Bond strength and feasibility, Ni–Cr alloys, Recycled alloys
Citation Information :
Jhansi R, Reddy AV, Prasad KS, Kiran YS, Sundeep D. A Comparative Assessment of Flexural Bond Strength of Ni–Cr Metal–Ceramic Alloy on Repeated Castings. Int J Prosthodont Restor Dent 2019; 9 (3):70-76.
Aim: The present work is aimed to evaluate and compare the metal–ceramic bond strength and clinical feasibility of three commercially available Ni–Cr alloys with different compositions before and after recasting. The hypothesis of this experiment is to evaluate the effect of the recasting of base metal alloys in the physical and chemical properties of alloys, which in turn affect the metal–ceramic bond strength. Materials and methods: In the present experiment, we considered 60 Ni–Cr metal samples, which were divided into group I and group II with every 30 samples. Group I consists of 30 samples fabricated with 100% new alloy, and group II consists of 30 samples fabricated with 100% recycled alloy. Groups I and II are further divided into three subgroups IA, IB, IC and IIA, IIB and IIC on the basis of three brands of Ni–Cr alloy as NDN as (A), soft alloy as (B) and superbond as (C) with each of 10 samples. Metal sprues and buttons obtained after casting of group I samples were used as a recast alloy for the fabrication of group II samples. Results: The flexural bond strength of the fabricated metal–ceramic samples was subjected to three points bending test in a universal testing machine. The obtained values were statistically analyzed using one-way analysis of variance and post hoc Tukey analysis. The morphological studies are the stereomicroscopic examination of all the samples revealed alloy–metal oxide disjunction failure. Conclusion: The mean flexural bond strength for all the groups was above the minimum requirement by American Dental Association (ADA) specification no. 38 and ISO specification 9693. The mean bond strength of group I samples is found to be greater than the group II samples. The soft alloy and superbond have the highest mean bonds when compared among the samples fabricated with 100% new alloy and 100% recycled alloy. Superbond and soft alloy are followed by former and later, and NDN is found to be least for both types. The soft alloy has more reduction in metal–ceramic bond strength in group II (samples fabricated with 100% recycled alloy) when compared to group I.
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