Cone-beam CT evaluation of volume and surface area changes of impacted upper central incisors before and after orthodontic treatment

doi:10.19439/j.sjos.2017.01.016

Abstract

Abstract: PURPOSE: The purpose of this study was to quantitatively evaluate root resorption by cone-beam computer tomography (CBCT) after orthodontic treatment of impacted upper central incisors. METHODS: Ten patients (12 impacted incisors and 8 contralateral corresponding teeth) were included in this study. With self-designed modified nance arch and straight wire arch, the impacted incisors were treated by combined orthodontics and surgery approach. CBCT images of all patients were taken before and immediately after the treatment. Mimics software was used to build three-dimensional images. The upper central incisors were isolated. Volumes of teeth and superficial area were calculated. The difference between pre- and post- treatment was statistically evaluated with paired samples t test using SPSS13.0 software package. RESULTS: Significant difference in volume and superficial area was found between pre- and post- treatment (P<0.05). The average whole dental volume increase was (9.67±10.86) mm³, and the superficial area increase was (28.97±14.36)mm². Statistical significance was achieved among 12 impacted incisors. The average whole dental volume increase of the control group was（12.38±10.22）mm³, and the superficial area increase was（30.64±16.74）mm². There was no significant difference between the impacted and the control group in dental volume and superficial area before and after treatment (P>0.05). CONCLUSIONS: The treatment by combined orthodontics and surgery approach could promote tooth development for impacted incisors without causing root absorption, which can be safely performed.

CLC Number:

R782.1

LIN Yan, JIANG Yin-hua, TAO Hai-biao, SUN Hao, HU Rong-dang. Cone-beam CT evaluation of volume and surface area changes of impacted upper central incisors before and after orthodontic treatment[J]. Shanghai Journal of Stomatology, 2017, 26(1): 76-79.

References

[1] Sun H, Wang Y, Sun C, et al. Root morphology and development of labial inversely impacted maxillary central incisors in the mixed dentition: a retrospective cone-beam computed tomography study[J]. Am J Orthod Dentofacial Orthop, 2014, 146(6): 709-716.
[2] 步捷, 王旭霞, 张君, 等. 恒牙埋伏阻生的临床分析 [J]. 临床口腔医学杂志, 2007, 23(6): 363-366.
[3] Knop LA, Shintcovsk RL, Gandini LG Jr, et al. Impaction of maxillary central incisors: surgical and orthodontic treatment case report [J]. Int J Orthod Milwaukee, 2015,26(3): 25-29.
[4] Sun H, Hu R, Ren M, et al. The treatment timing of labial inversely impacted maxillary central incisors: a prospective study [J]. Angle Orthod, 2016, 86(5): 768-774.
[5] Leite V, Conti AC, Navarro R, et al. Comparison of root resorption between self-ligating and conventional preadjusted brackets using cone-beam computed tomography [J]. Angle Orthod, 2012, 82(6): 1078-1082.
[6] Sameshima GT, Asgarifar KO. Assessment of root resorption and root shape: periapical vs panoramic films [J]. Angle Orthod, 2001, 71(3): 185-189.
[7] Han G, Huang S, Von den Hoff JW, et al. Root resorption after orthodontic intrusion and extrusion: an intraindividual study [J]. Angle Orthod, 2005, 75(6): 912-918.
[8] Madani Z, Moudi E, Bijani A, et al. Diagnostic accuracy of cone-beam computed tomography and periapical radiography in internal root resorption [J]. Iran Endod J, 2016, 11(1): 51-56.
[9] Li W, Chen F, Zhang F, et al. Volumetric measurement of root resorption following molar mini-screw implant intrusion using cone beam computed tomography [J]. PLoS One, 2013, 8(4): e60962.
[10] Baysal A, Karadede I, Hekimoglu S, et al. Evaluation of root resorption following rapid maxillary expansion using cone-beam computed tomography [J]. Angle Orthod, 2012, 82(3): 488-494.
[11] Elhaddaoui R, Benyahia H, Azeroual MF, et al. Resorption of maxillary incisors after orthodontic treatment-clinical study of risk factors [J]. Int Orthod, 2016, 14(1): 48-64.
[12] Thirunavukkarasu R, Sriram G, Satish R. The orthodontic management of ectopic canine [J]. J Pharm Bioallied Sci, 2015,7(Suppl 2): S749-751.
[13] Abuabara A. Biomechanical aspects of external root resorption in orthodontic therapy [J]. Med Oral Patol Oral Cir Bucal, 2007, 12(8): E610-613.
[14] Jiang RP, McDonald JP, Fu MK. Root resorption before and after orthodontic treatment: a clinical study of contributory factors [J]. Eur J Orthod, 2010, 32(6): 693-697.
[15] Chaushu S, Becker T, Becker A. Impacted central incisors: factors affecting prognosis and treatment duration [J].Am J Orthod Dentofacial Orthop, 2015, 147(3): 355-362.