Dental Code For Root Canal

k-file and h-file

Welcome to Easy Dentistry! Today, we are going to discuss a topic that is often confusing for beginners: the color coding and numbering of k-file and h-file instruments in root canal treatment (RCT). If you are new to dentistry or have ever been unsure about these instruments, this article is for you!

Dental Code For Root Canal
Dental Code For Root Canal

Understanding the Color Coding

Let’s start by understanding the color coding of the files. The k-files are arranged in the first row and the h-files are arranged in the second row. You may have noticed that the files are color-coded. In the first row, you will find files in the following colors: white, yellow, red, blue, green, and black. The sequence of colors repeats after black. The numbers written on the back of the files correspond to their sizes. For example, the first file in the row may be number 15, followed by number 20, 25, and so on. This pattern continues until number 60, after which the files increase in size by a margin of 10.

Differentiating between k-files and h-files

Now, let’s understand how to differentiate between k-files and h-files. The k-files have multiple flutes, which are spiral patterns that resemble a screw. These flutes are closely arranged and help in cleaning and shaping the root canal. On the other hand, the h-files have a cutting edge that resembles a Christmas tree. The cutting mechanism of h-files occurs when they are pulled out of the canal.

The Benefits of Color Coding

Color coding the files makes it easier to identify and differentiate between them. By memorizing the color coding system, you won’t have to constantly refer to the numbers on the back of the files. To remember the color coding, you can create a mnemonic device using the first letters of the colors. For example, you can use the phrase “WYR B GB Bro”.

Remember, if you find it difficult to remember the color coding in the beginning, don’t worry! The numbers are always written on the back of the files for reference.


In this article, we have discussed the color coding and numbering system of k-file and h-file instruments in root canal treatment. Understanding the color coding can help dental professionals effectively use these instruments during RCT procedures. We hope this article has clarified any confusion and provided you with valuable information. Stay tuned for our next video, where we will delve deeper into the basics of RCT for beginners.

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