Huizhou Pengchengrui Technology Co., Ltd.

The core reason for choosing nickel titanium alloy for root canal files

1、 Super elasticity (core advantage)

Nickel titanium alloy has shape memory and superelastic properties:

• After filing and pre bending, it enters the bent root canal and is bent and deformed by external force. Releasing the external force can automatically rebound and restore its straight shape;

• Stainless steel files have extremely strong rigidity and can cause permanent deformation when bent. Forcefully unclogging the bent root canal is extremely easy, such as creating steps, side threading, straightening the root canal, and root tip deviation.

• Only nickel titanium can conform to the original root canal direction and maintain the original anatomical shape in complex curved root canals (molars, premolars curved roots).

2、 High flexibility, significantly reducing the risk of file breakage and root canal displacement

Stainless steel has high hardness, brittleness, and rigidity. When encountering root canal bending or narrow resistance, stress concentration occurs, making it easy to get stuck and break;

Nickel titanium material is flexible and can buffer the resistance of the root canal wall. It has a higher tolerance rate for intraoperative violent operations and a much lower incidence of clinical file breakage compared to stainless steel hand files.

3、 Better fatigue resistance than stainless steel, suitable for continuous/reciprocating motion in machines

The expansion motor rotates back and forth at high speed, causing the equipment to repeatedly bend, and stainless steel is prone to metal fatigue fracture;

Nickel titanium is resistant to cyclic bending fatigue and suitable for continuous preparation of machine systems. One file can complete the entire root canal forming process, greatly improving efficiency.

4、 High cutting efficiency and shortened clinical operation time

Nickel titanium files can be designed with large taper spiral blades (ProTaper, WaveOne, etc.):

-Cutting dentin is faster;

-Smooth and continuous taper molding, better sealing performance of hot tooth glue filling in the later stage;

The cutting efficiency of stainless steel K-files is low, and the entire process relies on manual twisting and pulling, which takes a long time to prepare a single molar.

5、 Low root canal wall stress reduces postoperative pain

The rigid compression of the root canal wall by stainless steel files can easily cause microcracks in the dentin, root tip irritation, and a high probability of postoperative swelling and pain;

Nickel titanium flexible cutting has less mechanical stimulation on periapical tissues and lighter postoperative reactions.

6、 Self centered design, not easy to get stuck or offset

After optimizing the thread and cross-section of the nickel titanium file, the cutting force is uniform and it can automatically center within the root canal;

Stainless steel files have high cutting force on one side and are prone to bending towards the outer side, causing excessive cutting on one side of the root canal wall.

The only advantage of stainless steel files, nickel titanium short board (supplementary understanding)

• Advantages of stainless steel: extremely high hardness, stronger penetration when dredging extremely calcified and occluded root canals, often used for initial dredging of small sizes 10/08;

• Nickel titanium short plate: Low hardness, unable to forcefully chisel calcified hard dentin, excessive use will cause plastic deformation; It has a fatigue life and must be replaced after reaching the number of uses, resulting in higher costs.

summary

• Initial narrow calcified root canal: stainless steel manual K file;

• Root canal shaping, bending root canal, and machine expansion preparation: Nickel titanium files are the preferred choice, relying on super elasticity and flexibility to protect the original root canal anatomy, reduce complications, and improve the quality of preparation and filling.

Huizhou Pengchengrui produces precision medical products - oral root canal contusion, with precision error controlled within 2 threads.