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Immediate Function of 3.25 mm Diameter Implants in Aesthetic Regions. An 18-month Clinical, Radiographic and Resonance Frequency Analysis (RFA) Study.

Journal article
Authors Leonardo Vanden Bogarde
Antonio Guida
Daniele Moretto
Stefano Sicuro
Davide Sala
Lars Sennerby
Published in Journal of Dental and Maxillofacial Research
Volume 2
Issue 2
Pages 1-6
Publication year 2019
Published at Institute of Odontology
Pages 1-6
Language en
Subject categories Dentistry

Abstract

The aim of the study was to evaluate the use of narrow implants (3.25 mm) to replace upper lateral and lower incisors according to an established immediate function protocol. A total of 49 narrow implants (Neoss Proactive 3.25 mm implants, Neoss Ltd, Harrogate, UK) in 35 patients were evaluated. Thirty-one implants were placed in the mandible and 18 in the maxilla. The mean insertion torque was measured in Ncm. Thirty-six implants were placed in fresh extraction sockets. Implant stability measurements were performed at baseline, after 2, 4, 6 weeks and 3, 6 months using resonance frequency analysis (RFA) measurements (Osstell ISQ™, Osstell AB, Gothenburg, Sweden) expressed in ISQ units (Implant Stability Quotient). The patients were followed with clinical and radiographic examinations for 18 months. One implant failed after 4 weeks giving a cumulative survival rate of 98.0 % and the marginal bone loss amounted to 0.7 + 1.0 mm after 18 months. The mean insertion torque was 36 + 9.1 Ncm. The mean ISQ values indicated firm stability at baseline in both mesial-distal and buccal-lingual directions (i.e. above 65 ISQ). The ISQ curve presented a significant drop after 2–4 weeks where after the stability recovered progressively up to 6 months. It is concluded that upper lateral and lower incisors can be replaced with 3.25 mm implants according to an immediate loading protocol with high survival rate and minimal marginal bone loss. Moreover, the immediately loaded implants showed an initial dip of stability during the first 4 weeks followed by an an increase with time.

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