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International Journal of Implant Dentistry
Published in: International Journal of Implant Dentistry 1/2022

Open Access 01-12-2022 | Bleeding on Probing | Research

Impact of machined versus structured implant shoulder designs on crestal bone level changes: a randomized, controlled, multicenter study

Authors: Daniel Rothamel, Maria Heinz, Daniel Ferrari, Alfons Eissing, Henrik Holtmann, Lara Schorn, Tim Fienitz

Published in: International Journal of Implant Dentistry | Issue 1/2022

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Abstract

Purpose

The collar region of an implant is its connection to the oral cavity. A balance between osseointegration on one hand and the absence of plaque accumulation on the other hand is necessary for successful implantation. It is yet to be determined which implant collar design, polished or rough, is best to stabilize the crestal bone level, avoiding peri-implantitis and subsequent risk of implant loss. The aim of this study was to investigate the influence of the architecture of the collar region on marginal bone and soft tissue response.

Methods

This prospective, randomized, clinically controlled multicenter study included 58 patients undergoing dental implant treatment using a pair of dental implants with either machined or rough-surfaced shoulder regions. Patients were clinically and radiologically examined for bone level height and signs of inflammation after 6, 12 and 24 months.

Results

No implant was lost within the 2 years of follow-up (100% survival rate). No significant differences on crestal bone loss (machined neck: 0.61 mm ± 0.28 mm, rough neck 0.58 mm ± 0.24 mm) and on soft tissue response (probing depth 3–6 mm with bleeding on probing 7.6% in machined-neck implants and in 8.3% in rough neck implants) were observed between implants with machined and roughened neck after 2 years.

Conclusions

Machined and roughened neck implants achieved equally good results concerning peri-implant bone loss, the rate of peri-implantitis and implant survival rate/hard and soft tissue integration. None of the two collar designs showed a clear advantage in peri-implant reaction.
Trial registration German Clinical Trials Register, DKRS00029033. Registered 09 May 2022—Retrospectively registered, http://​www.​dkrs.​de
Appendix
Available only for authorised users
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Metadata
Title
Impact of machined versus structured implant shoulder designs on crestal bone level changes: a randomized, controlled, multicenter study
Authors
Daniel Rothamel
Maria Heinz
Daniel Ferrari
Alfons Eissing
Henrik Holtmann
Lara Schorn
Tim Fienitz
Publication date
01-12-2022
Publisher
Springer Berlin Heidelberg
Published in
International Journal of Implant Dentistry / Issue 1/2022
Electronic ISSN: 2198-4034
DOI
https://doi.org/10.1186/s40729-022-00432-4

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