Correlation between changes in soft tissue thickness of the. Lower lip and chin and incisor retraction
Main Article Content
Abstract
A regression study was conducted on 34 Vietnamese adult subjects to describe the changes in chin and lower lip thickness following orthodontic treatment with premolar extractions in patients with bimaxillary dentoalveolar protrusion, and to evaluate the correlation between chin and lip thickness changes and the movement of the incisors. The results showed that after treatment, lower lip thickness (LL-L1c) increased by an average of 1.16 ± 0.87mm (p < 0.01), while the thickness at B-B’ decreased by 1.18 ± 1.74mm (p < 0.01). Changes in Pog-Pog’ and Me-Me’ thicknesses were not statistically significant (p > 0.05). The change in LL-L1c thickness was positively correlated with the amount of retraction of the upper incisor edge (U1tip-y), lower incisor edge (L1tip-y), and point B (B-y). Multiple regression analysis showed that the model explained 37.8% of the variance in LL-L1c thickness (R² = 0.378; p = 0.002), with the regression equation: ΔLL-L1c = -2.129 + 0.112 (ΔU1tip-y) + 0.038 (ΔL1tip-y) + 0.111 (ΔB-y).
Article Details
Keywords
Lower lip thickness, chin soft tissue thickness
References
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13. Yashwant V. A, K. R, Arumugam E. Comparative evaluation of soft tissue changes in Class I borderline patients treated with extraction and nonextraction modalities. Dental Press Journal of Orthodontics. 2016; 21(4): 50-59. doi:10.1590/2177-6709.21.4.050-059.oar.
14. Kuhn M, Markic G, Doulis I, Göllner P, Patcas R, Hänggi MP. Effect of different incisor movements on the soft tissue profile measured in reference to a rough-surfaced palatal implant. American Journal of Orthodontics and Dentofacial Orthopedics. 2016; 149(3): 349-357. doi:10.1016/j.ajodo.2015.08.017.
15. Hayashida H, Ioi H, Nakata S, Takahashi I, Counts AL. Effects of retraction of anterior teeth and initial soft tissue variables on lip changes in Japanese adults. The European Journal of Orthodontics. 2011; 33(4): 419-426. doi:10.1093/ejo/cjq095.
16. Hodges A, Rossouw PE, Campbell PM, Boley JC, Alexander RA, Buschang PH. Prediction of Lip Response to Four First Premolar Extractions in White Female Adolescents and Adults. The Angle Orthodontist. 2009; 79(3): 413-421. doi:10.2319/050208-247.1
17. Oliver BM. The influence of lip thickness and strain on upper lip response to incisor retraction. American Journal of Orthodontics. 1982; 82(2): 141-149. doi:10.1016/0002-9416(82)90492-4.
18. Brock RA, Taylor RW, Buschang PH, Behrents RG. Ethnic differences in upper lip response to incisor retraction. American Journal of Orthodontics and Dentofacial Orthopedics. 2005; 127(6): 683-691. doi:10.1016/j.ajodo.2004.01.026.
19. Faysal Talass M, Tollaae L, Baker RC. Soft-tissue profile changes resulting from retraction of maxillary incisors. American Journal of Orthodontics and Dentofacial Orthopedics. 1987; 91(5): 385-394. doi:10.1016/0889-5406(87)90391-X.
20. Mirabella D, Quartarone L, Lombardo L, Guarneri A, Guarneri MP, Siciliani G. Assessment of lower lip changes following incisor displacement in 92 orthodontically-treated adults. International Orthodontics. 2012; 10(3): 289-310. doi:10.1016/j.ortho.2012.06.011.
21. Shirvani A, Sadeghian S, Abbasi S. Prediction of lip response to orthodontic treatment using a multivariable regression model. Dental Research Journal. 2016; 13(1): 38. doi:10.4103/1735-3327.174697.
2. Zide BM, McCarthy J. The mentalis muscle: an essential component of chin and lower lip position. Plastic Reconstruction Surgery. 1989; 83(3): 413-420.
3. Iared W, Koga Da Silva EM, Iared W, Rufino Macedo C. Esthetic perception of changes in facial profile resulting from orthodontic treatment with extraction of premolars. The Journal of the American Dental Association. 2017; 148(1): 9-16. doi:10.1016/j.adaj.2016.09.004.
4. Lu W, Zhang X, Mei L, et al. Orthodontic incisor retraction caused changes in the soft tissue chin area: a retrospective study. BMC Oral Health. 2020; 20(1): 108. doi:10.1186/s12903-020-01099-2.
5. Abeltins A, Jakobsone G. Soft tissue thickness changes after correcting Class III malocclusion with bimaxillar surgery. Stomatologija. 2011; 13(3): 87-91.
