The invention relates to biodegradable, biocompatible materials to promote regeneration of articular surfaces in the temporomandibular joint and, more particularly, to biomaterials and methods for facilitating fibrochondrocyte and chondrocyte growth in in-vitro and in-vivo environments. The materials include magnesium in solid form and polymer. The materials are effective to grow and regenerate fibrochondrocyte and chondrocyte cells, and restore bone cells.