Long-term evaluation of water sorption and ultimate tensile strength of HEMA-containing/-free one-step self-etch adhesives

2011 ◽  
Vol 39 (7) ◽  
pp. 506-512 ◽  
Author(s):  
Masahiro Takahashi ◽  
Masatoshi Nakajima ◽  
Keiichi Hosaka ◽  
Masaomi Ikeda ◽  
Richard M. Foxton ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Water Sorption ◽  
Term Evaluation ◽  
One Step ◽  
Self Etch

scholarly journals Ultimate tensile strength of total and self-etch adhesives: Effect of light irradiation distance.

2019 ◽  
Vol S (1) ◽  
pp. 44-47
Author(s):  
Maan M. Nayif ◽  
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Testing Machine ◽  
Adhesive System ◽  
Light Irradiation ◽  
Adhesive Systems ◽  
Failure Data ◽  
One Step ◽  
Self Etch ◽  
Effect Of Light

Objective: To evaluate the ultimate tensile strength (UTS) of total and self- etch adhesives irradiated at different distances. Materials and Methods: Sixty cylindrical specimens of 0.78mm diameter and 10 mm length were prepared of two types of adhesive systems total etch Excite DSC (EX – Ivoclar Vivadent, Schaan, Liechtenstein) and one-step self-etch Clearfil S3 Bond (S3, Kuraray Medical Inc., Tokyo, Japan). Specimens of each adhesive were divided into three groups according to the light irradiation distance (0, 2, 4mm) (n=10). Each specimen was attached to universal testing machine (Digital Force Gauge, IMADA CO., LTD, Japan) and loaded at cross head speed of 1mm/min until failure. Data were analyzed using two-way ANOVA and Independent Student t-test at p< 0.05. Results: Mean UTS for total etch (24.63, 18.19, 17.26 Mpa) and for self-etch (12.68, 8.53, 7.58Mpa) at (0, 2, 4mm) distances. Specimens irradiated directly show significantly the highest UTS while those irradiated at 4mm show the lowest values (p<0.05). Excite DSC total etch adhesive have higher UTS than Clearfil S3 self-etch adhesive regardless of irradiation distance (p<0.05).Conclusions: The UTS of the evaluated adhesives was light irradiation distance and adhesive system dependant.

Effect of Cyclic Loading on the Microtensile Bond Strengths of Total-etch and Self-etch Adhesives

2006 ◽  
Vol 31 (1) ◽  
pp. 25-32 ◽  
Author(s):  
M. Toledano ◽  
R. Osorio ◽  
A. Albaladejo ◽  
F. S. Aguilera ◽  
F. R. Tay ◽  
...  
Keyword(s):  
Cyclic Loading ◽  
Clinical Relevance ◽  
Acid Etching ◽  
One Step ◽  
Bond Strengths ◽  
Self Etch ◽  
Etching System ◽  
Better Than

Clinical Relevance Resin-dentin bonds, which may have an influence on the long-term success of restorations, are prone to deterioration after cyclic loading. The tested one-step self-etching system (Etch&Prime 3.0) provided the least reliable dentin adhesion. After acid etching of dentin, alcohol/based adhesives performed better than those containing acetone as solvent.

scholarly journals Can extended photoactivation time of resin-based fissure sealer materials improve ultimate tensile strength and decrease water sorption/solubility?

2012 ◽  
Vol 06 (04) ◽  
pp. 402-407
Author(s):  
Boniek Castillo Dutra Borges ◽  
Eduardo José Souza-Júnior ◽  
Anderson Catelan ◽  
Luís Alexandre Maffei Sartini Paulillo ◽  
Flávio Henrique Baggio Aguiar
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Physical Properties ◽  
Water Sorption ◽  
Testing Machine ◽  
Constant Mass ◽  
Fissure Sealant ◽  
Significant Difference ◽  
Materials Used ◽  
The Impact

