Evaluating oral hygiene and microbial load after restoring primary molars with different crowns

Evaluation of Oral Hygiene Status in Correlation With Microbial Load in the Oral Cavity Following Restorations of Primary Molars Using Stainless Steel and Bioflex Crowns (Clinical Randomized Trial)

Observational Al-Azhar University · NCT06767670

This study is testing how different types of crowns for kids' back teeth affect their oral hygiene and the amount of germs in their mouths.

Quick facts

Study typeObservational
Enrollment40 (estimated)
Ages4 Years to 8 Years
SexAll
SponsorAl-Azhar University Academic / other
Locations2 sites (Cairo, Nasr City and 1 other locations)
Trial IDNCT06767670 on ClinicalTrials.gov

What this trial studies

This observational study investigates the relationship between oral hygiene and microbial load in children aged 4 to 8 years who have undergone restoration of primary molars using stainless steel and bioflex crowns. The study employs a split-mouth technique, comparing the effects of both types of crowns on gingival health and the presence of microorganisms in the oral cavity. Participants will be assessed for their oral hygiene status following the restoration procedure to determine any differences in microbial load associated with the crown type used.

Who should consider this trial

Good fit: Ideal candidates for this study are children aged 4 to 8 years who require full coverage restoration of primary molars and have undergone pulp therapy.

Not a fit: Patients with systemic diseases, physical disabilities, or those with non-restorable teeth will not benefit from this study.

Why it matters

Potential benefit: If successful, this study could provide insights into improving oral health outcomes in children with restored primary molars.

How similar studies have performed: While similar studies have explored oral hygiene and microbial load, this specific comparison of crown types in a pediatric population is relatively novel.

Eligibility criteria

Show full inclusion / exclusion criteria
Inclusion Criteria:

* Participants aged between 4 and 8 years.
* Pulp therapy treated primary molars on the contralateral side, requiring a full coverage restoration (split-mouth technique).
* No history of any antibiotic consumption 2 weeks before the procedure.
* No history of fluoride application 2 weeks before the procedure.

Exclusion Criteria:

* Special children with physical disabilities or emotional disturbances.
* Children are diagnosed with systemic diseases.
* Grossly destructed teeth with non-restorable crown structure.
* Primary teeth with shedding or pathological tooth mobility.

Where this trial is running

Cairo, Nasr City and 1 other locations

Study contacts

How to participate

  1. Review the eligibility criteria above with your treating physician.
  2. Visit the official trial page on ClinicalTrials.gov for the most current contact information and recruitment status.
  3. Contact the listed study coordinator or principal investigator to request pre-screening. Pre-screening is free and never obligates you to enroll.
Conditions Carious LesionReady-made Crownsprimary crowns,oral health
Last reviewed 2026-06-13 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.