•
Occlusal
reduction : One of the most important features for providing adequate bulk of
metal and strength to the restoration is occlusal clearance.
•
For gold alloys-
1.5 mm clearance on the functional cusp (lingual of maxillary molars and
premolars and buccal of mandibular molars and premolars ).
•
1mm clearance on
the nonfunctional cusp.
Occlusal Reduction
•
The basic inclined plane pattern of the occlusal
surface duplicated to produce adequate clearance without over shortening the
preparation.
•
A flat occlusal surface may over shorten the
preparation.
Inadequate Occlusal Reduction
• Makes the restoration weaker.•
will not provide adequate space to allow good
functional morphology under the anatomical grooves.
•
The restoration easily perforated by finishing
procedures or by wear in the mouth.
