An interventional study of Metallic UNC-15 periodontal probe and Plastic UNC-15 periodontal probe in Peri-implant Health and Peri-implant Mucositis, sponsored by University of Barcelona. Recruiting at 1 site in Spain. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2026-06-24.
Sponsored by University of Barcelona · Not applicable, Interventional, and Diagnostic
Evaluate whether the type of probe (plastic vs. metallic) modifies the accuracy of peri-implant probing in single-unit implants, by comparing the probing depth recorded with the prosthesis in place versus without the prosthesis (ΔPD, mm). Secondarily, explore the influence of prosthetic design and implant position on probing values and on other clinical and radiographic parameters.
Randomized clinical trial with two parallel groups. Eligible patients will be randomized (1:1 ratio) to one of two parallel treatment groups:
Group 1 (Metal probe): Peri-implant probing performed with a UNC-15 metallic periodontal probe (HuFriedy PCPUNC156).
Group 2 (Plastic probe): Peri-implant probing performed with a UNC-15 plastic periodontal probe (HuFriedy PCVO12PT).
Primary objective:
To evaluate whether the type of probe (plastic vs metallic) modifies the accuracy of peri-implant probing in single-unit implants, by comparing the probing depth recorded with the prosthesis in place versus without the prosthesis (ΔPS, mm).
Secondary objectives:
To explore the influence of prosthetic design (e.g., emergence profile, crown contour) and implant position on probing depth values and other clinical/radiographic parameters.
To evaluate patient-reported discomfort during peri-implant probing, recorded using a 100-mm visual analogue scale (VAS).
The study was designed in accordance with the international consensus on Implant Dentistry Core Outcome Set and Measurement (ID-COSM), published in the Journal of Clinical Periodontology in 2023. The protocol includes all applicable mandatory outcome domains recommended by this consensus for implant dentistry clinical trials.
265 studies on the registry are indexed under Mucositis; 34 are open to participants now.
This study's planned enrollment of 64 is above the median of 45 across 215 interventional studies indexed under Mucositis.
Browse Mucositis studies →University of Barcelona is the lead sponsor of 98 studies on the registry; 29 are open to participants now.
Counted across the registry records on this site, refreshed daily.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Exclusion Criteria:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Metallic UNC-15 periodontal probe (HuFriedy PCPUNC156)
Device: Metallic UNC-15 periodontal probe
Plastic UNC-15 periodontal probe (HuFriedy PCVO12PT)
Device: Plastic UNC-15 periodontal probe
Probing performed at six sites per implant with the prosthesis in place and after prosthesis removal, under standardized force (0.20 N).
Probing performed at six sites per implant with the prosthesis in place and after prosthesis removal, under standardized force (0.20 N).
Difference in probing depth with vs. without prosthesis (ΔPS, mm)
Difference in peri-implant probing depth (ΔPS) between plastic and metallic probes, measured by a single calibrated examiner at six sites per implant using a standardized probing force (20-25 g). Unit of Measure: millimeters (mm) This primary outcome was defined following the mandatory outcome domains recommended by the international consensus on Implant Dentistry Core Outcome Set and Measurement (ID-COSM), published in the Journal of Clinical Periodontology in 2023.
Time frame: Baseline (single clinical visit)
Patient Discomfort During Probing (VAS, 0-100 mm)
Pain/discomfort reported by the patient immediately after peri-implant probing. Unit of Measure: millimeters (0-100 mm VAS) , where 0 is the minimum pain value and 100 is the maximum pain value.
Time frame: Immediately after probing, at the study visit
Probing Depth (PPD, mm)
Depth of peri-implant sulcus measured at six sites per implant using standardized probing force (20-25 g). Unit of Measure: millimeters (mm)
Time frame: Baseline (single clinical visit)
Width of Keratinized Mucosa (KM, mm)
Distance from the mucosal margin to the mucogingival junction at the buccal aspect. Unit of Measure: millimeters (mm)
Time frame: Baseline (single clinical visit)
Mucosal Margin Position (DIM, mm)
Distance from the mucosal margin to a fixed reference point. Unit of Measure: millimeters (mm)
Time frame: Baseline (single clinical visit)
Clinical Attachment Level (CAL, mm)
Calculated as the sum of PPD and DIM. Unit of Measure: millimeters (mm)
Time frame: Baseline (single clinical visit)
Modified Plaque Index (0-3 scale)
Plaque accumulation assessed according to the Modified Plaque Index (Mombelli et al., 1987). Plaque deposits around each implant will be evaluated using the Modified Plaque Index (Mombelli et al., 1987), which scores the presence of plaque or calculus on a 0-3 scale: 0 = no plaque detected 1. = plaque detectable only by running a probe across the marginal surface 2. = plaque visible to the naked eye 3. = abundance of soft matter or presence of calculus Unit of Measure: Units on a scale (0-3)
Time frame: Baseline (single clinical visit)
Bleeding and/or Suppuration on Probing (presence/absence)
Presence or absence of bleeding and/or suppuration at each implant following the 2017 World Workshop criteria. Unit of Measure: Yes/No
Time frame: Baseline (single clinical visit)
Implant Type (categorical)
Design/type of implant placed. Unit of Measure: Categorical
Time frame: Baseline (single clinical visit)
Implant Position (categorical)
Specifying whether the implant was placed at bone level or tissue level Unit of Measure: Categorical .
