Dental implant depth showdown: 4mm vs 6mm – which saves more bone?
NCT ID NCT07574710
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This study looked at whether placing a dental implant 4 millimeters or 6 millimeters below the gum line after a tooth extraction leads to better bone stability around the implant. Thirty-five healthy adults received one implant each, and researchers measured bone loss and implant stability over one year. The goal is to find the best depth to keep the bone healthy and the implant secure.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- dental implant placed at different depths (4 mm or 6 mm below the gum line)
- What this could lead to
- If one depth clearly preserves more bone, dentists may adopt that approach to improve long-term implant success and reduce bone loss.
- What could go wrong
- This is a small, single-center study with only 35 participants, so results may not apply to everyone. The one-year follow-up is too short to know long-term effects.
This is an AI summary of the original study and may miss details. Read our disclaimer.
Study facts
What this study's own registry entry says, in plain language.
- Phase
-
Not a phased trial
Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.
- Participants
-
35 people
The number who actually took part.
- Started
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Feb 2021
- Finished
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Sep 2024
- Lead sponsor
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Other sponsor
The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
-
18 years and older
- Sex
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Anyone
- Healthy volunteers
-
Not accepted
This study is not open to healthy volunteers. The entry requirements below say who it is open to.
Show the full entry requirements Hide the full entry requirements
Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria: 1\) age ≥ 18 years; (2) generally healthy individuals with no medical contraindications for implant surgery; (3) healthy soft tissue, indicated by bleeding on probing (BOP) \< 20% and Plaque Index (PI) \< 25%; (4) keratinized gingiva ≥ 2 mm, both buccally and lingually; (5) presence of molar or premolar in the upper or lower jaw; (6) implant primary stability ≥ 35 Ncm; (7) intact alveolar bone walls post-extraction; (8) one study implant per patient; and (9) signed informed consent with permission to utilize data for research purposes Exclusion Criteria: (1) smoking (≥ 10 cigarettes/day); (2) history of uncontrolled periodontitis; (3) uncontrolled diabetes or alcoholism; (4) medications known to impair healing; and (5) implant primary stability \< 35 Ncm
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As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
-
Lithuanian University of Health Sciences
Kaunas, Lithuania
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