Alveolar bone change of the maxillary anterior region after retraction in adult patients with class II1 malocclusion using cone-beam CT

doi:10.3969/j.issn.2095-4344.1244

Abstract

Abstract:

BACKGROUND: Extraction is commonly used for class II malocclusion to achieve normal cover and improve facial feature and lateral appearance, and the treatment efficacy is directly related to adduction degree of anterior teeth and alveolar bone reconstruction.
OBJECTIVE: To investigate the alveolar bone change of the maxillary anterior region after retraction in adult patients with class II1 malocclusion.
METHODS: Thirty adult patients with class II1 malocclusion were selected. After aligned and replaced with stainless steel square wire for 1 month (T0 stage), the upper anterior teeth were retracted with type II traction for 1 month (T1 stage). Cone-beam CT was made before and at T0 and T1 stages. The upper anterior teeth volume, alveolar bone thickness and height were measured.
RESULTS AND CONCLUSION: (1) After retraction, the crown of the upper middle incisor was moved lager than root in tongue direction. (2) The thickness of the alveolar bone significantly increased in the labial region except the apical region (P < 0.05), and the apical area changed inversely. (3) Both labial and palatal alveolar ridge decreased, and difference on the palatal side was significant (P < 0.05). (4) In summary, for adult patients with class II1, a tipping movement occurred in the process of anterior retraction. During retraction, the alveolar bone changes are not consistent with the movement of the teeth, and active bone remodeling occurred on both labial and palatal sides, but overall, bone resorption is greater than bone hyperplasia.

中国组织工程研究杂志出版内容重点：组织构建；骨细胞；软骨细胞；细胞培养；成纤维细胞；血管内皮细胞；骨质疏松；组织工程

Key words: class II1 malocclusion, abduction of anterior teeth, CBCT, alveolar bone morphology, cone-beam CT

CLC Number:

R496

Jiang Weijie1, 2, Liu Jun2, Liu Changcui3, Zhang Chen1, 2. Alveolar bone change of the maxillary anterior region after retraction in adult patients with class II1 malocclusion using cone-beam CT[J]. Chinese Journal of Tissue Engineering Research, 2019, 23(19): 2986-2990.

Figures/Tables 4

References

[1] 傅民魁,张丁,王邦康,等.中国25392名儿童与青少年错合畸形患病率的研究[J].华口腔医学杂志, 2002,37(5):371-373.

[2] 林久祥,许.赵.口腔正畸学[M].北京: 人民卫生出版社,2011:177-178.

[3] Huang M, Hu Y, Yu J, et al.Cone-beam computed tomographic evaluation of the temporomandibular joint and dental characteristics of patients with Class II subdivision malocclusion and asymmetry. Korean J Orthod.2017;47(5):277-288.

[4] Janson G, Branco NC, Morais JF, et al.Smile attractiveness in patients with Class II division 1 subdivision malocclusions treated with different tooth extraction protocols.Eur J Orthod.2014;36(1):1-8.

[5] Schwab DT.The borderline patient and tooth removal. Am J Orthod. 1971;59(2):126-145..

[6] Williams R, Hosila FJ. The effect of different extraction sites upon incisor retraction. Am J Orthod. 1976;69(4):388-410.

[7] de Castro N. Second-premolar extraction in clinical practice. Am J Orthod. 1974;65(2):115-137.

[8] Drobocky OB, Smith RJ. Changes in facial profile during orthodontic treatment with extraction of four first premolars. Am J Orthod Dentofacial Orthop. 1989;95(3):220-230.

[9] Makedonas D, Lund H, Hansen K. Root resorption diagnosed with cone beam computed tomography after 6 months and at the end of orthodontic treatment with fixed appliances. Angle Orthod. 2013;83(3): 389-393.

[10] Hua Y, Nackaerts O, Duyck J,et al.Bone quality assessment based on cone beam computed tomography imaging. Clin Oral Implants Res. 2009;20(8): 767-771.

[11] 刘映鸿,周泽渊,赵奎,等.青少年患者前牙内收过程中牙槽骨改建情况的锥形束CT研究[J].华西口腔医学杂志, 2016,1(34): 78-84.

[12] Nauert K, Berg R.Evaluation of labio-lingual bony support of lower incisors in orthodontically untreated adults with the help of computed tomography. J Orofac Orthop. 1999;60(5):321-334.

[13] Vardimon AD, Graber TM, Voss LR,et al.Determinants controlling iatrogenic external root resorption and repair during and after palatal expansion. Angle Orthod.1991;61(2): 113-122; discussion 123-124.

[14] Ahn HW, Moon SC, Baek SH. Morphometric evaluation of changes in the alveolar bone and roots of the maxillary anterior teeth before and after en masse retraction using cone-beam computed tomography. Angle Orthod. 2013;83(2):212-221.

[15] 陈香,张向凤,黄倩倩,等.微种植体支抗辅助内收上切牙后牙槽骨改建的锥形束CT研究[J].上海口腔医学,2018，27(2): 150-155.

[16] 许天民, 刘妍, 江久汇,等.正畸内收上切牙对上颌牙槽骨改建的临床研究[J].实用口腔医学杂志,2004,20(4):431-433.

[17] Sarikaya S, Haydar B, Ci?er S,et al.Changes in alveolar bone thickness due to retraction of anterior teeth. Am J Orthod Dentofacial Orthop. 2002;122(1):15-26.

[18] Guo QY, Zhang SJ, Liu H, et al.Three-dimensional evaluation of upper anterior alveolar bone dehiscence after incisor retraction and intrusion in adult patients with bimaxillary protrusion malocclusion. J Zhejiang Univ Sci B. 2011;12(12):990-997.

[19] Marks SC Jr, Cahill DR, Wise GE. The cytology of the dental follicle and adjacent alveolar bone during tooth eruption in the dog. Am J Anat. 1983;168(3):277-289.

[20] 林薇薇,陈金武, 成人前牙内收前后切牙牙槽骨高度变化的研究[J].实用口腔医学杂志, 2014. 30(6): 823-826.

[21] Cobo J,Argüelles J,Puente M,et al.Dentoalveolar stress from bodily tooth movement at different levels of bone loss. Am J Orthod Dentofacial Orthop.1996;110(3):256-262.

[22] Tanne K,Nagataki T,Inoue Y,et al.Patterns of initial tooth displacements associated with various root lengths and alveolar bone heights.Am J Orthod Dentofacial Orthop.1991;100(1):66-71.

[23] 姜若萍,傅民魁.正常汉族成年人前牙区牙槽宽度及根尖位置的研究[J].口腔正畸学,2008,15(1):16-19.

[24] 杨雪，钱玉芬.上前牙内收过程中转矩控制的影像学研究[J].上海口腔医学, 2016，25(4): 469-474.