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正畸治疗的特点之一就是要根据牙移动的需要随时增减副簧(指簧)。有的可在基托组织面上增加,用自凝塑胶粘接;有的需要在唇、舌弓上增加,则必须使用焊接技术。正畸临床上一般采用的焊接方法有银焊、电直接熔焊、或金合金焊接。它们都各有一定的优缺点,但共同存在的主要问题是
One of the characteristics of orthodontic treatment is to increase or decrease the secondary spring (referring to the spring) according to the needs of tooth movement. Some may increase in the surface of the base tissue, with self-adhesive plastic; some need to increase in the lips, tongue bow, you must use the welding technology. Orthodontic clinically commonly used welding methods are silver welding, electric direct welding, or gold alloy welding. They all have their own advantages and disadvantages, but the main problem that co-exists is