods on the adhesive layer formation of a new HEMA-free universal dentin adhesive. The µTBS of the universal adhesive, G-Premio BOND in the self-etch mode was evaluated using three agitation methods [passive agitation (PA), active agitation (AA), ultrasonic agitation (UA)], with and without aging treatment. Two-way analysis of variance revealed that aging treatment was not a statistically significant factor. Tukey's HSD test showed significant differences based on the application method, UA>AA>PA...
November 1, 2018: Dental Materials Journal
https://www.readbyqxmd.com/read/30381632/evaluation-of-discoloration-of-sound-demineralized-root-dentin-with-silver-diamine-fluoride-in-vitro-study
#7
Mahmoud Sayed, Naoko Matsui, Noriko Hiraishi, Go Inoue, Toru Nikaido, Michael F Burrow, Junji Tagami
The objective was to evaluate the effect of application of silver diamine fluoride (SDF) on discoloration of demineralized dentin over time. Dentin specimens were divided into four groups according to time of dentin demineralization. A 38% SDF solution was then applied to the dentin surfaces. Half of the specimens were placed in light-proof boxes while the remainder were exposed to light. Both groups were maintained at 37˚C. Color change was determined using a spectrophotometer at different time intervals...
November 1, 2018: Dental Materials Journal
https://www.readbyqxmd.com/read/30381631/fracture-behaviors-of-maxillary-central-incisors-with-flared-root-canals-restored-with-cad-cam-integrated-glass-fiber-post-and-core
#8
Jianliang Pang, Changfen Feng, Xiaoru Zhu, Bing Liu, Tianzheng Deng, Yuan Gao, Ying Li, Jie Ke
The objective was to evaluate the fracture resistance properties of maxillary incisors with flared canals restored with computer aided design and computer aided manufacture (CAD/CAM) integrated glass fiber post-and-core. Thirty prepared flared root canals were selected in vitro and restored with CAD/CAM integrated fiber post-and-core (Group A), prefabricated fiber posts (Group B), and cast gold alloy (Group C), respectively. After submitted to fatigue loading, each specimen was subjected to a static loading until fracture...
November 1, 2018: Dental Materials Journal
https://www.readbyqxmd.com/read/30381630/proximal-contact-tightness-of-class-%C3%A2-bulk-fill-composite-resin-restorations-an-in-vitro-study
#9
Hassan El-Shamy, Helal Sonbul, Najlaa Alturkestani, Abeer Tashkandi, Bas Ac Loomans, Christof Dörfer, Wafa El-Badrawy
This study investigated the effect of bulk-fill composites on proximal contact tightness (PCT) of composite restorations using different matrix systems. 150/standardized-MO-ivorine cavity preparations were divided into 5 groups; Smart Dentin Replacement (SDR), SonicFill (SF), Tetric EvoCeram Bulk-Fill (TEB), G-ænial Universal Flo (GF) and Tetric EvoCeram (TE). Each group was subdivided into 3 sub-groups (n=10); Dixieland band in Tofflemire retainer, FenderMate and Palodent plus matrix systems. PCT was measured 24 h post-curing using Tooth Pressure Meter...
November 1, 2018: Dental Materials Journal
https://www.readbyqxmd.com/read/30298860/microtensile-bond-strengths-of-adhesively-bonded-polymer-based-cad-cam-materials-to-dentin
#10
Nuray Capa, Esra Can Say, Cansin Celebi, Ayca Casur
This in vitro study aimed to evaluate the effect of two different polymer-based CAD/CAM materials; resin-nano ceramic (Lava Ultimate [LVU]) and composite (CERASMART [CS]), their different surface pre-treatments, and use of different resin cements on the µTBS of adhesively bonded CAD/CAM onlays to dentin. CAD/CAM materials were cut into slabs and divided into five groups according to the surface pre-treatments applied: Silane Primer, OptiBond XTR adhesive, Silane Primer+OptiBond XTR adhesive, Single Bond Universal (SBU), and RelyX Ceramic Primer+SBU...
