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Spiral implants bearing full-arch rehabilitation: analysis of clinical outcome

By M. Danza, F. Grecchi, I. Zollino, C. Casadio and F. Carinci


Abstract Background: A spiral implant is a conical internal helix implant with a variable thread design which confers the characteristic of self drilling, self tapping and self bone condensing. Reports have reported the effectiveness of this type of implants in several clinical situations. However, because there are no reports that specifically focus on one of the biggest challenges in oral rehabilitation, i.e. the full arch rehabitation, it was decided to perform a retrospective study.Materials and Methods: The study population was composed of 23 patients (12 females and 11 males, median age 57 years) for evaluation and implant treatment between January 2005 and June 2009. 206 Spiral family implants (SFIs) were inserted with a mean post loading follow-up of 23 months. Several variables were investigated: demographic (age and gender), anatomic (maxilla and mandible, tooth site), implant (type, length and diameter), surgical (surgeon, post-extractive, flapless technique, grafts) and prosthetic (implant/crown ratio, dentition in the antagonist arch, type of loading and CT planning) variables. Implant loss and peri-implant bone resorption were evaluated. Univariate and multivariate test were performed.Results: Survival and success rates were 97.1 and 82.5\%, respectively. Only implant length and implant/crown ratio were statistical significance in determining a better clinical outcome.Conclusion: In conclusion, SFIs are a reliable tool for most difficult cases of oral rehabilitation. No differences were detected among implant type. Length and implant/crown ratio can influence the crestal bone resorption with better result for longer fixtures and an higher implant/crown ratio. In addition banked bone derived from living donors can be used to restore alveolar ridge augmentation without adverse effects. Finally, flapless and CT-planned surgery did not significant increases the clinical outcome in most complex rehabilitation

Year: 2011
DOI identifier: 10.1563/AAID-JOI-D-09-00140.1
OAI identifier: oai:iris.unife.it:11392/1398541
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