Time frame: Baseline (single clinical visit)
Implant-Prosthetic Connection Type (categorical)
The type of implant-prosthetic connection will be recorded, categorized as internal or external. Unit of Measure: Categorical
Time frame: Baseline (single clinical visit)
Emergence Angle (EA, °)
The emergence angle (EA) will be measured on standardized periapical radiographs as the angle formed between: The longitudinal axis of the implant, traced as a straight line through the center of the implant body; and a tangent line to the outer surface of the prosthetic restoration at the point where the crown emerges from the implant platform. Unit of Measure: degrees (°)
Time frame: Baseline (single clinical visit)
Emergence Profile (EP)
The emergence profile was recorded as a qualitative variable describing the contour of the restoration. Its classification was determined based on the emergence angle (EA): it was considered concave when EA \< 30°, and convex when EA ≥ 30°. Unit of Measure: Categorical
Time frame: Baseline (single clinical visit)
Connection-Contour Distance (mm)
Linear distance between implant-abutment connection and contour of the restoration. Unit of Measure: millimeters (mm)
Time frame: Baseline (single clinical visit)
Prosthesis Material (type)
Material used for the prosthesis (e.g. zirconia or metal-ceramic). Unit of Measure: Categorical (material type)
Time frame: Baseline (single clinical visit)
Titanium Height (mm)
This variable applies only to implants restored with zirconia crowns. The vertical height (mm) of the titanium base (Ti-base) supporting the zirconia restoration will be measured. Unit of Measure: millimeters (mm)
Time frame: Baseline (single clinical visit)
Patient Satisfaction With the Procedure (VAS, 0-100 mm)
Overall satisfaction with the probing experience. Unit of Measure: millimeters (0-100 mm VAS) , where 0 is the minimum satisfaction value and 100 is the maximum satisfaction value.
Time frame: Immediately after probing, at the study visit
Perceived Difficulty of Oral Hygiene (VAS, 0-100 mm)
Self-reported difficulty performing peri-implant hygiene. Unit of Measure: millimeters (0-100 mm VAS) , where 0 is the minimum difficulty performing peri-implant hygiene value and 100 is the maximum value.
Time frame: Immediately after probing, at the study visit
Presence of Adverse Events (yes/no)
Presence/absence of pain, bleeding or excessive discomfort during or after probing. Unit of Measure: Yes/No
Time frame: Immediately after probing, at the study visit
Peri-implant Diagnosis (health vs mucositis)
Diagnosis established based on combined PPD and BOP/SUP criteria following the 2017 World Workshop. Unit of Measure: Categorical (Health / Mucositis)
Time frame: Baseline (single clinical visit)
PDFs hosted by the registry, ClinicalTrials.gov.
Plan to share: No
Started Jan 2026 (actual). Primary completion is estimated for Oct 2026, 9 months after the start.
Of 67 non-industry interventional studies with no phase under Mucositis, half reached primary completion within 12 months of starting (the median), counting those still running; a quarter within 6 and three quarters within 26. This study's planned 9 months is below that.
Counting every sponsor, half of 70 studies reached it within 12 months; a quarter within 6 and three quarters within 26.
How these figures are worked out, and which studies are left out of them.
Eligibility is decided by the study team. Share this record with your doctor or contact the team directly.
Contact study teamGet an email when the registry record changes — status, dates, results — or when someone posts here.
Sign in to followQuestions and observations about this study, from anyone following it. Not medical advice, and not a channel to the study team — their contact details are on the registry record.
Sign in to join the discussion. Reading takes no account; posting does. You choose a display name, and a pseudonym is the default.
Nothing here yet. If you are running this trial, taking part in it, or weighing whether to, this is the place to say so.
University of Barcelona