Kuwahara S
Nihon Kyosei Shika Gakkai Zasshi. 1989 Dec;48(6):601-13.
The purpose of this study was to investigate the functional changes following the orthodontic treatment of anterior reversed occlusion in children. Samples consist of 94 children with anterior reversed occlusion as the experimental group and 34 children with normal incisor occlusion as the control group. Experimental samples were classified into 3 groups according to the erupting stages of incisors. Among them, a group of the permanent incisor dentition was divided into 2 groups, one was a "Shift group" showing functional mandibular movement from the centric relation to intercuspal position and the other was a "non-shift group" showing no such functional movement. In the experimental group, 28 patients showed the correction of anterior reversed occlusion orthodontically. Mandibular movements were recorded during gum chewing on all subjects by using Sirognatho Analysing System II. Mandibular movement was examined as to the cycle time and the chewing movement on the horizontal plane. The results were as follows: 1. The chewing cycle was irregular in samples of reversed occlusion. 2. Samples of reversed occlusion with deciduous incisors and of normal occlusion were equivalent in the cycle time. 3. The chewing cycle was more longer in samples of reversed occlusion with maxillary deciduous and mandibular permanent incisors than those of normal occlusion. 4. The chewing cycle was longer in the Shift group than in the normal group. But it was not longer in the Non-shift group than in the normal group. 5. The chewing movement of the Shift group showed type-1, 2, 3 rather than type 4. But the non-shift group showed type-4 more than type-1, 2, 3. 6. The chewing cycle became more regularized after the correction of anterior reversed occlusion. 7. The chewing cycle was shortened in the Shift group after the correction of anterior reversed occlusion. 8. The chewing movement of type-1 and type-4 were decreased after the correction of anterior reversed occlusion. In conclusion, the correction of anterior reversed occlusion by orthodontic method provides improvements of not only the morphological incisor occlusion but also the functional mandibular movements.
本研究的目的是调查儿童前牙反牙合正畸治疗后的功能变化。样本包括94名患有前牙反牙合的儿童作为实验组，以及34名切牙咬合正常的儿童作为对照组。实验组样本根据切牙的萌出阶段分为3组。其中，恒牙列组又分为2组，一组是“移位组”，显示功能性下颌从正中关系到牙尖交错位的运动，另一组是“非移位组”，未显示此类功能性运动。在实验组中，28例患者通过正畸矫正了前牙反牙合。使用Sirognatho Analysing System II记录所有受试者咀嚼口香糖时的下颌运动。检查下颌运动的周期时间和水平面上的咀嚼运动。结果如下：1. 反牙合样本的咀嚼周期不规则。2. 乳牙列反牙合样本和正常咬合样本的周期时间相当。3. 上颌乳牙和下颌恒牙反牙合样本的咀嚼周期比正常咬合样本更长。4. 移位组的咀嚼周期比正常组更长。但非移位组的咀嚼周期不比正常组更长。5. 移位组的咀嚼运动表现为1、2、3型而非4型。但非移位组表现为4型的比1、2、3型更多。6. 前牙反牙合矫正后咀嚼周期变得更加规律。7. 前牙反牙合矫正后移位组的咀嚼周期缩短。8. 前牙反牙合矫正后1型和4型的咀嚼运动减少。总之，正畸方法矫正前牙反牙合不仅改善了切牙咬合形态，还改善了下颌的功能性运动。
