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Surface modification method of NiTi alloy martensitic root canal file

A technology of surface modification and root canal filing, applied in metal material coating process, ion implantation coating, coating and other directions, can solve the problem that the toughness of the bonding coating cannot be effectively guaranteed, and the mechanical properties of the coating are not ideal bonding strength, etc. It can solve the problem of unsatisfactory bonding strength, excellent superelasticity and high hardness, and improve the cutting efficiency.

Active Publication Date: 2015-05-20
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coating prepared by the above technology can improve the surface properties of the root canal file to a certain extent, but the mechanical properties of the coating itself and the bonding strength between the coating and the substrate are not ideal, especially for the NiTi files in the process of curved root canal preparation. In the case of large deformation of the pipe file, the combination between the coating and the substrate and the toughness of the coating itself cannot be effectively guaranteed

Method used

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  • Surface modification method of NiTi alloy martensitic root canal file
  • Surface modification method of NiTi alloy martensitic root canal file

Examples

Experimental program
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Effect test

specific Embodiment approach 1

[0018] (1) Use the coated metal element as the sputtering target, and install it on the corresponding target position of the magnetron sputtering equipment; (2) Place the NiTi alloy martensitic root canal file on the sample stage of the vacuum chamber, and draw Vacuum to 1×10 -4 ~1×10 -5 Pa, filled with argon gas to a vacuum degree of 0.1-0.5Pa, sputtering and depositing a metal coating under the conditions of a sputtering power of 50-600W and a distance between the target and the substrate of 20-200mm; (3) depositing metal-coated root canal files in a vacuum of not less than 10 -3 Annealing treatment is carried out under Pa condition, and the annealing temperature is 600-900°C; (4) pickling is used to remove the residual metal coating on the surface, and a NiTi alloy root canal file with the parent phase on the surface and martensite inside can be obtained.

specific Embodiment approach 2

[0019] (1) Choose to use high-purity metal Ni as the sputtering target, and install it on the corresponding target position of the magnetron sputtering equipment. (2) Place the NiTi alloy martensitic root canal file on the sample stage of the vacuum chamber, and evacuate to 1×10 -4 ~1×10 -5 Pa, filled with argon gas to a vacuum of 0.1-0.5Pa, sputtering and depositing a metal coating under the conditions of a sputtering power of 50-600W and a distance between the target and the substrate of 20-200mm; during the sputtering process, the sample The table rotates axially around the root canal file while rotating around the central axis of the vacuum chamber. (3) The root canal files deposited with metal Ni coating should be kept at a vacuum degree of not less than 10 -3 The annealing treatment is carried out under the condition of Pa, the annealing temperature is 600-900°C, and the annealing time is 15min-120min. (4) Place the annealed root canal file in dilute nitric acid solut...

specific Embodiment approach 3

[0021] The difference between the present embodiment and the second embodiment is that the high-purity metal V is used as the target in the step (1) of the present embodiment.

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Abstract

The invention provides a surface modification method of a NiTi alloy martensitic root canal file. According to the method, a metal coating is deposited on the surface of the root canal file by use of a magnetic sputtering process; annealing treatment is performed under the conditions that a vacuum degree is not lower than 10<-3>Pa and the temperature is 600-900 DEG C, so that the metal elements of the coating are diffused to enter a martensitic root canal file substrate, the surface of the root canal file is a parent phase at the operating temperature, and martensite is formed inside the root canal file. The surface modification method is provided mainly for solving the problems of low strength and non-ideal cutting efficiency of the NiTi alloy martensitic root canal file. The surface modification method is also used for solving the problem of low bonding strength between the coating and the substrate of the root canal file. The surface modification method is simple in process, and low in requirements on equipment; the prepared root canal file has the advantages of high cutting efficiency, high fatigue resistance and the like.

Description

technical field [0001] The invention relates to a surface modification method of NiTi alloy. Background technique [0002] The root canal file is one of the most frequently used instruments in dental clinics. It is mainly used for the preparation and shaping of the root canal of the tooth, and is of great significance to ensure the success of the root canal treatment. In recent years, NiTi alloy root canal files have gradually been favored by dentists due to their good flexibility and elasticity. According to the state of NiTi alloy during use, NiTi alloy root canal files can be divided into superelastic root canal files and martensitic root canal files. NiTi alloy superelastic root canal files have the characteristics of good flexibility, but their fatigue resistance is poor, and they are prone to accidental breakage during use, and this breakage often occurs without any warning. To this end, the researchers developed a martensitic root canal file, which has a lower elast...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/35C23C14/16C23C14/58
CPCC23C14/165C23C14/35C23C14/5806
Inventor 佟运祥李莉郑玉峰周惠敏
Owner HARBIN ENG UNIV
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