Electromyographic Activity Changes of Jaw-Closing Muscles in Patients with Different Occlusion Schemes after Fixed Prosthetic Restoration

Evangelos Ximinis 1  and Dimitrios Tortopidis 2
  • 1 Department of Prosthodontics, School of Dentistry, Aristotle University of Thessaloniki, Thessaloniki, Greece
  • 2 Department of Prosthodontics, School of Dentistry, Aristotle University of Thessaloniki, Thessaloniki, Greece


Background/Aim: To investigate the electromyographic (EMG) activity changes of jaw-closing muscles in patients with different occlusion schemes and posterior edentulous span, after the placement of teeth-supported fixed partial denture (FPD).

Material and Methods: The study sample consisted of 20 patients (10 men and 10 women, the mean age being 50 years) with a posterior edentulous area that includes two missing premolars or one premolar and one molar. The participants were divided into two groups with different occlusion schemes: canine-guided occlusion (CGO) and group function occlusion (GFO). The metal-ceramic FPD were fabricated according to the clinic-standardized protocol. EMG activities of masseter and anterior temporalis patients’ muscles were recorded with bipolar surface electrodes during maximal voluntary clenching. EMG evaluation was repeated twice: (T1) before the fabrication of FPD (T2) after eight weeks of FPD cementation and intraoral functioning of restoration. The data were subjected to Analysis of Variance–ANOVA within the methodological framework of the General Linear Models with Repeated Measures. The Bonferroni test was used to compare multiple mean measures. Statistical analysis was conducted with SPSS ver. 11.5. The level of significance was predefined at a=0.05.

Results: Group 1 with CGO presented significantly higher levels of masseter (mean maximum EMG average before 79.36μV and 139.68μV after) and temporalis (mean maximum EMG average before 79.07μV and 149.37μV after) EMG activity after FPD placement. Group 2 with GFO also showed significantly higher levels of masseter (mean maximum EMG average before 61.57μV and 165.30μV after) and temporalis (mean maximum EMG average before 56.94μV and 133.08μV after) EMG activity after the prosthetic restoration.

Conclusions: It may be concluded that fixed prosthetic restoration, in both patients with canine-guided and group function occlusion, results in increased EMG jaw-muscle activity.

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  • 1. Bates JF, Stafford GD, Harrison A. Masticatory function - a review of the literature. III. Masticatory performance and efficiency. J Oral Rehabil, 1976;3:57-67.

  • 2. Bakke M, Michler L, Möller E. Occlusal control of mandibular elevator muscles. Scand J Dent Res, 1992;100:284-91.

  • 3. Ringqvist M. Fiber types in human masticatory muscles. Relation to function. Scand J Dent Res, 1974;82:333-355.

  • 4. Lavigne G, Kim JS, Valliquette C, Lund JP. Evidence that periodontal pressoreceptors provide positive feedback to jaw closing muscles during mastication. J Neurophysiol, 1987;58:342-358.

  • 5. Ikebe K, Matsuda K, Kagawa R, Enoki K, Okada T, Yoshida M, Maeda Y. Masticatory performance in older subjects with varying degrees of tooth loss. J Dent, 2012;40:71-76.

  • 6. Castroflorio T, Bracco P, Farina D. Surface electromyography in the assessment of jaw elevator muscles. J Oral Rehabil, 2008;35:638-645.

  • 7. Ahlberg K, Savolainen A, Paju S, Hublin C, Partinen M, Könönen M, Ahlberg J. Bruxism and sleep efficiency measured at home with wireless devices. J Oral Rehabil, 2008;35:567-571.

  • 8. Dahlström L. Electromyographic studies of craniomandibular disorders: a review of the literature. J Oral Rehabil, 1989;16:1-20.

  • 9. Visser A, Kroon GW, Naeije M, Hansson TL. EMG differences between weak and strong myogenous CMD patients and healthy controls. J Oral Rehabil, 1995;22:429-434.

  • 10. Tortopidis D, Lyons MF, Baxendale RH. Bite force, endurance and masseter muscle fatigue in healthy edentulous subjects and those with TMD. J Oral Rehabil, 1999;26:321-328.

  • 11. Basmajian JV. Biofeedback in medical practice. Can Med Assoc J, 1978;119:8-10.

  • 12. Ferrario VF, Tartaglia GM, Galletta A, Grassi GP, Sforza C. The influence of occlusion on jaw and neck muscle activity: a surface EMG study in healthy young adults. J Oral Rehabil, 2006;33:341-348.

  • 13. Shupe RJ, Mohamed SE, Christensen LV, Finger IM, Weinberg R. Effects of occlusal guidance on jaw muscle activity. J Prosthet Dent, 1984;51:811-818.

  • 14. Akören AC, Karaağaçlioğlu L. Comparison of the electromyographic activity of individuals with canine guidance and group function occlusion. J Oral Rehabil, 1995;22:73-77.

  • 15. Tartaglia GM, Testori T, Pallavera A, Marelli B, Sforza C. Electromyographic analysis of masticatory and neck muscles in subjects with natural dentition, teeth-supported and implant-supported prostheses. Clin Oral Implants Res, 2008;19:1081-1088.

  • 16. Okano N, Baba K, Akishige S, Ohyama T. The influence of altered occlusal guidance on condylar displacement. J Oral Rehabil, 2002;29:1091-1098.

  • 17. Belser US, Hannam AG. The influence of altered working-side occlusal guidance on masticatory muscles and related jaw movement. J Prosthet Dent, 198;53:406-413.

  • 18. Okano N, Baba K, Igarashi Y. Influence of altered occlusal guidance on masticatory muscle activity during clenching. J Oral Rehabil, 2007;34:679-684.

  • 19. Ferro KJ. The glossary of prosthodontic terms. J Prosthet Dent, 2005;94:10-92.

