Adhesion of Resins to Ag-Pd Alloys by Means of the Silicoating Technique

1987 ◽  
Vol 66 (8) ◽  
pp. 1380-1385 ◽  
Author(s):  
H. Herø ◽  
I.E. Ruyter ◽  
M.L. Waarli ◽  
G. Hultquist
Keyword(s):  
Surface Layer ◽  
Bond Strength ◽  
Chemical Bonding ◽  
Silicon Oxide ◽  
Surface Defects ◽  
Water Storage ◽  
Flame Spraying ◽  
Four Point Bending ◽  
Bond Strengths ◽  
Oxide Particles

The purpose of the investigation was to study the effect of water storage on the bond strengths between silanized, silicoated Ag-Pd alloys and veneered composites, in comparison with the bond strengths of systems with conventional retention beads. Furthermore, the mechanism of the bonding was examined. The bond strength of silanized, silicoated dry specimens and similar specimens stored in water was measured by four-point bending. Water storage for 90 days at 37°C reduced the bond strength by approximately 30% to about 15-20 MPa. Mechanical retention beads caused bond strengths of approximately 16-18 MPa which were unaffected by water storage. SEM and microprobe investigations showed that sandblasting with Al2O3 prior to silanization caused substantial numbers of cracks and porosities in the surface layer of the alloy, partly filled with Al2O3. Some particles of silicon oxide in these surface defects were produced by the flame-spraying of the so-called silicoating technique. Further painting of the surface with a silane adhesion primer provided chemical bonding to the composite at the densely spaced Si-O-H-containing silica particles. Many cracks were observed in the interfaces between these particles; thus, water is likely to penetrate the interface with time. The bond strength is most likely reduced by reaction between water and the compositelSi-O structure. The silicon oxide particles are probably attached to the alloy substrate by mechanical retention. Without sandblasting, no bonding was obtained by means of the silicoating technique.

scholarly journals Durability of Enamel Bonding Using One-step Self-etch Systems on Ground and Unground Enamel

10.2341/08-58 ◽  
2009 ◽  
Vol 34 (2) ◽  
pp. 181-191 ◽  
Author(s):  
A. Reis ◽  
S. K. Moura ◽  
A. Pellizzaro ◽  
K. Dal-Bianco ◽  
A. M. Andrade ◽  
...  
Keyword(s):  
Bond Strength ◽  
Clinical Relevance ◽  
Water Storage ◽  
Adhesive System ◽  
One Step ◽  
Bond Strengths ◽  
Self Etch

Clinical Relevance The improvement of resin-enamel bond strengths after using Si-C paper and diamond burs for enamel preparation is material dependent. No degradation of enamel bond strength could be observed for any one-step self-etch adhesive system after 12 months of water storage.

scholarly journals Effect of Removal of Enamel on Rebonding Strength of Resin Composite to Enamel

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
L. Kilponen ◽  
L. Lassila ◽  
M. Tolvanen ◽  
J. Varrela ◽  
P. K. Vallittu
Keyword(s):  
Surface Layer ◽  
Bond Strength ◽  
Resin Composite ◽  
Optical Profilometer ◽  
Bond Strengths

Objective. To examine the effect of removing the surface layer of enamel on the rebonding strength of resin composite.Methods. Teeth in four groups (n=10) were etched, a small amount of resin composite was bonded and debonded, then specimens in three groups were ground for different lengths of time (10 s, 20 s, 30 s) to remove an increasing amount of enamel, one group was left untouched. The teeth were bonded again and the bond strengths of 1st and 2nd bonding were compared and analysed against the amount of enamel loss in different groups (7 µm (±2); 12 µm (±1); 16 µm (±3)). Specimens were examined with SEM and by noncontacting optical profilometer.Results. Although results indicated higher rebonding strength with increasing enamel removal ANOVA showed low statistical differences between the groups (p>0.05). However, values between first bonding and rebonding strengths differed significantly (p<0.05) in the group that was not ground. SEM revealed that enamel-surfaces that were ground after debonding etched well, compared to the surfaces that still contained adhesive remnants.Conclusions. Removal of small amount of enamel refreshed the surface for rebonding. Rebonding strengths without grinding the surface before bonding were lower than bond strength to intact enamel.

