scholarly journals Effects of Copper Surface Oxidation and Reduction on Shear-Bond Strength Using Functional Monomers

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1753
Author(s):  
Haruto Hiraba ◽  
Hiroyasu Koizumi ◽  
Akihisa Kodaira ◽  
Kosuke Takehana ◽  
Takayuki Yoneyama ◽  
...  
Keyword(s):  
Bond Strength ◽  
Copper Oxide ◽  
Photoelectron Spectroscopy ◽  
Shear Bond Strength ◽  
Oxide Films ◽  
Surface Oxidation ◽  
Acrylic Resin ◽  
Copper Surface ◽  
Dihydrogen Phosphate ◽  
Functional Monomers

This study was conducted to clarify the influence of the copper surface oxidation and reduction on the shear-bond strength with functional monomers. Unheated copper specimens (UH; n = 88) were wet-ground. Three-quarters of the UH were then heated (HT). Two-thirds of the HT was then immersed in a hydrochloric acid solution (AC). Half of the AC was then reheated (RH). Each group was further divided into two groups (n = 11), which were primed by either 6-methacryloyloxyhexyl 2-thiouracil-5-carboxylate (MTU-6) or 10-methacryloyloxydecyl dihydrogen phosphate (MDP). The shear-bond strength tests were used for bonding with an acrylic resin. The surface roughness values and chemical states of the four groups were analyzed using a confocal scanning laser microscope and X-ray photoelectron spectroscopy (XPS). The shear-bond strengths of HT and RH were the lowest in the MTU-6-primed groups. The result of AC was significantly lower than others in the MDP-primed groups. The XPS results showed that the surfaces of UH and AC consisted of Cu2O and Cu. The surface changed to CuO upon heating. The presence or absence of copper-oxide films showed the opposite trends in the effectiveness of MTU-6 and MDP to improve bond strength. The results could elucidate the effects of functional monomers on copper-oxide films.

scholarly journals Influence of Oxidation of Copper on Shear Bond Strength to an Acrylic Resin Using an Organic Sulfur Compound

Materials ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2092
Author(s):  
Haruto Hiraba ◽  
Hiroyasu Koizumi ◽  
Akihisa Kodaira ◽  
Hiroshi Nogawa ◽  
Takayuki Yoneyama ◽  
...  
Keyword(s):  
Bond Strength ◽  
Photoelectron Spectroscopy ◽  
Shear Bond Strength ◽  
Acrylic Resin ◽  
Optical Microscope ◽  
Sulfur Compounds ◽  
Organic Sulfur ◽  
Organic Sulfur Compound ◽  
Organic Sulfur Compounds ◽  
Wet Ground

The aim of this study was to clarify the influence of the copper surfaces changed from Cu or Cu2O to CuO on the bonding strength of resin with organic sulfur compounds. The disk-shaped specimens (n = 44) of copper were wet-ground. Half of the specimens were heated at 400 °C for 4 min in an electric furnace (HT: heated). Half of the specimens were not heated (UH: unheated). The specimens were further divided into two groups. Each group was primed by 6-methacryloyloxyhexyl 2-thiouracil-5-carboxylate (MTU-6) or unprimed (n = 11). A statistical analysis of the results of shear bond strength testing was performed, and the failure mode of the bonded areas was classified with an optical microscope. Two types of specimen surface (UH or HT) were analyzed chemically using X-ray photoelectron spectroscopy (XPS). When primed with MTU-6, unheated Cu (28.3 MPa) showed greater bond strength than heated (19.1 MPa). When unprimed, heated Cu (4.1 MPa) showed greater bond strength than unheated (2.3 MPa). The results of the debonded surfaces observation showed that only the UH-MTU-6 group demonstrated a combination of adhesive and cohesive failures in all specimens. The XPS results showed that the surface of copper changed from Cu or Cu2O to CuO when HT. These results confirmed that it is necessary to take care of the copper oxide contained in noble metal alloys when using organic sulfur compounds for adhesion.

scholarly journals Shear bond strength of novel calcium aluminate-based cement (EndoBinder) to root dentine

2014 ◽  
Vol 08 (04) ◽  
pp. 498-503 ◽  
Author(s):  
Lucas da Fonseca Roberti Garcia ◽  
Hebert Luis Rossetto ◽  
Fernanda de Carvalho Panzeri Pires-de-Souza
Keyword(s):  
Bond Strength ◽  
Calcium Aluminate ◽  
Shear Bond Strength ◽  
Testing Machine ◽  
Mineral Trioxide Aggregate ◽  
Acrylic Resin ◽  
Promising Alternative ◽  
Mean Values ◽  
Significant Difference ◽  
Molar Teeth

