Influence of the energy density on the physical properties and bond strength of two restorative systems

2012 ◽  
Author(s):  
Anderson Catelan
Keyword(s):  
Energy Density ◽  
Bond Strength ◽  
Physical Properties

scholarly journals Anti-Microbial and Remineralizing Properties of Self-Adhesive Orthodontic Resin Containing Mesoporous Bioactive Glass

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3550
Author(s):  
Aerin Choi ◽  
Kyung-Hyeon Yoo ◽  
Seog-Young Yoon ◽  
Bong-Soo Park ◽  
In-Ryoung Kim ◽  
...  
Keyword(s):  
Bond Strength ◽  
Physical Properties ◽  
Bioactive Glass ◽  
Shear Bond Strength ◽  
Antibacterial Effect ◽  
Gram Positive ◽  
Gram Negative ◽  
Gram Positive Bacteria ◽  
Significant Difference ◽  
Mesoporous Bioactive Glass

Self-adhesive resins (SARs) contain adhesives, which simplify the procedures of resin application, and primers, which provide sufficient bonding ability. In this study, mesoporous bioactive glass nanoparticles (MBN) were added to a SAR to easily improve the physical properties and remineralization ability. The experimental resins comprised 1%, 3%, and 5% MBN mixed in Ortho Connect Flow (GC Corp, Tokyo, Japan). As the MBN content in the SAR increased, the microhardness increased, and a statistically significant difference was observed between the cases of 1% and 5% MBN addition. Shear bond strength increased for 1% and 3% MBN samples and decreased for 5% MBN. The addition of MBN indicated a statistically significant antibacterial effect on both gram-negative and gram-positive bacteria. The anti-demineralization experiment showed that the remineralization length increased with the MBN content of the sample. Through the above results, we found that SAR containing MBN has antibacterial and remineralization effects. Thus, by adding MBN to the SAR, we investigated the possibility of orthodontic resin development, wherein the strength is enhanced and the drawbacks of the conventional SAR addressed.

Wire Adhesion Testing

1972 ◽  
Vol 45 (1) ◽  
pp. 16-25 ◽  
Author(s):  
L. C. Coates ◽  
C. Lauer
Keyword(s):  
Bond Strength ◽  
Physical Properties ◽  
Test Method ◽  
Material Strength ◽  
Basic Design ◽  
Rubber Compound ◽  
Reliable Test ◽  
Adhesion Testing ◽  
Rubber Compounds ◽  
The Relationship

Abstract The results of this study are conclusive. The ASTM D-2229 Test Method is not a reliable test for measuring adhesion of wire cords to rubber compounds. However, by using the basic design and modifying it, an accurate measurement of bond strength on a macroscopic level can be obtained. This test is insensitive for all practical purposes to compound physical properties and changes in cord diameter and embedded length—for both stranded and rod-like cords. It is also possible with this test to calculate the amount of stress that is exerted on the surface of the wire cord to determine the relationship between failing stress and the material strength of the rubber compound. Properly used, this new test should give the compounder a better tool to study the adhesion of compounds to metal.

Polypropylene Oxide. IV. Preparation and Properties of Polyether Networks

1967 ◽  
Vol 40 (5) ◽  
pp. 1421-1425
Author(s):  
G. Allen ◽  
H. G. Crossley
Keyword(s):  
Energy Density ◽  
Natural Rubber ◽  
Physical Properties ◽  
Propylene Oxide ◽  
Cohesive Energy ◽  
Dynamic Properties ◽  
Point Of View ◽  
Polypropylene Oxide ◽  
Cohesive Energy Density

Abstract Stable vulcanizates of copolymers of propylene oxide and butadiene monoxide have been prepared and some physical properties studied. The cohesive energy density of a copolymer containing 84 per cent propylene oxide is determined from swelling measurements to be 83 cal cm−. The dynamic properties of the copolymer are similar to those of natural rubber. From a thermodynamic point of view the copolymer is more ideal in its rubbery behavior than natural rubber.

scholarly journals Dynamics of Hyperbolically Symmetric Fluids

Symmetry ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1568 ◽  
Author(s):  
Luis Herrera ◽  
Alicia Di Prisco ◽  
Justo Ospino
Keyword(s):  
Energy Density ◽  
Physical Properties ◽  
Central Region ◽  
Analytical Solutions ◽  
Fluid Element ◽  
Exact Analytical Solutions ◽  
Thermodynamical Properties ◽  
Dissipative Fluid ◽  
Inner Region ◽  
Vacuum Cavity

