Page 31 - DP Vol 19 No 6 pw_Neat

was cast with epoxy resin (Figures 12 and 13). After the required
curing time, the gear rim was removed and divided into segments.
These segments were separated with a separating disk (Figures 14 and
15). After grinding, the segments were repositioned in the impression
(Figures 16 to 19). With the aid of casting resin, a Geller model was
created (Figures 20 and 21).
In the next step, the model was in the facebow, and this position
was transferred to the articulator (Figures 22 and 23). The individual
elements were duplicated with refractory material (Figures 24 to 26),
allowing for direct ceramic layering on the teeth. (Figures 27 and 28).
After finalization, the veneers were prepared for visual inspection of the
surface texture and the ridges were dusted with gold powder (Figures
Fig 27 Fig 28 29 to 31). The thickness of the veneers was also controlled (Figure
Fig 27-28: Ceramic layering directly on the refractory material 32). After completion, the veneers were separated from the refractory
material (Figures 33 to 36). Before final cementation, the veneers were
tried in to make necessary adjustments and visualize the final result.
The use of try-in pastes was essential in order to select the right cement
shade. In this case, a light color with medium opacity was selected to
better mask the discoloration of the underlying enamel.
After the approval of the patient, we proceeded with the final
Fig 29 cementation of the veneers. The teeth were etched with 37%
[5]
orthophosphoric acid for 20 seconds . Subsequently a one component
adhesive was applied,“massaged in” for 15 to 20 seconds and light-
cured according to the manufacturer’s instructions. The surfaces of
the feldspar ceramic veneers were treated according to the following
criteria: the first step was drying and internal cleaning of the porcelain
surface (Figures 37 and 38), followed by inner surface etching with nine
percent hydrofluoric acid for two minutes (Figure 39). Subsequently,
this was cleaned under flowing water and dried with compressed air;
Fig 30 after this step, the surfaces were neutralized for five minutes (Figure 40).
After the reaction time had elapsed, they were rinsed again thoroughly
and dried with air. The silane was then allowed to evaporate for one
minute and the adhesive was applied according to manufacturer’s
instructions (Figure 41). Finally, on the inner surface of the veneers on
the previously treated teeth prior to placement, light curing composite
cement (Figure 42) was applied. The positioning was done with try-in
paste (Figures 43 to 46).

Fig 31
Fig 29-31: After finalization, the veneers were dusted with gold
powder to visually check the surface texture and the ridges.

Fig 33 Fig 34

Fig 35 Fig 36

Fig 33-36: After completion, the shells were separated from the refractory
Fig 32: The thickness of the veneers was also controlled. material.

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