ABSTRACT Objective: To evaluate the shear bond strength of a novel calcium aluminate-based cement, EndoBinder (EB), to dentine in comparison with Grey and White Mineral Trioxide Aggregate (MTA). Materials and Methods: Root canal hemi-sections obtained from 30 extracted molar teeth were embedded in self-polymerized acrylic resin and were grounded wet in order to obtain a flat dentine surface. Next, the roots were randomly assigned into three groups (n = 10), according to the cement used, as follows: EB: EndoBinder; WMTA: White MTA and GMTA: Grey MTA. The shear bond strength test was performed using a Universal Testing Machine (0.5 mm/min) and the data were submitted to statistical analysis (1-way ANOVA and Tukey tests, P < 0.05). Results: EB presented the highest shear bond strength values; however, there was no statistically significant difference in comparison with GMTA (P > 0.05). WMTA presented the lowest mean values, which were significant in comparison with EB (P < 0.05). Conclusions: The novel calcium aluminate-based cement presented higher shear bond strength than WMTA, and should be considered as a promising alternative in endodontic therapy.

Shear bond strength between acrylic resin teeth and composite resin

2014 ◽  
Vol 30 ◽  
pp. e38-e39
Author(s):  
M.A. Basílio ◽  
K.V. Cardoso ◽  
G.M.R.M. De Souza ◽  
E.M. Mariscal ◽  
J.N. Arioli-Filho
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Composite Resin ◽  
Acrylic Resin

The Effect of Dentin Desensitizer on Shear Bond Strength of Conventional and Self-adhesive Resin Luting Cements After Aging

2011 ◽  
Vol 36 (5) ◽  
pp. 492-501 ◽  
Author(s):  
B Stawarczyk ◽  
R Hartmann ◽  
L Hartmann ◽  
M Roos ◽  
M Özcan ◽  
...  
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Water Storage ◽  
Acrylic Resin ◽  
Luting Cements ◽  
Relyx Unicem ◽  
Aging Conditions ◽  
Post Hoc ◽  
The Impact ◽  
Panavia 21

SUMMARY This study tested the impact of Gluma Desensitizer on the shear bond strength (SBS) of two conventional (RelyX ARC, Panavia 21) and two self-adhesive (RelyX Unicem, G-Cem) resin luting cements after water storage and thermocycling. Human third molars (N=880) were embedded in acrylic resin. The buccal dentin was exposed. Teeth were randomly divided into four main groups, and the following cements were adhered: 1) RelyX ARC, 2) Panavia 21, 3) RelyX Unicem, and 4) G-Cem. In half of the teeth in each group, dentin was treated with Gluma Desensitizer. In the conventional cement groups, the corresponding etchant and adhesive systems were applied. SBS of the cements was tested after 1 hour (initial); at 1, 4, 9, 16, and 25 days of water storage; and at 1, 4, 9, 16, and 25 days of thermocycling. SBS data were analyzed by one-way analysis of variance (ANOVA); this was followed by the post hoc Scheffé test and a t-test. Overall, the highest mean SBS (MPa) was obtained by RelyX ARC (ranging from 14.6 ± 3.9 to 17.6 ± 5.2) and the lowest by Panavia 21 in combination with Gluma Desensitizer (ranging from 0.0 to 2.9 ± 1.0). All tested groups with and without desensitizer showed no significant decrease after aging conditions compared with baseline values (p&gt;0.05). Only the Panavia 21/Gluma Desensitizer combination showed a significant decrease after 4 days of thermocyling compared with initial values and 1 day thermocycling. Self-adhesive cements with Gluma Desensitizer showed increased SBS after aging conditions (ranging from 7.4 ± 1.4 to 15.2 ± 3) compared with groups without desensitizer (ranging from 2.6 ± 1.2 to 8.8 ± 2.9). No cohesive failures in dentin were observed in any of the test groups. Although self-adhesive cements with and without desensitizer presented mainly adhesive failures after water storage (95.8%) and thermocyling (100%), conventional cement (RelyX ARC) showed mainly mixed failures (90.8% and 89.2%, after water storage and thermocyling, respectively). Application of the Gluma Desensitizer to dentin before cementation had a positive effect on the SBS of self-adhesive cements.

scholarly journals Effect of Provisional Cements on Shear Bond Strength of Porcelain Laminate Veneers

2011 ◽  
Vol 05 (04) ◽  
pp. 373-379 ◽  
Author(s):  
Subutay Han Altintas ◽  
Onjen Tak ◽  
Asli Secilmis ◽  
Aslihan Usumez
Keyword(s):  
Bond Strength ◽  
Calcium Hydroxide ◽  
Shear Bond Strength ◽  
Testing Machine ◽  
Acrylic Resin ◽  
Resin Cement ◽  
Control Group ◽  
Molar Teeth ◽  
Laminate Veneers ◽  
Selection Of

