Ivoclar Vivadent SR Adoro - Manual (Page 24)

24
Adoro
®
–
Practical Procedure
for Framework-Free Restorations
(Anterior Crowns)
SR
Preparation Guidelines and Minimum
Layer Thicknesses
Veneer
If possible, the preparation should be entirely located in the enamel.
Either design a classical preparation with oro-incisal, chamfer-type
embrasure of the incisal edge, or a simple incisal reduction without
embrasure of the incisal edge. Avoid incisal preparation margins in
functional or abrasion surfaces. The minimum preparation thickness
is approx. 0.6–1.0 mm depending on the preparation technique
selected. Dissolution of the proximal contacts is not required.
Discoloured teeth may require more preparation. The extent of the
incisal reduction depends on the desired translucency. The more
translucent the incisal edge of the intended veneer is to appear, the
more pronounced the reduction should be.
Anterior crown
Evenly reduce the anatomical shape and observe the stipulated
minimum thickness. Prepare a circular shoulder with rounded inner
edges or a pronounced chamfer of at least 0.8 mm. In the anterior
region, reduce the labial and/or palatal / lingual surfaces by at least
1.0 mm. Reduce the incisal crown third by at least 1.5 mm. Design
transitions in such a way that no angles or edges are present.
0.8
0.8
≥ 1
≥1
1.5
10°-30°
0.6
0.7
10°-30°
1.0