| 3G Inlay / Onlay |
Preparation
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Onlay
Use a conventional inlay preparation with slightly rounded internal line angles. Taper internal walls 15o. Avoid making a narrow, thin isthmus between large mesial and distal masses. Occlusal reduction should be a minimum of 2.0 mm. Do not put the porcelain/enamel junction in an area of occlusal contact. Place a 90o shoulder at the gingival margin. All corners and angles should be rounded
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Inlay
Use preparation similar to the inlay preparation described here. Reduce occlusal cusps a minimum of 1.0 mm. Any corners or angles should be rounded. Finish facial and lingual margins with a 90o shoulder. Do not place the margin in an area of occlusal contact
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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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