Comparing two cementing methods for full-coverage porcelain-fused-to-metal crowns
Evaluation of Full Veneered Porcelain-Fused-to-Metal Crowns Cemented With Self-Adhesive Resin Cement Using Two Curing Modes: A Randomized Clinical Trial
This test compares light‑activated (dual‑cure) versus chemical (self‑cure) modes of a self‑adhesive resin cement for adults getting full‑coverage PFM crowns to see which keeps crowns in place better.
Quick facts
| Phase | Not applicable |
|---|---|
| Study type | Interventional |
| Enrollment | 54 (estimated) |
| Ages | 21 Years and up |
| Sex | All |
| Sponsor | Cairo University Academic / other |
| Locations | 1 site (Cairo) |
| Trial ID | NCT07043998 on ClinicalTrials.gov |
What this trial studies
Adult patients needing full‑coverage porcelain‑fused‑to‑metal crowns receive restorations cemented with a self‑adhesive resin cement using either a dual‑cured protocol (light plus chemical cure) or a self‑cured protocol (chemical cure only). Participants are followed for 18 months with clinical evaluations at baseline, 6, 12, and 18 months. The primary outcome is crown retention measured by modified USPHS criteria, with secondary outcomes including marginal adaptation, recurrent caries, and marginal discoloration. The comparison aims to determine whether the curing mode affects short‑ to mid‑term clinical performance of PFM crowns.
Who should consider this trial
Good fit: Adults aged 21 or older who need a full‑coverage PFM crown, have sufficient tooth structure for retention, acceptable oral hygiene, and can attend all follow‑up visits are ideal candidates.
Not a fit: Patients with active periodontal disease, severe bruxism, poor oral hygiene, uncontrolled systemic conditions, pregnancy/nursing, or known allergies to the materials are unlikely to benefit or be eligible.
Why it matters
Potential benefit: If successful, the results could help dentists choose a cementing method that improves crown retention and reduces marginal problems for patients.
How similar studies have performed: Previous laboratory and some clinical studies show dual‑cure protocols can improve immediate polymerization and bond strength, but long‑term clinical superiority over purely self‑cure approaches is not firmly established.
Eligibility criteria
Show full inclusion / exclusion criteria
Inclusion Criteria: 1. Adult patients requiring full coverage PFM crown restorations 2. Age ≥ 21 years 3. Vital or endodontically treated teeth 4. Sufficient tooth structure for crown retention 5. Willing and able to provide written informed consent 6. Ability to attend all follow-up appointments 7. Adequate oral hygiene as determined by the investigator Exclusion Criteria: 1. Patients with active periodontal disease (probing depth \> 4mm, bleeding on probing) 2. Patients with severe parafunctional habits (e.g., bruxism confirmed by clinical examination) 3. Poor oral hygiene (plaque index \> 30%) 4. Pregnancy or nursing 5. Systemic diseases affecting treatment outcomes (e.g., uncontrolled diabetes, immunosuppression) 6. Known allergies to study materials (metal alloys, porcelain, or resin cement components) 7. Inability to comply with study requirements 8. Current participation in other dental clinical trials 9. Active orthodontic treatment
Where this trial is running
Cairo
- Faculty of Dentistry Cairo University — Cairo, Egypt (Recruiting)
Study contacts
- Study coordinator: Omnia Nabil, Associate Professor
- Email: omnianabil@dentistry.cu.edu.eg
- Phone: +201222201179
How to participate
- Review the eligibility criteria above with your treating physician.
- Visit the official trial page on ClinicalTrials.gov for the most current contact information and recruitment status.
- Contact the listed study coordinator or principal investigator to request pre-screening. Pre-screening is free and never obligates you to enroll.