gebrauchsanweisung instruction for use vintage al verblendkeramik ...

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7 Troubleshooting Troubleshooting Base Porcelain build-up Problem Opaque Liner difficult to apply Cervical porcelain difficult to apply Bubblling of Opaque Liner High firing shrinkage Cervical area raised Lingual surface cracked due to shrinkage Cause Remedy Note Too much liquid in Opaque Liner. Coping surface is too smooth. Too much liquid mixed in. Surface is too smooth. Inadequate pre-drying time. Pre-drying temperature too high. The firing tray is too hot. Coping is contaminated. Inadequate vacuum. Inadequate condensation. Cervical area condensed inadequately. Inadequate condensation. High shrinkage due to a large amount of material being applied. Mix well before use. Roughen the coping surface. (Use an abrasive such as a diamond point at low speed and water-cooled) Mix in less liquid. Roughen the coping surface. (Use an abrasive such as a diamond point at low speed and water-cooled) Increase the pre-drying time. Lower the pre-drying temperature to 500°C. After lowering the firing platform and removing the restoration, wait 2 – 3 minutes before placing a new restoration on the firing tray. Sandblast the coping with aluminum oxide to clean it. Check the vacuum. Condense Body and Enamel porcelain more. Condense cervical area more. Condense Body and Enamel porcelain more or control the shrinkage by placing a cut in the lingual surface. If only the surface layer is used without being mixed, the paste contains excessive liquid, making it difficult to apply to the base. When coping surface is smooth, paste is difficult to apply. When coping surface is smooth, paste is difficult to apply. Inadequate pre-drying causes the liquid in the Opaque Liner to be fired before being dried properly, which causes bubbles to form. If the pre-drying temperature is too high, the liquid bubbles while drying. If a coping coated with Opaque Liner is placed on a hot firing tray, the Opaque Liner liquid may boil and cause bubbles. Therefore, the coping must only be placed on a cool firing tray. Any remains of bonder from the rotary instruments left on the coping surface may cause bubbles. Sandblast with aluminum oxide (50µm, 1 – 2 bars) and clean with a steam cleaner, ultrasonic unit or distilled water. Then fire in air. Bubble incorporated during application. Compared with metal ceramic, the heat conductivity is low: the cervical area shrinks due to the firing shrinkage of the incisal porcelain. To avoid this, either condense the cervical area more with a brush or reduce the heat rate. Porcelain build-up Abrasives Glaze Shade Problem Explosive crack occurred Small cracks on the surface Bubbles form Chipped incisal edges No glaze The shade of the crown is not saturated Enamel is not transparent Cause Remedy Note Pre-drying time is too short. Pre-drying time is too long. Bubble entrapped during application Porcelain dried during application or was remixed. Heat rate is too high. Inadequate vacuum. Inappropriate speed and direction of rotation of abrasive stone. Uneven surface. Surface not cleaned thoroughly. Procera ® copings influence the shade. To prevent chipping of the incisal edge, select the correct speed and direction of rotation of the abrasive stone. Glaze after smoothen the surface with Dura-Green Fine, CeraMaster, Silicon Point. Rinse thoroughly. Adjust the coping surface with stain shade. Use Opaque Liner or Cervical. The layer of Body Apply a thicker layer. porcelain is too thin. Inadequate firing. Porcelains blended during building-up. Insufficient burnout due to inadequate drying or incorrect vacuum starting time. Increase the pre-drying time. Decrease pre-drying time. Make certain that no bubbles are entrapped while mixing the material on the palette. Do not allow the porcelain to dry during building up. Reduce the heat rate of the porcelain furnace. Check the vacuum level of your porcelain furnace. Check the firing temperature. Take care not to blend the layers while building up. Burnout properly to ensure adequate drying or delay the vacuum starting time. The drying time is an important step in the firing process. If the drying time is too short, liquid remains inside the porcelain and when inserted into the furnace the rapid increase in temperature causes the liquid to boil and explode when fired. When the pre-drying time is too long, small cracks occur on the surface from drying shrinkage. These cracks spread due to firing shrinkage and create shallow cracks on the surface. As all-ceramic crowns exhibit lower thermo conductivity than metalceramic restorations, firing commences at the surface, which tends to trap the bubbles inside. Therefore, it is extremely important to mix and build up porcelain without entrapping bubbles. Also, remixing dried porcelain easily causes bubbles to be entrapped. Glazing depends on the condition of the porcelain surface. The smoother the surface, the more stable the glaze. After rinsing apply Stain Liquid and verify the shade, then glaze. SHOFU Porcelain Stain (Shade No. 41 – 49) is recommended. Fire after body cutback, apply enamel and fire again. Porcelain contains organic pigments or is sometimes contaminated with tissue fiber while building up. These must be burned out during the pre-drying stage. If they are not burned out properly, they may cause bubbles or make the porcelain translucent. Troubleshooting 30 31
SHOFU INC. 11 Kamitakamatsu-cho, Fukuine, Higashiyama-ku, Kyoto 605 - 0983, Japan SHOFU INC. Singapore Branch, 10 Science Park Road, #03-12 The Alpha Science Park II, Singapore 117684 SHOFU INC. Shanghai Rep. Office, No. 645 Jiye Road, She Shan Industry Park Songjiang 201602, Shanghai, China SHOFU DENTAL CORPORATION 1225 Stone Drive, San Marcos, CA 92078-4059, USA SHOFU DENTAL PRODUCTS LTD. Dukes Factory, Chiddingstone Causeway, Tonbridge, Kent, TN11 8JU, UK SHOFU DENTAL GmbH Am Brüll 17, 40878 Ratingen, Germany, EU REPRESENTATIVE 259999 · 08/2005
Seite 1 und 2: VINTAGE AL VERBLENDKERAMIK SYSTEM G
Seite 3 und 4: 2-3. System und Farben 2-4. Kompone
Seite 6 und 7: VINTAGE AL Margin Porcelain Set 13
Seite 8 und 9: 4 Anwendung 4-1. VINTAGE AL Farbtab
Seite 10 und 11: Schichtaufbau ohne Opaque Liner (1)
Seite 12 und 13: 5 Besondere Anwendungshinweise für
Seite 14 und 15: 5-2. Cervical Trans (Transluzente Z
Seite 16 und 17: 7 Troubleshooting Troubleshooting 3
Seite 18 und 19: 1 Notes Notes Use of eye-protective
Seite 20 und 21: 2-4. Components 2-4. Components Opa
Seite 22 und 23: VINTAGE AL Margin Porcelain Set 13
Seite 24 und 25: 4 Application 4-1. VINTAGE AL Shade
Seite 26 und 27: Where no Opaque Liner is used (1) F
Seite 28 und 29: 5 Technical advice for the various
Seite 30 und 31: 5-2. Cervical Trans 5-3. VINTAGE AL

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