We study the general properties of dissipative fluid distributions endowed with hyperbolical symmetry. Their physical properties are analyzed in detail. It is shown that the energy density is necessarily negative, and the central region cannot be attained by any fluid element. We describe this inner region by a vacuum cavity around the center. By assuming a causal transport equation some interesting thermodynamical properties of these fluids are found. Several exact analytical solutions, which evolve in the quasi–homologous regime and satisfy the vanishing complexity factor condition, are exhibited.

scholarly journals Adhesion of a self-etching adhesive to caries-affected dentin treated with different methods for caries removal: a preliminary study

2016 ◽  
Vol 19 (4) ◽  
pp. 32
Author(s):  
Adriana Bona Matos ◽  
Cynthia Soares De Azevedo ◽  
Livia Tosi Trevelin ◽  
Ana Cecília Correa Aranha
Keyword(s):  
Energy Density ◽  
Bond Strength ◽  
Nd:Yag Laser ◽  
Er:Yag Laser ◽  
Laser Energy ◽  
Laser Energy Density ◽  
Bonding Performance ◽  
Significant Difference ◽  
Caries Removal ◽  
Etching System

<p><strong>Objective</strong>: The aim of this study was to evaluate the adhesion of a self-etching system to caries-affected dentin (CAD) and sound dentin (SD) after different caries removal techniques by using microtensile bond strength test (μTBS). <strong>Materials</strong> <strong>and</strong> <strong>Methods</strong>: Twenty-four extracted human molars with coronal carious lesions were used. The samples were randomly divided into 5 groups, according to caries removal method: G1 - negative control (no removal); G2 abrasive disc; G3 – slow speed steel bur; G4 - Nd:YAG laser (energy density 21.2J/cm<sup>2</sup>); G5 - Er:YAG laser (energy density 80.24J/cm<sup>2</sup>). SD and  CAD/ infected dentin substrates were tested.  Self-etch system (Clearfil SE Bond) was applied and resin crowns were built up. <strong>Results</strong>: One-way ANOVA showed statistically significant difference between experimental groups (p&lt;0.001), with significantly lower results for infected dentin (G1), when compared to all other experimental groups. A statistically significant higher bond strength value was observed for SD irradiated with Er:YAG laser when compared to CAD. For bur and Nd:YAG laser specimens, SD and CAD showed the same bonding performance. <strong>Conclusion</strong>: infected dentin is not an adequate substrate for bonding; Nd:YAG laser and steel burs showed the same bonding performance for both SD and CAD; while both dentins, when irradiated by Er:YAG laser, did not adequately interact with self-etching system resulting in poor adhesion.</p><p><strong>Keywords</strong>: Er:YAG laser; Nd:YAG laser; Infected dentin; Dentin.</p>

scholarly journals Effect of bioactive glass addition on the physical properties of mineral trioxide aggregate

2021 ◽  
Vol 25 (1) ◽  
Author(s):  
Jei Kim ◽  
Hyun-Jung Kim ◽  
Seok Woo Chang ◽  
Soram Oh ◽  
Sun-Young Kim ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Bond Strength ◽  
Physical Properties ◽  
Bioactive Glass ◽  
Body Fluid ◽  
Setting Time ◽  
Mineral Trioxide Aggregate ◽  
Xrd Analysis ◽  
Control Group ◽  
Push Out

Abstract Background The addition of bioactive glass (BG), a highly bioactive material with remineralization potential, might improve the drawback of weakening property of mineral trioxide aggregates (MTA) when it encounters with body fluid. This study aims to evaluate the effect of BG addition on physical properties of MTA. Methods ProRoot (MTA), and MTA with various concentrations of BG (1, 2, 5 and 10% BG/MTA) were prepared. Simulated body fluid (SBF) was used to investigate the effect of the storage solution on dentin remineralization. Prepared specimens were examined as following; the push-out bond strength to dentin, compressive strength, setting time solubility and X-ray diffraction (XRD) analysis. Results The 2% BG/MTA showed higher push-out bond strengths than control group after 7 days of SBF storage. The 2% BG/MTA exhibited the highest compressive strength. Setting times were reduced in the 1 and 2% BG/MTA groups, and solubility of all experimental groups were clinically acceptable. In all groups, precipitates were observed in dentinal tubules via SEM. XRD showed the increased hydroxyapatite peaks in the 2, 5 and 10% BG/MTA groups. Conclusion It was verified that the BG-added MTA increased dentin push-out bond strength and compressive strength under SBF storage. The addition of BG did not negatively affect the MTA maturation reaction; it increased the amount of hydroxyapatite during SBF maturation.