  • 20. Abduo J, Tennant M. Impact of lateral occlusion schemes: A systematic review. J Prosthet Dent, 2015;114:193-204.

  • 21. Shillingburg HT et al. Fundamentals of fixed prosthodontics. 4th Edition Chichago: Quintessence Publishing, 2012; pp:5-150.

  • 22. Goodacre CJ, Campagni WV, Aquilino SA. Tooth preparations for complete crowns: an art form based on scientific principles. J Prosthet Dent, 2001;85:363-376.

  • 23. Rosenstiel SF, Land MF, Fujimoto J. Contemporary Fixed Prosthodontics. 4th ed. St. Louis: Mosby; 2006; pp:209-285.

  • 24. Yemm R. The orderly recruitment of motor units of the masseter and temporal muscles during voluntary isometric contraction in man. J Physiol, 1977;265:163-174.

  • 25. Roy SH, De Luca CJ, Schneider J. Effects of electrode location on myoelectric conduction velocity and median frequency estimates. J Appl Physiol, 1986;61:1510-1517.

  • 26. Georgiakaki I, Tortopidis D, Garefis P, Kiliaridis S. Ultrasonographic thickness and electromyographic activity of masseter muscle of human females. J Oral Rehabil, 2007;34:121-128.

  • 27. Ferrario VF, Sforza C. Coordinated electromyographic activity of the human masseter and temporalis anterior muscles during mastication. Eur J Oral Sci, 1996;104:511-517.

  • 28. Hugger A, Hugger S, Schindler HJ. Surface electromyography of the masticatory muscles for application in dental practice. Current evidence and future developments. Int J Comput Dent, 2008;11:81-106.

  • 29. Wozniak K, Piatkowska D, Lipski M, Mehr K. Surface electromyography in orthodontics - a literature review. Med Sci Monit, 2013;19:416-423.

  • 30. Svensson P, Graven-Nielsen T. Craniofacial muscle pain: review of mechanisms and clinical manifestations. J Orofac Pain, 2001;15:117-145.

  • 31. Suvinen TI, Kemppainen P. Review of clinical EMG studies related to muscle and occlusal factors in healthy and TMD subjects. J Oral Rehabil, 2007;34:631-644.

  • 32. Lund JP, Widmer CG. Evaluation of the use of surface electromyography in the diagnosis, documentation, and treatment of dental patients. J Craniomandib, 1989;3:125-137.

  • 33. Suvinen TI, Malmberg J, Forster C, Kemppainen P. Postural and dynamic masseter and anterior temporalis muscle EMG repeatability in serial assessments. J Oral Rehabil, 2009;36:814-820.

  • 34. Sforza C, Rosati R, De Menezes M, Musto F, Toma M. EMG analysis of trapezius and masticatory muscles: experimental protocol and data reproducibility. J Oral Rehabil, 2011;38:648-654.

  • 35. Walker SM, Schrodt GR. I segment lengths and thin filament periods in skeletal muscle fibres of the Rhesus monkey and human. Anatomical Record, 1973;178:63-82.

  • 36. Manns A, Miralles R, Palazzi C. EMG, bite force, and elongation of the masseter muscle under isometric voluntary contractions and variations of vertical dimension. J Prosthet Dent, 1979;42:674-682.

  • 37. Van Eijden TM, Raadsheer MC. Heterogeneity of fiber and sarcomere length in the human masseter muscle. Anat Rec, 1992;232:78-84.

  • 38. Botelho AL, Melchior Mde O, da Silva AM, da Silva MA. Electromyographic evaluation of neuromuscular coordination of subject after orthodontic intervention. Cranio, 2009;27:152-158.

  • 39. Forrester SE, Presswood RG, Toy AC, Pain MT. Occlusal measurement method can affect SEMG activity during occlusion. J Oral Rehabil, 2011;38:655-660.

  • 40. Mac Donald JW, Hannam AG. Relationship between occlusal contacts and jaw-closing muscle activity during tooth clenching: Part I. J Prosthet Dent, 1984;52:718-728.

  • 41. Ferrario VF, Serrao G, Dellavia C, Caruso E, Sforza C. Relationship between the number of occlusal contacts and masticatory muscle activity in healthy young adults. Cranio, 2002;20:91-98.

  • 42. Bakke M. Mandibular elevator muscles: physiology, action, and effect of dental occlusion. Scand J Dent Res, 1993;101:314-331.

  • 43. Kerstein RB. Combining technologies: a computerized occlusal analysis system synchronized with a computerized electromyography system. Cranio, 2004;22:96-109.

  • 44. Haraldson T, Carlsson GE, Ingervall B. Functional state, bite force and postural muscle activity in patients with osseointegrated oral implant bridges. Acta Odontol Scand, 1979;37:195-206.

  • 45. Jacobs R, van Steenberghe D. Masseter muscle fatigue during sustained clenching in subjects with complete dentures, implant-supported prostheses, and natural teeth. J Prosthet Dent, 1993;69:305-313.

  • 46. Bersani E, Regalo SC, Siessere S, Santos CM, Chimello DT, De Oliveira RH, Semprini M. Implant-supported prosthesis following Brånemark protocol on electromyography of masticatory muscles. J Oral Rehabil, 2011;38:668-673.

  • 47. von der Gracht I, Derks A, Haselhuhn K, Wolfart S. EMG correlations of edentulous patients with implant overdentures and fixed dental prostheses compared to conventional complete dentures and dentates: a systematic review and meta-analysis. Clin Oral Implants Res, 2017;28:765-773.

  • 48. Wood WW, Tobias DL. EMG response to alteration of tooth contacts on occlusal splints during maximal clenching. J Prosthet Dent, 1984;51:394-396.


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