When restoring teeth with IPS Empress laminate veneers, fracture of restorations may occur. So, material with higher mechanical properties is required. Celtra Duo is a new material with glass ceramics infiltrated by 10% zirconia particles which increase the fracture resistance of the material.

Inclusion Criteria:

All subjects are required to be:

1. From 18-50 years old, be able to read and sign the informed consent document.

2. Have no active periodontal or pulpal diseases, have teeth with good restorations

3. Psychologically and physically able to tolerate conventional dental procedures

4. Patients with teeth problems indicated for laminate veneer:

   1. Discoloration
   2. Fracture not involving more than 50% enamel loss
   3. Mild malposition
   4. Diastema
   5. Enamel fluorosis
   6. Stained or defective restorations

5. Able to return for follow-up examinations and evaluation

Exclusion Criteria:

1. Patient with post and core endodontically treated teeth
2. Patient with fractured teeth of more than 50% enamel loss
3. Patients with poor oral hygiene and motivation
4. Pregnant women's
5. Patients in the growth stage with partially erupted teeth
6. Psychiatric problems or unrealistic expectations
7. Lack of opposing dentition in the area of interest
8. Patients involved in contact sports
9. Teeth with deep discoloration

double blind