Effect of Water Storage on Bond Strength of Self-etching Adhesives to Dentin

2007 ◽  
Vol 8 (7) ◽  
pp. 46-53 ◽  
Author(s):  
Rubens Nazareno Garcia ◽  
Mario Fernando de Goes ◽  
Marcelo Giannini
Keyword(s):  
Bond Strength ◽  
Testing Machine ◽  
Water Storage ◽  
Internal Diameter ◽  
Adhesive Systems ◽  
Bonding Agents ◽  
Effect Of Water ◽  
One Step ◽  
Bond Strengths ◽  
One Year

Abstract Aim The objective of this study was to evaluate the bond strength of self-etching adhesive systems one week and one year after storage in water. Methods and Materials Fragments from the buccal surfaces of 45 bovine teeth were prepared (12 mm in length X 5 mm in width X 1.0 mm in thickness). Dentin surfaces were wet-abraded with 600-grit SiC paper to create a standardized smear layer. Samples were randomly assigned to 18 experimental groups (n=5), according to nine adhesive systems tested (Single Bond; Adper Prompt L-Pop; iBond; One-Up Bond F; Xeno III; Clearfil SE Bond; Optibond Solo Plus SE; Tyrian SPE/One-Step Plus; and UniFil Bond) and two waterstorage times (one week and one year). Adhesives were applied according to the manufacturers’ instructions. Z250 composite was applied into the molds to fill up the internal diameter volume of a Tygon tubing mold (1.0 mm high / 0.7 mm internal diameter). Micro-shear bond strengths were determined using an apparatus attached to an Instron Universal Testing Machine (0.5 mm/min). Data were statistically analyzed using a twoway analysis of variance (ANOVA) and the Tukey's test (5%). Results One year after water storage the dentin bond strength of all adhesive systems reduced significantly, except for One-Up Bond F. Conclusion Water-storage time decreased the bond strength for most dentin bonding agents tested. Citation Garcia RN, de Goes MF, Giannini M. Effect of Water Storage on Bond Strength of Self-etching Adhesives to Dentin. J Contemp Dent Pract 2007 November; (8)7:046-053.

scholarly journals Flexural Strength of Resin Core Build-Up Materials: Correlation to Root Dentin Shear Bond Strength and Pull-Out Force

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2947
Author(s):  
Masao Irie ◽  
Yukinori Maruo ◽  
Goro Nishigawa ◽  
Kumiko Yoshihara ◽  
Takuya Matsumoto
Keyword(s):  
Flexural Strength ◽  
Bond Strength ◽  
Shear Bond Strength ◽  
Water Storage ◽  
Bending Test ◽  
Pull Out ◽  
Resin Core ◽  
Root Dentin ◽  
Bond Strengths ◽  
Almost All

The aims of this study were to investigate the effects of root dentin shear bond strength and pull-out force of resin core build-up materials on flexural strength immediately after setting, after one-day water storage, and after 20,000 thermocycles. Eight core build-up and three luting materials were investigated, using 10 specimens (n = 10) per subgroup. At three time periods—immediately after setting, after one-day water storage, and after 20,000 thermocycles, shear bond strengths to root dentin and pull-out forces were measured. Flexural strengths were measured using a 3-point bending test. For all core build-up and luting materials, the mean data of flexural strength, shear bond strength and pull-out force were the lowest immediately after setting. After one-day storage, almost all the materials yielded their highest results. A weak, but statistically significant, correlation was found between flexural strength and shear bond strength (r = 0.508, p = 0.0026, n = 33). As the pull-out force increased, the flexural strength of core build-up materials also increased (r = 0.398, p = 0.0218, n = 33). Multiple linear regression analyses were conducted using these three independent factors of flexural strength, pull-out force and root dentin shear bond strength, which showed this relationship: Flexural strength = 3.264 × Shear bond strength + 1.533 × Pull out force + 10.870, p = 0.002). For all the 11 core build-up and luting materials investigated immediately after setting, after one-day storage and after 20,000 thermocycles, their shear bond strengths to root dentin and pull-out forces were correlated to the flexural strength in core build-up materials. It was concluded that the flexural strength results of the core build-up material be used in research and quality control for the predictor of the shear bond strength to the root dentin and the retentive force of the post.

