A One-year Follow-up Study of a Tapered Hydrophilic Implant Design Using Various Placement Protocols in the Maxilla

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.

A Simplified Prosthetic Implant Loading Protocol: 1-Year Clinical Follow-Up Study

“…All implants and prostheses remained in function following 1 year, giving a survival rate of 100%. This is in agreement with other 1-year follow-up studies using the Neoss implant system [ 9 , 23 ]. Radiographic analysis of the peri-implant bone showed that most of the bone remodeling occurred during the first 6 months in function (−0.49 ± 0.38 mm), and stable bone remodeling occurred between the 6-month and 1-year visit (+0.01 ± 0.28 mm).…”

“…Moreover, no significant International Journal of Dentistry differences were found for bone remodeling between implants placed in the healed bone and those placed in fresh extraction sockets. Previous findings with the Neoss implant system also reported on minimal bone remodeling for the first year in function [9,23] as well as for longer follow-up periods [24,25]. In the current study, only implants with an ISQ value higher than 60 at insertion were included for immediate load.…”

“…Long healing periods were originally advocated after tooth extraction, as well as after implant placement, in order to assure osseointegration of the implants prior to loading [4]. e development of clinical techniques, implant surface modifications, and optimization of implant macrodesigns has improved the conditions for achieving primary implant stability [5][6][7][8][9] and bone-to-implant contact [10][11][12]. ese developments have allowed for shorter healing times and early/immediate loading protocols with a successful clinical outcome [13][14][15][16][17].…”

Stability of tapered and parallel‐walled dental implants: A systematic review and meta‐analysis

“…Only 11 studies were eligible for full-text evaluation, of which, six studies were excluded. [27][28][29][30][31][32] The remaining five trials [33][34][35][36][37] were included for the present review ( Table 2). The hand search did not provide any further studies.…”

Validation of an implant stability measurement device using the percussion response: a clinical research study

“…The IST and ISQ values in this study were high. Zwaan et al [ 16 ] placed 163 implants in the maxilla and compared the IT at 50 Ncm, 40–45 Ncm, 30–35 Ncm, and ≤ 30 Ncm and found that the ISQ values were 76.2 ± 5.3, 72.3 ± 5.3, 70.0 ± 6.7, and 68.1 ± 6.2, respectively. The ISQ values were also reported to be higher for tapered implants than for straight implants.…”