The Study on the Accuracy of Peri-implant Probing and Related Influencing Factors

Recruiting

• Conditions: Peri-Implantitis; Diagnosis

• Registration Number: NCT07004517
• Lead Sponsor: The Dental Hospital of Zhejiang University School of Medicine

Brief Summary

The aim of the diagnostic accuracy study was to compare the diagnostic accuracy of probing depth before (PPD-1) and following (PPD-2) the removal of prothesis in identifying the presence of peri-implantitis and assess the factors influencing peri-implant probing.

Detailed Description

This study aims to design a diagnostic accuracy study to compare the peri-implant probing depth and bleeding on probing before and after crown removal. It will explore the impact of prosthetic design on the accuracy of peri-implant probing and its diagnostic accuracy, and provide clinical recommendations on whether the prosthesis should be removed prior to peri-implant probing.

Study Timeline

• Study Start: 2024-01-11
• Status Verified: 2025-05
• Study First Submitted: 2025-05-13
• Study First Submitted QC: 2025-05-26
• Last Update Submitted: 2025-05-26
• Primary Completion: 2025-06
• Study First Posted: 2025-06-04
• Last Update Posted: 2025-06-04
• Study Completion: 2025-08

Recruitment & Eligibility

• Status: RECRUITING
• Sex: All
• Target Recruitment: 83

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.

Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
probing depth	On the day of enrollment	The PPDs at 6 site were measured as the distance from the mucosal margin to the base of the peri-implant pocket.

Secondary Outcome Measures

Name	Time	Method
bleeding on probing	On the day of enrollment	Bleeding sites after gentle probing within 15s were recorded as BOP scores. A positive score (1 point) was recorded if bleeding was observed during either of probing assessment by two researchers.
Emergency angel	The X-ray examination will be completed on the day of enrollment	The emergence angle was calculated as the angle between the implant long axis and a line tangent to the restoration. The measurements were repeated twice, and the mean was calculated for each mesial and distal interproximal surface.
Emergency profile	The X-ray examination will be completed on the day of enrollment	Emergence profile was categorized as either concave, straight or convex.

Trial Locations

Locations (1)

The Affiliated Stomatology Hospital of Zhejiang University School of Medicine; 🇨🇳 Hangzhou, Zhejiang, China