Zirconia and Metal-based Single Crown Posterior Restorations.

Inclusion Criteria: * Informed Consent as documented by signature * Male and female patients from 18-70 years of age * Need for a single crown restoration * Presence of antagonist * minimum of 20 teeth * moderate to good oral hygiene with the ability to perform mechanical oral hygiene techniques including tooth brushing * low to moderate caries risk, and no active periodontal disease. Exclusion Criteria: * Women who are pregnant at the date of inclusion * Known or suspected non-compliance, drug or alcohol abuse * Inability to follow the procedures of the study, e.g. due to language problems, psychological disorders, dementia, etc. of the participant * Smoking more than 15 cigarettes a day * Poor oral hygiene (Plaque Index over 30%) * Bruxism * vital teeth * allergic reaction or hypersensitivity to ingredients of the adhesive or restorative material