scholarly journals The effect of metal surface treatment on bond strength interface between metal/cement

2015 ◽  
Vol 18 (4) ◽  
pp. 43
Author(s):  
Osvaldo Daniel Andreatta-Filho ◽  
Vinícius Anéas Rodrigues ◽  
Alexandre Luiz Souto Borges ◽  
Paula Carolina Komori de Carvalho ◽  
Renato Sussumu Nishioka
Keyword(s):  
Bond Strength ◽  
Surface Treatment ◽  
Testing Machine ◽  
Constant Load ◽  
Surface Treatments ◽  
Resin Cement ◽  
Nickel Chromium ◽  
Microtensile Test ◽  
Bond Strengths ◽  
Oxide Particles

<p class="western" align="justify"><span style="font-family: 'Times New Roman', serif;"><span style="font-family: Arial, serif;"><span lang="en-US"><strong>Objective</strong></span></span><span style="font-family: Arial, serif;"><span lang="en-US">: This study evaluated the hypothesis that different treatments of surface upon three metal alloys for metal ceramic dental prostheses (Gold; Nickel-Chromium; Titanium) do not Influence the values of bond strength with resin cement. </span></span><span style="font-family: Arial, serif;"><span lang="en-US"><strong>Material and Methods:</strong></span></span><span style="font-family: Arial, serif;"><span lang="en-US"> Twenty blocks, 5x5x5 mm, of each alloy were divided into two subgroups (n = 10) according to surface treatments: 1 (Primer): sandblasting with aluminum oxide particles 110 µm (Al</span></span><sub><span style="font-family: Arial, serif;"><span lang="en-US">2</span></span></sub><span style="font-family: Arial, serif;"><span lang="en-US">O</span></span><sub><span style="font-family: Arial, serif;"><span lang="en-US">3</span></span></sub><span style="font-family: Arial, serif;"><span lang="en-US">) + Alloy Primer (Kuraray); 2 (Cojet): sandblasting with silica oxide particles with Cojet-Sand + Silane ESPE-Sil. The conditioned blocks of each group were cemented, with Panavia F, to resin blocks under constant load of 750 g/10 min. The sets were cut to obtain 4 samples with dimensions of 10x1x1 mm per block (n = 10) and the adhesive surface with approximately 1 mm</span></span><sup><span style="font-family: Arial, serif;"><span lang="en-US">2</span></span></sup><span style="font-family: Arial, serif;"><span lang="en-US">. The microtensile test was done in the universal testing machine at 1 mm/min crosshead speed. The values of bond strength and standard deviation (MPa) were: Au P: 7.33 ± 1.93</span></span><sup><span style="font-family: Arial, serif;"><span lang="en-US">d</span></span></sup><span style="font-family: Arial, serif;"><span lang="en-US">; Au C: 13.35 ± 2.18</span></span><sup><span style="font-family: Arial, serif;"><span lang="en-US">c</span></span></sup><span style="font-family: Arial, serif;"><span lang="en-US">; NiCr P: 23.56 ± 6.5</span></span><sup><span style="font-family: Arial, serif;"><span lang="en-US">b</span></span></sup><span style="font-family: Arial, serif;"><span lang="en-US">; NiCr C: 42.6 ± 5.84</span></span><sup><span style="font-family: Arial, serif;"><span lang="en-US">a</span></span></sup><span style="font-family: Arial, serif;"><span lang="en-US">; Ti P: 26.17 ± 1.94</span></span><sup><span style="font-family: Arial, serif;"><span lang="en-US">b</span></span></sup><span style="font-family: Arial, serif;"><span lang="en-US">; Ti C: 44.30 ± 2.3</span></span><sup><span style="font-family: Arial, serif;"><span lang="en-US">a</span></span></sup><span style="font-family: Arial, serif;"><span lang="en-US">. Data were analyzed by variance test (ANOVA) and Tukey’s test, p &lt; 0.05. </span></span><span style="font-family: Arial, serif;"><span lang="en-US"><strong>Results: </strong></span></span><span style="font-family: Arial, serif;"><span lang="en-US">The results indicated that the conditioning with treatment 2 increased the bond strength between the resin cement and alloys. The lowest bond strengths values were obtained with gold alloy, regardless the surface treatment. </span></span><span style="font-family: Arial, serif;"><span lang="en-US"><strong>Conclusion:</strong></span></span><span style="font-family: Arial, serif;"><span lang="en-US"> The results denied the hypothesis that the metallic alloys surface treatments do not alter the bond strengths values.</span></span></span></p>

