Hybrid abutments preparation in combination with zirconia crowns
1-2. Patient in need of two full crowns on 1st and 2nd lower premolars. Because Class V lesions and the tight root positions it was decided to prepare with a buccal minichanfer and knife interproximal and lingual edge margin placed iuxtagengivally.
3-4. Two wedges with matrix were used to open the interproximal spaces and to protect adjacent teeth.
5-6. The chanfer finishing line at buccal margin is clearly iuxtagengival.
7. The knife edge preparation, in the interproximal and lingual margins, is iuxtagengival too.
8-10 Impression with traditional material.
11-15. Stone dies where the margins are detected by the technician.
16-17. Scans of the preparations.
18-19. Try-in of the zirc monolithic crowns.
20-21. The final crowns.
22-23 The crowns immediately after being luted.
24. After 6 months of clinical service.
Case by Prof. Marco Ferrari and Mr. Gianni Bonadeo