Efficacy of a Collagen Matrix for Soft Tissue Augmentation After Implant Placement Compared to Connective Tissue Grafts: A Multicenter, Noninferiority, Randomized Controlled Trial

Subjects in need of soft tissue volume augmentation at single tooth implant sites were consecutively recruited at nine centers. The deficient mucosal thickness at the implant sites was augmented by applying either a volume augmentation using a collagen matrix or a single implant sites, compared to connective tissue grafts.