当双侧后牙游离缺失,仅有前牙存在,需作下颌部份义齿时,须用舌杠来连接两侧鞍基。最好不用塑胶或铸造结构支持在牙齿或粘膜上,因为它可能引起牙周的损伤。舌杠宜硬,且有适当的宽度和厚度,尽可能用合金铸造制成。硬的舌杠可均匀分配胎力到基牙上。塑胶与金属交接点,和舌杠的中部需要加强。 When the bilateral posterior teeth missing, only the existence of anterior teeth, mandibular partial dentures to be used, the tongue must be used to connect both sides of the saddle. It is best not to use plastic or cast structures on the teeth or mucous membranes as it may cause periodontal damage. Tongue should be hard, and have the appropriate width and thickness, made of alloy casting as possible. Hard tongues evenly distribute the force onto the abutment. Plastic and metal joints, and the middle of the tongue need to be strengthened.