On the Interface between Porcelain and Titanium

Low-fusing dental porcelain was fused on titanium surface. The adhesion between the titanium and porcelain was evaluated by three-point flexure test. It was shown that the failure of the titaniumporcelain predominantly occurred at the alloy-oxide interface. Rutile phase was present on the interface debonding from porcelain. The influence of corrosion on bonding strength was also investigated. The results suggested that, after being immersed in artificial saliva with pH of 2.7, 5.4 and 7.0, no decreasing of the bonding strength of Ti-porcelain occurred.

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Effect of Baicalein on Matrix Metalloproteinases and Durability of Resin-Dentin Bonding

Operative Dentistry ◽

10.2341/17-097-l ◽

2018 ◽

Vol 43 (4) ◽

pp. 426-436 ◽

Cited By ~ 3

Author(s):

J Li ◽

B Chen ◽

N Hong ◽

S Wu ◽

Y Li

Keyword(s):

Matrix Metalloproteinases ◽

Bonding Strength ◽

Resin Composite ◽

Artificial Saliva ◽

Adhesive System ◽

Inhibitory Effect ◽

Dentin Bonding ◽

Microtensile Testing ◽

Etch And Rinse

SUMMARY Objective: In an attempt to increase resin-dentin bonding quality, this study used baicalein as a preconditioner in an etch-and-rinse adhesive to evaluate its effect on matrix metalloproteinases (MMPs) and adhesive durability. Methods: As a MMP inhibitor and potential collagen cross-linking agent, baicalein was used as a preconditioner in an etch-and-rinse adhesive system. The degree of conversion was evaluated by Fourier-transform infrared spectroscopy. EnzChek gelatinase/collagenase assay kits were then used to detect the MMP inhibitory effect of different concentrations of baicalein (0.1, 0.5, 2.5, and 5.0 μg/mL) on dentin powders. During in vitro bonding procedures, flat dentin surfaces on sound third molars were preconditioned with 2.5 μg/mL baicalein after being acid-etched; this step was followed by continuation of adhesive processes and build-up of resin composite. After resin-dentin stick preparation, bonding strength, failure mode, and interface nanoleakage were respectively evaluated via microtensile testing, stereomicroscopy, and field emission scanning electron microscopy either immediately or after storage in artificial saliva for three or six months. Data were analyzed by two-way analysis of variance and Tukey test (α=0.05). Results: Baicalein at a concentration of 0-5.0 μg/mL did not influence the conversion of adhesives. However, it inhibited the activities of dentin-bond gelatinase and collagenase, especially at a concentration of 2.5 μg/mL, while effectively increasing microtensile bonding strength and decreasing nanoleakage in vitro, both immediately and after aging. Conclusions: Baicalein used as preconditioner in an etch-and-rinse adhesive system has an anti-MMP function and effectively improves resin-dentin bonding durability in vitro, which has potential value in clinical bonding procedures.

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A New Approach for Modeling of Fatigue Crack Growth in Welded Cruciform and Curve T Joint Structures

Applied Mechanics ◽

10.1115/imece2005-81535 ◽

2005 ◽

Author(s):

Mohammad S. Alam ◽

Muhammad A. Wahab

Keyword(s):

Fatigue Crack ◽

Fatigue Crack Growth ◽

Crack Propagation ◽

Crack Growth ◽

Bonding Strength ◽

Computer Time ◽

Interface Element ◽

Interface Debonding ◽

T Joints ◽

New Approach

A new approach for the simulation of fatigue crack growth in welded joint has been developed and the concept has been applied to welded cruciform and curve T-joints. The phenomena of crack propagation and interface debonding can be regarded as the formation of new surface. Thus, it is possible to model these problems by introducing the mechanism of surface formation. In the proposed method, the formation of new surface is represented by interface element based on the interface potential energy. The properties of this interface element represent the bonding strength of the material. As the cyclic load continues, the bonding strength decreases between the interacting surfaces and the crack propagates slowly. Based on this concept, an ANSYS code has been written for the simulation of crack propagation. Using this code, fatigue crack growth rate and fatigue crack propagation life of 2-D FEM models of welded cruciform and curve T-joints for different stress/load ratios have been analyzed and presented in this paper. The method is relatively simple compared to other conventional FEM method and save computer time significantly. The predicted results are compared with experimental results and good agreement has been achieved.

