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Figure 1: Vestibula Evoked Myogenic Potentials (see chapter 'Complex Systems'

In this section of Masticationpedia we will deal with a much discussed topic in the field of prosthetic rehabilitation and in the diagnosis of Orofacial disorders including Temporomandibular dysfunctions. As we shall see, there is a line between proponents of the correlation between posture and the trigeminal system and those who refute the correlation. To confirm or deny this correlation, it would be enough to focus the attention on the VEMPs (Myogenic Vestibular Evoked Potentials) to understand the neuronal synergism but it would be necessary to pay equal attention to the synaptic modulations that occur in this phenomenon to understand how much we still know about the aforementioned trigeminal/vestibular correlation. Just think of the roll effect and evaluate the click-evoked cervical vestibular myogenic potentials (VEMPS) during the visual roll motion that elicited an illusory sensation of self-movement (i.e., vection). During vetion, there is an increase in cVEMP amplitude that is positively correlated with subjective reports of vection strength. The experimental conclusion is, therefore, that the simple subjective sensation of section is able to modulate the response of VEMPs and that this higher-level cortical phenomenon can also extend to short-lasting vestibulospinal responses. Therefore, regardless of who will be right over time, one must always be very careful in evaluating the symptoms and clinical signs reported by patients and not be influenced by more or less fashionable axioms which can generate even serious errors in the differential diagnosis such as in clinical case that we will present below.

 

Masticationpedia
Article by  Gianni Frisardi

 

Introduction

As an introduction to the section of chapters concerning 'Occlusion and Posture' we can partially report a concise introduction by Monika Nowak et al.[1] on which we will make the first conceptual reflections reported by our pensive Linus.

Posture is understood as the position of the human body and its orientation in space which requires the analysis and integration of stimuli from three systems: vision, vestibular and proprioception.[2][3] Over the years, numerous observations have been made on the factors influencing postural stability. [4][5][6][7][8] The role of the craniomandibular system is now being increasingly analyzed in relation to it. [9][10][11][12] Many theories attempt to explain the association between the masticatory organ and posture, including myofascial chains, trigeminal nerve activation or deactivation, and subsequent interaction in the brainstem.[13][14][15] However, this is a controversial topic in the scientific community. There is both evidence to support that relationship[16][17][18][19][20][21] and to refute it.[22][23][24][25]

Content supporting correlation

The authors of the scientific reports, who recognize the associations between the systems in question, give two indications for the possible interactions. The first, i.e. ascending disturbances, refers to the situation in which bad posture and disturbances of the peripheral structures (e.g. lower limbs), through myofascial neuromotor activities and the dura mater, functionally condition the cranio-mandibular structures. Conversely, a chain of descending disorders is present when anomalies of the craniomandibular region affect posture and body areas located more distally, including the pelvis and lower extremities.[13][26][27][28]

Question 2.jpg

And on this nothing to say because no one can deny an anatomical-functional correlation between vestibular systems, cerebellum, trigeminal and peripheral neuromotor system. This is not an opinion but a proven scientific observation already reported somewhere in Masticationpedia.

Figure 1: Vestibula Evoked Myogenic Potentials (see chapter 'Complex Systems'
Figure 1: Vestibula Evoked Myogenic Potentials (see chapter 'Complex Systems'

VEMPs, translated into Myogenic Vestibular Evoked Potentials are proof of this. Acoustic stimuli can evoke EMG reflex responses in the masseter muscle called Vestibular Evoked Myogenic Potentials (VEMPs). Although these findings have previously been attributed to activation of cochlear (high-intensity sound) receptors, these may also activate vestibular receptors. Because anatomical and physiological studies in both animals and humans have demonstrated that the masseter muscles are a target for vestibular inputs, the authors of this study reevaluated the vestibular contribution for masseter reflexes. This is a typical example of a basic level 'Complex System' as it consists of only two cranial nervous systems but, at the same time, they interact by activating monosynaptic and polysynaptic circuits (Figure 1).

