DE3013848A1 - Dentistry grinding disc or tip prodn. - by cold-mixing pref. unsatd. polyester binder and abrasive, forming and hardening - Google Patents

Abstract

Prodn. of grinding, - cutting, separating and polishing discs or tips comprises cold-mixing a binder and an abrasive, forming and hardening. Pref binders are polyesters, esp. unsaturated polyesters. The discs or tips are used esp. in dentistry, e.g. for working prostheses. The compsns. can be cold-hardened. Polyester binders are easily handled, cold-formed, cheap and cause no smell on laboratory working.

Description

Process for the production of grinding, cutting, separating

and polishing discs, tips or the like.

The invention relates to a method for producing grinding, Separating, separating and polishing disks, tips or the like, in particular for medical applications Purposes, from abrasives provided with a binder.

Discs or tips of this type are mainly used in dental applications Practices or laboratories related and are used to process prostheses or the like. They are exposed to considerable stress during their use and must therefore have special chemical, physical and mechanical properties.

So far, they have usually been made from phenolic resins or Rubber coated or mixed with abrasives such as B. corundum, the Mass is subjected to a certain heat treatment.

Coated diamond disks are also known, but they are very expensive and are therefore only used for certain work.

On the one hand, these known discs or tips have the disadvantage that their production takes a relatively long time due to the heat treatment, since the hardening must be awaited before the pane can be treated further can. Furthermore, they produce an odor nuisance during the processing process in the laboratories, which appear to be unfavorable to use for reasons of workplace hygiene leaves.

In practice it has also been shown that the so produced In many cases, disks do not meet the mechanical requirements placed on them satisfy.

The inventor has set himself the goal of developing a process by which the aforementioned disadvantages avoided and discs or tips before all are inexpensive to manufacture.

This object is achieved in that the binder together with cold mixed with the abrasive, shaped and hardened.

Polyester is the most suitable binder for this process or polyester resins. These have the advantage that they are easy to handle when cold deform and are very inexpensive.

The invention also includes the use of unsaturated polyester resins, which can be used primarily as casting resins.

The polyesters also have the considerable advantage that they hardly have any offensive odors act and thus disrupt laboratory operations little.

This binder is usually an accelerator or hardener added to shorten the curing period. For this comes z. B. the under accelerator known from the industry name BP 50 in question. This too becomes the binder added cold.

Particularly beneficial as abrasives for this process have Aluminum oxide or high-grade corundum and silicon carbide have been proven. They prove it in practice Very good mechanical properties in connection with the polyester.

However, the concept of the invention also includes the addition of further in abrasives commonly used in dental technology.

It goes without saying that the hardening process can also be carried out by adding heat to accelerate, however, a cold hardening is sufficient according to the present method.

Claims (6)

PATENT CLAIMS I Q) i. Process for the production of grinding, cutting, Separating and polishing disks, tips or the like, in particular for medical purposes, of abrasives provided with a binding agent, characterized in that the binder and the abrasive are mixed cold, shaped and hardened will. 2. The method according to claim 1, characterized in that as a binder a polyester or polyester resin is used. 3. The method according to claim 2, characterized in that as a binder an unsaturated polyester resin is used. 4. The method according to any one of claims 1 to 3, characterized in that that the binding agent contains an accelerator or Hardener is added. 5. The method according to at least one of claims 1 to 4, characterized characterized in that the binder and / or hardener aluminum oxide (A1203> than Abrasive is added. 6. The method according to at least one of claims 1 to 4, characterized characterized in that the binder and / or hardener silicon carbide as an abrasive is admitted.