Effect of Crown Material on Gingival Microbial Colonization

NCT07083102 | Not Yet Recruiting

• 1 other identifier: SOD/ERB/2025/77
• Study Type: interventional
• Target: 30
• Locations: 1 country
• Sites: 1

Brief Summary

• Prior approval from SOD ethical committee has been received.
• All patients presenting to the General OPD of School of Dentistry, Islamabad will be screened. Those patients who fulfill the criteria will be referred to the Prosthodontics department.
• The patients will undergo detailed history and oral examination after informed consent (Annexure-A). Patients will undergo radiographic investigation and based on this information they will be selected for the study according to the exclusion and inclusion criteria.
• Eligible participants will be randomly assigned to one of the following groups using a computer-generated sequence with allocation concealment via sealed opaque envelopes:
• Group A: Control group
• Group B: Full-coverage PFM crowns
• Group C: Full-coverage Zirconia crowns
• Baseline gingival samples will be collected with the help of sterile swab from the target tooth region prior to prosthesis placement and at the follow-up visits i.e. 1, and 3 months; both for experimental groups and control group.
• Microbial analysis will be conducted through culture techniques to quantify CFUs and identify species.
• A summary of the micro-organisms, their incubation media, temperature and time is presented in the following table: Table 1: Summary of the micro-organisms, their incubation media, temperature and time Micro-organism Growth Media Temperature Incubation time Candida albicans Saboraud Agar 370C 24-48 hours Streptococcus mutans BHI broth 370C 24-48 hours Staphylococcus aureus BHI broth 370C 24-48 hours Porphyromonas gingivalis BHI broth 370C 18-24 hours
• Alongside, the same sample from sterile swabs will be smeared by fixating it on a microscopic slide and then Candida albicans will be stained by Periodic Acid Schiff technique, and the bacterial species using Gram staining.
• All participants will receive standardized verbal and written instructions oral hygiene instructions to control for hygiene-related variation

Conditions

Microbial Colonization; Missing Teeth

Outcome Measures

Primary Outcomes (1)

• Quantitative change in gingival microbial count (CFU/ml) for each microorganism over time.

  3 months

Secondary Outcomes (1)

• Comparative analysis of microbial colonization trends between PFM and Zirconia crown groups

  3 months

Study Arms (3)

Group A: Control group

NO INTERVENTION

Same tooth on the contra lateral side

Group B: Full-coverage PFM crowns

EXPERIMENTAL

Microbial analysis will be carried out around the PFM crowns

Other: Experimental

Group C: Full-coverage Zirconia crowns

EXPERIMENTAL

Microbial analysis will be carried out around the Full-coverage Zirconia crowns

Other: Experimental

Interventions

Experimental OTHER

* Eligible participants will be randomly assigned to one of the following groups using a computer-generated sequence with allocation concealment via sealed opaque envelopes: * Group A: Control group * Group B: Full-coverage PFM crowns * Group C: Full-coverage Zirconia crowns * Baseline gingival samples will be collected with the help of sterile swab from the target tooth region prior to prosthesis placement and at the follow-up visits i.e. 1, and 3 months; both for experimental groups and control group. * Microbial analysis will be conducted through culture techniques to quantify CFUs and identify species. * Alongside, the same sample from sterile swabs will be smeared by fixating it on a microscopic slide and then Candida albicans will be stained by Periodic Acid Schiff technique, and the bacterial species using Gram staining.

Group B: Full-coverage PFM crowns; Group C: Full-coverage Zirconia crowns

Eligibility Criteria

• Age: 20 Years - 50 Years
• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64)

You may qualify if:

• Age between 20 to 50 years.
• Both male and female patients will be selected.
• Good oral hygiene (Defined as a plaque index score ≤ 1 across all assessed surfaces and no visible calculus deposits)
• Dentate patients require fixed prostheses for the first time on mandibular pre-molars and molars.
• Patient with no history of any dental and bony pathosis (cysts, cancerous lesion).

You may not qualify if:

• Untreated periodontal diseases
• Xerostomia
• Pregnancy, lactation
• Smokers
• Individuals with systemic conditions like diabetes and immunosuppressive diseases

Sponsors & Collaborators

• Pakistan Institute of Medical Sciences: lead

Study Sites (1)

School of Dentistry, SZAMBU

Islamabad, Federal, 44000, Pakistan

Location

MeSH Terms

Conditions

Communicable Diseases; Anodontia

Condition Hierarchy (Ancestors)

Infections; Disease Attributes; Pathologic Processes; Pathological Conditions, Signs and Symptoms; Tooth Abnormalities; Stomatognathic System Abnormalities; Stomatognathic Diseases; Tooth Diseases; Congenital Abnormalities; Congenital, Hereditary, and Neonatal Diseases and Abnormalities

Central Study Contacts

Fatima Nasir Cheema, BDS, Post graduate Resident

CONTACT

+923227965188; fatimanasir969@gmail.com

Maria Shakoor Abbasi, BDS, FCPS

CONTACT

+923333615061; maria_shakoor@hotmail.com

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: DOUBLE
• Who Masked: INVESTIGATOR, OUTCOMES ASSESSOR
• Masking Details: • Eligible participants will be randomly assigned to one of the following groups using a computer-generated sequence with allocation concealment via sealed opaque envelopes: * Group A: Control group * Group B: Full-coverage PFM crowns * Group C: Full-coverage Zirconia crowns * Single blinding: Due to the nature of the dental procedure and patient involvement in treatment planning, participants will be informed of the crown material being used (PFM or zirconia). However, they will not be informed of the specific purpose of the study (partial blinding). * The microbiologist conducting sample analysis will be fully blinded to participant group allocation. Additionally, the data analyst will be blinded during statistical evaluation as well.
• Purpose: TREATMENT
• Intervention Model: PARALLEL
• Sponsor Type: OTHER GOV
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Effect of Crown Material on Gingival Microbial Colonization: A Randomized Clinical Trial

Study Record Dates

• First Submitted: July 16, 2025
• First Posted: July 24, 2025
• Study Start: August 15, 2025
• Primary Completion: December 15, 2025
• Study Completion: December 15, 2025
• Last Updated: July 24, 2025

Record last verified: 2025-06

Locations

PA (1)