FR2604620A1 - Device for preparing and preserving homogenous ceramic powder and distilled water mixtures for dental use - Google Patents

Abstract

Device for preparing and preserving homogenous ceramic powder and distilled water mixtures for dental use. It consists of an earthenware pallet 1 of parallelepipedal shape in which dishes 2 are modelled from porous earthenware used for preparing the mixtures, and which are separated from each other by rims or surfaces 3 of enamelled earthenware. The pallet rests on a synthetic sponge 4 placed in a case 5 with a touching lid 6 of transparent plastic containing distilled water 7. The device is in particular intended for the preservation of mixtures with a view to making so-called "ceramometallic" dental prostheses.

Description

 The present invention relates to a device for preparing homogeneous mixtures of ceramic powder and distilled water for dental use, either for immediate use, or for keeping them in a state of constant humidification with a view to their reuse.

These mixtures are applied with a spatula or a brush on metal frames. The whole after baking in the oven makes it possible to obtain dental prostheses called "Ceramic-metallic". Traditionally the ceramic technician for each dental prosthesis to be performed and each shade required kneaded a certain amount of ceramic powder and distilled water
Until a paste with the desired consistency is obtained.

 Any mixture that is not used quickly enough will dehumidify and harden. The possibility of reuse of this residual mixture before complete drying is technically not recommended. It requires a new supply of ceramic powder, distilled water and a remixing of the whole which, although carried out under the best conditions and over a prolonged period, invariably results in the formation of air bubbles. The new mixture obtained has neither the primary homogeneity, nor the shade absolutely identical to that of origin.

 To overcome these drawbacks, it is essential to prepare quantities of mixtures greater than the actual requirements for each desired shade.

 In all cases, this results in manufacturing waste.

 The device according to the invention consists of a parallelepipedal pallet (1), comprising on its external face earthenware cups (2), with a thickness of the order of 5 to 6 mm, with a degree of porosity d '' about 0.8 and used for the preparation of mixtures.

The underside of the pallet (1) rests on a synthetic sponge (4). The pallet (1,2,3) and sponge (4) assembly is placed in a case (5) with cover (ó) made of transparent plastic material containing distilled water (7).

 The bolt bowl (5) protects the pallet (1) during its use and allows visual monitoring of the distilled water level (7), its adjoining cover (6) aims to reduce evaporation and pollution.

The small thickness of the sponge (4) of approximately 8 to 10 mm, and its alveolar structure facilitate very rapid imbibition by capillarity. Its power to absorb distilled water corresponding to 7 or 8 times its own weight, leads to an increase in its volume, ensures perfect contact at the level of the underside of the cups (2) and the permanence of the process. humidification of the mixtures across the entire surface of the porous earthenware whatever the level of distilled water (7) actually existing in the bowl (5).

 The synthetic sponge also operates a filtration of water and the retention of certain impurities which are removed after each of the periodic washes.

 The bowl (5) containing a maximum level of distilled water (7) it is possible, without new additive and after fitting the cover (6) to keep the mixtures in a humidified state for reuse during a duration of the order of 15 days and more.

 The distilled water (7) used does not modify, either by addition or by chemical reaction, the components of the ceramic powder as they result from research by the manufacturer. It limits the salt deposits, most of calcareous origin, thus facilitates the maintenance of the porosity of the earthenware of the cups (2) and prolongs the duration of use of the pallet (1).

 The production of certain ceramic prostheses requires having mixtures offering a more complete range of colors. The device can therefore include a larger number of cups (2) of different surfaces and profiles.

 Compared to the traditional method, the use of the device has many advantages. It limits manufacturing waste to the strict minimum and reduces the execution times of metal-ceramic prostheses.

 Prior to the production of each prosthesis, there is no longer any need to prepare new mixtures, those of origin being always available and ready to be used immediately without additives and as frequently as possible until complete use.

 The use of the device allows a more flexible planning of the tasks of the ceramist technician who is no longer forced after the preparation of the different mixtures to proceed to their application in short time on the metal frames.

 It facilitates totlte interverltion "a postcrini-i 'more particularly finishing and retouching, these operations no longer showing any trace, the mixtures always retaining their original homogeneity and a shade identical to that of origin.

 These various advantages contribute to the permanence of the quality of the ceramic and the duration of the finished products.

The accompanying drawings illustrate the invention
FIG. 1 represents the plan view of the device,
- Figure 2 shows the longitudinal section of the device.

 The device represented in FIG. 1 comprises a palette (1) of earthenware, four cups (2) of rectangular shape made of porous earthenware, delimited by edges (3) of enameled earthenware, a synthetic sponge (4) represented by a dotted line and the base of the boot (5) protecting the assembly.

 Figure 2 shows n longitudinal section of the various elements of the earthenware palette (1,2,3), the synthetic sponge (4), the housing (5), its cover (6) in transparent plastic and the level d distilled water (7).

 The device according to the invention is particularly intended for the conservation in a constant humidification state of homogeneous mixtures of ceramic powder and distilled water for the preparation of dental prostheses called "ceramic-metallic".

Claims (5)

 1. Device for preparing homogeneous mixtures of ceramic powder and distilled water with dental risas, either for immediate use or for preservation in a state of permanent humidification, characterized in that it comprises a palette (1 ) in earthenware of parallelepiped shape having on its external face cups (2) in porous earthenware intended for the elaboration of mixtures separated between them by edges or surfaces (3) of enamelled earthenware and resting on their lower faces on a sponge synthetic (4), the pallet assembly (1,2,3), synthetic sponge (4) being placed in a case (5) with attached cover (6) containing distilled water (7).  2. Device according to claim 1, characterized in that the synthetic sponge (4) by its appropriate cellular structure and its small thickness s quickly soaks by capillary action, that its absorption power between 8 and 9 ensures a perfect contact with the level of the inferent fa cs of the porous latency cups which are permanently humidified on any surface and whatever the level of water actually existing in the box.  3. Device according to claims I and 2, characterized in that the earthenware of the cups (2) has a degree of porosity of the order of about 0.8, ensuring regular distribution of distilled water and maintaining the process permanent humidification of mixtures with an average duration of 15 days.  4. Device according to any one of claims 1 to 3, characterized in that the shoemaker (5) and its convercle (6) are made of transparent plastic.  5. Device according to any one of the preceding claims, characterized in that it has a minimum of four cups (2) and up to sixteen cups (2) of variable geometric surfaces and shapes.