Tmj disorders and posture

It has been shown that changes in the temporomandibular joint (TMJ) can have a direct impact on muscle activity in terms of posture, stability and physical performance.[17][29][30] However, there is a lack of high-quality studies using advanced measurement tools to better understand the phenomenon under investigation.[31] The study authors evaluated the impact of masticatory abnormalities on postural control and focuses on evaluating individuals with specific malocclusions that determine the anteroposterior position of the mandible. According to some researchers, malocclusion, like TMD, can affect the osteoarticular system of the whole body and become a source of persistent pain and favor the development and to become chronic of some postural defects. According to the cited authors, occlusal disturbances can lead to an altered stimulation of the periodontal proprioceptors, causing changes in the tension of the neck muscles and postural muscles and changes in the position of the head, followed by compensatory changes in the anatomical regions in their immediate vicinity. Over time, this can affect the posture, center of gravity position, or foot contact with the ground.[13][26][27][32][33]


Question 2.jpg

This could also be true but at the same time it should be demonstrable in order not to make diagnostic errors such as the one we will present in the section dedicated to 'Occlusion and Posture. Indeed, the patient we will present exclusively reported a masticatory disorder such as to require continuous rehabilitative reconstructions from his dentist. How can we demonstrate this occlusal disturbance at the neuromotor level such that it can also condition the vestibular system, the cerebellum and other brain centres?

Figure 2:Trigeminal electrophysiological responses.
Figure 2:Trigeminal electrophysiological responses.


Faced with a marked asymmetry such as the one shown in Figure 2, we certainly cannot deny a trigeminal disorder which is often related to a malocclusion. In Figure 2A we can see a slight asymmetry of the interferential EMG trace between the right and left masseter as well as the MEPs of the trigeminal root (Figure 2B) as well as the absence of the action potential on the right masseter in the mandibular reflex responses (Figure 2C ). As we will see in the chapters concerning this patient, these abnormal trigeminal electrophysiological responses have nothing to do with occlusal disturbances, much less postural disturbances.

However, there is still a gap in scientific knowledge on the relationship between craniofacial structure and spinal postural control in patients with malocclusion. Furthermore, the available documents show problems related to the small number of subjects, the small number of tested parameters or the selection of reliable measurement tools.[23][34][35]

Malocclusion, which these studies focus on, can result from abnormalities in the structure and alignment of the bones of the jaw and mandible in relation to each other or from an abnormal arrangement of the dental arches.


Bruxism and Posture

Angle suggested a classification of occlusion and malocclusion based on the anteroposterior position of the first molar and the position of the canines.[36][37]Malocclusion is often a congenital condition, resulting from hereditary or environmental factors. It is also caused by local factors, such as an abnormal pattern of breathing or postural defects, as well as oral parafunctions such as nail biting or teeth grinding (bruxism).[37]According to Lombardo's analyses, occlusal anomalies occur on average in 56% of the general population.[38] Their prevalence increases with age. Given their increasing prevalence in later age groups and the consequences they entail, it is reasonable to expect a large number of adult patients who will require complex and expensive multidisciplinary treatment.[38][39]

Question 2.jpg

Regarding bruxism[37] we certainly cannot speak of scientific certainties or take into consideration the incidence of bruxism in the population because, as described in the specific chapter concerning our patient 'Bruxer', he had a perfect occlusion and neuromuscular responses apparently up to standard if it hadn't been for the study of the case and have highlighted a neuronal hyperexcitability with the test of the rcMIR masseter inhibitory recovery cycle (Figure 3).

Figura 3: rcMIR in paziente bruxista
Figura 3: rcMIR in brusiste patient

Although the patient was in a state of neuronal hyperexcitability which affected the entire left leg with stiffness of the upper limbs, he never accused postural problems. With this we want to underline that although there are correlations between different cerebral association areas such as the vestibular, the trigeminal, the midbrain and so on, this does not give the clinician the right to base the diagnosis on these certainties. As, of course, we will repeat repeatedly throughout the 'Normal Science' section to justify the next section which will focus on the aspect of the anomalies and therefore the crisis of the paradigm.

Given the high proportion of patients with malocclusions [20][21] and the conflicting reports of these reports, [16][17][18][19][20][21][22][23][24][25] the need for further knowledge and analysis of individual malocclusions and associated musculoskeletal abnormalities under dynamic and static conditions is reasonable. There is still a lack of research on the effect of occlusion on postural stability and plantar pressure distribution during standing and walking in the same group of adults with Angle Class I, II, and III.

