Smartphone Addiction, Sleep Quality, and Temporomandibular Disorders Among Dental Students: A Cross-Sectional Analysis
Methods: A total of 259 participants completed validated questionnaires assessing the Smartphone Addiction Scale–Short Version (SAS-SV), Pittsburgh Sleep Quality Index, bruxism, and TMD symptoms.
Results: Nearly half of the students exhibited signs of smartphone addiction. Higher addiction scores were significantly correlated with poorer sleep quality and greater TMD severity, particularly among preclinical and doctoral students, while no significant relationship was found between bruxism and addiction scores.
Conclusions: These results imply that excessive smartphone use may silently impact mental and orofacial health by causing stress, sleep disturbances, and postural strain. Promoting healthier technology habits and addressing digital dependence could be key to protecting the well-being of future dental professionals.
1. Leow MQH, Chiang J, Chua TJX, Wang S, Tan NC. The relationship between smartphone addiction and sleep among medical students: A systematic review and meta-analysis. PLoS One. 2023;18(9):e0290724. doi:10.1371/journal.pone.0290724.
2. Statista Research Department. Number of smartphone users worldwide from 2016 to 2028. Statista. April 2024. Available from: https://www.statista.com/statistics/330695/number-of-smartphone-users-worldwide/
3. Loleska S, Pop-Jordanova N. Is Smartphone Addiction in the Younger Population a Public Health Problem? Pril (Makedon Akad Nauk Umet Odd Med Nauki). 2021;42(3):29-36. doi: 10.2478/prilozi-2021-0032.
4. Panova T, Carbonell X. Is smartphone addiction really an addiction? J Behav Addict. 2018;7(2):252-259. doi:10.1556/2006.7.2018.49.
5. Zou Z, Wang H, d’Oleire Uquillas F, Wang X, Ding J, Chen H. Definition of substance and non-substance addiction. In: Zou Z, ed. Substance and Non-substance Addiction. Singapore: Springer; 2017: pp. 21-41. doi: 10.1007/978-981-10-5562-1_2.
6. Lin YH, Lin YC, Lee YH, Lin PH, Lin SH, Chang LR. Proposed diagnostic criteria for smartphone addiction. PLoS One. 2016;11(11):e0163010. doi:10.1371/journal.pone.0163010.
7. Nikolic A, Bukurov B, Kocic I, et al. Smartphone addiction, sleep quality, depression, anxiety, and stress among medical students. Front Public Health. 2023;11:1252371. doi:10.3389/fpubh.2023.1252371.
8. Chang AM, Aeschbach D, Duffy JF, Czeisler CA. Evening use of light-emitting eReaders negatively affects sleep, circadian timing, and next-morning alertness. Proc Natl Acad Sci U S A. 2015;112(4):1232-1237. doi:10.1073/pnas.1418490112.
9. Exelmans L, Van den Bulck J. Bedtime mobile phone use and sleep in adults. Soc Sci Med. 2016;148:93-101. doi:10.1016/j.socscimed.2015.11.037.
10. Kroese FM, De Ridder DT, Evers C, Adriaanse MA. Bedtime procrastination: introducing a new area of procrastination. Front Psychol. 2014;5:611. doi: 10.3389/fpsyg.2014.00611.
11. Irwin MR. Sleep and inflammation: Partners in sickness and in health. Nat Rev Immunol. 2019;19(11):702-715. doi:10.1038/s41577-019-0190-z.
12. Aksaka N, Şahinkaya S, Yay E. Influence of digital behavior and sleep quality on periodontal status in adolescents: A cross-sectional study. BMC Oral Health. 2025;25(1):1374. doi: 10.1186/s12903-025-06749-x.
13. de Jesus Correia F, Soares JB, dos Anjos Matos R, Pithon KR, Ferreira LN, de Assunção PL. Smartphone addiction, musculoskeletal pain and functionality in university students: An observational study. Psychol Health Med. 2024;29(2):286-296. doi: 10.1080/13548506.2023.2176893.
14. Lobbezoo F, Ahlberg J, Glaros AG, Kato T, Koyano K, Lavigne GJ. Bruxism defined and graded: An international consensus. J Oral Rehabil. 2013;40(1):2-4. doi: 10.1111/joor.12011.
15. Manfredini D, Winocur E, Guarda-Nardini L, Paesani D, Lobbezoo F. Epidemiology of bruxism in adults: A systematic review of the literature. J Orofac Pain. 2013;27(2):99-110. doi: 10.11607/jop.921.
16. Kee IK, Byun JS, Jung JK, Choi JK. The presence of altered craniocervical posture and mobility in smartphone-addicted teenagers with temporomandibular disorders. J Phys Ther Sci. 2016;28(2):339-346. doi: 10.1589/jpts.28.339.
