vita YZ HT, Instructions For Use Manual, Page: 4 / 12

Instructions for use
VITA YZ SOLUTIONS discs and blocks are blanks used for fabricating dental restorations.
1. Indication:
VITA YZ T and VITA YZ HT (type II, class 5; CTE 10.5x10
-6
/K, according to DIN EN ISO 6872):
Fully anatomical crowns and bridges with up to 14 units* in the anterior and posterior
area; fully and partially veneered single tooth and bridge substructures* with up to 14
units in the anterior and posterior area; single tooth and bridges* with up to 14 units on
direct screw-retained restorations in the anterior and posterior area; primary telescopes
VITA YZ ST** (type II, class 5; CTE 10.3x10
-6
/K; according to DIN EN ISO 6872):
Fully anatomical crowns and bridges* with up to 14 units** in the anterior and posterior
area;, fully and partially veneered single tooth and bridge substructures* with up to
14 units** in the anterior and posterior area; single tooth and bridges* with up to 14
units** on direct screw-retained restorations in the anterior and posterior area; inlays,
onlays, veneers, partial crowns
VITA YZ XT (type II, class 4a; WAK 10.0x10
-6
/K, according to DIN EN ISO 6872):
Fully anatomical single crowns and bridges with up to three units with one bridge
pontic; fully and partially veneered single crown and bridge substructures with up to
three units with one bridge pontic in the anterior and posterior area; inlays, onlays,
veneers, partial crowns
* Bridges and bridge superstructures with maximum of two adjoining bridge pontics
** VITA YZ ST is limited in Canada to bridge indications with a max. of six units with a
max. of two adjoining bridge pontics.
2. Contraindication:
VITA YZ T / VITA YZ HT / VITA YZ ST: for more than two adjacent bridge units; for two or
more cantilever bridge units; parafunctions for veneered restorations, in particular for
bruxism; for insufficient oral hygiene; for insufficient preparation results; for insufficient
hard dental tissue; for patients suffering from allergies or sensitivities to the constituents;
temporary bonding of VITA YZ ST
VITA YZ XT: for bridge restorations with more than three units; cantilever bridges;
parafunctions for veneered restorations, in particular for bruxism; for insufficient oral
hygiene; for insufficient preparation results; for insufficient hard dental tissue; for
patients suffering from allergies or sensitivities to the constituents; for temporary bonding
3. Design parameters
All information refers to
sintered restorations
Minimum wall thickness in mm Connector cross-sections in mm
2
VITA
YZ T
VITA
YZ HT
VITA
YZ ST**
VITA
YZ XT*
VITA
YZ T
VITA
YZ HT
VITA
YZ ST
VITA
YZ XT
Inlay, onlay, veneer
incisal
occlusal
circumferential 0.5
0.5
0.4 0.5
0.5
0.4 0.6
0.6
0.5 0.8
0.8
0.7
– – – –
Anterior and posterior
crowns (fully anatomical or
substructure) incisal
occlusal
circumferential 0.5
0.5
0.4 0.5
0.5
0.4 0.6
0.6
0.5 0.8
0.8
0.7
– – – –
Fully anatomical anterior
bridges and substructures
with one pontic*
incisal
circumferential 0.5
0.5 0.5
0.5 0.6
0.6 1.0
0.8
7 7 9 9
Fully anatomical posterior
bridges and substructures
with one pontic*
occlusal
circumferential 0.6
0.5 0.6
0.5 0.7
0.6 1.2
1.0
9 9 12 12
Fully anatomical multi-unit
anterior bridges and sub-
structures with two pontics
incisal
circumferential 0.6
0.5 0.6
0.5 0.8
0.6
– 9 9 12 –
Fully anatomical multi-unit
posterior bridges and sub-
structures with two pontics
occlusal
circumferential 0.7
0.6 0.7
0.6 0.8
0.6
– 12 12 15 –
Cantilever bridges with an
extension
incisal
occlusal
circumferential 0.7
0.7
0.5 0.7
0.7
0.5 0.8
0.8
0.6
– 12 12 15 –
*) VITA YZ XT is limited to maximum of three units.
**) In Canada VITA YZ ST is limited to bridges with six units.
Please note:
When designing the framework, pay attention to anatomically reduced tooth shapes.
The cusp should be supported according to the anatomical progression. When preparing
a ceramic veneer, a uniform layer thickness across the entire surface to be veneered
must be ensured. The entire thickness of the ceramic layer, however, should not exceed
2 mm (the optimal layer thickness ranges from 0.7 to 1.2 mm).
When designing fully anatomical restorations, the minimum wall thicknesses for the
respective material must be observed. The aim is to obtain a uniform material thickness.
Clinical success cannot be reliably assured in the event that compliance with the given
design guidelines and minimum wall thickness is not met.
4. CAD process
For seven units or more, a sinter support for the milled restoration should be designed
for bridge frameworks from VITA YZ T / HT / ST. If no sinter support is attached to these
bridge structures, it is possible for distortion to occur as a result of the sintering process,
which may in turn lead to an imprecise fit in the finished restoration.
The instructions on the design of the sintering support from the individual software
manufacturers are to be observed.
However, if this sinter support consists only of a leftover piece of the disc (sintering
tongue), the volume should be reduced to ensure even heating during the sintering
process.
5. Enlargement factor
All VITA YZ materials are porous before sintering. Sintering acts as a kind of "compression
process," which results in the materials shrinking by approximately 20%. As a result, all
restorations must be milled according to the specified enlargement factor to compensate
for the shrinkage of the material during the sintering process. The corresponding blank
imprint must be entered into the respective CAM software (as plain text on the disc or
as a barcode on the block). Some software requires the factor (e.g., enlargement factor
1.2345) for the discs or the corresponding X, Y values (e.g., VGF: X, Y = 23.45) and for
some providers, also the Z values (e.g., Z = 23.01). For blocks, the corresponding barcode
is scanned into the CAM software.
6. Milling the restorations
VITA YZ processing must be performed with a validated CAD/CAM system. For information
on the processing parameters, see
"Processing information for VITA YZ CNC machines." Further information is available on
the internet at: https://www.vita-zahnfabrik.com/systempartner
• VITA SYSTEM SOLUTIONS with specific holder systems for: inLab System (Sirona
Dental Systems GmbH); CEREC System (Sirona Dental Systems GmbH)
• VITA UNIVERSAL SOLUTIONS in universal disc geometries ( 98.4 mm) for the
following CAD/CAM systems: CORiTEC series (imes-icore GmbH); ULTRASONIC series
(DMG Mori AG); RXD line (Röders GmbH); inLab MC X5 (Sirona Dental Systems GmbH);
S1/S2/K3/K4/K5 Impression (vhf camfacture AG)
Please note: restorations from VITA YZ ST and VITA YZ XT are not to be milled wet.
They must be milled dry.