因龋坏、外伤等原因造成乳牙早失 ,如不及时处理 ,将引起缺隙处间隙的丢失。对儿童的咀嚼功能、颌骨发育及恒牙的萌出都有影响 ,是牙牙合畸形的常见原因之一。为了保持乳牙早失造成的间隙 ,临床上常用丝圈缺隙保持器 ,其制做多采用锤冠的工艺方法。笔者用预成带环制做丝圈式缺? Due to dental caries, trauma and other causes of premature deciduous teeth, if not promptly treated, will cause a gap gap at the missing. The chewing function of children, jaw development and eruption of permanent teeth have an impact, is one of the common causes of occlusal deformity. In order to maintain the gap caused by early loss of deciduous teeth, commonly used in the wire ring gap retainer, the system to do more to use hammer crown process. I used to do with the pre-ring ring-type lack?