1、 Nature of invisible dentures:

1. The elastic clasp has a better retention effect because it can use soft tissue to retain the abutment. Especially in the case of too short abutment crown or small abutment crown, the elastic clasp can make better use of the undercut and is not easy to fall off. Moreover, because the clasp of the denture and the abutment surface form surface contact, the friction force is much greater than that of the metal clasp with only point line contact.

2. 2. The retainer made of elastic resin is designed on the tooth neck and the alveolar ridge below to jointly bear external forces. Its elasticity and toughness can also buffer the chewing pressure of the edentulous area, play a physiological massage role, and produce less damage to the abutment teeth such as lateral stress. In addition, the elastic snap ring, the base and the abutment are well sealed, and it is not easy to store food.

3. All movable dentures made of elastic resin are generally supported by mucosa, and the (occlusal) force is not easy to disperse, and the chewing efficiency is low. The elastic resin is not easy to be highly polished, it is not easy to repair after damage, and it cannot be relined.

2、 Advantages of invisible denture:

The invisible denture has the advantages of high elasticity and fracture resistance, invisible base, beautiful appearance, simple and quick operation, and less or no molars. Especially for the defect of anterior teeth and premolars, the traditional removable dentures are affected by the exposure of metal clasps, while the invisible denture base is invisible. The material has high bending resistance and can be made thin and comfortable. Moreover, the elastic material can enter the concave area of the abutment, with good adhesion to the mucosa, good retention and convenient access.