Horizontal maxillary reconstruction in the esthetic zone
A clinical case report by Thomas C. Truninger, Switzerland
This case study describes the successful use of the botiss maxgraft® bonering for complex horizontal maxillary reconstruction in the esthetic zone. This approach can be considered as a successful treatment option for simultaneous implant placement and horizontal augmentation of bone in certain defects.
Dr. med. dent.
Specialist in Reconstructive Dentistry, Swiss Society of Reconstructive Dentistry. Specialist in Oral Implantology and General Dentistry, Swiss Society of Dentists (SSO). Dr. Truninger graduated summa cum laude in dentistry from the University of Zurich, Switzerland, in 2003. He then specialized in Reconstructive Dentistry and Implantology at the Department of Fixed and Removable Prosthodontics and Dental Material Science, attending the postgraduate program under Prof. Ch. Haemmerle from 2008-2011. Since 2013 he has taught Implantology and Reconstructive Dentistry as an instructor and senior teaching and research assistant at the University of Zurich. He also runs a fully digital private practice focusing on Implantology, Surgery and Esthetic Reconstructive Dentistry in the heart of Zurich since 2014. His research interests include implantology and digital workflows with tooth- and implant-supported reconstructions.
Initial situation and treatment planning
The 56-year old female patient was referred to the author’s clinic for reconstruction of the upper right maxilla. She was undergoing a full mouth reconstruction with FPDs performed by the referring dentist and still wore provisional crowns at the time of surgical treatment (Figs. 1-2). Since she had a fear of dentists, the patient had previously avoided any replacement of the insufficient reconstructions and was wearing a removable provisional denture in the upper right jaw.
This case report covers the surgical part of the reconstruction of the upper right by means of a botiss maxgraft® bonering in position #12, with simultaneous implant placement in region #13 and a simultaneous sinus lifting procedure and implant placement in region #16. An x-ray recorded after periodontal treatment and re-evaluation showed a horizontal defect in the area of tooth #12 (Fig. 3) and insufficient bone for implant placement in position 16 (Fig. 4) without augmentation of the maxillary sinus.
Premedication consisting of 2.25 mg of amoxicillin and 600 mg of ibuprofen were given one hour prior to surgery, and the patient rinsed her mouth with a chlorhexidine solution for one minute. Next, a mucoperiosteal flap was raised (Figs. 5-6) and a 6x7mm window prepared in the lateral sinus wall (Fig. 7). With the help of a surgical stent, the implant positions were determined using the 2.2 pilot drill (Figs. 8-9). As expected, a horizontal defect was found in positions 12 and 13. A trephine bur with external and internal diameters of 7 and 6 mm, respectively, was used to prepare the bed for a 6 mm botiss maxgraft® bonering (Figs. 10-11), paying particular attention not to perforate the palatal wall or remove too much of the patient's own bone. A planator was used to create a flat surface at the bottom of the trephined area in order to produce a perfect fit for the bonering. The maxgraft® bonering was adapted to the desired length using the holding instrument (Fig. 12), and a 2.8 mm bur was used for the final drilling procedure. After soaking the bonering for several minutes in the patient’s blood (Fig. 13), a 3.3x12mm Straumann BLT Implant (SLA®) was placed in position #12 through the bonering, which was tightened and compressed to the recipient bone (Fig. 14). Since the implant and bonering stability were excellent, no membrane screw was needed to further stabilize the ring, and a 0.5mm NC cover screw was placed. In position 13, a 4.1x8 mm Straumann BLT implant (SLA®) was placed inside the newly formed bony contour, and the harvested bone was collected. Meanwhile, the trephine bur for the implant in position #12 was used to augment the bone buccally to the implant at #13 (Fig. 15). In position 16, a sinus lift procedure was performed, keeping the Schneiderian membrane intact and using a xenogenic bone augmentation material while placing a 4.1x10 mm RC Straumann BLT (SLA®) Implant. Guided bone regeneration was done, covering the lateral window of the sinus, the implant in position 12 with the botiss maxgraft® bonering and the implant in position 13 with a xenogenic bone substitute and 20x30 botiss Jason® membrane (Fig. 16). The position of the implants was rechecked by means of x-rays (Figs. 17-18). Titanium pins were used to immobilize the membrane. After a periosteal releasing incision, the flap was sutured without tension (Fig. 19). The sutures were removed ten days later and the wound healing was good. Six months later, an apically repositioned split-flap was performed to augment the amount of attached gingiva bucally to the implant, and three Straumann gingiva formers were placed. After suture removal, the patient was sent back to the referring dentist for the subsequent prosthetic procedures and finalization of the implant-mounted screw-retained reconstruction.
Treatment outcome and conclusion
At follow-up 2 months after implant loading, the bone level seemed to be stable, and the esthetic outcome was satisfactory (Figs. 20-22). The vertical defect, which was not altered in this case due to the patient’s low lip line, was covered by the pink ceramics. The patient was highly satisfied with the outcome of the treatment in the upper right mandible. Further examination and a strict follow-up regimen will show the long-term stability of the augmented bone. It can be concluded that the use of a botiss maxgraft® bonering can be a successful treatment option for simultaneous implant placement and horizontal augmentation of bone in certain defects favoring this technique.