Page 25 - DT Vol 15 No 3

aesthetics I
DENTAL TECHNOLOGY, JULY-SEPTEMBER 2025 25

CASE I: SIX ANTERIOR TEETH ON NEARLY UNIFORM STUMPS WITH PLENTY OF SPACE AVAILABLE

Fig 3: Colour choice for the anterior restoration design Fig 4: Abutments prepared for crown application

Fig 5: Provisional in PMMA, milled by CAD/CAM Fig 6: Final view of the natural crowns

Fig 7: Possible equipment Fig 8: Determination of tooth colour in the mouth of the patient Fig 9: In a direct colour comparison, the differences between the
for the photographic with the conventional Vita colour scale colour scale sample and the individual colour sample are easily
documentation of colour recognized. Only the individual colour sample is of great help due
determination as a basis for to the colour matching. This makes it possible to get very close to
colour matching the colour of the tooth in the reconstruction

Microstratification Definition:
• Veneering only in the visible area
• Use of special characterization colours with 3D effect
• Internal colouring technique + build-up
• Layer thickness from 0.1 to 0.6 mm

Special microstratification challenges
• Beam or base material (multilayer zirconium oxide)
has decisive influence: 80–90% of the esthetic result is
determined by the base
• Careful selection of zirconium oxide (accurate colour
determination)
• Ability to reproduce optical effects of light even with the
thinnest layers
• Use multilayer zirconia to ensure good colour matching
• Use ceramic concepts with feldspar-base, especially for
microstratification
• Secure bonding between base and veneering ceramics
Fig 10: Colour determination in detail with the individual colour sample (Colour-Index in oxide of • Internal characterization colours serving as a connector
zirconium original) between zirconia and veneering ceramic