opmaak manual supranium nieuw.indd
Contents
1. in one direction only Use dust collector Do not apply a rubber polishing material to the surface to be veneered Avoid sharp edges and receding areas With plastic veneering Attach retentions or use silanizing process and finish in the usual way Veneer according to manufacturer s instructions 90 125 pm Use a steam jet or clean with hot distilled water Oxidize the cleaned sub structure for one to two minutes in the porcelain furnace at 900 C 1 652 F The colour of the oxide layer should be uni form Sandblast the sub structure with aluminium oxide 90 125 pm Use a stem jet or heated distilled water 12 Working the body porcelain Supranium is suitable for firing normal expanding ceramic For instance Antagon Interaction Apply and fire the ceramic according the ceramic manufacturer s user instructions Step 1 e Oxidize in accordance with step 11 Step 2 e Apply a total masking layer of Vi Comp NE bonder art nr 005010058 a mix Vi Comp NE bonder with Ducera B Liquid art nr 05368271514 to a creamy substance b apply the Vi Comp NE bonder in a fully masking layer c follow the firing procedure below Starting temp Dry Vacuum starting temp 400 C 4 minutes 400 C Rate of heat increase Final temp Hold time 60 C min 980 C 2 minutes 1 min with vacuum and 1 min without vacuum Step 3 After this bonder firing procedure continue with the Antagon Interaction user manual at item2. number 2b Opaque firing All firing processes need to be cooled quickly to normal O 2 minutes Do not overheat the alloy This could lead to air bubbles in the fired ceramic layer Overheating can be recog nized by an uneven oxide layer colour or by a rough metal surface 13 Soldering For soldering SUPRANIUM we recommend a mixture of oxygen and propane or butane or natural gas a Prior to firing SUPRANIUM sub structures can be soldered with DENTI LOT and its own special purpose flux The solde ring gap must not be wider than 0 2 mm The surface to be soldered must be of adequate size and be polis hed to a metallic lustre Keep the soldering block as small as possible Heat the soldering block to 500 C 932 F in the preheating furnace As SUPRANIUM s thermal conductivity is low and this entails a risk of the surface overheating while the working temperature of the solder has not yet been reached on the inside of the part to be soldered a low torchflame setting is necessary Heat up the solder and immerse it in the flux Slowly heat the part to be soldered until red hot Apply the flux laden solder to the soldering point so that the flux can flow into the soldering gap Continue to heat up the part until white hot Hold the soldering tip to the heated soldering point and allow the DENTI LOT to flow into the soldering gap Allow to cool in air and blast clean b After firing furnace soldering Embed part to be so
3. User instructions Nickel based dental metal ceramic alloy Beryllium and gallium free ISO 22674 ISO 9693 Elephant Dental B V 0344 A Ni Made in Germany Verlengde Lageweg 10 1628 PM Hoorn The Netherlands Tel 31 229 25 90 00 Fax 31 229 25 90 99 E mail info elephant nl www elephant dental com Chemical composition in Physical and alloy properties mass percentage target values Ni 61 0 Type IV extra hard Density 8 4 g cm Cr 21 5 Colour Grey Melting Range 1 300 1 360 C Mo 9 0 Vickers hardness 220 HV10 2 372 2 480 F Nb 4 0 Modulus of elasticity 200 GPa Casting temperature 1 545 C 2 813 F Co 2 0 Yield strength 400 MPa Rp 0 2 CTE 25 500 C 13 9 pm m K Fe 1 5 Tensile strength 710 MPa Si Mn lt 1 0 Elongation 30 after firing Indication 11 Preparation and oxidation of the Nickel based dental alloy for fixed metal to ceramic den sub structure tal restorations such as crowns bridges etc Sandblast the sub structure with aluminium oxide Contra indication Supranium contains nickel it should not be used by or for people with a known nickel allergy or with an allergy or sensitivity to one of the other components Adverse effects Certain components of the alloy may cause an allergic reaction or sick feeling due to electro chemical reactions Nickel is classified as a suspect carcinogen R40 For processing precautions see MSDS Interactions In ex
4. ble do not gold plate SUPRANIUM The chemical composition of various goldplating materials offers no guarantee for sufficient corrosion resistance local corrosion of the goldplating layer may later lead to cracks and spalling b For porcelain removal SUPRANIUM sub structures should not remain in the hydrogen fluoride bath for longer than two hours c See www elephantdental com for material safety data sheets MSDS
