Vital and Non-vital Posterior Teeth Restored With Onlays and Single Crowns Using Three Different Restorative Materials.

Inclusion criteria

• • Subjects with the need for a fixed reconstruction in premolar and molar region with indication for either crown or onlay.

• min. 18 years of age and ≤ 80 years
• Patient with physical status PS1 and PS2 (according to Physical Status Classification System of the American Society of Anesthesiologists; Attachment 5)
• Capable of providing written informed consent
• Absence of any active periodontal and pulpal disease

Exclusion criteria

• Presence of conditions requiring chronic routine prophylactic use of antibiotics or prolonged use of steroids e.g. history of rheumatic heart disease, bacterial endocarditis, cardiac vascular anomalies, prosthetic joint replacements, etc.
• Patients with history of renal failure, bleeding disorders, metabolic bone disorder, uncontrolled endocrine disorders, HIV infection, Hepatitis
• History of neoplastic disease requiring the use of radiation or chemotherapy
• Inability to perform adequate oral hygiene
• Significant reduced saliva flow rate
• Unable or unwilling to cooperate for the trial period
• Allergy to any components of the reconstruction materials and cements
• Alcohol or drug abuse
• Pregnant or lactating women

Specific criteria:

• Root caries / root canal caries
• Extreme short dental arch (eSDA)
• Severe bruxism or clenching habits