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Preparation
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Onlay
Reduce the facial surface 0.5 - 0.7 mm and form a continuous chamfer at the proximal and gingival margins. The preparation should be at the height of the gingival crest. Maintain interproximal contact. If the bite is on the lingual surface, it is not necessary to wrap the incisal edge. If the bite is edge to edge incisally, wrap the incisal edge. Reduce it 1.0 mm and round the mesial and distal incisal angles. The incisal edge wrap should end in a shoulder on the lingual surface or a butt joint. Remove all undercuts to allow passive fit.
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Cementation
An abbreviated technique follows.
Step 1: remove the provisional restoration. Clean and dry the site
Step 2: verify the fit of the restoration utilizing a try-in paste or glycerin
Step 3: isolate the prepared tooth with a rubber dam and retainer
Step 4: apply and light-cure the dental adhesive
Step 5: treat the internal aspects of the restoration with a silane coupling agent
Step 6: apply an aesthetic resin cement to the surface of the restoration
Step 7: seat the restoration and remove gross excess cement
Step 8: light-cure the entire restoration from all surfaces
Step 9: adjust and finish with fine diamonds and polishers
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