The effect of thermal and mechanical cycling on bond strength of a ceramic to nickel-chromium (Ni-Cr) and cobalt-chromium (Co-Cr) alloys

Vojdani, Mahroo; Shaghaghian, Soheila; Khaledi, Amir Alireza; Adibi, Sadaf

doi:10.4103/0970-9290.104960

Cited by 15 publications

(8 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Additionally, thermal cycling with its successive temperature changes during water immersion, induces repeated stress that weakens the bond between metal and ceramic, due to the difference between these materials' coefficients of thermal expansion leading to different rate of expansion/contraction of the two materials which could affect SBS. [41] Regarding the effect of thermo-mechanical cycling on SBS values, the results of current study were in agreement with Vojdani et al (2012) [50] who evaluated the effect of thermo-mechanical cycling on the bond strength of a ceramic to three Co-Cr and two Ni-Cr alloys, and observed that thermomechanical fatigue condition has decreased the bond strength of Ni-Cr and Co-Cr alloys to the ceramic. However, they proved that the MC samples still have adequate bond strength for clinical performance of the restorations.…”

Section: Discussionsupporting

confidence: 91%

Effect of thermo-mechanical cycling on the shear bond strength of porcelain to milled and cast cobalt-chromium alloys

Asaad

2019

Egyptian Dental Journal

View full text Add to dashboard Cite

Statement of problem: Most of the failures in metal-ceramic restorations occurs at the interface between the two materials. For long term clinical performance, these restorations should have adequate bond strength between metal and ceramic. Few data is available in regards to the metal-ceramic bond strength of Cobalt Chromium (Co-Cr) alloys fabricated by computer aided designing design/computer aided manufacturing CAD/CAM technology. Purpose of the study: The purpose of this in vitro study was to explore the influence of Co-Cr fabrication techniques on shear bond strength of porcelain to milled and cast Co-Cr alloys and to evaluate failure mode with & without thermo-mechanical cycling. Materials & Methods: A total of 20 disc samples (10 mm diameter x 4 mm thickness) were fabricated of Co-Cr alloy and divided into two groups (10 discs each) according to their fabrication technique: Group I: fabricated by CAD/CAM milling and Group II: fabricated by conventional casting. Then porcelain build up for all discs (10 mm diameter x 2mm thickness) was done using feldspathic porcelain. Each group was subdivided according to discs' exposure to thermomechanical cycling into two subgroups (5 discs each). Subgroup A : without thermo-mechanical cycling and Subgroup B: with thermo-mechanical cycling. All the disc samples were subjected to the shear bond strength (SBS) test and the failure mode was investigated under digital microscope at 40 X. Data were statistically analyzed using Independent sample t-test and Two-way ANOVA test (P ≤ 0.05). Results: The results showed that the fabrication techniques were statistically insignificantly affecting the SBS of both CAD/CAM milled and conventional casting groups. Regarding the thermo-mechanical cycling, the CAD/CAM milled and conventional casting groups without thermo-mechanical cycling showed a statistically significantly higher SBS than those with thermomechanical cycling. Failure mode was mixed type for all disc samples. Conclusions: Fabrication technique of Co-Cr alloy had no significant effect on SBS. Thermomechanical cycling of milled and cast Co-Cr samples significantly affecting SBS with the superiority of the non-thermo-mechanical cycled samples. All the tested samples showed SBS values within the clinically acceptable levels. CAD/ CAM fabricated Co-Cr may be considered a promising alternative to conventional cast Co-Cr for metal ceramic prosthesis in terms of SBS.

show abstract

Section: Discussionsupporting

confidence: 91%

Effect of thermo-mechanical cycling on the shear bond strength of porcelain to milled and cast cobalt-chromium alloys

Asaad

2019

Egyptian Dental Journal

View full text Add to dashboard Cite

show abstract

“…There was no significant difference among the shear bond strength between the base metal alloys and the porcelain tested. 7 This is consistent with an earlier study by Alfredo Julio Fernandez 8 and a recent study by Vojdani M et al 9 .…”

Section: Discussionsupporting

confidence: 83%

Comparative Evaluation of the Bond Strength of Different Base Metal Alloys With Porcelain-An Invitro Study

Rajesh¹,

Raghavan²,

Sreelal³

et al. 2017

IOSR JDMS

View full text Add to dashboard Cite

Results: Student't' test revealed no significant difference in the porcelain bond strength between nickelchromium and cobalt-chromium alloys-Commend and Lithecast respectively. Conclusion: Within the limitations of the study, no significant difference was noted between nickel-chromiumand cobalt-chromium alloy with respect to the bond strength with porcelain. Hence taking into consideration the economic effectiveness of nickel-chromium alloys, they can be used as the core material for metal-ceramic restorations in place of cobalt-chromium alloys except in nickel-allergic patients.

