Abstract
In a search for the ideal material for soft tissue augmentation, many substances have been proposed, including fat, dermis, fascia, allograft, and xenograft. Although these materials have some efficacy, they all have significant disadvantages. The ideal substance for soft tissue augmentation would be biocompatible, nonim-munogenic, easily obtainable, low-cost, nonresorbable, and easy to store. Such a material does not exist at this time, but two recent soft tissue augmentation materials are autologous, injectable, dermal collagen (Autologen®), developed by the Collagenesis Corporation (Beverley, MA) and acellular dermal homograft (AlloDerm®), developed by the LifeCell Corporation (The Woodlands, TX). A comparison of these two products reveals the potential of each in facial soft-tissue augmentation (Table).

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