Abstract
Purpose:To study the clinical/radiographic outcomes and stability of a tapered implant design with a hydrophilic surface when placed in the maxilla using various protocols and followed for one year.Methods:Ninety-seven consecutive patients treated as part of daily routine in two clinics with 163 tapered implants in healed sites, in extraction sockets and together with bone augmentation procedures in the maxilla were evaluated after one year in function. Individual healing periods varying from 0 to 6 months had been used. Insertion torque (IT) and resonance frequency analysis (RFA) measurements were made at baseline. Follow-up RFA registrations were made after 6 and 12 months of loading. The marginal bone levels were measured in intraoral radiographs from baseline and after 12 months. A reference group consisting of 163 consecutive straight maxillary implants was used for the comparison of baseline IT and RFA measurements.Results:Five implants failed before loading, giving an implant survival rate of 96.9% and a prosthesis survival rate of 99.4% after one year. The mean marginal bone loss after one year was 0.5 mm (SD 0.4). The mean IT was statistically significantly higher for tapered than for straight reference implants (41.3 ± 12.0 Ncm vs 33.6 ± 12.5 Ncm, p < 0.001). The tapered implants showed a statistically insignificantly higher mean ISQ value than the straight references implants (73.7 ± 6.4 ISQ vs 72.2 ± 8.0 ISQ, p=0.119). There was no correlation between IT and marginal bone loss. There was a correlation between IT and RFA measurements (p < 0.001).Conclusion:The tapered implant showed a high survival rate and minimal marginal bone loss after one year in function when using various protocols for placement. The tapered implant showed significantly higher insertion torque values than straight reference implants.
Highlights
Tooth replacement utilizing implant-supported prosthetic devices has been demonstrated to be a predictable1874-2106/16 2016 Bentham OpenA One-year Follow-up Study of a Tapered HydrophilicThe Open Dentistry Journal, 2016, Volume 10 681 treatment modality based on 50 years of clinical experience and long-term follow-up studies [1 - 3]
There was no correlation between insertion torque (IT) and marginal bone loss
There was a correlation between IT and resonance frequency analysis (RFA) measurements (p < 0.001)
Summary
The Open Dentistry Journal, 2016, Volume 10 681 treatment modality based on 50 years of clinical experience and long-term follow-up studies [1 - 3]. In modern implant dentistry implants are used in challenging situations due to compromised anatomy that in the past was considered as inappropriate for implant treatment. Several surgical techniques such as sinus floor elevation, split crest and guided bone regeneration (GBR) have found widespread use to compensate for insufficient bone volumes [5 - 7]. With regard to macroscopic design, studies have shown improved primary stability for implants with a tapered body compared to a parallel-walled design [10 - 12]. The majority of modern implants have a moderately rough surface as produced by blasting, etching and anodic oxidation or a combination of these techniques [9]
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