Lithium Disilicate Crowns Study

Clinical Evaluation of Lithium Disilicate CAD/CAM Crowns

CAD-CAM crowns made of experimental lithium disilicate (shades A1, A2 and A3) are placed in patients by using either a dual-curing adhesive or a self-adhesive luting material in combination with total etch/universal bonding agent.

Inclusion Criteria:

• Patients will be at least 18 years of age, of either gender, and of any ethnic background.
• Each patient should have at least one carious lesion or defective restoration to be restored on a maxillary or mandibular premolar or molar tooth.
• Each lesion or defective restoration should exhibit sufficient size or loss of tooth structure requiring a full crown restoration.
• The tooth should have at least one opposing tooth in occlusion and one adjacent tooth with an intact proximal contact.
• All teeth will test vital and be asymptomatic at the beginning of treatment. No more than two restorations will be placed per patient.

Exclusion Criteria:

• Devital or sensitive teeth
• Teeth with prior endodontic treatment of any kind
• Teeth with a history of direct or indirect pulp capping procedures
• Patients with significant untreated dental disease to include periodontitis and/or rampant caries
• Women who self-report that they are possibly pregnant, pregnant, or lactating, as elective dental treatment is not indicated at these times
• Patients with a self-reported past history of allergies to the materials to be used in the study including composite resin cements or ceramic restorative materials
• Patients unable to return for the recall appointments