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ORIGINAL ARTICLE
Year : 2013  |  Volume : 2  |  Issue : 1  |  Page : 36-41

Evaluation of shear bond strength and microleakage of two repair systems for porcelain fused metal restoration


1 Govt Medical College, Anantapur, India
2 Department of Prosthodontics, Meghna Institute of Dental Sciences, Nizamabad, Andhra Pradesh, India
3 Department of Prosthodontics, SRM Dental College, Chennai, India

Correspondence Address:
A Kalyan Chakravarthy
Department of Prosthodontics, Meghna Institute of Dental Sciences, Mallaram Village, Warni Road, Nizamabad, Andhra Pradesh
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/2277-8632.108511

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Aim: This study evaluated the shear bond strength and microleakage of two repair systems for porcelain fused metal restoration. Materials and Methods: Forty cylindrical samples were fabricated in nickel-chromium alloy and 40 samples in feldspathic porcelain. Twenty samples of Ni-Cr alloy and 20 samples of porcelain disks were embedded in the acrylic resin, except its examination surface. The remaining 20 samples of Ni-Cr alloy and 20 samples of porcelain prepared for testing microleakage were covered with double-faced transparent tape on one surface and resin composite was bonded with the CoJet-3M and Ceramic Repair-Ivoclar. The samples were stored in distilled water for 24 h at 37°C before thermocycling at 5° to 55°C for 300 cycles and again stored at 37°C for 8 days. Shear bond strength test were performed in a universal testing machine with cross head speed of 1 mm/min. The data was analyzed using one way ANOVA and the Tukey honestly significant difference (HSD) test (P < 0.05). A total of 40 samples were tested. The remaining samples were prepared for testing microleakage samples. After thermocycling, the samples were placed in 0.5% basic fuchsin solution for 24 h and washed under tap water. These samples were transversely sectioned and the split samples were examined under 10 x microscopes for better evaluation of the samples. The leakage along the interface was measured under the microscope. Later, the inter-reliability of the scores was assessed using Kappa test. The data were analyzed statistically using a non-parametric Kruskal-Wallis test. Results: Mean bond strength values for G 1 M 1 B 35.77 ± 2.52 was the highest followed by G 1 P 1 B 33.23 ± 3.24, G 2 P 2 B 32.47 ± 3.53 and the lowest showed in G 2 M 2 B 24.70 ± 2.87. Test of significant showed that the mean value was significant among the groups (P < 0.001). The bond strength of the repair systems could not be related to the degree of leakage. Conclusion: For the metal surfaces, the greatest strengths were achieved with use of the CoJet-System. The bond strength of the repair systems could not be related to the degree of leakage.


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