The restoration design described in this case report guarantees a biocompatible transmucosal zone and prevents cement excess. Bone remodeling is reduced thanks to the asymmetrical Variobase® abutment and this biocompatible restoration design (Fig. 19). The new implant diameter gives us clinicians the opportunity to provide our patients with clinically acceptable implant restorations even in confined spaces (Fig. 20).
PRODUCT INFORMATION BY THE MANUFACTURER
A 21-year-old male patient presented with a missing tooth 31 after an earlier trauma. The clinical diastema was only 4.5mm, whereas 5.5mm of space was available at bone level (Figs. 1,2).
The CT image showed sufficient bone width for implant placement without prior bone augmentation (Fig. 3). However, since the anatomy of the underlying bone would direct the implant into a buccal angulation, a buccal screw access hole or cement-retained restoration was therefore inevitable. Figure 4 demonstrates the clinical situation directly before implant surgery.
After the administration of local anesthetics, a small midcrestal incision – without releasing incisions – was made. The osteotomy was prepared using the new 1.6mm needle drill and finished using the 2.2mm pilot drill (Figs. 5,6). Since the bone was soft, no profile drill or tap was employed. The osteotomy was created within the bony envelope, and the future implant site was surrounded by native bone, although a slight buccal contour change was discernible (Fig. 7). A Straumann® BLT SC 2.9mm/12mm SLActive® implant was selected and inserted in the correct buccal orientation (Figs. 8-10). Although the implant was surrounded by bone, due to the contour dip it was decided to augment the buccal contour (Fig. 11). In view of the shape of the lower incisors and the limited space, a special asymmetrical two-piece healing abutment was designed by the manufacturer and placed accordingly (Figs. 12,13). After abutment insertion the buccal contour was augmented using a slowly resorbing DBBM-graft (Fig. 14). Two single interrupted sutures (polypropylene 6-0) were used to close the surgical site. Directly after surgery a periapical radiograph was obtained to verify the implant position (Fig. 15).
Three months after implant placement the implant was well osseointegrated, and an open-tray conventional impression was taken (Fig. 16). Due to the buccal angulation of the implant it was decided to create a screw-retained zirconia coping luted on a 2mm Variobase® abutment with an adhesively cemented lithium disilicate veneer (Figs. 17,18).