Rönnerman A, Thilander B
Scand J Dent Res. 1977 Jul;85(5):362-72. doi: 10.1111/j.1600-0722.1977.tb01516.x.
The effect of unilateral extraction of the first or second primary molar on space conditions, need for orthodontic treatment, and eruption stage of permanent canines and second molars has been studied longitudinally in two groups. In Group 1 the first primary molar had been extracted early in 13 cases in the maxilla and in 14 cases in the mandible. In Group 2 the corresponding figures for the second primary molar were 14 and 24 for the maxilla and mandible, respectively. The space on the extraction side in Group 1 was significantly less than on the control side at the age of 9 but not at the age of 13. In Group 2 there was significantly less space on the extraction side than on the control side at the two registration ages (10.5 and 12 years). Need for orthodontic treatment was low in Group 1 and high in Group 2. As for eruption stage of permanent canines and second molars, no significant differences were found between the extraction side and the control side in the two groups.
在两组中纵向研究了单侧拔除第一或第二乳磨牙对间隙情况、正畸治疗需求以及恒尖牙和第二磨牙萌出阶段的影响。在第1组中，13例上颌和14例下颌的第一乳磨牙早期被拔除。在第2组中，上颌和下颌第二乳磨牙的相应病例数分别为14例和24例。第1组拔牙侧在9岁时的间隙明显小于对照侧，但在13岁时并非如此。在第2组中，在两个记录年龄（10.5岁和12岁）时，拔牙侧的间隙明显小于对照侧。第1组正畸治疗需求低，第2组正畸治疗需求高。至于恒尖牙和第二磨牙的萌出阶段，两组的拔牙侧和对照侧之间未发现显著差异。
