临床上后牙因多种因素引起牙体折裂,造成牙体多面缺损。如咬(牙合)创伤性折裂或因牙髓治疗后牙体缺乏营养折裂等。以前牙体广泛缺损特别是后牙都建议拔除。现在我们将保留牙体的适应症扩大到一定的范围。如下颌第一、二磨牙远中、近中、舌侧三面缺损,或上颌第一、二磨牙腭侧远中、近中折裂并且折至冠颈,呈只剩下根部而根颈1/3暴露在龈上者。经过对患牙的治疗,然后在折裂缺损 Clinically, a variety of factors cause post-tooth fractures of the teeth, resulting in multi-faceted defects. Such as bite (occlusal) traumatic fracture or dental pulp treatment due to the lack of nutritional fracture. In the past a wide range of dental defects, especially after the removal of the teeth are recommended. Now we will retain the indication of the tooth to a certain extent. Such as the first jaw, two molars in the distance, near, tongue three defects, or maxillary first, two molars palatal distal, proximal and middle folds and fold to the crown, was only the root and the root of the neck 1 / 3 Exposed to the supragingulcus. After the treatment of teeth, and then in the fracture defect