Tooth wear is a physiological process occurring from normal functioning of the dentition throughout lifetime.

The studies in the current literature indicated that both techniques of tooth preparation and the materials used are appropriate for the treatment of this condition, but the tendency is to reduce tooth preparation as reasonably possible. In this clinical trial, the investigators will compare the outcomes of direct resin composite and indirect polymer-infiltrated-ceramic-network.

Inclusion Criteria:

• Patients aged 18 years or older, in good general health, willing to participate in the study and accepting to come to regular controls in the future.
• Patients representing any type of significant tooth wear (≥ 1 mm depth) with dentine exposure in at least 4 teeth: localized tooth wear anterior or posterior teeth and generalized tooth wear anterio and posterior teeth.
• Patients having posterior support with at least 4 molars in occlusion, 1 pair per side, excluding third molar.

Exclusion Criteria:

• Patients wearing removable partial prosthesis
• Patients presenting skeletal Cl III occlusal Relationship
• Patients with remaining clinical crown of ≤ 3 mm in height and presenting tooth anomaly in shape and number in addition to anterior diastemas.
• Patients with symptomatic temporomandibular joint disorders.

The statistician will be blind to the treatment assigned to indivivual patients.