An observational study in Compliance, Periodontitis and Periodontal Therapy, sponsored by University of Zagreb. Completed at 1 site in Croatia. Per ClinicalTrials.gov, last updated 2026-10-08.
Sponsored by University of Zagreb · Observational
This cross-sectional observational study compared the clinical periodontal status and oral health-related quality of life between patients who continued regular supportive periodontal therapy (SPT) visits during the COVID-19 pandemic and those who experienced a prolonged interruption of SPT. The study included patients who had completed active periodontal therapy and were enrolled in an SPT program, divided into a non-compliant group with prolonged SPT interruption and a compliant group with regular SPT. Clinical periodontal parameters including plaque index, bleeding on probing, probing depth, gingival recession, clinical attachment level, and distribution of probing depths were assessed. Oral health-related quality of life was evaluated using the OHIP-14 questionnaire.
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This study's enrollment of 60 is below the median of 200 across 31 observational studies indexed under Patient Compliance.
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Patients who had completed active periodontal therapy and were enrolled in a supportive periodontal therapy (SPT) program, divided into those who continued regular SPT visits during the COVID-19 pandemic and those who experienced a prolonged interruption of SPT.
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:
Other: Prolonged interruption of supportive periodontal therapy (≥24 months)
Observational comparison of patients who experienced a prolonged interruption of supportive periodontal therapy during the COVID-19 pandemic versus those who continued regular SPT visits. No treatment is assigned by the investigator; participants are observed based on their existing SPT compliance status.
PPD
Periodontal probing depth - the distance in millimeters from the gingival margin to the base of the periodontal pocket. It is measured using a standard periodontal probe at 6 sites per tooth. Higher values indicate deeper periodontal pockets (worse periodontal status), while lower values indicate shallower pockets (better periodontal status).
Time frame: Baseline (single assessment)
OHIP-14
OHIP-14 is a 14-item questionnaire that assesses the impact of oral health on oral health-related quality of life. Each item is scored on a Likert scale from 0 to 4 (0 = never, 1 = hardly ever, 2 = occasionally, 3 = fairly often, 4 = very often). The total score ranges from 0 to 56. Higher scores indicate worse oral health-related quality of life, while lower scores indicate better oral health-related quality of life.
Time frame: Baseline (single assessment)
RE
Gingival recession is the distance in millimeters from the cementoenamel junction to the gingival margin. It is measured using a standard periodontal probe. Higher values indicate more pronounced gingival recession (worse condition), while lower values or a value of 0 indicate a normal position of the gingival margin.
Time frame: Baseline (single assessment)
CAL
Clinical attachment level is the sum of probing depth and gingival recession at a given tooth site, expressed in millimeters. It represents the distance from the cementoenamel junction to the base of the periodontal pocket. Higher values indicate greater clinical attachment loss (worse condition), while lower values indicate a more preserved periodontal supporting structures.
Time frame: Baseline (single assessment)
FMPS
Full-mouth plaque score - plaque accumulation will be assessing the presence or absence of supragingival plaque on six surfaces of each tooth. The results will be expressed as the percentage of plaque-positive surfaces relative to the total number of examined surfaces. FMPS is calculated by dividing the number of sites with plaque by the total number of examined sites and multiplying by 100. Scores range from 0% to 100%. Higher percentages indicate greater plaque accumulation (worse condition), while lower percentages indicate better oral hygiene.
Time frame: Baseline (single assessment)
FMBS
Full-mouth bleeding score - gingival inflammation will be assessed recorded dichotomously (presence/absence of bleeding) following gentle probing of the gingival sulcus at standardized sites. The outcome will be expressed as the percentage of bleeding-positive sites, reflecting the degree of gingival inflammatory response. FMBS is calculated by dividing the number of bleeding sites by the total number of examined sites and multiplying by 100. Scores range from 0% to 100%. Higher percentages indicate greater gingival inflammation (worse condition), while lower percentages indicate healthier gingival tissue.
Time frame: Baseline (single assessment)
Plan to share: No
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From the registry record's own update history. This site started tracking changes on Sep 25, 2026; for anything earlier, see the record history on ClinicalTrials.gov ↗
This study is completed, as verified in Oct 2026. You cannot join it, but the record below documents what was studied.
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University of Zagreb