Evidence map›Paper›PMID 34448219›Full record

Trial reportJournal of clinical periodontology2021

Two short implants versus one short implant with a cantilever: 5-Year results of a randomized clinical trial.

Daniel S Thoma, Karin Wolleb, Roman Schellenberg, Franz-Josef Strauss, Christoph H F Hämmerle, Ronald E Jung

Registry-linked trialAbstract readRandomized Controlled Trial
In one paragraph

Trial report in Journal of clinical periodontology, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT01649531 (Two Implants Versus One Implant With a Cantilever - a Randomized Controlled Clinical Trial), which is not on this map. Cited by 9 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
9citing papers in PubMed, 1 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

NCT01649531 naunknown statusnot on this map

Two Implants Versus One Implant With a Cantilever - a Randomized Controlled Clinical Trial

TypeinterventionalSponsorUniversity of ZurichRan2012 to 2025Enrolled36ConditionsDental ImplantsArms1 Implant, 2 Implants
3 · Its place in the literature

Who cites it

9 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Pooled it
  2. Trial
  3. Trial
  4. Article
  5. Review
  6. Review
  7. Dimensions of Posterior Implant Restorations Related to Intra-Coronal Cantilever and Occlusal Forces: An In Vitro Study.Journal of esthetic and restorative dentistry : official publication of the American Academy of Esthetic Dentistry ... [et al.] · 2024
    Article
  8. Article
  9. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

6 authors.

Daniel S ThomaClinic of Reconstructive Dentistry, University of Zurich, Zurich, Switzerland.ORCID 0000-0002-1764-7447
Karin WollebPrivate Practice, Zurich, Switzerland.
Roman SchellenbergClinic of Reconstructive Dentistry, University of Zurich, Zurich, Switzerland.
Franz-Josef StraussClinic of Reconstructive Dentistry, University of Zurich, Zurich, Switzerland.ORCID 0000-0002-5832-7327
Christoph H F HämmerleClinic of Reconstructive Dentistry, University of Zurich, Zurich, Switzerland.ORCID 0000-0002-8280-7347
Ronald E JungClinic of Reconstructive Dentistry, University of Zurich, Zurich, Switzerland.ORCID 0000-0003-2055-1320

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

aimTo test whether or not the use of a short implant with a cantilever results in similar clinical and radiographic outcomes compared to two adjacent short implants with single tooth reconstructions. MATERIALS AND

methodsThirty-six patients with two adjacent missing teeth in the posterior region were randomly assigned to receive either a single 6-mm implant with a cantilever (ONE-C) or two 6-mm implants (TWO). Fixed reconstructions were inserted 3-6 months after implant placement and patients were re-examined up to 5 years (FU-5).

resultsA total of 26 patients were available for re-examination at FU-5. The survival rate amounted to 84.2% in ONE-C and to 80.4% in TWO (inter-group: p = .894). Technical complication rates amounted to 64.2% (ONE-C) and to 54.4% (TWO) (inter-group: p = 1.000). From baseline to FU-5, the median changes of the marginal bone levels were 0.13 mm in ONE-C and 0.05 mm in TWO (inter-group: p = .775). Probing depth, bleeding on probing, and plaque control record values showed no significant differences between the two treatment modalities (p > .05).

conclusionsShort implants with a cantilever render similar clinical and radiographic outcomes compared to two adjacent short implants at 5 years, however, they tend to fail at earlier time points suggesting an overload of the implants. Considering the modest survival rates, the clinical indication of either treatment option needs to be carefully evaluated. ClinicalTrials.gov (NCT01649531).

Indexed as

Dental ImplantsDental Prosthesis, Implant-SupportedDenture, Partial, FixedFollow-Up StudiesHumansDental Implantscantileverdental implantsimplant-supported crownsoverloadingshort implants

Identifiers

PMID34448219
PMCPMC9292666

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Registered trials

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.