Evidence map›Paper›PMID 34467461›Full record

ArticleInternational journal of implant dentistry2021

Effect of crown-to-implant ratio and crown height space on marginal bone stress: a finite element analysis.

José Joaquim da Rocha Ferreira, Luís Filipe Meira Machado, José Manuel Oliveira, João Carlos Tomás Ramos

Abstract read
In one paragraph

Article in International journal of implant dentistry, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 14 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
14citing 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.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

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

  1. Clinical efficacy of extra-short implant (4 mm) placed in posterior areas: a Meta-analysis.Hua xi kou qiang yi xue za zhi = Huaxi kouqiang yixue zazhi = West China journal of stomatology · 2023
    Pooled it
  2. Article
  3. Article
  4. Can an increase in abutment screw length enable biomechanical advantages for implants with increased crown height space?Journal of prosthodontics : official journal of the American College of Prosthodontists · 2026
    Article
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  9. Review
  10. Stress Distribution on Short Implants with Varying Crown Heights - AnJournal of pharmacy & bioallied sciences · 2024
    Article
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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

4 authors.

José Joaquim da Rocha FerreiraInstitute of Science and Innovation in Mechanical and Industrial Engineering (INEGI), Oporto, Portugal. jose.j.r.ferreira.299@gmail.com.ORCID 0000-0002-5217-0373
Luís Filipe Meira MachadoCentre of Mathematics, University of Minho, Campus de Azurém, 4800-058, Guimarães, Portugal.
José Manuel OliveiraInstitute of Science and Innovation in Mechanical and Industrial Engineering (INEGI), Oporto, Portugal.
João Carlos Tomás RamosDepartment of Dentistry, Stomatology and Maxillofacial surgery, Faculty of Medicine, University of Coimbra, Av. Bissaya Barreto-Blocos de Celas, 3000-075, Coimbra, Portugal.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundCrown-to-implant ratio and crown height space, associated with the use of short implants, have been related with marginal bone loss. However, it is unclear which of the two entities would play the most important role on the bone remodelling process. Using a finite element analysis, the present work aims to help clarifying how those two factors contribute for the stress generation at the marginal bone level. A numerical model (reference model), with a crown-to-implant ratio of 4, was double validated and submitted to a numerical calculation. Then, it was modified in two different ways: (a) by decreasing the prosthetic height obtaining crown-to-implant ratios of 3, 2.5 and 2 and (b) by increasing the implants length obtaining a crown-to-implant ratio of 2.08. The new models were also submitted to numerical calculations.

resultsThe reference model showed a marginal bone stress of 96.9 MPa. The increase in the implants' length did not show statistically significant differences in the marginal bone stress (p-value = 0.2364). The decrease in the prosthetic height was accompanied with a statistically significant decrease in the marginal bone stresses (p-value = 2.2e- 16).

conclusionsThe results represent a paradigm change as the crown height space appears to be more responsible for marginal bone stress than the high crown-to-implant ratios or the implants' length. New prosthetic designs should be attempted to decrease the stress generated at the marginal bone level.

Indexed as

CrownsFinite Element AnalysisStress, Mechanical

Identifiers

PMID34467461
PMCPMC8408299

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Registered trials

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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.