5. eptional cases occlusal or approximal contact with different alloys may cause a sick feeling due to electro chemical processes or a slight sensation of electrical pulses due to the difference in electric potential Processing instructions 1 Waxing up To ensure problem free casting of the sub structure do not model crown walls thinner than 0 4 0 5 mm to ensure that wall thickness after finishing is at least 0 25 mm Form crowns and pontics in line with anatomical tooth shapes to permit uniform ceramic coating incisal max 2 mm occlusal max 1 5 mm Avoid sharp edges and receding areas in the pattern the transition from metal to ceramic should be smooth The lingual metal end should be located below the incisal zone to avoid spalling caused by unwanted pressure tensile stresses 2 Spruing Direct method Crowns and pontics must be provided with a sprue of 3 mm diameter use sprues with reser voir diameter 5 6 or 7 mm for full cast crowns and pontics to avoid shrinkage cavities during solidification Distance between reservoir and cast 1 to 2 mm Indirect method For casting with transverse sprue the following dimensions apply sprues to pattern diam 3 mm transverse sprue diam 5 mm feed channels to the transverse sprue diam 5 mm Distance from transverse sprue to cast 1 to 2 mm Indirect method for pontics and full cast crowns particu larly short distance from sprue button to cast Arrange sprues accordin
6. g to the direction of metal flow Attach wax marking pin to indicate the position of the cast on the base of the casting ring Sprues should be as short as possible Do not place the object to be cast in the hottest point in the casting ring 3 Stress relieving the pattern Use stress relieving agent indicated by the manufacturer 4 Investing A fine grained phosphate bonded graphite and gypsumree investment for crown and bridge work is ideally suited to producing accurately fitting casts We recommend Carrara Universal Dustless Cat no 232976050 5 Preheating Follow the instructions from the investment manufacturer For Carrara Universal Dustless we recommend bench setting the moulds for one hour Place the moulds in a cold furnace and heat them to 982 C 1800 F Hold for one hour 6 Required metal quantities The number of SUPRANIUM ingots required for a specific casting operation is determined by multiplying the weight of the wax pattern g including sprues by the density of SUPRANIUM 8 4 g cm A SUPRANIUM ingot weights 6 g 7 Insert the casting ring Insert the heated casting ring in the centrifugal casting arm of the casting machine such that the marking point is pointing in the opposite direction of the rotational direc tion of the casting arm 8 Casting a With motorized centrifugal caster for open flame melting and casting Ignite oxy acetylene or oxy propane mixture Fully open both valves a
7. ldered at an incline Keep the solde ring block as small as possible Ensure that no soldering investment comes into contact with the porcelain Paint separator onto the porcelain around the soldering gap to avoid discoloration Good results are obtained with low melting white gold alloy solders Apply a thin layer of flux to the soldering point which must have a sufficiently large surface area and be polished to a metallic lustre Ensure that the flux does not come into contact with the porcelain Place solder onto soldering point and pre heat for about 15 minutes in the preheating furnace at 500 C 932 F Remove the soldering block from pre heating furnace and insert in porcelain furnace Set the porcelain furnace at 70 C 158 F above the working temperature of the solder used Maintain the soldering temperature for 2 to 3 minutes without vacuum After the soldered part has cooled down carefully remove from the soldering investment and finish 14 Re use For ceramic veneering it is recommended that only new material is used as any impurities might impair the ceramic bond For plastic veneering and non veneered crowns however SUPRANIUM sprue cones can be used provided that oxides and residual investment com pound have been completely removed SUPRANIUM can be re used 3 to 4 tmes provided a mixture ratio by weight of 1 3 max 1 SUPRANIUM ingots SUPRANIUM sprue cone is observed Important notes a If possi
8. nd adjust the flame by reducing the flow of acytelene or propane until approx 3 mm long blue cones become visible at the multiple orifice tip Pressure values acetylene 0 7 bar oxygen 1 9 bar or pro pane 0 3 bar oxygen 1 5 bar This gives a neutral flame which is essential for melting SUPRANIUM Place SUPRANIUM ingots in the preheated crucible Keeping the torch about 40 mm above the top of the crucible and rotating the tip heat the ingots evenly until they form a molten bath Initiate centrifugal action immedia tely after molten bath has formed b With atmospheric high frequency melting and centrifugal casting unit Do not use graphite crucibles Initiate centrifugal action as soon as the ingots have melted and the shadow has disappeared c With vacuum high frequency melting and centrifugal unit This type of unit can be used for melting and casting SUPRANIUM under vacuum conditions Initiate the centrifugal action as soon as the ingots have melted and the shadow has disappeared 9 Removal After casting allow the casting ring to cool down in air Carefully remove the cast from the casting ring Carefully remove residual investment compound Clean the cast by blasting with aluminium oxide abrasive 90 125 pm Do not blast crown margins directly 10 Finishing Finish SPRANIUM sub structures with sharped edged hard metal cutters and ceramic bonded grinding stones without applying too much pressure Grind
Download Pdf Manuals
Related Search