Contents to refute the correlation

As far as the authors contesting the correlation between occlusion and posture are concerned, we can report the results of Giuseppe Perinetti et al.[23] of 122 subjects, including 86 males and 36 females (age range 10.8 to 16.3 years) who tested negative for temporomandibular disorders or other conditions affecting the stomatognathic systems, with the exception of malocclusion. An assessment of dental occlusion included dentition stage, molar class, overjet, overbite, anterior and posterior crossbite, scissor bite, mandibular crowding, and dental midline deviation. Furthermore, body posture was recorded through static posturography using a vertical force platform. Recordings were performed under two conditions:

  1. mandibular rest position (RP)
  2. dental intercuspid position (ICP).

The conclusion was that all posturographic parameters showed great variability and were very similar between recording conditions. Furthermore, a limited number of weakly significant correlations, mainly for the overbite phase, were observed when using multivariate models.

The author's current findings were that regarding the use of posturography as a diagnostic aid for subjects affected by dental malocclusion, they do not support the existence of clinically relevant correlations between malocclusion typology and body posture.

Another interesting article in the group contesting the correlation comes from Benjamin Scharnweber et al.[24] examined 87 male subjects with a mean age of 25.23 ± 3.5 years (18 to 35 years). The dental models of the subjects were analyzed. Postural control and plantar pressure distribution were recorded from a weight bearing platform. Possible orthodontic and orthopedic influencing factors were determined from a medical history or questionnaire. All tests performed were randomized and repeated three times each for intercuspid position (ICP) and locked occlusion (BO).

In this study, the ICP occlusal position was found to increase body sway in the frontal (p ≤ 0.01) and sagittal (p ≤ 0.03) planes compared to the BO position, whereas all other 29 correlations were independent of position of the occlusion.

For both ICP or BO cases, angle therapy, midline shift, crossbite, or orthodontic therapy was found to have no influence on postural control or plantar pressure distribution (p > 0.05).

In conclusion, the author confirms that persistent dental parameters have no effect on postural sway. Furthermore, postural control and plantar pressure distribution were found to be independent postural criteria.

