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2.关闭间隙;适用于牙列稀疏,可出现于上下前牙部分,也可出现于上下后牙部分,即骨量大于牙量。一般前牙间隙小,覆盖大,可用矫正器唇弓收缩间隙而关闭。间隙多而较大,不论前牙或后牙,则在间隙关闭后,按部分义齿设计要求,进行修复。 3.升高或压低;升高适用于低位牙,使其达到(牙合)平面。一般用带环上放牵引钩粘于低位牙上,用颌内或颌间牵引而矫治。压低适用于高位牙,使其降到咬(牙合)面。上下前牙一般用平面导板加爪簧,后牙则可用(牙合)垫,通过咀
2. Close the gap; suitable for dentition sparse, can appear in the upper and lower anterior part, can also appear in the upper and lower posterior teeth, that is, the amount of bone is greater than the amount of teeth. General anterior gap is small, covering a large, can be used to close the gap between the appliance arch lip contraction. Gap more and larger, regardless of anterior teeth or posterior teeth, the gap is closed, according to some denture design requirements for repair. 3. Raise or lower; raise for lower teeth to reach (occlusal) plane. The general use of the ring on the traction hook glued to the lower teeth, with jaw or jaw traction and correction. Depress for high teeth, make it down to bite (occlusal) face. Upper and lower anteroposterior generally flat guide plate plus claw spring, posterior teeth are available (occlusal) pad, through the Tsui