The aim of this study is to evaluate tooth sensitivity and marginal adaptation of porcelain laminates veneers prepared with modified gull wing preparation and conventional preparation.

Visit 1: Preoperative records, face-to-face adherence reminder session, clinical, radio-graphic examination and primary impression for diagnostic cast construction.

Visit 2: Teeth preparation, secondary impression,temporary restoration and teeth sensitivity evaluation using United States Public Health Service criteria.

Visit 3: Placement and permanent cementation of the final restoration

Visit 4: marginal adaptation measurement by electron microscope using impression replica.

Inclusion Criteria:

• From 18-40 years old, be able to read and sign the informed consent document.
• Be physically and psychologically able to tolerate conventional restorative Procedures.
• Have no active periodontal or pulpal diseases, have teeth with good restorations.
• Patients with teeth problems indicated for laminate veneer (e.g:discoloration, fracture not involve more than 50% enamel loss, mild malposition.
• Be willing to return for follow-up examinations and evaluation.

Exclusion Criteria:

• Patients in the growth stage with partially erupted teeth.
• Patient with fractured teeth of more than 50% enamel loss.
• Patients with poor oral hygiene and motivation.
• Pregnant women.
• Patient with post and core endodontically treated teeth.
• Psychiatric problems or unrealistic expectations.
• Lack of opposite occluding dentition in the area intended for restoration