PATTERNS OF INCISOR ROOT RESORPTION BEFORE AND AFTER ORTHODONTIC CORRECTION IN CASES WITH ANTERIOR OPEN BITES
PATTERNS OF INCISOR ROOT RESORPTION BEFORE AND AFTER ORTHODONTIC CORRECTION IN CASES WITH ANTERIOR OPEN BITES
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DOI：
10.1016/0889-5406(92)70002-r
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发表时间：
1992-02-01
影响因子：
3
通讯作者：
HARRIS, EF
中科院分区：
文献类型：
--
作者：
HARRIS, EF
外牙根吸收是正畸治疗中常见的医源性后果，尤其是上颌前牙。由于吸收也是衰老的正常功能，并且即使在没有治疗的情况下，磨牙症和慢性咬指甲等行为改变也会加速吸收，因此推测舌头推力的长期矫形力导致前牙开咬也会增加碎裂活动的速率。在 32 名开牙合青少年的系列中，与治疗前深咬合的匹配系列相比，永久上颌中切牙的根部明显更短，并且根尖周吸收模式等级更高。开咬合组对这些牙齿的面部骨支撑也较少。两个系列在全带治疗期间都经历了明显的吸收，但程度相当，因此在积极治疗后，开牙合系列继续具有显着更高程度的吸收。因此，导致开颌畸形的口腔力量本身就会破坏牙根的完整性，值得及早识别和拦截。
External root resorption is a frequent iatrogenic consequence of orthodontic treatment, particularly in the maxillary anterior teeth. Since resorption also occurs as a normal function of aging and since altered behaviors such as bruxism and chronic nailbiting accelerate resorption even in the absence of treatment, it was hypothesized that the long-term orthopedic forces of tongue thrusting leading to anterior open bites would also enhance the rates of clastic activity. In a series of 32 adolescents with open bites, the roots of permanent maxillary central incisors were significantly shorter and exhibited higher modal grades of periapical resorption than a matched series with deep bites before treatment. The open bite group also had less facial bony support for these teeth. Both series experienced discernible resorption during full-banded treatment but to comparable extents so that, after active treatment, the open bite series continued to possess significantly greater degrees of resorption. Consequently, the oral forces leading to apertognathia are themselves destructive of root integrity and merit early recognition and interception.