17. Osorio-Molina C, Martos-Cabrera MB, Membrive-Jiménez MJ, Vargas-Roman K, Suleiman-Martos N, Ortega-Campos E. Smartphone addiction, risk factors and its adverse effects in nursing students: A systematic review and meta-analysis. Nurse Educ Today. 2021;98:104741. doi: 10.1016/j.nedt.2020.104741.
18. Noyan CO, Darçin AE, Nurmedov S, Yilmaz O, Dilbaz N. Akıllı Telefon Bağımlılığı Ölçeğinin Kısa Formunun üniversite öğrencilerindeTürkçe geçerlilik ve güvenilirlik çalışması 8Validity and reliability of the Turkish version of the Smartphone Addiction Scale-Short Version among university students]. Anadolu Psikiyatri Derg. 2015;16(Suppl 1):73-81. doi: 10.5455/apd.176101. [Article in Turkish]
19. Buysse DJ, Reynolds CF, Monk TH, Berman SR, Kupfer DJ. The Pittsburgh Sleep Quality Index: A new instrument for psychiatric practice and research. Psychiatry Res. 1989;28(2):193-213. doi:10.1016/0165-1781(89)90047-4.
20. Ağargün MY, Kara H, Anlar Ö. Pittsburgh uyku kalitesi indeksinin geçerliği ve güvenirliği [The Validity and Reliability of the Pittsburgh Sleep Quality Index]. Turk Psikiyatri Derg. 1996;7(2):107-115. [Article in Turkish]
21. Kaya M, Koroglu A, Sahin O. The relationship of psychological status and sociodemographic factors with bruxism among undergraduate dental students: A national survey. Niger J Clin Pract. 2022 Jun;25(6):944-950. doi: 10.4103/njcp.njcp_1980_21.
22. Fonseca DM, Bonfante G, Valle AL, Freitas SFT. Diagnóstico pela anamnese da disfunção craniomandibular. Rev Gaucha Odontol. 1994;42(1):23-28.
23. Kaynak BA, Taş S, Salkın Y. The accuracy and reliability of the Turkish version of the Fonseca anamnestic index in temporomandibular disorders. Cranio. 2023;41(1):78-83. doi: 10.1080/08869634.2020.1812808.
24. Griffiths M. A ‘components’ model of addiction within a biopsychosocial framework. J Subst Use. 2005;10(4):191-197. doi: 10.1080/14659890500114359
25. De-Sola Gutiérrez J, Rodríguez de Fonseca F, Rubio G. Cell-phone addiction: A review. Front Psychiatry. 2016;7:175. doi: 10.3389/fpsyt.2016.00175.
26. Elhai JD, Dvorak RD, Levine JC, Hall BJ. Problematic smartphone use: A conceptual overview and systematic review of relations with anxiety and depression psychopathology. J Affect Disord. 2017;207:251-259. doi:10.1016/j.jad.2016.08.030.
27. Demirci K, Akgönül M, Akpinar A. Relationship of smartphone use severity with sleep quality, depression, and anxiety in university students. J Behav Addict. 2015;4(2):85-92. doi:10.1016/j.jad.2016.08.030.
28. Joshi SC. Sleep latency and sleep disturbances mediate the association between nighttime cell phone use and psychological well-being in college students. Sleep Biol Rhythms. 2022;20(3):431-443. doi: 10.1007/s41105-022-00388-3.
29. Regiani Bueno G, Garcia LF, Marques Gomes Bertolini SM, Rodrigues Lucena TF. The head down generation: Musculoskeletal symptoms and the use of smartphones among young university students. Telemed E Health. 2019;25(11):1049-1056. doi: 10.1089/tmj.2018.0231.
30. Thomée S, Härenstam A, Hagberg M. Mobile phone use and stress, sleep disturbances, and symptoms of depression among young adults: A prospective cohort study. BMC Public Health. 2011;11:66. doi: 10.1186/1471-2458-11-66.
31. Alageel AA, Alyahya RA, Bahatheq YA, et al. Smartphone addiction and associated factors among postgraduate students in an Arabic sample: A cross-sectional study. BMC Psychiatry. 2021;21(1):302. doi: 10.1186/s12888-021-03285-0.
32. Billieux J. Problematic use of the mobile phone: A literature review and a pathways model. Curr Psychiatry Rev. 2012;8(4):299-307. doi: 10.2174/157340012803520522.
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Article Information
- Article Type Research Article
- Submitted February 21, 2026
- Published March 14, 2026
- Issue 2026: Online First
- Section Research Article
