Micro Hardness Difference After Stainless Steel Bracket Heat Treatment Using a Mini Torch at Different Durations (Laboratory Test)

Prinitasya Zitta Amanda; Erwin Siregar; Heru Setyo Anggani

Authors

Prinitasya Zitta Amanda Universitas Indonesia Author
Erwin Siregar Universitas Indonesia Author
Heru Setyo Anggani Universitas Indonesia Author

Keywords:

heat treatment, micro hardness, duration

Abstract

Stainless Steel (SS) brackets are the most widely used brackets in fixed orthodontic treatment because they have advantages, including being strong, inexpensive, and resistant to corrosion, and can be repeated several times. Bracket recycling is an option for orthodontists when brackets need to be reattached to the tooth. The advantage of bracket recycling is that it is more economical. The most common and easily used by clinicians is heat treatment. The mini torch was used in the bracket recycling process at the Orthodontic Clinic, Dental and Oral Hospital, University of Indonesia. This study aims to determine the differences in the microhardness of the SS brackets after burning using a mini torch at different durations. Objective: To find out the difference in the hardness level of the SS bracket with a burning duration of 5, 7, and 10 seconds. Methods: Laboratory experiment in September 2022 at the Mechanical Engineering Thermodynamics Laboratory, Faculty of Engineering, the University of Indonesia for bracket heat treatement and the micro hardness test stage was carried out at CMPFA (Center for Materials Processing and Failure Analysis), consisting of 15 brackets with a control group of 1 bracket. Results: One-way ANOVA test with a value of P <0.05 indicates a difference in the micro hardness of the bracket with a heat treatment duration of 5, 7, and 10 seconds. The highest average bracket hardness was found in 10 seconds of heat treatment, with an average value of 347.46 HV. Conclusion: There are differences in bracket hardness with different heat treatment durations.

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