One of Sendoline's most important product innovations is the H-folder, which was developed in the 1940s in collaboration with Swedish physician Gustav Hedström. The launch of the H-file with the improvement of its cutting capacity introduces a new and more effective way for dentists to work. The H-file is still one of the most used files in the world today.

In 1980, the S-File® was introduced. The cylindrical basic design of the S-File® provides good flexibility and excellent debris transport. In addition, double cutting edges provide even greater cutting capacity than the traditional H- or K-files.

The S-File® is simplistically described as a dual H-file, and is yet another example of how Sendoline may have contributed to improvements in the endontic domain.

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