Clinical Evaluation of Short and Wide-Diameter Implants Immediately Placed Into Extraction Sockets of Posterior Areas: A 2-Year Retrospective Study
The objective of the study was to determine the short-term success rate of short and wide single-tooth implants, immediately placed into extraction sockets of the posterior area. A retrospective cohort study design was used. A total of 145 subjects received 162 short and wide-diameter single-tooth implants between 2006 and 2009. A minimal 7-mm residual height and 9-mm ridge width was available in all the implant sites, and the attached gingivae were at least 2 mm wide. All implants were placed and restored with the single crown by one experienced operator. The data were analyzed with descriptive statistics. All implants were placed in molar areas. There were 20 Ankylos implants with a diameter 5.5 or 7 mm and a length of 8 mm and 142 hydroxyapatite-coated implants with a diameter 5 or 6 mm and a length of 5.7 to 8 mm. One of the 162 implants failed before prosthetic restoration, resulting in a survival rate of 99.4% after loading. Patients were followed for up to 56 months (mean = 24 months) after loading of implants. The radiographic and clinical data revealed well-maintained hard and soft tissues with acceptable short-term results. For residual ridges with minimal height but adequate width, the immediate placement of short and wide-diameter implants in fresh extraction sockets may offer a simple and predictable treatment alternative if implants are positioned appropriately after a thorough preoperative analysis.
A hydroxyapatite-coated 6 × 5.7 mm implant was placed in the maxillary first molar of a 45-year-old female patient. Note the surgical and prosthetic process. (a) The socket site prepared for implant placement. (b) Occlusal view of the implant placed into the extraction socket without flap elevation. An appropriate healing plug inserter was placed immediately after implant insertion. (c) A chamber space that occurred between the implant and the hard tissue was filled with harvested autogenous bone fragments, and (d) the soft tissue was sutured tightly around the abutments to allow non-submerged healing. (e) Then cone beam computerized tomography and (f) a periapical radiograph were taken to assess the 3-dimensional position of the implant. (g) The clinical situation showing the gingival profile 3 months after surgery. (h) The restoration and (i) concomitant X ray.
A hydroxyapatite-coated 6 × 8 mm implant was placed in the mandibular first molar of a 43-year-old female patient. (a) Non-submerged healing was allowed after implant insertion with flapless surgery. Clinical and radiographic situations were shown, respectively, (b and e) 3 months after installation, (c and f) 1 year later after loading, and (d and g) 2 years later after loading. (g) The vertical regenerative bone is shown around the implant.
Radiographic documentations demonstrate excellent stability of the crestal peri-implant bone. (a) Postplacement radiograph of implant site. (b) Radiograph 3 months after loading. (c) Radiograph 1 year after loading. (d) Radiograph 3 years after loading.
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