Root resorption during orthodontic treatment with Invisalign®: a radiometric study.
Root resorption during orthodontic treatment with Invisalign®: a radiometric study.
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DOI：
10.1186/s40510-017-0166-0
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发表时间：
2017-12
影响因子：
4.8
通讯作者：
Deregibus A
中科院分区：
文献类型：
--
作者：
Gay G;Ravera S;Castroflorio T;Garino F;Rossini G;Parrini S;Cugliari G;Deregibus A
牙根吸收(RR)被描述为从根尖永久丧失牙齿结构。文献中的许多报道表明，接受正畸治疗的患者更有可能出现严重的根尖缩短，有趣的是主要是上颌，其次是下颌切牙。该研究的目的是调查接受ALIGNERS治疗的成人患者RR的发生率和严重程度。研究小组由71名I类成年健康患者组成，平均年龄为32.8 ± 12.7，接受ALIGNER(InvisAlign®，Align Technologies，圣克拉拉，加利福尼亚州，美国)治疗。对所有的门牙、尖牙、上颌第一前磨牙和第一磨牙进行了评估。对1083颗患牙在治疗开始(T0)和治疗结束(T1)时的牙根和牙冠长度进行了全景X线片测量。测定每颗牙的个体根冠比(RCR)和相对变化(RRCR)。RRCR的减少被评估为在治疗过程中根长的减少。所有患者至少有1颗患牙发生牙根长度缩短，平均每例患者有1颗患牙 ± 为2.28颗。在1083颗被测量的牙齿中，有41颗，81%的牙齿在治疗前的牙根长度出现了缩短。在25.94%(n = 281)中发现>；0%到10%的百分比减少，在12.18%(n = 132)中发现>；10%到20%的明显减少。3.69%(n = 40)的牙齿受影响，其中有相当大的减少(>；20%)。使用InvisAlign®矫正器进行正畸治疗可能会导致RR。然而，其发生率与所描述的正畸光力非常相似，RR <； 的平均百分比为原始牙根长度的10%。
Root resorption (RR) is described as a permanent loss of tooth structure from the root apex. Many reports in the literature indicate that orthodontically treated patients are more likely to have severe apical root shortening, interesting mostly maxillary, followed by mandibular incisors. The aim of the study was to investigate the incidence and severity of RR in adult patients treated with aligners. The study group consisted of 71 class I adult healthy patients (mean age 32.8 ± 12.7) treated with aligners (Invisalign®, Align Technologies, Santa Clara, CA, USA). All incisors, canines, upper first premolars, and first molars were assessed. Root and crown lengths of 1083 teeth were measured in panoramic radiographs at the beginning (T0) and at the end (T1) of clear aligner therapy. Individual root-crown ratio (RCR) of each tooth and therefore the relative changes of RCR (rRCR) were determined. A decrease of rRCR was assessed as a reduction of the root length during treatment. All patients had a minimum of one teeth affected with a reduction of root length, on average 6.38 ± 2.28 teeth per patient. Forty one, 81% of the 1083, measured teeth presented a reduction of the pre-treatment root length. A reduction in percentage of >0% up to 10% was found in 25.94% (n = 281), a distinct reduction of >10% up to 20% in 12.18% (n = 132) of the sample. 3.69% (n = 40) of the teeth were affected with a considerable reduction (>20%). Orthodontic treatment with Invisalign® aligners could lead to RR. However, its incidence resulted to be very similar to that described for orthodontic light forces, with an average percentage of RR < 10% of the original root length.