ABSTRACTObjective: This study aimed to evaluate the impact of extended photoactivation time on ultimate tensile strength (UTS), water sorption (WS) and solubility (WSB) of resin-based materials used as fissure-sealantsMethods: A fissure-sealant (Fluroshield) and a flowable composite (Permaflo) polymerized for 20 and 60 seconds were tested. For UTS, 20 hourglass shaped samples were prepared representing two materials and two photoactivation time (n=5). After 24-h dry-storage, samples were tested in tension using a universal testing machine at a cross-head speed of 0.5 mm/min (UTS was calculated in MPa). For WS and WSB, 20 disks with 5 mm diameter and 1 mm height (n=5) were prepared and volumes were calculated (mm3). They were transferred to desiccators until a constant mass was obtained (m1) and were subsequently immersed in distilled water until no alteration in mass was detected (m2). Samples were reconditioned to constant mass in desiccators (m3). WS and WSB were determined using the equations m2-m3/V and m1-m3/V, respectively. Data were subjected to twoway ANOVA and Tukey’s HSD test (P<.05).Results: There was no significant difference between materials or photoactivation times for the UTS and WS. Permaflo presented lower but negative WSB compared to Fluroshield.Conclusions: Extended photoactivation time did not improve the physical properties tested. Fluroshield presented physical properties that were similar to or better than Permaflo. (Eur J Dent 2012;6:402-407)

scholarly journals Influence of pre-heating and ceramic thickness on physical properties of luting agents

2018 ◽  
Vol 16 (4) ◽  
pp. 252-259 ◽  
Author(s):  
Michele O Lima ◽  
Anderson Catelan ◽  
Giselle M Marchi ◽  
Débora ANL Lima ◽  
Luís RM Martins ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Physical Properties ◽  
Water Sorption ◽  
Knoop Hardness ◽  
Cross Link ◽  
Luting Agents ◽  
Link Density ◽  
Cross Link Density ◽  
Ceramic Thickness

Purpose: The objective of this in vitro study was to evaluate the influence of ceramic thickness and pre-heating of luting agents on their physical properties. Materials and methods: The materials RelyX Arc, RelyX Ultimate, RelyX Veneer, and Filtek Z350 Flow were handled at different temperatures (23°C or 54°C), inserted into matrix, and photoactivated through ceramic disks (0.75 mm or 1.5 mm). The following tests were performed ( n=8): degree of conversion, Knoop Hardness, cross-link density, water sorption, solubility, and ultimate tensile strength. Data were analyzed using three-way analysis of variance and Tukey’s test (α=0.05). Results: Regarding ceramic thickness, the thinnest ceramic resulted in higher values of Knoop Hardness ( p=0.027). The lowest temperature (23°C) resulted in a higher solubility ( p=0.0257), and water sorption ( p=0.0229) values. There was also statistical difference among the materials: RelyX Arc showed a higher degree of conversion and ultimate tensile strength, followed by RelyX Veneer, RelyX Ultimate, and Filtek Z350 Flow. For Knoop Hardness and cross-link density tests, RelyX Ultimate showed the highest values, followed by RelyX Arc, RelyX Veneer, and Filtek Z350 Flow. For water sorption and solubility, RelyX Veneer showed the highest values, followed by RelyX Arc, RelyX Ultimate, and Filtek Z350 Flow. Conclusion: Pre-heating interfered with water sorption and solubility, whereas ceramic thickness only affected Knoop Hardness; the physical properties of the materials are dependent on their composition.

