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VOLUME 13 , ISSUE 3 ( July-September, 2023 ) > List of Articles


Evaluation of the Effect of Varying Percentage of Recast Metal–Ceramic Alloy on Bond-strength and Oxide-layer Composition using SEM and EDX: An In Vitro Study

Ripul Pahwa, Ishita Dureja, Akshay Pahwa, Ajai Gupta

Keywords : Base metal, Bond strength, Ceramic, Energy-dispersive X-ray, Scanning electron microscope

Citation Information : Pahwa R, Dureja I, Pahwa A, Gupta A. Evaluation of the Effect of Varying Percentage of Recast Metal–Ceramic Alloy on Bond-strength and Oxide-layer Composition using SEM and EDX: An In Vitro Study. Int J Prosthodont Restor Dent 2023; 13 (3):154-162.

DOI: 10.5005/jp-journals-10019-1423

License: CC BY-NC 4.0

Published Online: 29-09-2023

Copyright Statement:  Copyright © 2023; The Author(s).


Purpose: An in vitro study to evaluate and compare the bond strength of veneered porcelain as affected by the addition of recast nickel-chromium alloy in varying percentages using the universal testing machine (UTM) and to analyze the oxide layer on the metal specimens using the scanning electron microscope (SEM) and energy-dispersive X-ray (EDX). Materials and methods: Forty disk specimens of dimension 8 × 2 mm were fabricated from Bellabond Plus alloy (Bego, Germany) using recast metal in different (n = 10 samples/group) (group I: 100% fresh metal; group IIA: 75% fresh metal and 25% recast metal; group IIB: 50% fresh metal and 50% recast metal; and group IIC: 25% fresh metal and 75% recast metal). Application of commercially available porcelain (Ceramco 3) was done up to a thickness of 2 mm. Samples were then placed under SEM for EDX examination to evaluate ionic changes that occurred at the metal–ceramic interface. Bond strength of each sample was evaluated under UTM. The statistical analysis was done using one-way analysis of variance (ANOVA) test and post hoc test. Results: The one-way ANOVA showed that for the oxide layer content, a significant difference was seen in the values of chromium, nickel, and oxygen (p < 0.001). As the content of recast metal in sample increases, there is a significant decrease in the bond strength value, thus making the metal−ceramic bond weaker (p < 0.001). On performing the Tukey honestly significant difference (HSD) test, values were significant for nickel, chromium, and oxygen in the oxide layer content among different groups of new and recasted metal alloys (p < 0.05) and were not significant for silica, aluminum, and sulfur (p > 0.05). Conclusion: As the content of recasted metal increases, there is a decrease in the bond strength and increase in oxygen content in oxide layer. An adequate bond strength of 40 MPa was not achieved if the recasted metal is >50%. Thus, the data revealed that we could use up to 50% of recasted metal for prosthesis fabrication; beyond this limit, the bond strength is not adequate for dental use.

  1. Atluri KR, Vallabhaneni TT, Tadi DP, et al. Comparative evaluation of metal-ceramic bond strengths of nickel chromium and cobalt chromium alloys on repeated castings: an in vitro study. J Int Oral Health 2014;6(5):99–103.
  2. Rathi S, Parkash H, Chittaranjan B, et al. Oxidation heat treatment affecting metal-ceramic bonding. Indian J Dent Res 2011;22(6):877–878. DOI: 10.4103/0970-9290.94664
  3. Reddy NR, Abraham AP, Murugesan K, et al. An invitro analysis of elemental release and cytotoxicity of recast nickel-chromium dental casting alloys. J Indian Prosthodont Soc 2011;11(2):106–112. DOI: 10.1007/s13191-011-0075-8
  4. Kul E, Aladag LI, Duymus ZY, et al. Comparison of the metal-ceramic bond after recasting and after laser sintering. J Prosthet Dent 2015;114(1):109–113. DOI: 10.1016/j.prosdent.2015.01.016
  5. Yavuz T. Effect of surface treatment on elemental composition of recast NiCr alloy. Mater Sci Appl 2012;3(3):163–167. DOI: 10.4236/msa.2012.33025
  6. James J, Julian J, Rahul J, et al. Effect of recasting on physical properties of base metal alloys: an in vitro study. J Int Soc Prev Community Dent 2018;8(5):457–462. DOI: 10.4103/jispcd.JISPCD_237_18
  7. Agrawal A, Hashmi SW, Rao Y, et al. Evaluation of surface roughness and tensile strength of base metal alloys used for crown and bridge on recasting (recycling). J Clin Diagn Res 2015;9(7):ZC01–ZC04. DOI: 10.7860/JCDR/2015/11535.6141
  8. Anwar M, Tripathi A, Kar SK, et al. Effect of PFM firing cycles on the mechanical properties, phase composition, and microstructure of nickel-chromium alloy. J Prosthodont 2015;24(8):634–641. DOI: 10.1111/jopr.12328
  9. Sharma A, Rodrigues SJ, Shetty TB, et al. Evaluation of effect of recasting of nickel-chromium alloy on its castability using different investment materials: an in vitro study. Indian J Dent Res 2016;27(2):190–194. DOI: 10.4103/0970-9290.183136
  10. Jayaprakash K, Kumar Shetty KH, Shetty AN, et al. Effect of recasting on element release from base metal dental casting alloys in artificial saliva and saline solution. J Conserv Dent 2017;20(3):199–203. DOI: 10.4103/0972-0707.218304
  11. Madhav VN, Padmanabhan TV, Subramnian R. Evaluation of flexural bond strength of porcelain to used nickel-chromium alloy in various percentages. Indian J Dent Res 2012;23(1):11–14. DOI: 10.4103/0970-9290.99030
  12. Soesetijo FA, Darmanto W, Prijatmoko D, et al. The effect of nickel as product of recasting nickel chromium on gingival fibroblasts apoptosis. J Int Dent Med Res 2015;8(1):25–30.
  13. Čairović A, Maksimović V, Radović K, et al. The effect of recasting on biological properties of Ni-Cr dental alloy. Srp Arh Celok Lek 2016;144(11-12):574–579.
  14. Tripuraneni SC, Namburi SK. Evaluation of genotoxicity of recycled Ni-Cr dental casting alloys: an in vitro study. J Appl Biomater Biomech 2008;6(1):47–54.
  15. Ramirez R, Lozano FE, Levano V, et al. Evaluation of the effect of recasting on the elastic modulus of Ni-Cr dental alloy structures: an in vitro study. J Int Oral Health 2022;14(2):203–208. DOI: 10.4103/jioh.jioh_289_21
  16. Gomathi G, Bindhoo YA, Sabarigirinathan C, et al. A comparative analysis of the influence of new and recast alloy combinations on castability, chemical analysis, microstructural properties of Ni-Cr Alloy. IOSR J Dent Med Sci 2018;7:43–49. DOI: 10.9790/0853-1702164349
  17. Bandela V, Kanaparthi S. Effect of recasting on the quality of dental alloys: a review. Int Med J 2021;28(1):115–117.
  18. Nandish BT, Jayaprakash K, Shetty HK, et al. The effects of recasting on the cytotoxicity of dental base metal casting alloys. J Conserv Dent 2020;23(4):412–416. DOI: 10.4103/JCD.JCD_260_20
  19. Yoo SY, Kim SK, Heo SJ, et al. Effects of bonding agents on metal-ceramic bond strength of Co-Cr alloys fabricated by selective laser melting. Materials (Basel) 2020;13(19):4322. DOI: 10.3390/ma13194322
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