Creation Willi Geller Workbook - 2

Part 2


 

BUILDING UP THE PALATAL SURFACE 

 

 

       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 .

 

 


 

               WILLI GELLER

    In Nova

 

 

       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 .

 



 

INTERPROXIMAL OPACIOUS DENTINE

 

 


 

 

      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 .



 

  INCISAL EDGE

 

 

     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 .

 


 

 FIRING

 

Firing cycle :

 

Initial temperature

 Pre - drying

 Heat rate

 Final temperature

 Hold - time

 

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 .

 



 

 THE SECOND 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 . 


 

GLAZING

 

 

 

      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 .


Herausgeber/Publisher: KLEMA Dentalprodukte Ges.m.b.H., A-6812 Meiningen, Austria

Gestaltung/Design: Graphisches Zentrum Hohenems

Ⓒ 1994 by Hämmerle Druck Quintessence, A-6845 Hohenems, Austria