Clinical Outcomes of Zirconia-reinforced Lithium Silicate Partial Coverage Crowns Compared to Lithium Disilicate Partial Coverage Crowns

Clinical Outcomes of Zirconia-reinforced Lithium Silicate Partial Coverage Crowns Compared to Lithium Disilicate Partial Coverage Crowns: A Randomized Controlled Clinical Trial

The purpose of this randomized controlled clinical trial is to evaluate the clinical outcomes of Partial Coverage Restorations fabricated with zirconia-reinforced lithium silicate ceramic system compared to partial coverage restorations fabricated with lithium disilicate ceramic system.

This study is constructed to assess in patients with carious vital posterior teeth whether the use of Vita Suprinity® (VITA Zahnfabrik H. Rauter GmbH & Co.KG- Germany) Zirconia reinforced lithium silicate partial coverage restorations will result in higher survival rates and better patient related outcome scores compared to IPS-e.max® CAD (Ivoclar Vivadent AG, Schaan - Liechtenstein) lithium disilicate partial coverage restorations.

Inclusion Criteria:

• Participants:
• Good oral hygiene, papillary bleeding index (PBI) < 35%.
• Positive patient acceptance to participate in the trial.

Teeth:

• Carious class II or MOD lesions
• Vital upper or lower posterior teeth with no signs of irreversible pulpitis.
• Normal occlusion
• Single tooth restoration (no edentulous space that requires fixed prosthesis)

Exclusion Criteria:

• Participants
• Pregnancy.
• Disabilities.
• Systemic disease or severe medical complications.
• Bad oral hygiene
• Heavy smoking.
• Xerostomia.
• Lack of compliance.
• Evidence of severe bruxism, clenching, or temporomandibular disorders.

Teeth:

• Deep carious defects (close to pulp, less than 1 mm distance).
• Periapical pathology or signs of pulpal pathology.
• Tooth hypersensitivity.
• Rampant caries.
• Non-vital or endodontically treated teeth.
• Sever periodontal affection.
• Tooth mobility