Microstructure and Tensile Properties of a 1.25Cr-0.5Mo Main Steam Pipe After Long-Term Service

2018 ◽  
Author(s):  
Bin Yang ◽  
Wen-Chun Jiang ◽  
Wen-Qi Sun ◽  
Yan-Ling Zhao ◽  
Wei-Ya Zhang
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Tensile Properties ◽  
Yield Stress ◽  
Tensile Deformation ◽  
High Yield ◽  
Micro Hardness ◽  
Steam Pipe ◽  
Main Steam

Metallographic tests, micro-hardness tests and tensile tests were conducted for a 1.25Cr-0.5Mo main steam pipe weldment served for more than 26 years. The results were compared with those for virgin material. Microstructural evolution of 1.25Cr-0.5Mo base metal was investigated. Degradation in micro-hardness and tensile properties were also studied. In addition, the tensile properties of subzones in the ex-service weldment were characterized by using miniature specimens. The results show that obvious microstructural changes including carbide coarsening, increasing inter lamella spacing and grain boundary precipitates take place after long-term service. Degradation in micro-hardness is not obvious. However, the effects of long term service on tensile deformation behavior, ultimate tensile strength and yield stress are remarkable. Based on the yield stress of micro-specimens, the order of different subzones is: WM > HAZ > BM, which is consistent with the order of different subzones based on micro-hardness. However, the ultimate tensile strength and fracture strain of HAZ are lower than BM. Brittle failures can happen more easily for HAZ due to its high yield ratio.

Relationship Between Mechanical Properties and Collagen Structure of Closed and Open Wounds

1988 ◽  
Vol 110 (4) ◽  
pp. 352-356 ◽  
Author(s):  
Charles J. Doillon ◽  
Michael G. Dunn ◽  
Frederick H. Silver
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Collagen Fiber ◽  
Fiber Diameter ◽  
Normal Skin ◽  
Collagen Fibers ◽  
Collagen Structure ◽  
Collagen Network

Mechanical properties and collagen structure of excisional wounds left open are compared with wounds closed by clips. In both wound models, collagen fiber diameter increases with time post-wounding and is related to tensile strength. Clipped wounds show a higher ultimate tensile strength and tangent modulus compared with open wounds. In clipped wounds, newly deposited collagen appears as a biaxially oriented network as observed in normal skin. In open wounds a delay in the organization of the collagen network is observed and parallel wavy-shaped ribbons of collagen fibers are deposited. At long term, the high extensibility observed in open wounds may be due to the sliding of ribbons of collagen fibers past each other.

Numerical analysis and investigation of short- and long-term behavior of unidirectional composites

2017 ◽  
Vol 52 (5) ◽  
pp. 659-678
Author(s):  
Elias Dib ◽  
Jean François Caron ◽  
Wassim Raphael ◽  
Ioannis Stefanou ◽  
Fouad Kaddah
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Fiber Strength ◽  
Fiber Type ◽  
Glass Fibers ◽  
Shear Lag ◽  
Unidirectional Composites ◽  
Long Term Behavior ◽  
Shear Lag Theory

This study gives a detailed analysis on estimating the ultimate tensile strength of unidirectional fiber reinforced composites and its creep behavior under sustained tension load. We develop two different micromechanical models that allow us to estimate the longitudinal tensile strength and the evolution with time of fiber and matrix stresses around arbitrary array of fiber breaks. The first model is based on the shear-lag theory while the second one is developed using the software Abaqus. The comparison of the above models allowed to validate the fundamental assumptions of the shear-lag theory (first model) as well as several numerical issues related to time integration and spatial discretization. The Monte–Carlo method was used in order to account for the stochastic fiber strength and its impact on the ultimate tensile strength (short-term) and creep (long-term behavior) of unidirectional composites. Finally, a parametric investigation on the fiber type and the load level on the long-term behavior of unidirectional composites was performed showing an accelerating creep effect for fibers of inferior quality such as glass fibers compared to carbon fibers.

Relationship between mechanical properties of one-step self-etch adhesives and water sorption

2010 ◽  
Vol 26 (4) ◽  
pp. 360-367 ◽  
Author(s):  
Keiichi Hosaka ◽  
Masatoshi Nakajima ◽  
Masahiro Takahashi ◽  
Shima Itoh ◽  
Masaomi Ikeda ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Water Sorption ◽  
One Step ◽  
Self Etch
Sign in / Sign up

Export Citation Format

Share Document