The early reparative process of orthodontically induced root resorption in adolescents--location and type of tissue.
The early reparative process of orthodontically induced root resorption in adolescents--location and type of tissue.
复制标题
青少年正畸引起的牙根吸收的早期修复过程——组织的位置和类型。
DOI：
10.1093/ejo/20.6.727
复制
发表时间：
1998
影响因子：
2.6
通讯作者：
J. Kurol
中科院分区：
文献类型：
--
作者：
P. Owman;J. Kurol
本研究的目的是确定在施加良好控制的力大小后，青少年牙根吸收修复的组织位置和类型。在16名青少年（平均年龄13.8岁），上颌第一前磨牙颊向移动，每周重新激活力为50 cN（约50 g），持续6周，然后该装置被动2，3，6和7周。受试者被分为两组，每组8人，保留期为2周和6周（第I组），或3周和7周（第II组），这意味着个体内差异为4周。在所有测试牙齿中，在吸收腔中观察到修复性牙骨质，与2周和3周（分别为35%和44%）相比，在保留6周和7周（82%）后更常见。修复过程似乎开始于吸收腔的底部，通常被一层薄薄的脱细胞牙骨质覆盖。然而，大多数修复性牙骨质是细胞型的，并且总是覆盖最初形成的无细胞牙骨质。有很大的个体差异的发生愈合的正畸诱导的根吸收。
The aim of this investigation was to determine the pattern of repair of root resorption regarding the location and type of tissue in adolescents after application of a well-controlled force magnitude. In 16 adolescents (mean age 13.8 years), the maxillary first premolars were buccally moved with a weekly reactivated force of 50 cN (approximately 50 g) for 6 weeks following which the appliance was made passive for 2, 3, 6, and 7 weeks. The subjects were divided into two groups of eight individuals for which the retention periods were 2 and 6 weeks (Group I), or 3 and 7 weeks (Group II), implying intra-individual differences of 4 weeks. Reparative cementum in the resorption cavities was seen in all test teeth, significantly more often after 6 and 7 weeks of retention (82 per cent) compared with 2 and 3 weeks (35 and 44 per cent, respectively). The reparative process appeared to commence in the bottom of the resorption cavity, frequently covered by a thin layer of acellular cementum. However, most of the reparative cementum was of the cellular type and always covered the initially formed acellular cementum. There were great individual variations regarding the occurrence of healing of orthodontically-induced root resorption.