15-Year study to see if dental implants keep upper dentures stable
NCT ID NCT07439237
First seen Jun 25, 2026 · Last updated Jun 27, 2026 · Updated 1 time
Summary
This study follows up with 116 people who got dental implants to support their upper dentures 15 years ago. Researchers will measure bone changes around the implants, check how many implants and dentures are still working, and ask patients how satisfied they are. The goal is to see if this treatment holds up well over the long term.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- What this could lead to
- If successful, this could confirm that 4 or 6 implants with a bar are a reliable long-term solution for upper dentures.
- What could go wrong
- This is an observational follow-up, not a new treatment test. Results may not apply to all patients, and some implants might fail over time.
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Study facts
What this study's own registry entry says, in plain language.
- Participants
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About 116 people
The number the study aims to enrol. It can still change while the study runs.
- Expected to start
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May 2026
An estimate. Start dates often move.
- Expected to finish
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Nov 2026
An estimate. End dates often move.
- 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.
Who is studied
Patients who were treated 15 years ago with dental implants and an overdenture in the maxilla because of problems with retention and stability with their maxillary conventional denture.
- Ages
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18 years and older
- Sex
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Anyone
- Healthy volunteers
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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: * Fully edentulous patients or patients with an overdenture in the mandible, who were referred to the Department of Oral and Maxillofacial Surgery (University Medical Center Groningen, the Netherlands) 15 years ago, because they suffered from a lack of retention and stability of the upper denture; At the time of treatment: * Edentulous in the maxilla for at least one year; * Sufficient bone volume in height in the anterior or posterior region of the maxilla to place the implants; * The patient was 18 years or older; * Sufficient interocclusal space for placement of an overdenture with attachment system; * The patient was capable of understanding and giving informed consent. Exclusion criteria at the time of treatment: * Patients with American Society of Anesthesiologists score (ASA score) ≥ III; * Patients who were smoking; * Patients with a history of radiotherapy in the head and neck region; * Patients with a history of pre-prosthetic surgery or previous implant placement in the maxilla. Exclusion Criteria: None
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
How to take part
Only the study team decides who joins. These are the ways to reach them.
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The official record
ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.
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A doctor treating you
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