Probing around dental implants before versus after crown removal to detect peri-implantitis
Official title: The Study on the Accuracy of Peri-implant Probing and Related Influencing Factors
Run by The Dental Hospital of Zhejiang University School of Medicine · NCT07004517 · Data updated 2026-11-12
This test will see if measuring pocket depth and bleeding around dental implants before versus after taking off the crown finds peri-implantitis more accurately in adults with restored implants.
Quick facts
| Study type | Observational |
|---|---|
| Ages | 18 Years to 90 Years |
| Sex | All |
| Enrollment | 83 (estimated) |
| Sponsor | The Dental Hospital of Zhejiang University School of Medicine Academic / other |
| Locations | 1 site (Hangzhou, Zhejiang) |
| Status | Recruiting |
| Started | January 11, 2024 |
| Main results expected | June 2025 |
| Study ends | August 2025 |
| Registry record updated | June 4, 2025 |
| Trial ID | NCT07004517 on ClinicalTrials.gov |
Is this trial a fit for you?
✓Likely a good fit
Adults over 18 whose implants are osseointegrated with a final restoration in place for at least one month and who need the restoration removed for any reason.
✕Probably not a fit
Patients who cannot have the prosthesis completely removed, those with serious systemic disease, severe intraoral infection, recent crown removal/re-restoration within one month, pregnancy/lactation, or who refuse participation may not receive benefit from this study.
A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.
What this trial studies
This is a diagnostic accuracy study comparing peri-implant probing depth (PPD) and bleeding on probing measured before prosthesis removal (PPD-1) and after crown removal (PPD-2). Investigators will record probing depths and bleeding, document prosthetic design features, and compare how well pre- and post-removal measurements identify peri-implantitis. The study will analyze factors that influence probing accuracy, such as prosthesis shape and access. It is a single-center observational study conducted at a dental hospital in Hangzhou, China.
Why it matters
Potential benefit: If successful, the results could help clinicians decide whether removing a prosthesis before probing improves diagnosis and leads to earlier, more accurate treatment of peri-implantitis.
How similar studies have gone: Some prior research has examined peri-implant probing and bleeding on probing, but direct diagnostic comparisons of measurements before versus after crown removal are limited, so this approach is relatively novel.
Who can join: the full rules
Show full inclusion / exclusion criteria
Inclusion Criteria: 1. Age greater than 18 years. 2. The implant has completed osseointegration and has undergone final restoration for at least one month. 3. The final restoration needs to be removed or retrieved for various reasons. Exclusion Criteria: * Patients with serious systemic diseases, severe intraoral infections, severe mental disorders, pregnancy/lactation in women, or other conditions that make oral treatment operations unsuitable. * History of crown removal or re-restoration within the past month prior to the visit. * The prosthesis has fallen off or is severely damaged and has lost its original form before the visit. * The prosthesis cannot be completely removed. * Refusal to participate in this study.
Where it's running
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The Affiliated Stomatology Hospital of Zhejiang University School of Medicine
Hangzhou, Zhejiang, China Recruiting
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How to take part
- Review the eligibility criteria above with your treating physician.
- Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
- Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.