Dental implant crown attachment method may influence gum inflammation
NCT ID NCT04707716
First seen Jun 25, 2026 · Last updated Jun 27, 2026 · Updated 1 time
Summary
This completed study with 39 participants looked at three ways to attach a single crown to a dental implant: screw retention, cementation, and a friction-only system (Acuris). The goal was to see if the attachment method affects gum inflammation (measured by a biomarker called MMP-8) and bone loss around the implant during the first year. Researchers also checked gum health, patient satisfaction, and any technical problems.
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Study facts
What this study's own registry entry says, in plain language.
- Phase
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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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39 people
The number who actually took part.
- Started
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Mar 2021
- Finished
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Nov 2025
- 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
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18 to 99 years
- Sex
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Anyone
- Healthy volunteers
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Accepted
You do not need to have the condition being studied to take part.
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: * capability of giving an informed consent * good health as defined by the subjects medical history (no contraindications as described in the exclusion criteria below) * age 18 to 99 years * Good periodontal status: BOP \< 20%, PI \< 30%, no PD \> 4mm * No heavy smokers (\< 10 cigarettes/day) * at least 1 missing tooth in the premolar and molar region (with at least a mesial neighboring tooth/implant showing adequate hard- and soft tissue situation without the need of crestal hard- or soft tissue augmentation) either in the maxilla or in the mandible requiring implant therapy for reconstruction, requiring sinus floor augmentation or not. Exclusion Criteria * Insufficient bone volume for implant placement requiring GBR (guided bone regeneration) procedure in crestal area. * Heavy Smokers (\>10 cigarettes/day) * Medication with a contraindication for implant therapy (especially antiresorptive therapy, ongoing or recently completed local radiotherapy, systematic diseases, ongoing immunosuppressive therapy, functional disorders like Bruxism). * Skeletal immaturity. * Any active malignancy or ongoing treatment for malignancy. * An active infection (e.g. caries, gingivitis, periodontitis) at or in the neighboring area of the operative site. * Pregnancy * unable or unwilling to return for follow-up visits for a period of at least 16 months
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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
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Medical University of Graz, Department of Dental Medicine and Oral Health, Division of Oral Surgery and Orthodontics
Graz, 8010, Austria