Immediate placement and restoration of a Straumann BLX implant replacing central and lateral incisors
A clinical case report by Karim Dada , Léon Pariente, Marwan Daas, Julien Montenero
Placing an implant immediately after tooth extraction offers several advantages including a reduced treatment time, fewer surgical sessions, possibility of implant fixed temporization, preservation of soft tissue contour and also of the interdental papillae . Immediate implant placement into fresh extraction sites has been described to be a predictable and successful procedure when proper protocols and case selection are followed. The success of immediate implant placement and temporization procedure relies greatly on sufficient primary stability of the implant. The latter depends on the volume of available bone beyond the root apex as classified by Kan et al. and on the choice of the implant, its macro-design and the drilling protocol. BLX implants (Straumann, Switzerland) were designed to achieve high primary stability when placed immediately after extraction.
Dr. DDS, MS
Graduated with a degree in dental surgery and post-graduate certificates in implant prosthodontics and implant surgery from the Paris Descartes University. Dr Dada was recognized in 2005 by the Académie Nationale de Chirurgie Dentaire for his work in providing implant treatment to patients with head and neck cancer who are undergoing radiotherapy.
Dr Dada maintains a private practice in Paris focusing on perio-plastic surgery and implant dentistry.
Private practice in Paris limited to Implantology and Periodontology. Graduate of the University of Paris Rene Descartes. Advanced Program in Implant Dentistry at the New York University College of Dentistry (2012). Several research projects at the Prosthetic and Implant Department of the University Paris Rene Descartes.
Graduated with a degree in dental surgery and a doctorate in biomechanics from the Paris Descartes University. He is a lecturer on prosthodontics and implant dentistry in the Departement of Dental Surgery at Paris Descartes University.
Recognized in 2009 by the Académie Nationale de Chirurgie Dentaire for his work on the finite element modeling of implant treatment.
He maintains a private practice in Paris limited to esthetics and complex prosthetic réhabilitations.
Julien Montenero has worked actively as a dental technician for over 20 years focusing on esthetic prostheses and CAD/CAM restorations. He has a private laboratory specialized in complex prosthodontics and maxillofacial rehabilitation since 2004 in Paris, France. In 2011, he graduated in Applied Facial Prosthetics at the Faculty of Medicine of the Université Pierre-et-Marie-Curie (now Sorbonne University) in Paris. www.atelier-jm.fr
A 52-year-old man, non-smoker in good general health, was referred after the diagnosis of post-traumatic resorption that affect the root of teeth #11 and #12 (Fig. 1a, Fig. 1b). The patient had a previous consultation with an endodontist who stated that both teeth were hopeless and therefore the extraction was required.
Clinical examination revealed a full healthy periodontium on tooth #12 with no sign of infection. On tooth #11 a slight tissue edema associated with chronic irritation in front of the extensive resorption was appreciated.
Intermaxillary relationship were normal and the analysis of the smile showed a low smile line (Fig. 2).
Tooth #21 was already replaced by an implant-supported crown.
The previously prescribed Computerized Tomography showed that the resorption process was more advanced on tooth #11 (Fig. 3).
Teeth #11 and #12 were diagnosed as hopeless. From a periodontal point of view the clinical situation was considered as favorable for an immediate implant procedure: gingival margin and papillae are at the same level on these teeth than on the controlateral ones. We used the former CBCT to evaluate the bone volume in the apical area of #11 and #12, as well as the integrity of the buccal plate on both sites (Fig. 4). The examination of the CBCT showed that the buccal plate was intact 3 mm below the gingival level and correlated to the clinical examination the future extraction socket was determined as Class I of Elian(1). The bone volume correlated to the axis of the tooth was considered as favorable for immediate implant placement, Class I of Kan(2). However, we know from literature that adjacent implants in such clinical scenario behave poorly because of the small distance between the platform and that in this kind of situation the probability of the inter-implant papillae loss is quite high. We also know that a staged approach for the extraction of these two incisors will give better result from a soft-tissue point of view (4,5,6,7). According to all these parameters, we decided to go first for an immediate implant placement procedure after extraction of #11. Immediate temporization was intended under the condition of sufficient primary stability of the implant. The implant chosen for this procedure was a Straumann BLX Implant 4.5x12 mm. After a proper healing period, tooth #12 will be extracted and after a socket preservation procedure and proper soft tissue healing around a temporary prosthesis, a zirconia cantilevered fixed implant supported bridge will replace these two teeth.
Immediate implant procedure on #11. Tooth #11 was extracted atraumatically without raising a flap or osteotomy (Fig. 4). The extraction socket was meticulously cleaned and rinsed with Betadine. The drilling sequence included 2.2mm, 2.8mm, 3.2 mm and 3.7mm drills (Fig. 5). The implant was placed with a final Torque of 80 N.cm (Fig. 6, 7). In its final position, the implant platform lied 4 mm under the ideal gingival margin (at the same level of the adjacent implant platform)(Fig. 8). A RB titanium temporary abutment for crown was placed and a laboratory made shell was positioned without interference of the temporary abutment (Fig. 9). The surgical site was protected with a small piece of rubber dam (Fig. 10) and the position of the abutment was connected to the shell with a dual-curing luting composite (Fig. 11). The development of a proper emergence profile will be done extra-orally (Fig. 12) to get the screw-retained temporary crown.
Before placing the provisional crown, the gap between the implant and the buccal plate was filled with a particulate Xenograft material (Cerabone, Botiss). The graft was packed up to the gingival margin according to the DualZone principle described by Chu et al (3) (Fig. 13). The screw retained temporary crown was then torqued to 35 N.cm. (Fig. 14)
Extraction and socket preservation on #12. Three months after placement, tooth #12 was extracted (Fig. 15) and a socket preservation procedure was applied. The socket was filled with a particulate Xenograft material (Cerabone, Botiss) (Fig. 16) and closed with a free gingival graft taken from the tuberosity (Fig. 17). A cantilevered temporary bridge was then torqued to 35N.cm.
2 months after #12 extraction, an implant level impression was taken for final restoration using a digital scan body (Fig. 18) and a digital intraoral scanner (Trios, 3Shape). A zirconia cantilevered fixed implant supported bridge was done according to a full Digital workflow (Fig. 19, 20).
The screw-retained zirconia cantilevered fixed implant supported bridge was then torqued to 35N.cm. (Fig. 21, 22).
Follow-up 10 months after implant placement showed a well- preserved gingival contour (Fig. 23,24)
Immediate implant placement and temporization, when properly indicated has three main advantages: timing, biology and prosthetic.
Treatment time and number of surgical procedures are reduced compared to a delayed approach.
From a biological stand point, using a slow-resorbing material to fill the gap between the implant and the buccal plate allows to predictably preserving the bone volume. The provisional crown supports the gingival architecture and helps maintaining the pre-existing positions of the gingival margin as well as mesial and distal papillae.
When replacing multiple adjacent teeth and when it’s possible a staged approach for the extractions will give better result and the use of cantilever can allow a better soft tissue preservation in case of reduced width.
Prosthetically, placing an implant retained provisional crown on the day of surgery simplifies the temporization in the anterior area, allowing the patient to leave the office on the same day with a fixed provisional.
The success of this procedure relies on three basic principles: proper indication, atraumatic extraction and sufficient primary stability of the implant. The latter depends widely on the choice of the implant design and drilling protocol, which should be thought for greater primary stability.
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