MECHANICAL PROPERTY CHANGES IN ORTHODONTIC WIRES AFTER EXPOSURE TO CHLORHEXIDINE MOUTHWASH: A REVIEW STUDY

Abstract

Orthodontic wires, especially nickel-titanium (NiTi) and stainless steel (SS), are widely used in clinical orthodontics due to their favorable mechanical properties. However, these materials are prone to degradation when exposed to chemical agents commonly used in oral hygiene, such as chlorhexidine (CHX). This review aims to assess the effects of chlorhexidine mouthwash exposure on the mechanical properties and corrosion resistance of different orthodontic wire types. A comprehensive review of published studies was conducted, focusing on in vitro investigations evaluating changes in tensile strength, surface morphology, ion release, and corrosion behavior of orthodontic wires following exposure to various concentrations and durations of CHX. Most studies found that CHX, especially in higher amounts or with longer exposure, greatly changes the surface texture and weakens the strength of NiTi and SS wires. Exposure to CHX also showed a likelihood of corrosion and release of ions that could affect how well it works in real-life situations and the safety of patients involved. Extended use of wires with chlorhexidine mouthwash could affect their strength and ability to resist corrosion, so it is important to be careful in recommending CHX based mouth rinses for orthodontic treatment.