This clinical trial aims to compare two guided bone regeneration (GBR) techniques in patients with horizontal ridge deficiency in the anterior esthetic region. Specifically, it evaluates the use of a prefabricated CAD/CAM zirconia membrane versus conventional contour augmentation performed simultaneously with dental implant placement. The study includes male and female patients aged 20 to 50 years who are in good general health, maintain adequate oral hygiene, and present with a Class I ridge defect as per Seibert's classification.

The primary objective is to determine whether the customized zirconia membrane provides equivalent clinical and radiographic outcomes in terms of bone gain and soft tissue healing compared to the contour augmentation technique. Participants will also report their postoperative discomfort and overall satisfaction using a 100-point visual analog scale (VAS), recorded at multiple time points: 1, 6, and 12 hours, as well as 1, 3, 7, and 15 days postoperatively.

Inclusion Criteria:

• Patients of both genders within the age range of 20-50 years.
• Patients with good general health and adequate oral hygiene practices.
• Stable periodontal condition and favorable soft tissue profile.
• Alveolar ridge that has a Class I defect according to Seibert's classification of ridge defects.

Exclusion Criteria:

• Patients with medical conditions or systemic diseases precluding periodontal surgery or hampering wound healing (e.g., uncontrolled diabetes mellitus or metabolic bone disorders).
• Patients subjected to irradiation in the head and neck area.
• Patients with a history of taking any medications in the previous 6 months that may interfere with periodontal tissue health or healing.
• Patients have poor oral hygiene and motivation.
• Patients with active periodontitis or acute infection in the area intended for implant placement.
• Females who are pregnant or trying to conceive, and nursing mothers.