Chemical apparatus and process disinfecting – deodorizing – preser – Process disinfecting – preserving – deodorizing – or sterilizing – Using disinfecting or sterilizing substance
Patent
1991-05-17
1993-03-02
Warden, Robert J.
Chemical apparatus and process disinfecting, deodorizing, preser
Process disinfecting, preserving, deodorizing, or sterilizing
Using disinfecting or sterilizing substance
422 36, 134 42, A61L 218
Patent
active
051907240
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to processes for disinfecting medical molding materials and molded articles made from them.
2. Statement of Related Art
In many fields of medicine, true-to-size models of organs or parts of organs have to be made on a more or less frequent basis. Thus, in pathology and in surgery, models are needed for demonstration or documentation purposes; in orthopedics, models are used for the fitting of prostheses while, in dentistry, false teeth are made from models. To make the model, a three dimensional negative of the organ in question is first prepared using molding materials and is then used as a mold for making the actual model, optionally after storage. Many materials are used to produce the negative, all of which have the property of being plastically deformable at first and then hardening after a short time to form a more or less elastic mass. Molding is carried out by pressing the organ in question into the plastic molding material and leaving it therein until the mass has hardened. The model itself is made by casting, for example by introducing mixtures of water and plaster of Paris into the negative mold.
In dentistry, there are rigid and elastic molding materials. Whereas rigid molding materials, such as plaster of Paris, zinc oxide/eugenol pastes, waxes and guttapercha are mainly used to determine the position of teeth to one another, i.e. to record bites, elastic molding materials based on synthetic or natural polymers which harden through physical or chemical crosslinking reactions are mainly used for making dental models.
At present, the most important synthetic polymers for this purpose are silicones, polyethers and polysulfides which are all chemically crosslinked. In the case of silicones, a basic distinction is drawn between condensation-crosslinking materials (these materials are hardened with organic tin or titanium compounds as catalysts which crosslink the starting polysiloxanes after the removal of terminal groups) and so-called addition-crosslinking silicone molding materials which are hardened by reaction of a vinyl-terminated polysiloxane with a polysiloxane containing SiH groups in the presence of certain platinum catalysts. In addition to polysulfides, polyether materials are also very important by virtue of their hydrophilic properties because the effective wetting, for which these properties provide, enables the tooth situation in the mouth to be particularly well reproduced, even in aqueous medium. In this case, the crosslinking reaction is based on the polymerization of epimine-terminated polyether prepolymers initiated by sulfonium salt catalysts.
The most important natural polymers are polymeric carbohydrates among which the alginates have the greatest significance. With these materials, aqueous elastic gels, which are less stable than the synthetic materials, are formed during the solidification reaction.
It is known that alginate molding materials can provide sufficiently accurate jaw impressions and are widely used because they are inexpensive to produce. This molding material is supplied to the user in the form of an alginate-containing powder which is mixed with a defined quantity of water before use. During mixing, the reactants alginic acid salt and calcium salt pass into solution, react with one another and form an insoluble, elastic hydrogel. In addition to a soluble alginic acid salt, such as potassium or sodium alginate, and a moderately soluble calcium salt, such as calcium sulfate, retarders, such as sodium phosphate or sodium pyrophosphate, fillers, such as kieselguhr, and complex transition metal fluorides, such as potassium hexafluorotitanate, are generally used. It is also of advantage to use small quantities of pyrogenic silica to obtain thixotropic behavior. To prevent dust emission from this alginate powder mixture, the mixture may be granulated by addition of soluble and insoluble organic compounds (cf. for example EP-A 0 058 203 and also DE-A 34 39 884 and DE-A 34 10 923).
The comp
REFERENCES:
patent: 3709866 (1973-01-01), Waller
patent: 3912450 (1975-10-01), Boucher
patent: 3983252 (1976-09-01), Buchalter
patent: 4836853 (1989-06-01), Gribi
Chemical Abstracts, vol. 109, Nr. 8, Aug. 22, 1988, J. Viohl et al.; "Dimensional Stability of alginate Impressions".
Seymour Block, Disinfection, Sterilization, and Preservation, 1983, pp. 67-70, 227, 484, 485.
Bansemir Klaus
Disch Karlheinz
Hachmann Klaus
Collins Laura E.
ESPE Stiftung & Co. Produktions-und Vertriebs KG
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Szoke Ernest G.
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