As the palatal surface is still exposed ,

the relationship of the labial surface to the framework can be checked at any time .

     The palatal surface is usually built - up with a layer of darker OD

( such as OD - 41 ) or an OD mixture modified with "In Nova" , which decreases in thickness toward the incisal edge .

     The area around the tubercle and the bases of the marginal ridges

 are built - up with dentine .

       A mixture of dentine and "In Nova "( Universal modifier ) porcelains 

can be used to reproduce dark , discoloured areas in the palatal fossa .

     The palatal surface is then completed with enamel ,

 transparent and cervical transparent porcelains .

      A triangular area is removed from the cervical interdental area ,

 filled with opacious dentine ( preferably OD - 32 ) and then covered with the desired shade of dentine . This provides for increased light and shade stability .

　　　　　The incisal edge is built - up with a mixture of enamel and dentine .

　　　　　Shows the crown after building - up completely .

　　　　　Shows the restoration being dried .

580 ° C

 at least 6 min .

 55 ° C / min .

 920 ° C , in vacuum

 1 minute , in air

 　　　　　Shows the slight surface luster after the first dentine firing .

　　　 Assuming that the shade does not require adjusting ,

the contours should be re - built with the following porcelains : 

 - Shoulder area -

   1/3 shoulder porcelain ,

　2/3 cervical transparent porcelain ,

 - body and incisal areas -  CL - O .

The second dentine firing is carried out as follows :

Pre - drying : 4 minutes at 580 ° C , firing : 910 ° C , in vacuum - hold - time : 1 minute . 

Shows the correct surface finish after the second dentine firing . 

      Discoloured zones on the tooth surface can be reproduced naturally

with " Make - Up " porcelains ( stain and glaze effect ) .

 Pre - drying : 2 minutes at 600 ° C .

 Glazing is carried out at 930 ° C , IN AIR and with no hold - time .

     After glazing in the furnace , the surface of the crown is finished

 using mechanical means .

     The glaze and surface texture of the restoration can be matched

to the conditions in the mouth using rubber

 polishers , sandpaper , felt wheels , pumice and Sidol .