simultaneous replacement of maxillary central incisors with cerec biogeneric reference technique: a case report

biogeneric reference technique (brt) of the cerec 3d v.3.8 software is an effective technique for single anterior ceramic crowns because it provides computer-controlled match of the tooth form to the contralateral tooth. brt also enables the fabrication of two or more anterior all-ceramic crowns simultaneously. this clinical report demonstrates the clinical application of brt for designing and milling two central incisors in one appointment using a single optical impression. after completing the virtual design of the first central incisor, it was copied and a mirror image was created. the second central incisor was designed using this replicated image and therefore a computer-controlled symmetry was obtained. the crowns were milled from monolithic feldspathic ceramic blocks and adhesively luted with dual-cured resin cement following dentin conditioning. at the two-year follow-up appointment, the restorations were intact, no adverse effects were noted, and the resultant appearance was highly satisfactory for the patient. a step-by-step protocol is described from design to cementation of these restorations.