The oxidation of Inconel alloy MA754 at low oxidation potential

1983 ◽  
Vol 41 ◽  
pp. 218-219
Author(s):  
D. N. Braski ◽  
P. D. Goodell ◽  
J. V. Cathcart ◽  
R. H. Kane
Keyword(s):  
Surface Layer ◽  
Oxidation Potential ◽  
Metal Interface ◽  
Elevated Temperature Strength ◽  
Surface Conditions ◽  
Inconel Alloy ◽  
Inco Alloy ◽  
Resistance To Oxidation ◽  
Oxide Particles ◽  
Cold Worked

It has been known for some time that the addition of small oxide particles to an 80 Ni—20 Cr alloy not only increases its elevated-temperature strength, but also markedly improves its resistance to oxidation. The mechanism by which the oxide dispersoid enhances the oxidation resistance is being studied collaboratively by ORNL and INCO Alloy Products Company.Initial experiments were performed using INCONEL alloy MA754, which is nominally: 78 Ni, 20 Cr, 0.05 C, 0.3 Al, 0.5 Ti, 1.0 Fe, and 0.6 Y2O3 (wt %).Small disks (3 mm diam × 0.38 mm thick) were cut from MA754 plate stock and prepared with two different surface conditions. The first was prepared by mechanically polishing one side of a disk through 0.5 μm diamond on a syntron polisher while the second used an additional sulfuric acid-methanol electropolishing treatment to remove the cold-worked surface layer. Disks having both surface treatments were oxidized in a radiantly heated furnace for 30 s at 1000°C. Three different environments were investigated: hydrogen with nominal dew points of 0°C, —25°C, and —55°C. The oxide particles and films were examined in TEM by using extraction replicas (carbon) and by backpolishing to the oxide/metal interface. The particles were analyzed by EDS and SAD.

scholarly journals Interfacial integrity of bonded restorations with self-etching adhesives: Water storage and thermo-mechanical cycling

2012 ◽  
Vol 06 (02) ◽  
pp. 169-177
Author(s):  
Gislaine Cristine Martins ◽  
Alfonso Sánchez-Ayala ◽  
Paulo Henrique Perlatti D’Alpino ◽  
Abraham Lincoln Calixto ◽  
João Carlos Gomes ◽  
...  
Keyword(s):  
Bond Strength ◽  
Water Storage ◽  
Single Bond ◽  
Third Molars ◽  
Class V ◽  
Mean Values ◽  
Composite Restorations ◽  
Mechanical Cycling ◽  
Interfacial Gap ◽  
Made In

ABSTRACTObjectives: Objective: To evaluate the effect of thermo-mechanical cycling (TMC) on the microleakage (μL) and axial gap width (AG) of Class V bonded restorations in premolars using self-etching adhesive systems. The bond strength of composite restorations to dentin (μTBS) using the same adhesives was also evaluated in third molars after water storage: 24 h and 6 months. The research hypotheses were tested for the results of two self-etching adhesives in comparison when a conventional two-step adhesive was used: (1) the μL and AG would be lower, regardless of TMC; (2) the μTBS of self-etching adhesives would be higher, irrespective of evaluation times.Methods: Sixty Class V composite restorations were made in 30 premolars and bonded with Adper Single Bond 2 (ASB2), AdheSE (ASE), and Adper Prompt L-Pop (APL-P) (n=20). Dentin μL and AG were immediately measured for half of the sample. The other half was evaluated after TMC. Eighteen third molars were also selected and bonded using the same adhesives to test the μTBS to dentin. Specimens were evaluated after 24 h and 6 months of water storage.Results: No differences in μL and AG were found among the groups (P>.05). The μTBS mean values were: ASB2>ASE>APL-P (P<.05); only Adper Single Bond 2 presented a significantly lower μTBS after water storage (P<.05)Conclusions: The bonding approach does not influence the microleakage and interfacial gap extension. Despite the decrease in the mean values, the bond strength to dentin of the conventional, two-step adhesive remains high after 6 months of water storage. (Eur J Dent 2012;6:169-177)

