制作方法:取一段0.47毫米直径,约150—170毫米长的不锈钢丝,用其中段沿切牙及尖牙唇面中部弯成孤形,构成双曲唇弓之C段,此段与前牙的最突点接触。该段弧形曲度成圆孤状而不能有急转角。在一侧尖牙唇面中中1/3处画一记号,在记号处将钢丝弯成近直角,取一段0.5毫米内径约36毫米长的圆管(可用0.5毫米内径的注射针头代替)套 Production methods: Take a 0.47 mm in diameter, about 150-170 mm long stainless steel wire, with its middle along the incisors and canine middle face bent into a curved lumbar arch, forming bicylindrical lip C section, this section and the front teeth The most prominent point of contact. The curvature of the arc into a round shape without a sharp corner can be acute. Draw a mark on the middle 1/3 of the canine face at one side and bend the wire near right angle at the mark. Take a 0.5 mm long round tube with an inner diameter of about 36 mm (replaceable with a 0.5 mm ID needle)