October 5, 2018: Dental Materials Journal
https://www.readbyqxmd.com/read/30298859/microhardness-of-bovine-enamel-after-different-fluoride-application-protocols
#11
Marcia Regina Cabral Oliveira, Pedro Henrique Cabral Oliveira, Luiz Henrique Cabral Oliveira, Anna Carolina Ratto Tempestini Horliana, Paulo Francisco César, Sandra Kiss Moura, Sandra Kalil Bussadori
The aim of the present study was to evaluate microhardness, mineral recovery and the enamel surface after the application of topical fluoride to artificial dental caries. Twenty-five bovine enamel blocks were prepared for artificial caries-like lesions and randomly divided into five groups (n=5): untreated (C control), 1.23% acidulated phosphate fluoride gel (APG), 2% neutral fluoride gel (NFG), 1.23% acidulated fluoride mousse (AFM) and fluoride varnish (5% Duraphat, DFV). Knoop microhardness (KHN) was evaluated after 7 and 14 days of treatment as well as 1 week after 28 days of treatment...
October 5, 2018: Dental Materials Journal
https://www.readbyqxmd.com/read/30298858/ultrastructure-and-bonding-properties-of-tribochemical-silica-coated-zirconia
#12
Noriyuki Nagaoka, Kumiko Yoshihara, Yoshiyuki Tamada, Yasuhiro Yoshida, Bart Van Meerbeek
Tribochemical silica coating (TSC) is commonly used to pretreat zirconia surfaces prior to luting. Although many studies demonstrate an adhesion-promoting effect of TSC on zirconia, its actual interaction mechanism has not been fully elucidated. We therefore characterized the ultrastructure of TSC-treated zirconia and tested shear-bond strength. STEM/EDS disclosed a micro-roughened zirconia surface partially covered with fused Al and Si, while residual unfused silica particles could also still be detected. TSCtreated zirconia having received the solely silane primer exhibited a significantly lower shear-bond strength than zirconia on which the combined 10-MDP/silane primer was applied...
October 5, 2018: Dental Materials Journal
https://www.readbyqxmd.com/read/30298857/structural-and-long-term-mechanical-properties-from-a-resin-modified-glass-ionomer-cement-after-various-delays-of-light-activation
#13
Marianne Lagarde, Philippe Francois, Stéphane le Goff, Jean-Pierre Attal, Elisabeth Dursun
This study aimed, after various delays of light-activation, to examine the microstructure of a resin-modified glass ionomer cement (RMGIC) by scanning electron microscopy (SEM) and to test its mechanical properties in short and long term. Five groups of Fuji II LC were investigated with different light-curing protocols. For each, SEM observations were undertaken with etched samples to selectively observe the organic polymer phase. Flexural strength and microhardness were also tested after 24 h and 12 months storage...
October 5, 2018: Dental Materials Journal
https://www.readbyqxmd.com/read/30298856/changes-in-the-physical-properties-and-color-stability-of-aesthetic-restorative-materials-caused-by-various-beverages
#14
Ji-Won Choi, Myung-Jin Lee, Sang-Hwan Oh, Kwang-Mahn Kim
This study investigates the effects of various beverages on the wettability, microhardness, and color stability of aesthetic dental restorative materials. A contact angle analyzer, Vickers hardness tester, and spectrophotometer were used to characterize the properties of the materials and a total of 225 specimens were prepared: 75 each for a resin composite, compomer, and giomer. Ingestion of energy drinks and cola caused the greatest deterioration in wettability and microhardness, and coffee caused the most significant color change...
October 5, 2018: Dental Materials Journal
https://www.readbyqxmd.com/read/30298855/effect-of-kinematic-viscosity-on-the-staining-performance-of-caries-detector-dyes
#15
Mikihiro Kobayashi, Rina Inagaki, Kotona Ichikawa, Yuiko Niizuma, Hirobumi Morisaki, Hirotaka Kuwata, Atsufumi Manabe, Takashi Miyazaki
The relationship between performance of caries detector dyes and solvent molecular weight has been reported, but viscosity has not yet been investigated. Therefore, using extracted human teeth, we compared 6 experimental caries detector dyes with different viscosities to clarify the relationship between dye viscosity and staining performance in sclerotic dentin. Carious dentin started showing dentin staining when stained with caries detector dyes with kinematic viscosity≥263 mm2 /s, showed no immunoreactivity for Streptococcus mutans on immunohistochemistry, and contained dentinal tubules free of debris on scanning electron microscopy...
