PORCELAIN APPLICATION METHODS.
OPAQUE PORCELIAN APPLICATION. www.indiandentalacademy.com
GLASS ROD TECHNIQUE •
First, lightly wet the oxidized metal metal substructure to be veneered with distilled water and gently vibrate the casting for thorough wetting.
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• Use point end of glass rod to apply the opaque porcelain.begin the opaquing most convex portion of the metal.
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• Move the opaque towards the porcelain metal junction from one inter proximal area to to other & cover the incisal area.
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• Lightly tap the hemostat with metal instrument to condense the opaque porcelain and excess opaquing liquid will raise to the surface.
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• Place the edge of tissue,against the an edge of the moist opaque porcelain.hold the tissue in place until the liquid is absorbed and takes on a dull appearance. www.indiandentalacademy.com
• Blend the opaque at the porcelain metal junction to establish a gradual transition from opaque to external surface.
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BRUSH TECHNIQUE
• Opaque can also be applied with the brush.load the brush tip with opaque porcelain and carry it to the coping.
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• Application of the opaque twice is also recommended.initially thin layer of the opaque and complete masking is followed.
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DENTIN APPLICATION METHOD.
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• Carefully return the cleaned,opaqued coping to the master cast.place folded tissue or bottling paper on the lingual side of the restoration.
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• To minimize the potential for entrapping air in the porcelain, move the tip of the pointed brush through the mixed dentin porcelain.remove the brush with dentin porcelain captured on the brush tip. www.indiandentalacademy.com
• Apply the porcelain to the most convex area on the restoration.
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• Gently push the porcelain to the intrproximal,incisal areas.
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• Move the porcelain down to the incisal edge and lightly blot the build up to condense the porcelain on the substructure.
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• To create the mesialfacial line angle,wipe the brush to dry it slightly and reduce the pointing then lightly move from the mesial gingival area to mesial-incisal area. www.indiandentalacademy.com
• Point the brush and add additional dentin porcelain to lingual aspect of the incisal edge.smooth and condense the incisal edge from the lingual and facial aspects. www.indiandentalacademy.com
• Use a razor knife to cut back the incisal edge from between 1.0to1.5mm
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• Remove dentin porcelain at the mesial inter proximal line angle.extend the cut to the junction of the middle and gingival 1/3rd for younger patients. www.indiandentalacademy.com
• At the distal intrproximal line angle,make a cut form the incisal edge towards the gingival 1/3rd as far as required for the esthetics.
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• Examine the restoration from an incisal view for symmetry and adequacy of the cut back.
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ENAMEL APPLIACTION METHODS.
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• With pointed brush,apply enamel porcelain to one corner of cutback.
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• Add more enamel porcelain and move it across the facial surface in the incisal one third.
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• Blend the enamel porcelain at the junction of middle and gingival 1/3rd &begin to establish the incisal edge & condense the porcelain by blotting periodically. www.indiandentalacademy.com
• Blend the enamel porcelain into gingival 1/3rd on the facial surface.Recreate the interproximal contours and line angles.
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• Shape the mesialincisal corner as required for each case.examine the build up form incisal view&evaluate the overall shape .
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ALTERNATIVE BUILD UP TECHNIQUE.
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• Apply the opaque to mask the underlying metal.
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• Complete & smooth the dentin buildup.
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• Create three developmental lobes with the pointed brush.
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• Invert the cast & place translucent porcelain in the two developmental groove.apply enamel porcelain to the inter proximal areas.
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• Continue this process until the entire crown is built to full contour.
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• Finally, use the whipping brush to gently smooth the entire porcelain build up.
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• Once the porcelain has been fired,you should be able to observe demonstrable mamelons in the restoration.
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PORCELAIN APLICATION FOR FIXED PARTIAL DENTURE.
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• Apply and condense opaque porcelain.Cover any gray areas,and fire the prosthesis.
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• Return the opaqued FPD to the master cast with a piece of tissue paper cut to cover the entire pontic area.
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• Add a small portion of dentin porcelain to the under side of the pontic on the FPD frame work.
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• Return the frame work to the master cast and gently rock it back and forth until it seats completely.Remove the frame work and inspect the tissue side of the pontic.this area should cover completely with porcelain and well condensed. www.indiandentalacademy.com
• Place the frame work back on the master cast and apply dentin porcelain or add and condense opacous dentin to the cervical areas of the three components. www.indiandentalacademy.com
• Complete the dentin build up.
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• Create the developmental lobes.Use thin razor knife to cut through inter proximal areas and individualize the teeth.
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• Add enamel veneering material.
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• Condense the porcelain build up.
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• Measure the mesialdistal width of each tooth with a Boley gauge.compare that measurement with porcelain build up.
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• Use a knife or other instrument to make any necessary adjustments in the mesial-distal width.
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• Facial view of the build up.
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• Lingual view of the build up.
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• Three unit FPD after firing.
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FIRING PROCEDURES. • The large bulk of the build up will require more time to dry and pre heat than the opaque porcelain. • Put the restoration on saggar tray place it on the muffle stand of the furnace. • Properly matured porcelain have a slightly orange peel appearance when fired correctly. • Do not under fire the porcelain.porcelain that has not matured properly has no shine to the surface & internally has cloudy appearance. www.indiandentalacademy.com
• Restorations that are under fired porcelain often have to be stripped form metal and rebuilt. • Over fired porcelains appears to be glazed and the surface has little or none of the pebbly appearance. • The firing temperature is usually lowered 10 degrees with each correction firing, so that initial build up dos not get effected. www.indiandentalacademy.com
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