Trial reportJournal of clinical periodontology2025
Long-Term Impact of 1-mm Versus 3-mm Definitive Abutments on Marginal Bone Loss and Peri-Implant Disease: A 7-Year Randomised Clinical Trial.
Trial report in Journal of clinical periodontology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
What it found
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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.
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.
Who cites it
2 citing papers in PubMed.
- Long-Term Impact of 1-mm Versus 3-mm Definitive Abutments on Marginal Bone Loss and Peri-Implant Disease: A 7-Year Randomised Clinical Trial.Journal of clinical periodontology · 2025Trial
- Abutment height matters - but not always: the role of prosthetic retention type in peri-implant marginal bone loss.The journal of advanced prosthodontics · 2026Review
Corrections and comments
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Authors and funding
6 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
aimTo evaluate bone level changes in implants with 1-mm- or 3-mm-high abutments over a 7-year period and to investigate the role of abutment height upon peri-implant status. MATERIALS AND
methodsTwo-piece implants were placed 1.5 mm subcrestally with either 1-mm (control) or 3-mm (test) high definitive abutments. Marginal bone level change from the first to seventh year was the primary outcome. Peri-implant status and other patient and peri-implant clinical variables (smoking, peri-implant maintenance therapy compliance, interproximal hygiene, vertical soft tissue thickness and keratinised mucosa width) were also assessed.
resultsAfter 7 years, 37 subjects (63 implants) were analysed: 17 subjects with 32 implants in the 1-mm abutment group, and 20 subjects with 31 implants in the 3-mm abutment group. Significant differences in marginal bone level changes were observed at 7 years. The 3-mm abutment group showed smaller changes compared to the 1-mm abutment group at mesial sites (-0.27 ± 1.32 mm vs. -0.42 ± 0.50 mm, respectively) and distal sites (-0.33 ± 1.39 mm vs. -0.35 ± 0.38 mm), with both differences being statistically significant (p < 0.001). In the control group, 18 implants (54.6%) presented peri-implant mucositis and 6 implants (18.2%) showed peri-implantitis. In the test group, 23 implants (74.2%) presented peri-implant mucositis and 1 implant (3.2%) showed peri-implantitis. No statistically significant differences were found (p = 0.158).
conclusionsSubcrestally inserted implants with 3-mm definitive abutments experienced minimal bone loss over long-term follow-up compared to 1-mm abutments. However, since the differences were not statistically significant, no conclusions could be drawn on the protective effect against peri-implantitis.
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