# Evaluation of the 1999 and 2018 Periodontal Disease Classifications: a Retrospective Study

> **NCT04815772** · — · COMPLETED · sponsor: **Okan University** · enrollment: 202 (actual)

## Conditions studied

- Diabetes Mellitus
- Smoking
- Periodontal Diseases

## Interventions

_None listed._

## Key facts

- **NCT ID:** NCT04815772
- **Lead sponsor:** Okan University
- **Sponsor class:** OTHER
- **Phase:** —
- **Study type:** OBSERVATIONAL
- **Status:** COMPLETED
- **Start date:** 2020-11-01
- **Primary completion:** 2021-01-30
- **Final completion:** 2021-03-01
- **Target enrollment:** 202 (ACTUAL)
- **Last updated:** 2021-03-25


## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT04815772

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT04815772, "Evaluation of the 1999 and 2018 Periodontal Disease Classifications: a Retrospective Study". Retrieved via AI Analytics 2026-06-01 from https://api.ai-analytics.org/clinical/NCT04815772. Licensed CC0.

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*[Clinical trials dataset](/datasets/clinical-trials) · CC0 1.0*