CONTROL ID: 2600291
CONTACT: Stefan Vandeweghe
Abstract Details
CURRENT CATEGORY: Clinical
PRESENTATION TYPE: Oral
Abstract

TITLE:

A long-term retrospective study on tilted implants with an angulated connection at the implant neck

AUTHORS: Vandeweghe, Stefan; Boyes-Varley, Greg; Howes, Dale; Newell, Andy; DeBruyn, Hugo

ABSTRACT BODY:
Introduction:
Sometimes, implants have to be tilted to avoid perforating the buccal cortical plate, the maxillary sinus or the mandibular nerve. There are, however, some concerns towards the non-axial loading of the implant and the more complex restorative procedure. This study evaluated the long-term outcome of tilted implants with an angulated connection at the implant neck.

Method:
During a 12-year period, 751 angulated impants (Co-Axis, Southern Implants, Irene, South Africa) were placed in 331 patients (180 female, 151 male). 138 (41.7%) were not included in the study for various reasons: 97 could not be located, 18 were deceased and 27 were not interested to participate. Within the limitations of the study, 7 implants were reported failures (0.9%). Data were extracted from the patients’ files and bone level was evaluated using a recent radiograph.

Results:
193 patients (97 female, 96 male), mean age 54 years (SD 13, range 17-80) with 433 Co-Axis implants were evaluated. 231 implants were installed in females, 202 in males. 397 implants were located in the maxilla and 53 in the mandible. 386 implants had a 12 degrees angle at the implant neck, 44 implants a 24 degrees angle and 3 implants a 36 degrees. 2 late failures occured due to peri-implantitis.

141 implants (32.6%) were placed immediately after tooth extraction and 192 implants (44.3%) were loaded immediately within 48 hours. 19.9% of the impants were placed immediately after tooth extraction and loaded immediately with a provisional.

At 87 implants, some bone grafting was performed. In 31% of those cases, scraped bone was used, in 58.6% an anorganic bovine bone matrix (Bio-Oss) and in 9.2% autologeous bone from the hip was harvested. In only one case, some other type of material was used. In most cases (94.3%), an onlay graft was performed while in 5.7% of the cases, the bone graft was used to lift the sinus membrane.

Mean overall bone loss was 1.03 mm (SD 0.49, range 0.10 – 4.50) after a mean follow-up of 83 months (SD 21, range 3-143). Time of placement, time of loading, location, indication and implant size had no significant effect on the bone level. Based on the succes factors defined by Albrektsson & Zarb, the implant success rate was 99.1%.

Conclusion:
Tilted implants demonstrate a predictable outcome in various indications. No adverse effects from the non-axial loading could be detected.

A long-term retrospective study on tilted implants with an angulated connection at the implant neck
Image of the Co-Axis implant

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