Effect of fluoride on mechanical properties of NiTi and CuNiTi orthodontic archwires: an in vitro study.

Autor:	Mane P; Krishna Institute of Medical Sciences, School of Dental Sciences, Department of Orthodontics and Dentofacial Orthopedics (Malkapur, Karad/MH, India)., Ganiger CR; Krishna Institute of Medical Sciences, School of Dental Sciences, Department of Orthodontics and Dentofacial Orthopedics (Malkapur, Karad/MH, India)., Pawar R; Krishna Institute of Medical Sciences, School of Dental Sciences, Department of Orthodontics and Dentofacial Orthopedics (Malkapur, Karad/MH, India)., Phaphe S; Krishna Institute of Medical Sciences, School of Dental Sciences, Department of Orthodontics and Dentofacial Orthopedics (Malkapur, Karad/MH, India)., Ronad YA; Krishna Institute of Medical Sciences, School of Dental Sciences, Department of Orthodontics and Dentofacial Orthopedics (Malkapur, Karad/MH, India)., Valekar S; Krishna Institute of Medical Sciences, School of Dental Sciences, Department of Orthodontics and Dentofacial Orthopedics (Malkapur, Karad/MH, India)., Kanitkar AA; Bharati Vidyapeeth Dental College & Hospital, Department of Prosthodontics (Sangli/MH, India).
Jazyk:	angličtina
Zdroj:	Dental press journal of orthodontics [Dental Press J Orthod] 2021 Apr 30; Vol. 26 (2), pp. e212020. Date of Electronic Publication: 2021 Apr 30 (Print Publication: 2021).
DOI:	10.1590/2177-6709.26.2.e212020.oar
Abstrakt:	Introduction: After debonding, white spot may appear on the area below the bracket, which is the early clinical sign of carious lesion. There is increased caries risk underneath and adjacent to orthodontic bands and brackets, which call for maximum use of caries preventive procedures using various fluoride application methods. Objective: The aim of the study was to evaluate alterations in the mechanical properties (modulus of elasticity and yield strength) in loading and unloading phases for different orthodontic archwires (nickel-titanium [NiTi] and copper-nickel-titanium [CuNiTi]) when exposed routinely to fluoride prophylactic agents for a predetermined period of time. Methods: Preformed rectangular NiTi and CuNiTi wires were immersed in fluoride solution and artificial saliva (control) for 90 minutes at 37ºC. After immersion, specimens were tested using a 3-point bend test on a universal testing machine. Results: There is a significant reduction in the unloading yield strength when the NiTi and CuNiTi wires were exposed to APF gel. Conclusion: The result suggests that use of topical fluoride agents affect the mechanical properties of the wires, leading to increase in treatment duration. Fluoride prophylactic agents must be used with caution in patients undergoing orthodontic treatment. Injudicious use of these agents may cause corrosive effects on the orthodontic wire surfaces, with alteration in their mechanical properties.
Databáze:	MEDLINE
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