Evaluation of Full Veneered Porcelain-Fused-to-Metal Crowns Cemented With Self-Adhesive Resin Cement Using Two Curing Modes

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