Seite 7 - Quintessenz Zahntechnik

STEP BY STEP

TRANSLUCENT ZIRCONIA

155

Quintessenz Zahntech 2013;39(2):150–160

entire occlusal and proximal contact points, which were defined in Ceramill Zolid, had

to be polished manually to a high lustre after sintering. Tooth 16 was designed fully

anatomically. Figs 17 and 18 show the bridge on the model.

For tooth 17, the author had planned an abutment based on a material combination

consisting of non-precious metal, zirconia and temporary PMMA resin. The abutment

was milled from Ceramill Sintron

®

, a new chromium cobalt (CrCo) sinter metal that

has a similar technical process to zirconia (Fig 19), conventional opaque

3

for bonding

porcelain was applied after sintering and in the final stage the abutment was then ad-

hesively retained with the titanium base. After sintering, the Ceramill Sintron

®

CrCo

alloy

2

, which is dry milled using the Ceramill Motion or Ceramill Motion 2, can be

finished and polished much more easily than a cast CrCo framework, as it has a lower

Vickers hardness (HV10: 280), the structure is more homogenous and has a much finer

grain structure.

1

The author had also sprinkled a margin powder on the surface of the opaque (Fig 20)

and fired it (circumferentially, however, only by approx 1.5 mm towards the abutment

Fig 16 Screenshot of the

dynamically designed guide

surfaces on the palatal surfaces

of teeth 13, 11 and 21 in the

Ceramill Mind CAD software.

Fig 17 Buccal view of the bridge on teeth 13 to 16.

Fig 18 Palatal view of the superstructure on teeth 13 to 16.

Abutment on tooth 17

with PMMA crown

Fig 19 Step-by-step views

of the CrCo abutment on

tooth 17 milled from Cera-

mill Sintron,

a

in the milled

state (green body stage),

b

the result immediately after

sintering, still untrimmed and

c

with fired opaque, adhesively

retained titanium base and

polished to a high lustre.

a

b

c