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28 cosmetic section DENTAL TECHNOLOGY, JANUARY-MARCH 2024

EXCELLENT ESTHETICS WITH THE ‘ONE BAKE’

TECHNIQUE: PRECISE LAYERING AND STABLE FIRING

RESULTS WITH VITA LUMEX AC

SOFIANE OUAZENE

Dental technicians want a stable veneering ceramic that step with detailed microlayering and the leucite-reinforced glass
works as expected, while also covering every natural nuance from ceramic VITA LUMEX AC (VITA Zahnfabrik, Bad Säckingen,
the dentine core to the incisal edge. Firing stability and shade stabil- Germany).
ity are essential in this respect. After firing, it should be
possible to recognize the shape and shade of layering details in a FLUORESCENT FRAMEWORK
restoration. Otherwise, all the effort will have been for nothing. In the laboratory scanner, a plaster model with dies on tooth 11 and
This may sound obvious, but it is often not the case in practice. As 21 was used to generate a virtual model where two crown frame-
a result, dental technicians face something they really don't like: works were constructed from VITA YZ HT White zirconia and then
time-consuming corrective firing that can cause deviations in shade fabricated using CAD/CAM technology. Both copings were sand-
and shape every single time it is carried out. blasted to create a strong bond between the framework and the
That's why ‘one bake’ is the technique of choice, with results that veneer. The washbake with VITA LUMEX AC FLUO INTENSE sand
offer immediate shape and shade stability. In the following case and sesame was dusted with a thin layer of FLUO INTENSE arctic
example, dental technician Sofiane Ouazene (Algiers, Algeria), a white to control the fluorescent depth effect and to create a strong
specialist in all-ceramics, shows how this can be achieved step-by- bond with the subsequent layers.

FIG 1: Prepared for a full crown: model dies on 11 and 21. FIG 2: Frameworks fabricated using CAD/CAM technology: FIG 3: For a reliable bond, both framework structures were
made from VITA YZ HT White zirconia. sandblasted.

FIG 4: The washbake with FLUO INTENSE sand and sesame FIG 5: For an effective bond, a dusting of FLUO INTENSE FIG 6: In the lower third, a more chromatic DENTINE A3
supported the basic tooth shade depth effect. arctic white was also added. layering was added.

FIG 7: In the upper two thirds, a brighter DENTINE A1 dentin FIG 8: Buildup of the incisal area using a 1:1 combination of FIG 9: Following a cut-back, the mamelon structure was
core was created. DENTINE A1 and OPAL TRANSLUCENT opal neutral built upon using MAMELON honey melon.