* Corresponding Author
Effect of Co-Cr alloy recasting on the fracture toughness
https://doi.org/10.22146/majkedgiind.53689 Resti Efrata Eka(1*), Rini Dharmastiti(2), Widjijono Widjijono(3)
(1) Faculty of Dentistry, Institut Ilmu Kesehatan Bhakti Wiyata Kediri, Kediri, East Java Magister of Dental Science, Faculty of Dentistry, Universitas Gadjah Mada, Yogyakarta
(2) Department of Mechanical and Industrial Engineering, Faculty of Engineering, Universitas Gadjah Mada, Yogyakarta
(3) Departement of Biomaterials, Faculty of Dentistry, Universitas Gadjah Mada, Yogyakarta
(*) Corresponding Author
Abstract
Frame denture generally uses Co-Cr alloy. However, alloy is expensive, so dental laboratories use residual sprue casting for recasting. The purpose of this study was to determine the effect of Co-Cr alloy recasting on fracture toughness. This was a laboratory experiment, with five sample groups, namely R0: 100% of new alloys; R1: 50% one-time recasting procedure and 50% new alloys, R2: 50% two-time recasting procedure and 50% new alloys, R3: 50% three-time recasting procedure and 50% new alloys, R4: 50% four-time recasting procedure and 50% new alloys. Fracture toughness was tested using a universal testing machine; the data were analyzed by One-Way Anova test and LSD (p>0.05). The results showed that the fracture toughness was 233.103 MPa-m1/2 in R4, and the highest was 242.435 MPa-m1/2 in R0. The results of the analysis by the LSD test on fracture toughness showed that there were no significant differences in R0 with R1 and R2, but there were significant differences between R0 with R3 and R4. There was a decrease after recasting in each group because of the missing elements of the Co-Cr alloy. The percentage of each element decreased due to oxidation and evaporation during heating. There was a change in the composition of the Co-Cr alloy in R3 and R4. There was a decrease in the fracture toughness. Variation in recasting frequency of Co-Cr alloy affected the fracture toughness. In each sample groups, the fracture toughness of Co-Cr alloy decreased after recasting.
Keywords
Full Text:
PDFReferences
1. Qian C, Wu X, Zhang F, Yu W. Electrochemical impedance investigation of Ni-free Co-Cr-Mo
and Co-Cr-Mo-Ni dental casting alloy for partial removable dental prosthesis frameworks. J
Prosthet Dent. 2016; 116(1): 112–118. doi: 10.1016/j.prosdent.2015.12.001
2. McCabe JF WA. Applied Dental Materials. 9nd ed. Oxford: Blackwell Publishing Ltd;
2008.
3. Carr AB BD. Removeable Partial Denture. 12th ed. Mosby: Elsevier; 2011.
4. Anusavice KJ, Shen C RH. Philip’s: science of dental materials. Ed.12. Louis: Saunders;
2013.
5. David R. Introduction to Fracture Mechanics. Departement of Materials Science and
Engineering Massachusetts Institute of Technology Cambridge; 2001.
6. Tuna SH, Ozcicek PN, Kurkcuollu I. Corrosion resistance assessment of Co-Cr alloy
frameworks fabricated by CAD/CAM milling, laser sintering, and casting methods. J
Prosthet Dent. 2015; 114(5): 725–734. doi: 10.1016/j.prosdent.2015.02.031
7. Sakaguchi R, Ferracane J PJ. Restorative dental materials. 14th ed. Missouri: Mosby An
Imprint of Elsevier; 2012.
8. Viennot S, Dalard F, Malquarti G, Grosgogeat B. Combination fixed and removable prostheses
using a CoCr alloy: a clinical report. J Prosthet Dent. 2006; 96(2): 100–103. doi: 10.1016/j.
prosdent.2006.04.013
9. Vaillant-Corroy AS, Corne P, De March P, Fleutot S, Cleymand F. Influence of recasting
on the quality of dental alloys: a systematic review. J Prosthet Dent. 2015; 114(2): 205–
211. doi: 10.1016/j.prosdent.2015.02.004
10. Aziz A, Kheraif A, Ramamoorthi M. Fatigue behaviour of recasted removable partial
denture alloys. 2011; 3(4): 20–2.
11. Gupta S, Mehta AS. The effec of remelting various combination of new and ured cocr
alloy on the mechanical properties and microstructure of the alloy. Indian J Dent Res.
2012; 23(3): 341–347. doi: 10.4103/0970-9290.102220
12. Jittin J, Jose J, Rahul J, Philip GB, Devassy JP, Reba PB. Effect of recasting on physical
properties of base metal alloy : an in vitro study. J Int Soc Prev Communit Dent. 2018;
8(5): 457–462. doi: 10.4103/jispcd.JISPCD_237_18
13. Yilmaz B, Ozcelik TB, Johnston WM, Kurtulmus-Yilmaz S, Company AM. Effect of
alloy recasting on the color of opaque porcelain applied on different dental alloy systems. J
Prosthet Dent. 2012; 108(6): 362–369. doi: 10.1016/S0022-3913(12)60193-0
14. Meenakshi T, Bharathi M, Komala J. Evaluation of the effect of recasting nickelchromium
base metal alloy on the metalceramic bond strength: An in vitro study. J
Contemp Dent Pract. 2017; 18(9): 837–841. doi: 10.5005/jp-journals-10024-2136
15. Khalaf HM, Al Ameer SS, Alsaady AA. The effect of recasting on the Fatigue resistance
of Co-Cr alloys. MDJ. 2008; 5(2): 205–212.
DOI: https://doi.org/10.22146/majkedgiind.53689
Article Metrics
Abstract views : 1070
| 
views : 1062
Refbacks
- There are currently no refbacks.
Copyright (c) 2021 Majalah Kedokteran Gigi Indonesia
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.