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Maggio / Giugno 97 | PROSTHESIS |
A New Thermal Treatment of precious and palladinized Alloys |
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By Rosario Muto
As well known, the fusion process of dental alloys in the laboratory consists of putting the solid metal in a furnace at controlled temperature, or using the system of crucible with oxygen and propane. The metal, made liquid that way, gets immediately put in a previously heated fireproof cylinder. On getting cold the alloy get its solid state again, reproducing the fixed shape. During the phase ransition (solid -> liquid -> solid) the metal undergoes stability variations, then the (solid) object is treated by a thermal procedure, that is said by experience to be able to guarantee stability. This procedure is generally followed with all kinds of prosthesis with noble or palladinized alloys. After the polishing treatment to make it fit the alloys for ceramics undergo a further thermal treatment to produce a chemical bond with ceramics. |
As well known, the metal treated that way provokes oxidationreduction pheno mena in the buccal cavity that weaken the harmlessness of the object. After variousresearches and experiences about the phases of metal manufacturing in 1992 I begun to stabilize alloys by the help of a gelatinoid compound I have created, which cuts down surface oxides heavily, and above all prevents them from forming again in the following bakings. | Rosario Muto was born on the 6/9/58 in Naples and got a diploma in 1979 at Istituto professionale "Casanova"in Naples He has been in charge of a dental technology laboratory since 1981. At pres- ent he works in Prato (PO) and collaborate with Odontologist Dr.Marco Cipriani. He has taken part in several advanced refresher courses as to gnathology, prosthesis implant and metallurgy. He has attended ceramics- metal master courses in Italy and abroad, cooperating with several firms about electro medical system projects and realization. |
Consequently a dark surface structure is got, which provokes negative conse- quences owing to the ceramics - metal adhesion, beside influencing the final effect of colour and its brightness. This happens with pal- ladinized alloys particularly, because they favour the creation of oxides during the repeated baking of ceramics..
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N. 1 - The gelatinoid product for alloys tratment |
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RASSEGNA ODONTOTECNICA pag. 33 |
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N. 2 - Crowns (2%Au palladinized alloys) at the and of the thermal treatment | N. 3 - Remember to apply the product also iside the crowns | N. 4 - As it can be easily noticed, cats have got a light appearance after the thermal treatment |
This
means a lower
absorption
of these substances by the
body and
therefore a lower potential chronic toxicity. The
object, moreover, shows a clearly higher aesthetic
quality if treated that way. |
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N. 5 a /5 b / 5 c - Example of mized work : postceramized welding, between ceramics-gold and richmond in resin-gold |
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N. 5 b --/> | N. 5 c --/> |
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N. 6 a / 6 b / 6c - Example of work by precision bar, junctures incluted, welding on richmond, bound to get on overdenture | N. 6 b --/> |
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N. 6 c --/> |
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N. 7a / 7 b / 7 c - Ceramics-gold structure before the thermal treatment | |
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N. 7 b --/> |
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N. 7 c --/> |
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N. 8 a / 8 b - Resin-gold work: the brightness of the metal treated by thi product is noticeable |
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N. 9 - Close-up of a ceramics group with milling: the product has been applied in order to eliminate surface oxides, and make rectifying and polishing easy --/> |
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N. 10 - The product is fit for all the metals used in the buccal cavity, therefore for stunp pins too --/> | N. 11 - After the treatment --/> |