The invention relates to the improvement of the root structure, in particular to the improvement of the two-piece root structure, which mainly includes a base and a crown fixing pillar, wherein one end of the base defines a threaded portion and the other end forms a snap groove, which is formed in the snap groove. At least three or more fixing blocks located on the inner wall, an insertion space is defined between the fixing blocks, and one end of the dental crown fixing pillar defines the dental crown fixing part, and the other end defines a locking structure. The locking structure includes a connecting part, at least three The fixed convex portion and a plurality of alignment spaces are respectively located between the fixed convex portions and the connecting portion and are used for accommodating the fixing block and simultaneously aligning the fixed convex portion with the fixed block. From the above, it can be known that the dental crown fixing pillars pass through at least The three fixing protrusions and the corresponding fixing blocks on the base can achieve stable engagement. At the same time, because the base and the crown fixing pillars are two-piece structure, the crown fixing pillars with different inclination angles to the base can be selected according to requirements. In order to improve the convenience of the installation operation space and the correct and stable angle of the tooth bed.本發明為牙根結構之改良，特別是指二件式牙根結構之改良，其主要包括基座及牙冠固定支柱，其中基座一端界定螺紋部另一端形成卡扣槽，位於卡扣槽內形成至少三個以上位於內壁之固定塊，各固定塊之間界定一插入空間，而牙冠固定支柱一端界定牙冠固定部另一端則界定卡固結構，卡固結構包括連接部、至少三個固定凸部以及複數分別位於各固定凸部與連接部之間且供容置固定塊同時將各固定凸部與各固定塊對位固定之對位空間，由上述可知，牙冠固定支柱透過至少三個固定凸部與基座上對應的固定塊可達到穩定卡合，同時因基座及牙冠固定支柱為兩件式結構，所以可視需求而選擇對基座不同傾斜角度的牙冠固定支柱，藉以提升安裝手術操作空間之便利性與牙齒牙床角度之正確穩合。
