Influence of heat treatment on the mechanical properties of CrNi stainless steel orthodontic wires

Abstract

Introduction: The heat treatment of stainless steel wires is a routine clinical procedure adopted by many dentists in order to relieve the stress caused after performing bends in the archwire. Objective: This study aimed to evaluate the influence of heat treatment of stainless steel archwires with a rectangular section of 0.016 x 0.022’-in. Methods: For analysis of the dimensional stability, the anterior and posterior dimensions of forty 0.016 x 0.022-in stainless steel orthodontic archwires without heat treatment and 30 days after heat treatment were evaluated. For analysis of the mechanical properties, 12 stainless steel wire segments with the same rectangular section without heat treatment and 30 days after heat treatment were tested through tensile strength and strain tests. To evaluate if there were differences between the anterior and posterior dimensions, the results were analyzed by the Student’s t-test. To compare the tensile strength and strain between the groups, the ANOVA test was used. The level of significance adopted was 95% (p< 0.05). Results: The heat treatment did not stop the expansion of archwires 30 days after their preparation, and there was no statistical difference in the tensile strength and strain tests with and without heat treatment. Conclusion: From the findings of this study, it can be conclude that the mechanical behavior of heat-treated stainless steel archwires is similar to that of archwires not subjected to heat treatment.

The effect of electro-thermal treatment of stainless steel arch wire on mechanical properties and cell proliferation

“…The use of electrical heat treatment for orthodontic arch wires is advocated [9][10][11][12][13] and dental spot welders are commercially available to deliver the electrothermal treatment. In recent years, research assessing electrothermal treatment has gradually increased [9][10][11][12][13] and identified problems that currently remain unresolved. A uniform treatment heating time/ Yingzhi Gu: drguyingzhi@163.com; Xianju Xie: dentist.x@163.com; Hongmei Wang: wanghongmei0407@aliyun.com; Rui Zhuang: zhuangrui_jn@163.com; Yuxing Bai: byuxing@ccmu.edu.cn power setting standard that corresponds to a heating temperature is unavailable.…”

“…The use of electrical heat treatment for orthodontic arch wires is advocated [9][10][11][12][13] and dental spot welders are commercially available to deliver the electrothermal treatment. In recent years, research assessing electrothermal treatment has gradually increased [9][10][11][12][13] and identified problems that currently remain unresolved.…”