«After this due introduction to the 'Occlusion and Posture' section we can move on to the specific chapter concerning a patient with evident postulai problems.»
Bibliography & references
  1. ↑ Monika Nowak,,Joanna Golec, Aneta Wieczorek, and  Piotr Golec. Is There a Correlation between Dental Occlusion, Postural Stability and Selected Gait Parameters in Adults? Int J Environ Res Public Health. 2023 Jan; 20(2): 1652. Published online 2023 Jan 16. doi: 10.3390/ijerph20021652. PMCID: PMC9862361. PMID: 36674407
  2. ↑ Guez G. The Posture. In: Kandel E., Schwartz J., editors. Principles of Neural Science. Elsevier; Amsterdam, The Netherlands: 1991. pp. 612–623.
  3. ↑ Czaprowski D., Stoliński L., Tyrakowski M., Kozinoga M., Kotwicki T. Non-structural misalignments of body posture in the sagittal plane. Scoliosis Spinal Disord. 2018;13:6. doi: 10.1186/s13013-018-0151-5.
  4. ↑ Iwanenko J., Gurfinkel V. Human postural control. Front. Neurosci. 2018;12:17.
  5. ↑ Guerraz M., Bronstein A.M. Ocular versus extraocular control of posture and equilibrium. Neurophysiol. Clin. 2008;38:391–398. doi: 10.1016/j.neucli.2008.09.007.
  6. ↑ Hamaoui A., Frianta Y., Le Bozec S. Does increased muscular tension along the torso impair postural equilibrium in a standing posture? Gait Posture. 2011;34:457–461. doi: 10.1016/j.gaitpost.2011.06.017.
  7. ↑ Kolar P., Sulc J., Kyncl M., Sanda J., Neuwirth J., Bokarius A.V., Kriz J., Kobesova A. Stabilizing function of the diaphragm: Dynamic MRI and synchronized spirometric assessment. J. Appl. Physiol. 2010;109:1064–1071. doi: 10.1152/japplphysiol.01216.2009.
  8. ↑ Szczygieł E., Fudacz N., Golec J., Golec E. The impact of the position of the head on the functioning of the human body: A systematic review. Int. J. Occup. Med. Environ. Health. 2020;33:559–568. doi: 10.13075/ijomeh.1896.01585.
  9. ↑ Tardieu C., Dumitrescu M., Giraudeau A., Blanc J.L., Cheynet F., Borel L. Dental occlusion and postural control in adults. Neurosci. Lett. 2009;450:221–224. doi: 10.1016/j.neulet.2008.12.005.
  10. ↑ Munhoz W.C., Hsing W.T. Interrelations between orthostatic postural deviations and subjects’ age, sex, malocclusion, and specific signs and symptoms of functional pathologies of the temporomandibular system: A preliminary correlation and regression study. Cranio. 2014;32:175–186. doi: 10.1179/0886963414Z.00000000031.
  11. ↑ Pérez-Belloso A.J., Coheña-Jiménez M., Cabrera-Domínguez M.E., Galan-González A.F., Domínguez-Reyes A., Pabón-Carrasco M. Influence of dental malocclusion on body posture and foot posture in children: A cross-sectional study. Healthcare. 2020;8:485. doi: 10.3390/healthcare8040485.
  12. ↑ Amaricai E., Onofrei R.R., Suciu O., Marcauteanu C., Stoica E.T., Negruțiu M.L., David V.L., Sinescu C. Do different dental conditions influence the static plantar pressure and stabilometry in young adults? PLoS ONE. 2020;15:e0228816. doi: 10.1371/journal.pone.0228816.
  13. ↑ 13.0 13.1 13.2 Cabrera-Domínguez M.E., Domínguez-Reyes A., Pabón-Carrasco M., Pérez-Belloso A.J., Coheña-Jiménez M., Galán-González A.F. Dental malocclusion and its relation to the podal system. Front. Pediatr. 2021;9:654229. doi: 10.3389/fped.2021.654229.
  14. ↑ Myers T.  Anatomy Trains: Myofasziale Leitbahnen (für Manual- und Bewegungstherapeuten) Elsevier Health Sciences; Berlin, Germany: 2015.
  15. ↑ Pinganaud G., Bourcier F., Buisseret-Delmas C., Buisseret P. Primary trigeminal afferents to the vestibular nuclei in the rat: Existence of a collateral projection to the vestibulo-cerebellum. Neurosci. Lett. 1999;264:133–136. doi: 10.1016/S0304-3940(99)00179-2. [PubMed] [CrossRef] [Google Scholar] [Ref list]
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  17. ↑ 17.0 17.1 17.2 Manfredini D., Castroflorio T., Perinetti G., Guarda-Nardini L. Dental occlusion, body posture and temporomandibular disorders: Where we are now and where we are heading for. J. Oral Rehabil. 2012;39:463–471. doi: 10.1111/j.1365-2842.2012.02291.x.
  18. ↑ 18.0 18.1 Sakaguchi K., Mehta N.R., Abdallah E.F., Forgione A.G., Hirayama H., Kawasaki T., Yokoyama A. Examination of the relationship between mandibular position and body posture. Cranio. 2007;25:237–249. doi: 10.1179/crn.2007.037.
  19. ↑ 19.0 19.1 Cuccia A., Caradonna C. The relationship between the stomatognathic system and body posture. Clinics. 2009;64:61–63. doi: 10.1590/S1807-59322009000100011.
  20. ↑ 20.0 20.1 20.2 Marchena-Rodríguez A., Moreno-Morales N., Ramírez-Parga E., Labajo-Manzanares M.T., Luque-Suárez A., Gijon-Nogueron G. Relationship between foot posture and dental malocclusions in children aged 6 to 9 years. A cross-sectional study. Medicine. 2018;97:e0701. doi: 10.1097/MD.0000000000010701