scholarly journals Effects of Coupling Agent and Thermoplastic on the Interfacial Bond Strength and the Mechanical Properties of Oriented Wood Strand–Thermoplastic Composites

Polymers ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 4260
Author(s):  
Ziling Shen ◽  
Zhi Ye ◽  
Kailin Li ◽  
Chusheng Qi
Keyword(s):  
Mechanical Properties ◽  
Bond Strength ◽  
Physical Properties ◽  
Coupling Agent ◽  
Modulus Of Rupture ◽  
Thermoplastic Composites ◽  
Interfacial Bond ◽  
Interfacial Bond Strength ◽  
Factors Affecting ◽  
Mechanical And Physical Properties

Wood–plastic composites (WPC) with good mechanical and physical properties are desirable products for manufacturers and customers, and interfacial bond strength is one of the most critical factors affecting WPC performance. To verify that a higher interfacial bond strength between wood and thermoplastics improves WPC performance, wood veneer–thermoplastic composites (VPC) and oriented strand–thermoplastic composites (OSPC) were fabricated using hot pressing. The effects of the coupling agent (KH550 or MDI) and the thermoplastic (LDPE, HDPE, PP, or PVC) on the interfacial bond strength of VPC, and the mechanical and physical properties of OSPC, were investigated. The results showed that coupling agents KH550 and MDI improved the interfacial bond strength between wood and thermoplastics under dry conditions. MDI was better than KH550 at improving the interfacial bond strength and the mechanical properties of OSPC. Better interfacial bonding between plastic and wood improved the OSPC performance. The OSPC fabricated using PVC film as the thermoplastic and MDI as the coupling agent displayed the highest mechanical properties, with a modulus of rupture of 91.9 MPa, a modulus of elasticity of 10.9 GPa, and a thickness swelling of 2.4%. PVC and MDI are recommended to fabricate WPCs with desirable performance for general applications.

scholarly journals Antimicrobial and physical characteristics of orthodontic primers containing antimicrobial agents

2016 ◽  
Vol 87 (2) ◽  
pp. 307-312 ◽  
Author(s):  
Shin-Hye Chung ◽  
Soha Cho ◽  
Kyungsun Kim ◽  
Bum-Soon Lim ◽  
Sug-Joon Ahn
Keyword(s):  
Antimicrobial Activity ◽  
Bond Strength ◽  
Physical Properties ◽  
Biofilm Formation ◽  
Shear Bond Strength ◽  
Antimicrobial Agents ◽  
Antimicrobial Activities ◽  
Water Tank ◽  
Bond Failure ◽  
Significant Difference

ABSTRACT Objective: To compare the antimicrobial and physical properties of experimental primers containing chlorhexidine (CHX) or ursolic acid (UA) with a commercial primer. Materials and Methods: Two antibacterial agents, 3 mg each of CHX and UA were incorporated respectively into 1 ml of Transbond XT primer (TX) to form antibacterial primers, TX-CHX and TX-UA. The antimicrobial activity of the three primers (TX, TX-CHX, and TX-UA) against Streptococcus mutans in both planktonic and biofilm phases was analyzed by determining minimum inhibitory and bactericidal concentrations and by performing growth and biofilm assays. Growth and biofilm assays were performed in both the absence and presence of thermocycling in a water tank to analyze the effects of water aging on the antimicrobial activities of primers. After bonding brackets onto bovine incisors using the primers, shear bond strength and mode of fracture were analyzed to compare physical properties. Results: TX-CHX had stronger antimicrobial activity against S. mutans in the planktonic and biofilm phases than did TX or TX-UA. When applied, TX-CHX completely inhibited the growth and biofilm formation of S. mutans. In addition, the antimicrobial activity of TX-CHX was maintained after thermocycling. However, TX-UA did not show significant antimicrobial activity compared with TX. There was no significant difference in either shear bond strength or bond failure interface among the primers. Conclusion: Incorporation of CHX into an orthodontic primer may help prevent enamel demineralization around surfaces without compromising its physical properties.

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