Durability of Enamel Bonding Using Two-step Self-etch Systems on Ground and Unground Enamel

10.2341/07-42 ◽  
2008 ◽  
Vol 33 (1) ◽  
pp. 79-88 ◽  
Author(s):  
A. D. Loguercio ◽  
S. K. Moura ◽  
A. Pellizzaro ◽  
K. Dal-Bianco ◽  
R. T. Patzlaff ◽  
...  
Keyword(s):  
Bond Strength ◽  
Clinical Relevance ◽  
Water Storage ◽  
Surface Preparation ◽  
The Self ◽  
Self Etch ◽  
Effect Of Surface

Clinical Relevance The effect of surface preparation was adhesive-dependent. Improvements in resin-enamel bond strength after enamel preparation were observed only for AdheSE and Optibond Solo plus Self-Etch Primer. Among the self-etch systems, mild, self-etch Clearfil SE Bond showed the highest bond strength values. No degradation of resin-enamel bonds was observed after 12 months of water storage, regardless of the adhesive tested.

Surface defect chemistry of Y-substituted and hydrated BaZrO3 with subsurface space-charge regions

2016 ◽  
Vol 4 (19) ◽  
pp. 7437-7444 ◽  
Author(s):  
Jonathan M. Polfus ◽  
Tor S. Bjørheim ◽  
Truls Norby ◽  
Rune Bredesen
Keyword(s):  
Surface Layer ◽  
Space Charge ◽  
Space Charge Region ◽  
First Principles ◽  
Surface Defect ◽  
Surface Defects ◽  
Defect Chemistry ◽  
First Principles Calculations ◽  
Proton Conducting ◽  
Charged Species

First-principles calculations were utilized to elucidate the complete defect equilibria of surfaces of proton conducting BaZrO3, encompassing charged species adsorbed to the surface, defects in the surface layer as well as in the subsurface space-charge region and bulk.

scholarly journals Shear bond strength of orthodontic brackets to enamel after application of a caries infiltrant

2014 ◽  
Vol 85 (4) ◽  
pp. 645-650 ◽  
Author(s):  
Laura Mews ◽  
Matthias Kern ◽  
Robert Ciesielski ◽  
Helge Fischer-Brandies ◽  
Bernd Koos
Keyword(s):  
Statistical Analysis ◽  
Bond Strength ◽  
Shear Force ◽  
Shear Bond Strength ◽  
Orthodontic Brackets ◽  
Enamel Defects ◽  
Adhesive Remnant Index ◽  
Demineralized Enamel ◽  
Kolmogorov Smirnov ◽  
Bond Strengths

ABSTRACT Objective:  To examine differences in the shear bond strength of orthodontic brackets on differently mineralized enamel surfaces after applying a caries infiltrant or conventional adhesive. Materials and Methods:  A total of 320 bovine incisors were assigned to eight pretreated groups, and the shear force required for debonding was recorded. Residual adhesive was evaluated by light microscopy using the adhesive remnant index. Statistical analysis included Kolmogorov-Smirnov, analysis of variance (ANOVA), and Scheffé tests. Results:  The highest bond strength (18.8 ± 4.4 MPa) was obtained after use of the caries infiltrant. More residual adhesive and fewer enamel defects were observed on infiltrated enamel surfaces. Brackets on demineralized enamel produced multiple enamel defects. Conclusions:  Acceptable bond strengths were obtained with all material combinations. A caries-infiltrant applied before bracket fixation has a protective effect, especially on demineralized enamel.

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