Salt bath nitrocarburizing modifying method for surface of orthodontics arch wire

An orthodontic arch wire and nitrocarburizing technology is applied in the field of surface modification of biomedical materials to meet the needs of surface modification and clinical application, good biocompatibility, and improved corrosion resistance.

Inactive Publication Date: 2014-02-12
NANJING MEDICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Recent studies have shown that nitrocarburizing on the surface of medical titanium alloys can significantly improve the wear resistance of the alloy, but there is no report on the surface modification of austenitic stainless steel arch wires for orthodontics using salt bath nitrocarburizing technology.

Method used

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  • Salt bath nitrocarburizing modifying method for surface of orthodontics arch wire
  • Salt bath nitrocarburizing modifying method for surface of orthodontics arch wire
  • Salt bath nitrocarburizing modifying method for surface of orthodontics arch wire

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Embodiment 1

[0022] The present invention is realized through the following steps: (1) pretreatment of the surface of the arch wire, followed by ultrasonic cleaning in ethanol, acetone, and distilled water for 10 minutes to remove oil stains; (2) using a special penetrating agent for austenitic stainless steel on the pretreated arch wire Carry out salt bath nitrocarburizing, the salt bath temperature is 565°C, and the treatment time is 10 minutes; (3) The arch wire after nitrocarburizing treatment is cooled at room temperature for 30 minutes, and then ultrasonically cleaned with ethanol and acetone in sequence to obtain low surface friction Power stainless steel arch wire. The orthodontic arch wire is an austenitic stainless steel orthodontic arch wire, and the size of the arch wire is 0.019×0.025 feet (0.48×0.64mm). Wherein step (two) described austenitic stainless steel special penetration agent contains 16%wtK 2 CO 3 , 24%wtKCl and 60%wt urea, CNO - The mole fraction is controlled at...

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Abstract

The invention discloses a salt bath nitrocarburizing modifying method for a surface of an orthodontics arch wire. The method comprises the steps of pretreatment for the arch wire surface: ultrasonically cleaning the arch wire surface in ethanol, acetone and distilled water for 10min to remove oil stain; implementing salt bath nitrocarburizing to the pre-treated arch wire through austenitic stainless steel special impregnant for 10-30min at 565 DEG C; cooling the nitrocarburized arch wire for 30min at room temperature, and ultrasonically cleaning by ethanol and acetone sequentially to obtain surface low-friction stainless steel arch wire. The stainless steel arch wire prepared by the technical scheme is improved in surface friction performance and corrosion resistance, and has excellent biocompatibility, so as to meet requirements of the orthodontics arch wire on surface modification and clinical application.

Description

technical field [0001] The invention relates to the technical field of surface modification of biomedical materials, and in particular provides a method for modifying the surface of an orthodontic archwire with salt bath nitrocarburizing. Background technique [0002] In the process of orthodontic fixed treatment, the friction force is generated along with the relative movement between the bracket and the arch wire. The correction force exerted by the appliance must overcome the friction force before it can act on the teeth. Teeth move. With the widespread application of sliding mechanisms in fixed orthodontics, the friction generated during the orthodontic process is particularly important. The greater the friction force, the smaller the actual orthodontic force ratio of tooth displacement, which in turn affects the performance and efficiency of the appliance. The orthodontic concept generally advocated by the orthodontics today is light-force orthodontics. In order to ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/56
Inventor 马俊青王林张昊倪洁丽郭舒瑜
Owner NANJING MEDICAL UNIV
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