The branch of prosthodontics concerned with the replacement or restoration of tooth by artificial substitutes that are easily removable for instance a denture, partial denture and interim prosthesis. X12 appoints many sorts of liaisons, including exterior and internal liaisons. Interior liaisons coordinate between two X12 groups. 模块化积木式设计、面向未来的基于开放标准的平台，适用于... https://matthewc974qwd9.wikitelevisions.com/user