Dentist № 4 (59) – 2025, pp. 34-37 SCIENTIFIC PUBLICATION
Features of the curve of Spee in orthodontic practice
Ya.I. Timchuka, M.V. Danilyukb, А.А. Belayaс
aMD, PhD, Associate Professor, Belarusian State Medical University, Minsk, Belarus
bBelarusian State Medical University, Minsk, Belarus
c8th City Clinical Dental Clinic, Minsk, Belarus
https://doi.org/10.32993/dentist.2025.4(59).7
ABSTRACT
The aim of the study. To study the features of the curve of Spee, to identify the correlation of its depth with the type of closure of the dental arches and the depth of the vertical incisor overlap.
Objects and methods. Clinical and anthropometric diagnostics of 20 patients aged 18 to 25 years, who have not previously undergone orthodontic treatment and have no history of adentia.
Results and discussion. Anthropometric measurements of gypsum jaw models of 20 examined patients showed that all 5 known measurement methods revealed the same correlation between the depth of the curve of Spee and the type of dental occlusion, as well as the depth of incisal overlap. The deepest curve of Spee is observed in patients with distal bite and deep incisal overlap, the shallowest ‒ in patients with mesial type of occlusion and minimal incisal overlap.
Conclusion. Analysis of the obtained data indicates that the choice of method for measuring the depth of the curve of Spee can be variable and adapted to specific clinical conditions. It is important to consider the type of bite and the degree of incisal overlap, as these parameters influence the shape and depth of the curve. Thorough and timely diagnosis of the depth of the curve of Spee allows more accurate prediction of the dynamics of orthodontic changes, which reduces the likelihood of treatment errors, promotes earlier correction, and prevents the development of complications associated with temporomandibular joint dysfunction. Constant monitoring of this parameter increases the effectiveness of therapeutic measures, helps avoid adverse consequences, and contributes to achieving stable and long-term clinical results.
Keywords: curve of Spee, diagnosis, type of bite
References
- Abolmasov N.N., Morozova G.A. Okkljuzija ‒ odno iz vedushhih zven’ev funkcional’noj biosistemy zhevatel’nogo processa [Occlusion as one of the key links in the functional biosystem of the chewing process]. Mat. XIV i XV Vserossijskoj nauchno-prakticheskoj konferencii. – Materials of the XIV and XV All-Russian Scientific and Practical Conference. M.: Biznes Centr “Stomatologija” i dr.. 2005, pp. 53–55.
- Almutawa N. The development and clinical significance of the curve of Spee. Advances in Oral and Dental Sciences. 2023, 7, pp. 1–10.
- Baldridge D.W. Leveling the curve of Spee: its effect on mandibular arch length. Journal of Practical Orthodontics. 1969, vol. 3, no. 1, pp. 26–41.
- Bishara S.E., Jakobsen J.R., Treder J.E., Stasi M.J. Changes in the maxillary and mandibular tooth size-arch length relationship from early adolescence to early adulthood: a longitudinal study. American Journal of Orthodontics and Dentofacial Orthopedics. 1989, vol. 95, no. 1, pp. 46–59. doi: 1016/0889-5406(89)90135-2
- Braun S., Hnat W.P., Johnson B.E. The curve of Spee revisited. American Journal of Orthodontics and Dentofacial Orthopedics. 1996, vol. 110, no. 3, pp. 206–210. doi: 10.1016/s0889-5406(96)70110-5
- Kumar K.P.S., Tamizharasi S. Significance of curve of Spee: an orthodontic review. Journal of International Oral Health. 2012, vol. 4, no. 2, pp. 85– doi: 10.5005/jp-journals-10005-1156
- Marshall S.D., et al. Development of the curve of Spee. American Journal of Orthodontics and Dentofacial Orthopedics. 2008, vol. 134, no. 3, pp. 344–352. doi: 10.1016/j.ajodo.2006.10.037
- Sondhi A., Cleall J.F., BeGole E.A. Dimensional changes in the dental arches of orthodontically treated cases. Am. J. Orthod. 1980, vol. 77, no. 1, pp. 60–74. doi: 10.1016/0002-9416(80)90224-9
Correspondence to: E-mail: belayaa-ann@yandex.by