Shade Matching of Universal Versus Conventional Nanohybrid Resin Composites in Class IV Restorations After Bleaching

The use of a dental material that can blend into the surrounding tooth structure is increasing in popularity . A new technology , smart chromatic technology , has been introduced as the shade matching composite called omnichroma . Omnichroma has the ability to match the new lighter shade of the bleached teeth unlike the conventional composite . In this study , an investigation will be done to evaluate if this new technology will help to preserve the tooth structure and be more conservative , by avoiding the removal of the old anterior restorations after bleaching

Inclusion criteria

• Candidates must have one or more existing class IV restoration.
• Cases indicated for bleaching.
• Cooperative patient approving to participate in the trial.

Exclusion criteria

• Patients with severe medical conditions that might interfere with the study.
• Patients with rampant caries or xerostomia.
• Smoking.
• Patients with history of hydrogen peroxide sensitivity , periodontal inflammation.
• Lack of compliance.
• Tempromandibular joint disorders.
• Disabilities.