Tiny implants, big smile: short teeth screws could replace bone grafts
NCT ID NCT02877433
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This study tested whether very short (4 mm) dental implants can securely hold a full set of fixed false teeth in the lower jaw. Fifty-three adults with no teeth in the lower jaw received either two or four short implants at the back, plus standard-length implants at the front. The goal was to see how well the implants stayed in place over time, offering a simpler option for people with thin jawbone.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- Roxolid short dental implant (4 mm length)
- What this could lead to
- If successful, this could offer a less invasive option for people with jawbone loss to get stable, fixed dentures without needing bone grafts.
- What could go wrong
- This is a small, completed study with only 53 participants. Short implants may not be as durable as standard-length implants, and individual results may vary.
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
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53 people
The number who actually took part.
- Started
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Aug 2016
- Finished
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Nov 2025
- Lead sponsor
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A company
The lead sponsor is a pharmaceutical, biotech, or medical-device company.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- 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: * Males and females with at least 18 years of age (including 18 years) * Subject must have voluntarily signed the informed consent, are willing and able to attend scheduled follow-up visits, and agree that the encoded data will be collected and analyzed * Fully edentulous (latest extraction in the mandible should be performed at least 12 weeks before implant placement) that can be restored with a complete denture * Atrophic jaw bone in the posterior area, sufficient bone height and width to permit insertion of four short implants, 4 mm in regions of the first molar and second premolar on both sides and two standard length implants in the canine region Exclusion Criteria: * Patients with inadequate bone volume and/or quality * Uncontrolled systemic disease that would interfere with dental implant therapy (e.g. uncontrolled diabetes) * Any contraindications for oral surgical procedures * History of local irradiation therapy in the head / neck area * Patients who smoke \>10 cigarettes per day or tobacco equivalents, chew tobacco or have ≥ 20 pack years * Medical conditions requiring chronic high dose steroid therapy or high dose anti-resorptive treatment * Subjects who have undergone administration of any investigational device within 30 days of enrollment in the study * Conditions or circumstances, in the opinion of the investigator, which would prevent completion of study participation or interfere with analysis of study results, such as history of non-compliance or unreliability * Cognitive impairment that would interfere with the ability to perform adequate oral hygiene (assessed by the Ottawa 3DY scale) * Patients with chronic pain * Patients with HIV and/ or Hepatitis infection * Severe bruxing or clenching habits * Patients with inadequate oral hygiene or unmotivated for adequate home care (Denture Plaque Index (DPI) ≥ 5) * Patients with drug or alcohol abuse * Patients with allergies or hypersensitivity to chemical ingredients of titanium-zirconium alloy * Major simultaneous augmentation procedures. Dehiscence of a vertical distance of more than 3 mm * A woman who is pregnant or planning to become pregnant at any point during the study duration Secondary Exclusion Criteria: * Patients with inadequate bone volume and/or quality
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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.
Contacts and locations
Locations
-
Queens University Belfast, School of Medecine, Dentistry and Biomedical Sciences
Belfast, BT9 7BL, United Kingdom
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University of Bern, Department of Reconstructive Dentistry and Gerodontology
Bern, 3010, Switzerland
More trials for these conditions
Other studies related to the condition(s) this trial covers.
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- New study finds best way to place dental implants in thin jawbones