show abstract

“…The technique of increasing this temperature is based on the hypothesis that there is an increase in electron transference between the glass and metal oxides [29]. On the other hand, Vojdani [23] evaluates in a recent study the effect of thermo-mechanical cycling (TMC) on the bond strength of a ceramic to three cobalt-chromium (Co-Cr) and two nickel-chromium (Ni-Cr) alloys, and they observed the thermo-mechanical fatigue condition decreases the bond strength of Ni-Cr and Co-Cr alloys to the ceramic. However, the authors affirmed the tested metal-ceramic systems still show sufficient bond strength for clinical performance of the restorations and the effect of thermo-mechanical cycling was relatively the same for all the tested base metal-ceramic systems.…”

Section: Discussionmentioning

confidence: 99%

“…Although the effect of fatigue conditions on flexural bond strength of ceramics to basic metal and gold alloys has been verified by several studies [13,14,16,17,[21][22][23], there is no investigation concerning about the combined effect of a bonding agent and the thermo-mechanical cycling on the bond strength of dental ceramics to metal alloys. Therefore, the present study aimed to evaluate the in vitro influence of a bonding agent and thermo-mechanical cycling on the flexural bond strength between a ceramic and a gold or cobalt-chromium alloy.…”

Section: Introductionmentioning

confidence: 99%

The effect of a bonding agent and thermo-mechanical cycling on the bond strength of a glass-ceramic to gold and cobalt-chromium alloys

et al. 2014

View full text Add to dashboard Cite

To evaluate the effects of bonding agent and thermo-mechanical cycling on the flexural bond strength of a gold and cobalt-chromium alloy to a feldspathic ceramic. Sixty-four metal bars were fused (3 × 25 × 0.5 mm 3 ): 32 with a gold alloy and 32 with a cobalt-chromium (Co-Cr) alloy. Over the bars' central area (8 × 3 mm 2 ), a bonding agent and two glass-ceramic layers were fired, totaling 1 mm in ceramic thickness. Eight specimens of each alloy were randomly divided according to the bonding agent (application or the absence thereof) and the thermo-mechanical cycle (3,000 thermo-cycles and 20,000 mechanical-cycles; or no cycling). The flexural bond strength between the metal alloy and the ceramic was evaluated by a three-point bending test and data were subjected to three-way ANOVA and Tukey's test (α = 0.05). The failure mode was classified. No significant interactions were observed among the three factors evaluated (alloy, bonding agent, and thermo-mechanical cycling; p = 0.5734). There was no statistically significant difference between the alloys (p = 0.8559). The interaction between alloy/bonding agent (p = 0.0001) showed that, for the gold alloy, the group with the bonding agent showed mean values of flexural bond strength significantly higher than those of the group without the bonding agent, while, for the Co-Cr alloy, the groups with or without bonding agent had similar mean values of flexural bond strength. The interaction between alloy/thermo-mechanical cycling (p = 0.0001) showed that, for the gold alloy, the non-cycled group had flexural bond strength mean values significantly greater than those of the cycled group, while for the Co-Cr alloy, both non-cycled and cycled groups had similar mean values. The bonding agent significantly improved the flexural bond strength between the ceramic and the gold alloy, but had no influence on the Co-Cr alloy. Thermo-mechanical cycling decreased the flexural bond strength of the gold alloy specimens, but did not affect the Co-Cr specimens.

show abstract

The effect of thermal and mechanical cycling on bond strength of a ceramic to nickel-chromium (Ni-Cr) and cobalt-chromium (Co-Cr) alloys

Abstract: It may be concluded that base metal-ceramic bond strength is affected by aging and the effect is relatively the same for all the tested porcelain-metal systems.

Cited by 15 publications

References 0 publications

Effect of thermo-mechanical cycling on the shear bond strength of porcelain to milled and cast cobalt-chromium alloys

Effect of thermo-mechanical cycling on the shear bond strength of porcelain to milled and cast cobalt-chromium alloys

Comparative Evaluation of the Bond Strength of Different Base Metal Alloys With Porcelain-An Invitro Study

The effect of a bonding agent and thermo-mechanical cycling on the bond strength of a glass-ceramic to gold and cobalt-chromium alloys

Contact Info

Product

Resources

About