The present invention relates to a model appliance for preparing dental prosthesis in order to form a whole teeth frame while air bubbles are not generated in the teeth frame by forming pressure protrusions to press both sides and top of teeth inside the model appliance for preparing dental prosthesis. The model appliance is a ??shaped model appliance (10) surrounding the inside and the outside of arranged teeth (3) in order for a teeth frame to be formed based on an impression material (2). The ??shaped model appliance (10) comprises a top pressure protrusion (11) to press the top of the teeth (3) by protruding from the inner surface in a longitudinal direction an inner pressure protrusion (12) protruding from the inner surface in a longitudinal direction to press the inner surface of the teeth (3) and an outer pressure protrusion (13) protruding from the inner surface in a longitudinal direction to press the outer surface of the teeth (3). The present invention prevents an impression material (2) from being wasted as a whole teeth frame is formed without air bubbles in the teeth frame by pressing the impression material (2) to the top of the teeth (3) using the top pressure protrusion (11) protruding from the top of the model appliance (10) and pressing the impression material (2) toward the inner surface and the outer surface of the teeth using the inner pressure protrusion (12) and the outer pressure protrusion (13) protruding from the inner surface and the outer surface of the model appliance (10). Furthermore, the waste of time required for dental prosthesis due to the deterioration of impression bodies can be prevented.COPYRIGHT KIPO 2014본 발명은 치아 보철 준비용 모델 기구 내에 치아의 양측면 및 상면을 가압하는 가압 돌기를 형성함으로써 치아 음형에 기포가 생기지 않게 되고, 온전히 치아 음형이 형성되도록 한 치아 보철 준비용 모델 기구에 관한 것으로서, 배열된 치아(3)의 내측과 외측에서 인상재(2)에 음형이 형성되도록 감싸는 디귿자 형상의 모델 기구(10)이고 상기 디귿자 형상의 모델기구(10)는, 그 내측면에 길이 방향으로 돌설되어 치아(3)의 상면을 가압하는 상면 가압 돌기(11)와, 그 내측면에 길이 방향으로 돌설되어 치아(3)의 내측면을 가압하는 내측면 가압 돌기(12)와, 그 내측면에 길이 방향으로