October 5, 2018: Dental Materials Journal
https://www.readbyqxmd.com/read/30298854/effects-of-different-resin-sealing-therapies-on-nanoleakage-within-artificial-noncavitated-enamel-lesions
#16
Soley Arslan, Linda Lipski, Keegan Dubbs, Ferhan Elmali, Fusun Ozer
The aim of this study was to evaluate nanoleakage within the different lesion-sealing therapies applied to artificial non-cavitated enamel lesions. Thirty-two human anterior teeth were used. Artificial subsurface enamel lesions were produced on the labial surfaces of teeth. The specimens were then randomly divided into three groups (n=10): Group I- Clinpro Sealant application; Group II- ExciTE F adhesive resin application; and Group III- ICON resin infiltrant application. Each group was further divided into two subgroups: control and thermocycler...
October 5, 2018: Dental Materials Journal
https://www.readbyqxmd.com/read/30224604/five-axis-laser-milling-system-that-realizes-more-accurate-zirconia-cad-cam-crowns-by-direct-milling-from-fully-sintered-blocks
#17
Kazuo Ohkuma, Takashi Kameda, Kazuto Terada
Directly milling zirconia computer-aided design (CAD)/computer-aided manufacturing (CAM) crowns from fully sintered zirconia blocks using a five-axis laser milling system, compared with three-axis milling and full sintering by heating milled semi-sintered crowns, was investigated. The mechanical characteristics of zirconia specimens were similar across groups. The order of the marginal gap was three-axis>conventional (lingual thickness of 1.5 mm>0.5 mm)>five-axis group (close to zero). The marginal shape was almost perfectly circular in all groups...
September 14, 2018: Dental Materials Journal
https://www.readbyqxmd.com/read/30224603/effects-of-silver-diammine-fluoride-on-bond-strength-of-adhesives-to-sound-dentin
#18
Paul Lutgen, Daniel Chan, Alireza Sadr
This study evaluated bonding of adhesives to dentin treated with silver diammine fluoride (SDF). Micro-shear bond strength (MSBS) to sound human dentin was investigated for 3 adhesive systems: Clearfil SE bond 2 (CSE), and Scotchbond Universal in self-etching (SBU) and phosphoric acid-etching (SBT) modes, following 4 different SDF application protocols (n=10); Control: treated with deionized water. P1: SDF applied for 10-s, no rinse. P2: SDF applied for 10-s, rinsed off after 1-min. P3: superficial dentin polished off after 24-h following P1...
September 14, 2018: Dental Materials Journal
https://www.readbyqxmd.com/read/30224601/effects-of-silicate-based-composite-material-on-the-proliferation-and-mineralization-behaviors-of-human-dental-pulp-cells-an-in-vitro-assessment
#19
Tiantian Wu, Chen Xu, Rong DU, Yang Wen, Jiang Chang, Zhiguang Huan, Yaqin Zhu
The objective of this study was to investigate the effects of a silicate-based composite material on proliferation and mineralization of human dental pulp cells (hDPCs), which was compared with those of calcium hydroxide (Ca(OH)2 , CH) and tricalcium silicate (Ca3 SiO5 , C3S). HDPCs were cultured with CH, C3S and tricalcium silicate/dicalcium silicate (Ca3 SiO5 /Ca2 SiO4 , C3S/C2S) composites extract. The CCK-8 assay showed that the composite material stimulated the proliferation of hDPCs. The odontogenic marker genes and DSPP protein expression were more significantly up-regulated by the C3S/C2S composite material compared with pure CH and C3S...
September 14, 2018: Dental Materials Journal
https://www.readbyqxmd.com/read/30224600/the-application-of-cellulose-acetate-replication-sheets-in-enamel-wear-investigations
#20
Manhal Ijbara, Kanae Wada, Junichiro Wada, Jayanetti Asiri Jayawardena, Michiyo Miyashin
Surface replication is a nondestructive evaluation technique applied in examining surfaces' cracks/wear. This is quite valuable when the surface of interest cannot be further manipulated by cutting or polishing to fit directly under a microscope. Replication by acetate sheets is one of the techniques applied in industrial, metallographic and anthropological wear/examination. Enamel is the outermost protective layer of human teeth and is subjected to mechanical stresses due to the masticatory function; thus, wear is inevitable in human teeth...
September 14, 2018: Dental Materials Journal
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