The metal framework should be ground

with tungsten carbide cutters or fine - grained ,

 ceramic bonded stones .

   The framework should be sandblasted with aluminium oxide .

Recommended grit sizes :

Precious metal           : 110 mμ

Non - precious metal : 250 mμ

   Oxidize the framework according to the manufacturer's instructions

 or ...

 ... or apply Blendgold .

Seal the surface of the alveolar ridge beneath the pontics

 using cyanoacrylate or lacquer and then apply

 the separating agent with a" Crea - Pen"

The opacious dentine conceals the thin marginal area of the crown

and prevents excessive shadow effect penetrating the porcelain , including the interdental spaces .Opacious dentine also vitrifies to a slightly higher degree , thus making it more homogeneous and hygienic from the periodontal point of view .This is also very significant as far as the underside of the pontic is concerned and , in addition , stabil izes the shade of the cervical third of the crown .

The labial anatomy of the crown can be built - up with dentine .

 Once the anatomical form has been contoured correctly ,

 the incisal and interdental areas of the dentine

 should be reduced to provide space for the

 following layers . Rough , irregularly shaped

 areas tend to be advantageous .

 Once the anatomical form has been contoured correctly ,

 the incisal and interdental areas of the dentine

 should be reduced to provide space for the

 following layers . Rough , irregularly shaped

 areas tend to be advantageous .

Technical tips :

・Once built - up , the porcelain must be kept moist .

   Do not allow it to dry too much !

・Should the porcelain have dried out , do NOT moisten it with mixing liquid .

   Use distilled water ONLY !

    The die should be sealed with a very thin coat of cyanoacrylate

or lacquer and separating agent applied around the shoulder with a "Creation".

     The framework , which does not fit too tightly ,

should be placed on the die . Opaque shoulder porcelain ( SP - 27 / SP - 28 / SP - 29 depending on the shade selected ) should be applied to the framework / shoulder area to stabilize the brightness value of the cervical region .

        The shoulder is then coated with the correct shade

of shoulder porcelain , which is extended to the preparation margin .

      Once the porcelain has been dried slightly with a blower

or in front of an open firing chamber ,

the framework can be released easily from the die .

      Once the shoulder porcelain has been pre - dried for 2 minutes

at 600 ° C , the first shoulder firing is carried out 

at 950 ° C , in vacuum - hold - time : 1 minute .

      Shows the shoulder after firing ( egg - shell finish ) .

     Apply a further coat of separating agent with the ”Crea - Pen” .

The firing shrinkage of the porcelain is compensated for using the correct shade of shoulder porcelain .

      After pre - drying for 2 minutes at 600 ° C ,

the second shoulder firing is carried out at 950 ° C , in vacuum - hold - time : 1 minute .

     UV view of the fired shoulder .

     OD - 43 is applied to the middle third of the crown

 to establish the brightness value .

     The full anatomical form of the crown should first be built - up

with dentine before reducing the labial , incisal , mesial and distal aspects , whereby the mamelons should remain visible in the dentine .

      Either the distal or mesial corner of the incisal edge is built - up

 first with pure enamel .

 The middle incisal area is built - up using enamel ,

opal enamel ( SI 01 - SI 04 ) , opal transparent ,

CL - O or TI porcelains alternately .

THE IRIDESCENT EFFECT

 ( " MAKE IN " ) PORCELAINS

The iridescent porcelains are soaked into the moist porcelain on the incisal area of the labial surface to  reproduce natural mamelons .

The intensity depends on the desired characteristics . MI 61 and MI 63 are usually used .

     The labial surface is completed using enamel , transparent ,

TI - Opal - Transpa and SI - Opal - Enamel porcelains , depending on the effect desired .

 The labial surface is built - up excessively to compensate for the firing shrinkage .

      Shows TI - 1 porcelain being added to the flanks of the crown

 in order to emphasize the bluish / transparent effect .

 Using "Crack liners" to simulate a crack in the enamel .

   Shows the labial surface after building - up completely .

 It can be seen clearly that the labial and incisal contours have been built - up excessively .

     PLEASE NOTE : Do not condense the porcelain at any time during building up .