Coincidence of Maxillary Dental Midline with the Ala-Canthus Intersection Point Among Dental Students
DOI:
https://doi.org/10.37762/jgmds.13-3.851Keywords:
Coincidence, Dental midline, Ala-Canthus Lines, Intersection PointAbstract
ABSTRACT
OBJECTIVES
This study aimed to determine the frequency of dental midline coincidence with the ala–canthus intersection point.
METHODOLOGY
A cross-sectional study was conducted at the department of Prosthodontics, Khyber College of Dentistry, Peshawar, from January to June 2025. A total of 86 dental students, both male and female, were included in the study. Facial portrait photographs were taken with a DSLR camera while smiling. Photoshop software CC 2019 version 20.0 was used to analyze the coincidence of the dental midline with the intersection point of ala-canthus lines. Data were analyzed using SPSS version 22.0. Associations between categorical variables were assessed using the Chi-square test or Fisher’s exact test, where appropriate. A p-value < 0.05 was considered statistically significant.
RESULTS
The coincidence of the maxillary dental midline with the ala–canthus intersection point was observed in 33.72% (29/86) of participants.
CONCLUSION
Maxillary dental midline coincidence was observed in only one-third of participants. The dental midlines were coincident with the intersection point of ala-canthus lines in less than half of the sample.
Downloads
Metrics
References
Singh A, Nagpal A, Vats R, Kaur M, Kaur B, Mahajan M. The relationship of facial and dental midlines with various anatomic landmarks of face and oral cavity. J Dent Oral Hyg. 2016;8(5):1–7. https://doi.org/10.5897/JDOH2016.0191 DOI: https://doi.org/10.5897/JDOH2016.0191
Salman OL, Al Khafaji SY, Wais ZM. Prevalence of dental midline shifting among 7- to 15-year-old children in Babylon, Iraq. J Orthod Sci. 2023;12:68. https://doi.org/10.4103/jos.jos_62_23 PMID: 38058583 DOI: https://doi.org/10.4103/jos.jos_24_23
Sayahpour B, Eslami S, Usherenko R, Jamilian A, Gonzalez Balut M, Plein N, et al. Impact of dental midline shift on the perception of facial attractiveness in young adults. J Clin Med. 2024;13(13):3944. https://doi.org/10.3390/jcm13133944 PMID: 38999686 DOI: https://doi.org/10.3390/jcm13133944
Martins JM, Costa LG, Carvalho AL, Manso MC, Gavinha S, Herrero-Climent M, et al. The impact of dental midline on asymmetric faces: perspective of laypersons and dentists. Int J Environ Res Public Health. 2021;18(24):12904. https://doi.org/10.3390/ijerph182412904 PMID: 34948914 DOI: https://doi.org/10.3390/ijerph182412904
Reviansyah FH, Ristin AD, Almughni WH, Yolanda Y, Takarini V, Susilawati S, et al. Eco-friendly approaches to enhance dental aesthetics and patient satisfaction using digital smile design: a systematic review. Clin Cosmet Investig Dent. 2025;17:391–404. https://doi.org/10.2147/CCIDE.S535436 PMID: 40306483 DOI: https://doi.org/10.2147/CCIDE.S535436
Ko EWC, Huang CS, Lin CH, Chen YR. Orthodontic perspective for face asymmetry correction. Symmetry (Basel). 2022;14(9):1822. https://doi.org/10.3390/sym14091822 DOI: https://doi.org/10.3390/sym14091822
Mahdi NA, Al-Joubri SK, Abdulredha NJ, Jasim AA. Prevalence of dental midline deviations in a sample of young Iraqi adults. J Orthod Sci. 2025;14:22. https://doi.org/10.4103/jos.jos_148_24 (PMID pending) DOI: https://doi.org/10.4103/jos.jos_134_24
Maaz M, Tahir K, Fida M, Sukhia RH. Facial flow line and its effect on dental midline deviation in an Asian population: a cross-sectional study. J Orthod Sci. 2023;12:66. https://doi.org/10.4103/jos.jos_94_23 PMID: 38058581 DOI: https://doi.org/10.4103/jos.jos_85_22
