What are the selling standards for endodontic file?

Root canal treatment is a special device for root canal treatment by doctors. It thoroughly removes infected pulp and infected dentin and toxic decomposition products. After root canal rinsing, disinfection, and tight filling of the root canal, it isolates bacteria from entering the root canal and prevents infection. The occurrence of periapical lesions may promote the healing of periapical diseases.

This article contains the following:

• Expanding needle

• H file

• K file

• Cyclic fatigue strength of Reciprocating files and Reciprocating Blue nickel-titanium files at different ambient temperatures

1.Expanding needle

Manual file, divided into enlarged needle, h file, k file.

Expanding needle, material: stainless steel, triangular cross section, medium cutting ability, sharp point.

Indications for use: the enlarged needle is generally used for preliminary root canal exploration due to the sharp tip, the cutting ability is weak, and the passability is strong.

Use method: Rotate with balance force method as much as possible, do not apply too much force downward.

Precautions for use: pre-bend in advance, gentle technique to avoid violence.Problems that may occur during use: due to the design of the tip, the file cannot be pressed down when it encounters resistance, otherwise it is prone to side penetration. Due to the material, even after pre-bending, the root canal will be straightened and the apex is deviated Transfer and other issues.

2.H file

H file, material: stainless steel, circular cross-section?, strong cutting ability, sharp point sharpness.

Indications for use: h file is very similar to the tail of a mouse. When I was in school, the teacher called it a rat tail file, and the cutting ability is very strong, so it is generally used for lifting up and down.

How to use: Pull up and down to cut, as far as possible not to rotate.

Precautions for use: Because the blade is sharp, do not pull continuously in one direction, it is easy to over-cut, as soft as possible when rotating, do not violently pull when encountering resistance, do not use it for root canals with large curvature.

Problems that are easy to occur in use: due to the strong cutting ability of the h file blade, it does not rotate as much as possible when resistance is encountered, otherwise the blade is very easy to be stuck on the wall of the root canal. Design, h file does not pre-bend as much as possible, reducing the risk of breaking.

The function of the H file is the same as that of the K file, and it is also used to clean the root canal, but its cross-section is comma-shaped. You must first clarify several concepts: Root canal preparation instruments are divided into enlarged needles and root canal files. Root canal files include K files and H files. H files are used less because they are easy to break.

3.k file

K file is a kind of root canal file. The root canal file includes K file and H file. The characteristics of K file are: the cross section is square and the thread is very dense. Its function is to cooperate with the expansion needle to expand and clean the root canal. The cross section of the enlarged needle is also square, but the thread is thinner than the K file.

4. Cyclic fatigue strength of Reciprocating files and Reciprocating Blue nickel-titanium files at different ambient temperatures

The NiTi device's cyclic fatigue strength test is completed in a stainless steel artificial root canal. During the experiment, 4 different temperatures (0°C, 20°C, 35°C, and 39°C) were set using electronic and infrared controlled thermostats. 80 R25 Reciprocating Blue (VDW, Munich, Germany) and 80 R25 Reciprocating (VDW) instruments Reciprocatingate in the artificial root canal until they break, and the time and length of the broken part are recorded. The phase change temperature of each device was analyzed by differential scanning calorimetry. The data were statistically evaluated by One-way analysis of variance and Bonferroni test, and the significance level was set to 5% (P <.05). The results show that the Reciprocating Blue device has a significantly stronger cyclic fatigue strength than Reciprocating at all test temperatures (P <.05). When the ambient temperature decreases (0°C> 20°C> 35°C> 39°C), the cyclic fatigue strength increases accordingly. There was no significant difference between the lengths of the broken parts of the two devices at all test temperatures (P> .05). Conclusion: Compared with the M-Wire alloy, the Blue alloy can significantly increase the cyclic fatigue resistance of the Reciprocating file.

If you want to buy endodontic file, please contact OSAKADENTAL.