In our article What are the requirements for a dental brush?, we examined the important attributes of a brush for dental technicians. In this blogpost, we will show you how we used these results for the development of the Renfert lay:art style dental brush. The key factors for a dental brush are its hairs and the production of the brush tip.

Hairs, a distinctive feature

It is not without reason that the Aquarell brushes made from Kolinksy hair proved to be the most suitable. The load-bearing capacity of this hair sets it far apart from all other types. However, there are also great differences in quality in this area. “Kolinsky hair” is not a protected name and anyone can use it, even with “poor quality” hair.
Pre-treatment of the hair is also part of the quality criteria, as depending on the amount of care taken the brush hair has better or poorer properties.

Solution:
We require the best quality hair for our needs. In this case it is actually true that the most expensive is also the best. The price results from the difficult and exclusive selection procedure, the manufacturing process, the complex preparation and refinement of the raw hair.

Brush tip lay:art style

Brush tip lay:art style

The hairs of the lay:art style are:

  • tail hairs of a male Kolinsky marten, which generally have the longest and finest tips with the highest tension force
  • from the winter fur of an older male animal (approx. 3 – 5 years)
  • from animals from particularly cold regions (border region of Siberia and China), whose hairs are very resistant due to the weather conditions – from a certain, less mechanically stressed area of the tail

Refinement of the hairs
The natural oil content prevents water absorption, too little oil reduces the tension force. I developed a procedure with which it is possible to set the oil content of the hair precisely; high enough, so that the water uptake function is correct and the tension force only reduces slightly.

Manufacture
The professions of hair finishers and brush makers rely greatly on their tradition. With this classic design the hairs are arranged similar to a pyramid, i.e. the longest hairs are in the tip and the hair becomes ever shorter towards the outside.
This procedure is perfectly designed for the classic use of the brush. The color can be extracted better from the brush in this case. In contrast the dental brush is moved against the direction of the hair in dental technology.

Disadvantage for dental technicians
If the tip includes very fine hairs, it is too fine and produces only very low stiffness and tension force. With very strong hairs the resistance, which the individual hair must withstand when loaded, is very high and it breaks easily (reduced  service life).
When taking up porcelain very many hairs are subjected to high loading (reduced service life).

 

Solution:
I developed a procedure that enabled the individual hairs to be selected according to their quality and appearance and be specifically placed on the required location on the dental brush. The very fine tapered hairs have a high quality with regard to elasticity and service life.

In addition, I have redesigned the tip formation bundling the number of very fine hairs in the tip to a high network of hair with unsurpassed stiffness. The load on the individual hairs has been reduced due to the same lengths of hair and the applied forces are deflected to the side.

Apart from its special attributes, both design and ergonomics were of great importance for us, when we developed de lay:art style dental brush.
Find out more at www.lay-art.de

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Cim Özyurt is dental technician and Product Manager at Renfert GmbH. Part of his field of work is the product range brushes & mixing trays where he is ...

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