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The Burdened Area as a Structural Indicator of Interface Bonding Strength

Journal of Engineering Materials and Technology ◽

10.1115/1.2807002 ◽

1998 ◽

Vol 120 (2) ◽

pp. 137-142

Author(s):

Y. F. Luo

Keyword(s):

Bonding Strength ◽

Mechanical Design ◽

Structural Parameters ◽

Classical Equation ◽

Structural Effect ◽

Fracture Mechanisms ◽

Interface Debonding ◽

Interface Adhesion ◽

Interface Bonding Strength ◽

Structural Indicator

In laminate structures, the interface debonding failures usually result from very complex fracture mechanisms which lead to different strengthening approaches. The bonding strength of two dissimilar bodies depends, to a great extent, on the bulk materials and the bonding structure in addition to the intrinsic interface adhesion. The structural effect on bonding strength will be emphasized in this investigation. The analysis will exhibit the relationship of materials, structures, and interface adhesion which is essential in understanding the failure mechanisms. This paper proposes that the burdened area on an interface is, according to experimental and analytical results, a structural indicator for bonding strength. Such a comprehensive parameter makes it easy to determine the complex contributions of so many structural parameters to the bonding strength. Although there are many microscopic observations of separated surfaces which support the concept of burdened area, a direct measurement of the burdened area is difficult in practice. Therefore an analytical or numerical evaluation is necessary. The solutions from the classical equation of elastic plate will be used to determine the distribution of interface stress as well as the size of burdened area. The bonding strength is considered as fracture toughness which is directly related with the burdened area. As a useful indicator for evaluating the bonding strength, the burdened area includes the effects of many structural parameters and mechanical properties, such as: elastic modulus, Poisson’s ratio, layer thickness, slanting angel, and corner radius. Burdened area is a property of structure because it is independent of the peeling loads, the material’s yielding strength and interface adhesion. As far as energy release rate is concerned, the boundary load is virtually distributed on the whole burdened area. The concept of burdened area will facilitate mechanical design of bonding strength and leads to a better understanding of various debonding failures.

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Effect of Titanium Surface Texture on Bonding Strength of Porcelain Fused to Titanium.

Nihon Hotetsu Shika Gakkai Zasshi ◽

10.2186/jjps.39.590 ◽

1995 ◽

Vol 39 (3) ◽

pp. 590-600 ◽

Cited By ~ 2

Author(s):

Kazuo Motomura

Keyword(s):

Surface Texture ◽

Bonding Strength ◽

Titanium Surface

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Influence of Biocompatible Coating on Titanium Surface Characteristics

10.20944/preprints202004.0396.v1 ◽

2020 ◽

Author(s):

Željka Petrović ◽

Jozefina Katić ◽

Ankica Šarić ◽

Ines Despotović ◽

Nives Matijaković ◽

...

Keyword(s):

Self Assembly ◽

Titanium Surface ◽

Electrochemical Impedance ◽

Calcium Phosphates ◽

Artificial Saliva ◽

Surface Characteristics ◽

Corrosion Stability ◽

Assembly Method

Background: Nowadays investigations in the field of dental implants engineering are focused on bioactivity and osseointegration properties.Objective: In this study, the oxide-covered titanium was functionalized by vitamin D3 molecules via a simple self-assembly method with the aim to design more corrosion resistant and at the same time more bioactive surface.Methods: Surface properties of the D3-coated titanium were examined by scanning electron microscopy, attenuated total reflectance Fourier transform infrared spectroscopy, and contact angle measurements, while a long-term corrosion stability during immersion in an artificial saliva solution was investigated in situ by electrochemical impedance spectroscopy.Results: Results of all techniques confirmed a successful formation of the D3 vitamin layer on the oxide-covered titanium. Besides very good corrosion resistivity (~5 MΩcm2 ) the D3-modified titanium surface induced spontaneous formation of biocompatible bone-like calcium phosphates (CaP).Conclusion: Observed in vitro CaP-forming ability as a result of D3-modified titanium/artificial saliva interactions could serve as a promising predictor of in vivo bioactivity of implant materials.

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Influence of Biocompatible Coating on Titanium Surface Characteristics

Innovations in Corrosion and Materials Science (Formerly Recent Patents on Corrosion Science) ◽

10.2174/2352094910999200407095723 ◽

2020 ◽

Vol 10 (1) ◽

pp. 37-46 ◽

Cited By ~ 1

Author(s):

Željka Petrović ◽

Jozefina Katić ◽

Ankica Šarić ◽

Ines Despotović ◽

Nives Matijaković ◽

...

Keyword(s):

Vitamin D3 ◽

Titanium Surface ◽

Electrochemical Impedance ◽

Calcium Phosphates ◽

Artificial Saliva ◽

Surface Characteristics ◽

Corrosion Stability ◽

Assembly Method

Background: Nowadays investigations in the field of dental implants engineering are focused on bioactivity and osseointegration properties. Objective: In this study, the oxide-covered titanium was functionalized by vitamin D3 molecules via a simple self-assembly method with the aim to design more corrosion-resistant and at the same time more bioactive surface. Methods: Surface properties of the D3-coated titanium were examined by scanning electron microscopy, attenuated total reflectance Fourier transform infrared spectroscopy, and contact angle measurements, while long-term corrosion stability during immersion in an artificial saliva solution was investigated in situ by electrochemical impedance spectroscopy. Results: Results of all techniques confirmed a successful formation of the vitamin D3 layer on the oxide-covered titanium. Besides very good corrosion resistivity (~5 MΩ cm2), the D3-modified titanium surface induced spontaneous formation of biocompatible bone-like calcium phosphates (CaP). Conclusion: Observed in vitro CaP-forming ability as a result of D3-modified titanium/artificial saliva interactions could serve as a promising predictor of in vivo bioactivity of implant materials.

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