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community & competence The International Journal of Dental Technology

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(Giro)form Perfect in Form Model Management in the Lab: An efficient Model System by AmannGirrbach – Part 1 A contribution by dental master technician ZTM Stefan Schunke, Fürth/Germany

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Model Management in the Lab: An efficient Model System by AmannGirrbach – Part 1

(Giro)form Perfect in Form
A contribution by dental master technician ZTM Stefan Schunke, Fürth/Germany Don’t worry. Stefan Schunke is not going to bore you with grey theories on proper laboratory management in this series of articles. The experiencedpractitioner’s objective is to demonstrate the correct management of processes in the laboratory by means of a proper system. In this context, he would like to refer to the etymological origin of the term “management”, whose potential source may be taken from the Latin “manus agree”, i.e. leading by the hand. This is the moment to lean back and be guided through the topics Model (Part 1), Framework (Part 2)and Articulator Management (Part 3).

Introduction In our everyday routine, we are confronted with working instructions and, of course, models. And does the willing reader of this article not know the phenomenon of a customer saying something such as “look at the models and you know how the lab is working” or colleagues confronting you with the statement that “the models are the business cardsof the laboratory”? This may sound like nonsense to some people. Is it really? Just take a look at the figures 1 - 3. I will comment on these figures individually. Figure 1 shows the classical “saw-cut model”. A dowel pin in the original sense was used to remove the model die. This is a pin that at the end of its retentive part takes the shape of a thin mandrel and may be directly put in theimpression material. If several of these pins have to be used for one die, there may be the danger, due to divergences, that the die may no longer be removed or wider saw cuts are necessary. Of course such a pin does not guide properly and the die wobbles. Then the impression is only partially cast using the “oh so expensive” class IV plaster in or-

der to save “costs”. Finally, the remainder of theimpression is cast with a class 2 plaster and then based, however, without removing the class IV segment and without using a separating agent. Those who look properly will recognize the pin in the centre of the preparation margin. Is such a model reliable? I received this model at the beginning of the 90s. Figure 2 shows a further disaster model. This is a model upon which the finished unit washanded in. The colleague proudly told to me that “money played no part with this patient and everything was paid”. What do you think? Is this a “reliable” model? The photo of this model was taken at the end of the 90s. A model of the year 2009 is displayed in figure 3. This model was to provide the basis for a removable unit… If this were your personal model situation, would you trust the restorationconstructed upon it? In as far as these parameters described at the beginning are concerned the comments made on behalf of the dentists and colleagues are more than appropriate. Models have to be considered and treated like the documents of a public notary. Only on the basis of intact documents, here models, may we document or prove processes, plans,

preparations and so forth. This is equallytrue in the legal sense. The author of this article is of the opinion that prosthetic dentistry requires precision saw-cut models. The production requires some effort and this is also documented in the costs for the patient. However, what happens if the work has to be repeated because of the model? This is why the author thinks Model Management should be taken on by responsible hands. In...