The metal framework should be ground

with tungsten carbide cutters or fine - grained ,

 ceramic bonded stones ensuring that the rotary

 instrument is always moved in the same

 direction . Make quite certain that no parts of

 the metal become overlapped during trimming .

The framework should be sandblasted with aluminium oxide

( precious metal - 110 my , non - precious metal -

 250 my , at a pressure of 2-3 bars ) and then

 steam - cleaned or cleaned and degreased .

Oxidize the framework according to the manufacturer's instructions .

 Ensure that the oxide layer is uniform .

  Use the ”Creapast” Brush to apply the ”Creapust"

to the metal framework, ensuring that the

brushstrokes are even and that the metal is

masked by approximately 75%. Make certain

that the brush is only very slightly moist.

  The first firing is carried out at 980 °C (non-precious alloys: 1000 °C),

in vacuum. Once the final temperature

has been attained, the firing chamber is vented.

Hold-time: 1 minute.

It is absolutely essential to pre-dry the

framework for 6 minutes at 550 °C.

  After firing, the opaquer should have a slight sheen.

The second coating of opaquer should mask the metal completely .

 If necessary , the opaquer shade can be adjusted

 slightly with special opaquer modifiers .

 ( Opaquer powder from the "Creation"

 Assortment may also be used for the second

 opaquer coating ) .

  The second opaquer firing is carried out at 950 ° C , in vacuum .

 Once the final temperature has been attained ,

 the firing chamber is vented once again .

 Hold - time : 1 minute .

 It is absolutely essential to pre - dry the

 framework for 6 minutes at 550 ° C .

After the second firing , the opaquer should have an egg - shell finish .

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 .

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 incisal aspect of the dentine layer is then extended vertically

 with incisal and transparent porcelains and

 contoured as required . The porcelain should

 not be condensed whilst being built - up .

 The dentine , in comparison to the adjacent

 teeth , should be slightly over - extended

 vertically .

Once the restoration has been released from the model ,

 the contact areas are built - up with the

 appropriate dentine , opacious dentine

 and incisal porcelains and the interdental

 spaces separated with a sharp instrument

 ( razor blade , thin scalpel etc. ) .

  The first dentine firing is carried out at 920 ° C , in vacuum .

Once the final temperature has been attained ,

 the firing chamber is vented . 

Hold - time : 1 minute . 

The only reliable method of ascertaining

 whether the porcelain has been fired properly

 is to view it after firing . If it appears like the

 illustration opposite ( slightly glazed ) , the firing

 cycle was correct .

The bridge should be trimmed and cleaned

before adding further porcelain .

 The 2nd dentine firing is intended for adjusting

 the form of the bridge units only . Only small

 adjustments are made to the form .

  This firing is carried out at 910 ° C , in vacuum .

Once the final temperature has been attained ,

 the firing chamber is vented once again .

 Hold - time : 1 minute . If the porcelain has been

 fired properly , it will also appear slightly glazed

 after this firing .

Usually , only minimal adjustments have to be made to the form .

It is important that the surface morphology of

the restoration appears natural . It should

harmonize aesthetically with the adjacent 

teeth , which can be achieved with standard

tungsten carbide cutters .

   Once the bridge has been trimmed and cleaned ,

special effects can be added using the stains which are applied like water colours .

These stains are matched to one another

accurately and can be used to apply effects such as interdental or apical discolouration .

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

 This porcelain tends to exhibit a slight sheen only ,

which adds to its vitality .

The glaze of the restoration can also be matched to that in the mouth by polishing it with pumice and Sidol .

   " Creation" restorations reproduce shades absolutely accurately

and create a brilliant , iridescent effect even

though they are easily built - up .

  Creation -porcelains also exhibit exactly the right degree

of fluorescency which , even under extreme  lighting conditions , enables the restoration to blend absolutely naturally and harmoniously with the residual dentition .

  For further details , please refer to the

"Creation" - firing chart and shade determination chart .

Appearance

refer to the alloy manufacturer's instructions

slight shining

Egg-shell shining

slight shining

slight shining

slight shining

shining

Particle size distribution

Creation & dentine and enamel porcelains

Flexural strength according to ISO 9693:1991

Creation & dentine and enamel porcelains