GC EUROPE GRADIA - Manual (Page 11)

4. CLINICAL PROCEDURE
Determine whether GC GRADIA is suitable for the patient.
Indications: 1. Anterior and posterior jacket crowns. Full coverage crowns.
2. Anterior veneer metal-backed crowns, with or without incisal support.
3. Inlays, onlays, laminate veneers.
4. Implant superstructures.
Contra indications: Malocclusions, bruxism or clenching.
Tooth preparation and design of restorations vary according to circumstances.
The instructions for a correct preparation are illustrated below.
■ Anterior veneer crown
(With Incisal Support)
The preparation is similar to a PFM crown. The
margins should have a deep chamfer or shoulder
with minimum depth of 0.8mm. Thickness of
metal framework on the labial side should be
0.3mm.
■ Anterior jacket crown
Prepare abutment tooth similar to a PFM crown
(minimum of 1.3mm labial). Margin-design can
be a deeper chamfer or shoulder (0.8mm).
■ Posterior jacket crown
The occlusal reduction should be at least
1.3mm. Margins should have 1.3mm depth with
a deep chamfer or shoulder.
■ Inlay
Contour the cavity with rounded internal line
angles. Avoid contact of opposing occlusion
with the margins of restoration. The pit & fissure
minimum depth should be 1.0mm, the width of
occlusal surface at least 2.0mm with only shoulder
margins occlusally. Interproximally, it should
be box shaped.
■ Onlay
Contour the cavity with rounded internal line
angles. Avoid contact of opposing occlusion with
the margins of the restoration. Pit & fissure depth
minimum should be 1.0mm and cusp at least
1.3mm.
■ Margin preparations
Prepare deep chamfers (1)
or shoulders (2).
ABUTMENT TOOTH AND
CAVITY PREPARATIONS
0.3mm
0.5mm
2mm
0.8mm
1.3mm
0.8 1.0 mm
(0.8mm)
1.5 2mm
1.3 mm)
0.8 1.0mm
(0.5mm)
0.8 1.2 mm
(0.5mm)
1m m
1.3 m m
1.3 1.8 m m 1.3 1.8 m m
0.8 1m m
2.0 m m
1m m
1.3 m m
1m m
1.3 1.8m m
0.8mm
min. 0.8mm
min.
ORAL EXAMINATION
9
YES YES NO NO