ABSTRACTObjectives: The purpose of this study was to evaluate the effect of three provisional cements and two cleaning techniques on the final bond strength of porcelain laminate veneers. Methods: The occlusal third of the crowns of forty molar teeth were sectioned and embedded in autopolymerizing acrylic resin. Dentin surfaces were polished and specimens were randomly divided into four groups (n=10). Provisional restorations were fabricated and two provisional restorations were cemented onto each tooth. Restorations were fixed with one of three different provisional cements: eugenol-free provisional cement (Cavex), calcium hydroxide (Dycal), and light-cured provisional cement (Tempond Clear). Provisional restorations were removed with either a dental explorer and air-water spray, or a cleaning bur (Opticlean). In the control group, provisional restorations were not used on the surfaces of specimens. IPS Empress 2 ceramic discs were luted with a dual-cured resin cement (Panavia F). Shear bond strength was measured using a universal testing machine. Data were statistically analyzed by ANOVA, Tukey’s HSD and Dunnett tests. Surfaces were examined by scanning electronic microscopy. Results: Significant differences were found between the control group and both the light-cured provisional cement groups and the eugenol-free provisional cement-cleaning bur group (P<.05). Groups that had received light-cured provisional cement showed the lowest bond strength values. Conclusions: Selection of the provisional cement is an important factor in the ultimate bond strength of the final restoration. Calcium hydroxide provisional cement and cleaning with a dental explorer are advisable. (Eur J Dent 2011;5:373-379)

scholarly journals The cause of the colours shown during the oxidation of metallic copper

1927 ◽  
Vol 115 (772) ◽  
pp. 570-588 ◽  
Keyword(s):  
Thin Films ◽  
Oxide Film ◽  
Copper Oxide ◽  
Cupric Oxide ◽  
Metallic Copper ◽  
Oxide Films ◽  
Copper Surface ◽  
Considerable Time ◽  
Pass Through

During the initial stages of the oxidation of a clean metallic copper surface, and before the normal black colour of cupric oxide is finally attained, bright colours appear which pass through the first and second orders of the series of colours observed and tabulated by Newton as characteristic of thin films of air of increasing thickness. These facts have been known for a considerable time, but though the interference colours of thin films of air and those of the oxide film are produced in the same order, grave doubts have existed as to whether interference was the cause of the colours shown by the copper. This problem has been approached from measurements of the intensity of the light reflected from copper oxide films of known thickness, and the results show that interference is actually the cause of the production of the colour, though the result is complicated by the opacity of the film, the dispersion of the oxide, and the scattering of the light complementary to the film colour when the metal is burnished.

scholarly journals Effect of nonthermal plasma treatment on surface chemistry of commercially-pure titanium and shear bond strength to autopolymerizing acrylic resin

2016 ◽  
Vol 60 ◽  
pp. 37-44 ◽  
Author(s):  
Aljomar José Vechiato-Filho ◽  
Isabella da Silva Vieira Marques ◽  
Daniela Micheline dos Santos ◽  
Adaias Oliveira Matos ◽  
Elidiane Cipriano Rangel ◽  
...  
Keyword(s):  
Bond Strength ◽  
Surface Chemistry ◽  
Plasma Treatment ◽  
Shear Bond Strength ◽  
Pure Titanium ◽  
Nonthermal Plasma ◽  
Acrylic Resin ◽  
Commercially Pure Titanium ◽  
Commercially Pure

Effect of silane and alkali treatment on the shear bond strength of acrylic resin to two Co-Cr alloys

2020 ◽  
Vol 47 (1) ◽  
pp. 51-62
Author(s):  
Hyun-Jun Shin ◽  
Byung-Sik Kim ◽  
Min-Jeong Kim ◽  
Jung-Yun Ha ◽  
Tae-Yub Kwon ◽  
...  
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Alkali Treatment ◽  
Acrylic Resin

Effect of microwave treatment on the shear bond strength of different types of commercial teeth to acrylic resin

Gerodontology ◽  
2010 ◽  
Vol 27 (3) ◽  
pp. 236-242 ◽  
Author(s):  
Rafael L. X. Consani ◽  
Mariana R. Carmignani ◽  
Marcelo F. Mesquita ◽  
Lourenço Correr-Sobrinho ◽  
Ricardo D. Guiraldo
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Acrylic Resin ◽  
Microwave Treatment ◽  
Different Types
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