  21. ↑ 21.0 21.1 21.2 Iacob S.M., Chisnoiu A.M., Buduru S.D., Berar A., Fluerasu M.I., Iacob I., Objelean A., Studnicska W., Viman L.M. Plantar pressure variations induced by experimental malocclusion—A pilot case series study. Healthcare. 2021;9:599. doi: 10.3390/healthcare9050599.
  22. ↑ 22.0 22.1 Michelotti A., Buonocore G., Farella M., Pellegrino G., Piergentili C., Altobelli S., Martina R. Postural stability and unilateral posterior crossbite: Is there a relationship? Neurosci. Lett. 2006;392:140–144. doi: 10.1016/j.neulet.2005.09.008.
  23. ↑ 23.0 23.1 23.2 23.3 Perinetti G., Contardo L., Silvestrini-Biavati A., Perdoni L., Castaldo A. Dental malocclusion and body posture in young subjects: A multiple regression study. Clinics. 2010;65:689–695. doi: 10.1590/S1807-59322010000700007.
  24. ↑ 24.0 24.1 24.2 Scharnweber B., Adjami F., Schuster G., Kopp S., Natrup J., Erbe C., Ohlendorf D. Influence of dental occlusion on postural control and plantar pressure distribution. Cranio. 2017;35:358–366. doi: 10.1080/08869634.2016.1244971.
  25. ↑ 25.0 25.1 Isaia B., Ravarotto M., Finotti P., Nogara M., Piran G., Gamberini J., Biz C., Masiero S., Frizziero A. Analysis of dental malocclusion and neuromotor control in young healthy subjects through new evaluation tools. J. Funct. Morphol. Kinesiol. 2019;4:5. doi: 10.3390/jfmk4010005.
  26. ↑ 26.0 26.1 Michalakis K.X., Kamalakidis S.N., Pissiotis A.L., Hirayama H. The Effect of clenching and occlusal instability on body weight distribution, assessed by a postural platform. BioMed Res. Int. 2019;2019:7342541. doi: 10.1155/2019/7342541.
  27. ↑ 27.0 27.1 Julià-Sánchez S., Álvarez-Herms J., Cirer-Sastre R., Corbi F., Burtscher M. The influence of dental occlusion on dynamic balance and muscular tone. Front. Physiol. 2020;10:1626. doi: 10.3389/fphys.2019.01626.
  28. ↑ Pacella E., Dari M., Giovannoni D., Mezio M., Caterini L., Costantini A. The relationship between occlusion and posture: A systematic review. Orthodontics. 2017;8:WMC005374.
  29. ↑ Moon H.J., Lee Y.K. The relationship between dental occlusion/temporomandibular joint status and general body health: Part 1. Dental occlusion and TMJ status exert an influence on general body health. J. Altern. Complement. Med. 2011;17:995–1000. doi: 10.1089/acm.2010.0739.
  30. ↑ Souza J.A., Pasinato F., Correa E.A., da Silva A.M. Global body posture and plantar pressure distribution in individuals with and without temporomandibular disorder: A preliminary study. J. Manip. Physiol. Ther. 2014;37:407–414.
  31. ↑ Ferrillo M., Marotta N., Giudice A., Calafiore D., Curci C., Fortunato L., Ammendolia A., de Sire A. Effects of occlusal splints on spinal posture in patients with temporomandibular disorders: A systematic review. Healthcare. 2022;10:739. doi: 10.3390/healthcare10040739.
  32. ↑ Saccucci M., Tettamanti L., Mummolo S., Polimeni A., Festa F., Tecco S. Scoliosis and dental occlusion: A review of the literature. Scoliosis. 2011;6:1–15. doi: 10.1186/1748-7161-6-15.
  33. ↑ Sforza C., Tartaglia G.M., Solimene U., Morgan V., Kaspranskiy R.R., Ferrario V.F. Occlusion, sternocleidomastoid muscle activity, and body sway: A pilot study in male astronauts. Cranio. 2006;24:43–49. doi: 10.1179/crn.2006.008
  34. ↑ Michelotti A., Buonocore G., Manzo P., Pellegrino G., Farella M. Dental occlusion and posture: An overview. Prog. Orthod. 2011;12:53–58. doi: 10.1016/j.pio.2010.09.010.
  35. ↑ Ishizawa T., Xu H., Onodera K., Ooya K. Weight distributions on soles of feet in the primary and early permanent dentition with normal occlusion. J. Clin. Pediatr. Dent. 2005;30:165–168. doi: 10.17796/jcpd.30.2.8x4727137678061m.
  36. ↑ Bernabé E., Sheiham A., de Oliveira C.M. Condition-specific impacts on quality of life attributed to malocclusion by adolescents with normal occlusion and Class I, II and III malocclusion. Angle Orthod. 2008;78:977–982. doi: 10.2319/091707-444.1
  37. ↑ 37.0 37.1 37.2 Okeson J.P.  Management of Temporomandibular Disorders and Occlusion.Mosby; Maryland Heights, MO, USA: 2019.
  38. ↑ 38.0 38.1 Lombardo G., Vena F., Negr P., Pagano S., Barilotti C., Paglia L., Colombo S., Orso M., Cianetti S. Worldwide prevalence of malocclusion in the different stages of dentition: A systematic review and meta-analysis. Eur. J. Paediatr. Dent. 2020;21:115–122.
  39. ↑ Kawala B., Szumielewicz M., Kozanecka A. Are orthodontists still needed? Epidemiology of malocclusion among polish children and teenagers in last 15 years. Dent. Med. Probl. 2009;46:273–278
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