Williams RP, Rinchuse DJ, Zullo TG. Perceptions of midline deviations among different facial types. Am J Orthod Dentofacial Orthop. 2014;145(2):249–55. https://doi.org/10.1016/j.ajodo.2013.02.034 PMID: 24485734 DOI: https://doi.org/10.1016/j.ajodo.2013.02.034
Khan MF, Khezran Q, Sajid N. Coincidence of facial midline with dental midline. Pak Oral Dent J. 2014;34(2):355–7
Rakhshan V, Atashkar N, Rekabi A, Paydar Z, Hashemi Ashtiani A, Ashoori N, et al. Effects of facial forms and midline deviations on female facial beauty according to laypeople, orthodontists, and restorative dentists. Sci Rep. 2024;14(1):20900. https://doi.org/10.1038/s41598-024-71262-0 PMID: 39228787 DOI: https://doi.org/10.1038/s41598-024-71262-0
Faiz N, Jessy P, Nasim I, Maiti S. Evaluation of coincidence between facial and dental midlines in relation to esthetics: a retrospective study. Int J Dent Oral Sci. 2020;7(12):1216–21. https://doi.org/10.19070/2377-8075-20000241 DOI: https://doi.org/10.19070/2377-8075-20000240
Niraula N, Acharya R, Humagain M, Khurshid Z, Adanir N, Rokaya D. Dental-facial midline: an esthetic-based classification. Open Dent J. 2021;15(1):95–100. https://doi.org/10.2174/1874210602115010095 PMID: 34188470 DOI: https://doi.org/10.2174/1874210602115010404
Eskelsen E, Fernandes CB, Pelogia F, Cunha LG, Pallos D, Neisser MP, et al. Concurrence between the maxillary midline and bisector to the interpupillary line. J Esthet Restor Dent. 2009;21(1):37–41. https://doi.org/10.1111/j.1708-8240.2008.00229.x PMID: 19250546 DOI: https://doi.org/10.1111/j.1708-8240.2008.00229.x
Maharjan S, Rajbhandari A, Pradhan R, Bajracharya M, Manandhar P, Pant BD. Evaluation of facial and dental midline discrepancies in Nepalese population. Europasian J Med Sci. 2020;2(2):51–5. https://doi.org/10.46405/ejms.v2i1.37 DOI: https://doi.org/10.46405/ejms.v2i1.37
Melo M, Ata-Ali J, Ata-Ali F, Bulsei M, Grella P, Cobo T, et al. Evaluation of the maxillary midline, curve of the upper lip, smile line and tooth shape: a prospective study of 140 Caucasian patients. BMC Oral Health. 2020;20(1):42. https://doi.org/10.1186/s12903-020-1031-y PMID: 32046729 DOI: https://doi.org/10.1186/s12903-020-1031-y
Chahuara-Ramírez YR, Arriola-Guillén LE. Coincidence of the facial and maxillary dental midlines in the Peruvian population: a cross-sectional study. J Clin Exp Dent. 2024;16(9):e1053–8. https://doi.org/10.4317/jced.61822 PMID: 39210831 DOI: https://doi.org/10.4317/jced.61930
Khan MF, Sharaz S, Shariff M, et al. Discord between the facial and maxillary midline and intermaxillary midline among the population of Asir, Saudi Arabia. Pesqui Bras Odontopediatria Clin Integr. 2019;19:e4668. https://doi.org/10.4034/PBOCI.2019.191.132 DOI: https://doi.org/10.4034/PBOCI.2019.191.132
Maiti S, Mittal S, Kalra S, Kashyap S, Sharma P, Rani V. Alignment of maxillary and mandibular midlines in dentate individuals: a cross-sectional analysis. J Clin Diagn Res. 2024;18(7):ZC01–ZC04. https://doi.org/10.7860/JCDR/2024/69696.19583 DOI: https://doi.org/10.7860/JCDR/2024/69696.19583
Kostić M, Đorđević NS, Gligorijević N, Jovanović M, Đerlek E, Todorović K, et al. Correlation theory of the maxillary central incisor, face and dental arch shape in the Serbian population. Medicina (Kaunas). 2023;59(12):2142. https://doi.org/10.3390/medicina59122142 PMID: 38138884 DOI: https://doi.org/10.3390/medicina59122142
Shankar DD, Chandra V, Anjan R, Kundra S, Chandra S, Bhatia A, et al. Correlation of facial and dental midlines in dentate population of North Bihar. J Popul Ther Clin Pharmacol. 2023;30(2):472–7. https://doi.org/10.53555/jptcp.v30i2.2685
Published
How to Cite
Issue
Section
License
Copyright (c) 2026 Sara Farid, Syed Nasir Shah, Asif Ullah Khan, Aneela Jamshaid, Sana Saleem Khan, Humna Ali
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