6. Milutinovic J, Stamenkovic Z, Zelic K, Marinkovic N, Nedeljkovic N. Soft tissue profile changes during treatment of patients with class II malocclusion. Serbian Archives of Medicine. 2022; 150(5-6): 261-266. doi:10.2298/SARH210913048M.
7. Singh RN. Changes in the soft tissue chin after orthodontic treatment. American Journal of Orthodontics and Dentofacial Orthopedics. 1990; 98(1): 41-46. doi:10.1016/0889-5406(90)70030-G.
8. Nguyễn Thị Bích Ngọc, Nguyễn Mạnh Hà, Tống Minh Sơn. Nhận xét kết quả điều trị sai lệch khớp cắn Angle I vẩu hai hàm có nhổ răng hàm nhỏ. Tạp chí Y Học Việt Nam. 2014; 425.
9. Le T, Tran P, Tran V. Factors that affect lip changes following incisor retraction in Vietnamese adults with a convex facial profile. Journal of Orthodontic Science. 2022; 11(1): 40. doi:10.4103/jos.jos_174_21.
10. Nguyễn Thị Bích Ngọc, Nguyễn Mạnh Hà, Tống Minh Sơn. Nghiên cứu sự thay đổi môi trên và xương hàm trên trên phim sọ nghiêng sau điều trị sai lệch khớp cắn Angle I vẩu hai hàm có nhổ 4 răng hàm nhỏ. Tạp chí Y Học Việt Nam. 2014; 424: 32-38.
11. De Bernabé PGG, Montiel-Company JM, Paredes-Gallardo V, Gandía-Franco JL, Bellot-Arcís C. Orthodontic treatment stability predictors: A retrospective longitudinal study. The Angle Orthodontist. 2017; 87(2): 223-229. doi:10.2319/053116-435.1.
12. Anic-Milosevic S, Mestrovic S, Prlić A, Slaj M. Proportions in the upper lip-lower lip-chin area of the lower face as determined by photogrammetric method. Journal of Cranio-Maxillofacial Surgery. 2010; 38(2): 90-95. doi:10.1016/j.jcms.2009.03.013.
13. Yashwant V. A, K. R, Arumugam E. Comparative evaluation of soft tissue changes in Class I borderline patients treated with extraction and nonextraction modalities. Dental Press Journal of Orthodontics. 2016; 21(4): 50-59. doi:10.1590/2177-6709.21.4.050-059.oar.
14. Kuhn M, Markic G, Doulis I, Göllner P, Patcas R, Hänggi MP. Effect of different incisor movements on the soft tissue profile measured in reference to a rough-surfaced palatal implant. American Journal of Orthodontics and Dentofacial Orthopedics. 2016; 149(3): 349-357. doi:10.1016/j.ajodo.2015.08.017.
15. Hayashida H, Ioi H, Nakata S, Takahashi I, Counts AL. Effects of retraction of anterior teeth and initial soft tissue variables on lip changes in Japanese adults. The European Journal of Orthodontics. 2011; 33(4): 419-426. doi:10.1093/ejo/cjq095.
16. Hodges A, Rossouw PE, Campbell PM, Boley JC, Alexander RA, Buschang PH. Prediction of Lip Response to Four First Premolar Extractions in White Female Adolescents and Adults. The Angle Orthodontist. 2009; 79(3): 413-421. doi:10.2319/050208-247.1
17. Oliver BM. The influence of lip thickness and strain on upper lip response to incisor retraction. American Journal of Orthodontics. 1982; 82(2): 141-149. doi:10.1016/0002-9416(82)90492-4.
18. Brock RA, Taylor RW, Buschang PH, Behrents RG. Ethnic differences in upper lip response to incisor retraction. American Journal of Orthodontics and Dentofacial Orthopedics. 2005; 127(6): 683-691. doi:10.1016/j.ajodo.2004.01.026.
19. Faysal Talass M, Tollaae L, Baker RC. Soft-tissue profile changes resulting from retraction of maxillary incisors. American Journal of Orthodontics and Dentofacial Orthopedics. 1987; 91(5): 385-394. doi:10.1016/0889-5406(87)90391-X.
20. Mirabella D, Quartarone L, Lombardo L, Guarneri A, Guarneri MP, Siciliani G. Assessment of lower lip changes following incisor displacement in 92 orthodontically-treated adults. International Orthodontics. 2012; 10(3): 289-310. doi:10.1016/j.ortho.2012.06.011.
21. Shirvani A, Sadeghian S, Abbasi S. Prediction of lip response to orthodontic treatment using a multivariable regression model. Dental Research Journal. 2016; 13(1): 38. doi:10.4103/1735-3327.174697.