Vertical Soft Tissue Augmentation With CTG vs ADM

Inclusion criteria: * Age ≥ 18 years * Periodontally and systemically healthy * Full-mouth plaque score and full-mouth bleeding score ≤ 20% (measured at four sites per tooth) * Presence of single functional dental implant in the anterior with a PSTD * Implants diagnosed as healthy (Berglundh et al., 2018) Exclusion criteria are: * Contraindications for surgery * Systemic condition (e.g. diabetes mellitus, HIV, cancer, etc) that could compromise wound healing * Patients pregnant or attempting to get pregnant (self-reported) * Untreated periodontitis * Untreated peri-implant mucositis or peri-implantitis (Berglundh et al., 2018) * Smoking, defined as self-reported daily habit. Occasional smokers won't be excluded * History of soft tissue grafting at the implant site within the last 6 months