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== Abstract ==
== Abstract ==


Il sistema masticatorio — comprendente denti, occlusione, muscoli, articolazioni temporo-mandibolari e reti di controllo nervoso centrale e periferico — non può essere adeguatamente descritto come un semplice meccanismo biomeccanico. Al contrario, esso deve essere interpretato come un '''sistema complesso adattativo''', nel quale la funzione emerge dall’interazione non lineare tra componenti morfologiche, neuromuscolari e neurofisiologiche. In questo contesto, molte manifestazioni cliniche che risultano “anomale” rispetto ai modelli tradizionali non rappresentano errori o fallimenti terapeutici, ma veri e propri '''segnali di crisi paradigmatica''', nel senso descritto da Thomas Kuhn.
The masticatory system — including teeth, occlusion, muscles, temporomandibular joints, and central and peripheral neural control networks — cannot be adequately described as a simple biomechanical mechanism. Rather, it must be interpreted as a '''complex adaptive system''', in which function emerges from non-linear interactions among morphological, neuromuscular, and neurophysiological components. Within this framework, many clinical manifestations that appear “abnormal” according to traditional models do not represent errors or therapeutic failures, but instead constitute genuine '''signals of paradigmatic crisis''', in the sense originally described by Thomas Kuhn.


L’approccio classico alla diagnosi e al trattamento dei disordini masticatori è stato storicamente fondato su categorie prevalentemente morfologiche, in particolare sul concetto di “malocclusione”. Tuttavia, l’esperienza clinica e la crescente evidenza sperimentale mostrano che la forma occlusale, considerata isolatamente, non è un predittore affidabile della funzione. Pazienti con discrepanze occlusali evidenti possono presentare un equilibrio neuromuscolare stabile, mentre soggetti con assetti morfologicamente corretti possono sviluppare dolore, instabilità e recidive funzionali. Per questa ragione, Masticationpedia propone il passaggio concettuale da “malocclusioni” a “'''dismorfismi occlusali'''”, sottolineando la distinzione tra descrizione morfologica e significato funzionale.
The classical approach to the diagnosis and treatment of masticatory disorders has historically been based on predominantly morphological categories, particularly the concept of “malocclusion.” However, clinical experience and increasing experimental evidence demonstrate that occlusal form, when considered in isolation, is not a reliable predictor of function. Patients with marked occlusal discrepancies may exhibit stable neuromuscular balance, whereas individuals with morphologically “correct” occlusions may develop pain, instability, and functional relapse. For this reason, Masticationpedia proposes a conceptual shift from “malocclusions” to “'''occlusal dysmorphisms'''”, emphasizing the distinction between morphological description and functional meaning.


I test elettrofisiologici — quali i riflessi mandibolari, i potenziali evocati motori e il periodo silente meccanico — rappresentano strumenti fondamentali per esplorare il livello funzionale del sistema masticatorio. Essi consentono di valutare in modo oggettivo la simmetria neuromuscolare, il controllo riflesso e l’integrazione tra periferia e sistema nervoso centrale. Le evidenze mostrate indicano che una '''simmetria funzionale''' può essere mantenuta anche in presenza di dismorfismi occlusali marcati, grazie a meccanismi adattativi neuroplastici che stabilizzano il sistema nel tempo.
Electrophysiological tests — including mandibular reflexes, motor evoked potentials, and the mechanical silent period — represent fundamental tools for investigating the functional level of the masticatory system. They allow objective assessment of neuromuscular symmetry, reflex control, and the integration between peripheral structures and the central nervous system. The evidence presented shows that '''functional symmetry''' can be preserved even in the presence of pronounced occlusal dysmorphisms, through adaptive neuroplastic mechanisms that stabilize the system over time.


Questa prospettiva ha implicazioni cliniche decisive. La riabilitazione masticatoria — che includa ortodonzia, protesi o chirurgia — non può più essere orientata esclusivamente alla ricerca di una stabilità occlusale statica. Al contrario, deve mirare a una '''stabilità funzionale dinamica''', verificabile attraverso parametri neurofisiologici riproducibili. L’assenza di tale integrazione rappresenta una delle principali cause di fallimenti terapeutici e di recidive tardive, spesso erroneamente attribuite a “scarsa compliance” del paziente.
This perspective has decisive clinical implications. Masticatory rehabilitation — whether orthodontic, prosthetic, or surgical — can no longer be oriented exclusively toward achieving static occlusal stability. Instead, it must aim for '''dynamic functional stability''', verifiable through reproducible neurophysiological parameters. The absence of such integration represents one of the main causes of therapeutic failure and late relapse, often erroneously attributed to poor patient compliance.


In questo quadro si colloca il modello OrthoNeuroGnathodontico, che integra valutazione morfologica, analisi funzionale ed elettrofisiologia clinica in un’unica strategia diagnostico-terapeutica. Tale modello non si limita a correggere la forma, ma riconosce il ruolo centrale del sistema nervoso nel mantenimento dell’equilibrio masticatorio. L’adozione di criteri funzionali misurabili consente così di superare un approccio riduzionista e di allineare la pratica clinica ai principi della medicina dei sistemi complessi, aprendo la strada a trattamenti più stabili, predittivi e scientificamente fondati.
Within this framework, the OrthoNeuroGnathodontic model emerges as an integrated diagnostic-therapeutic strategy combining morphological evaluation, functional analysis, and clinical electrophysiology. This model does not merely correct form, but recognizes the central role of the nervous system in maintaining masticatory equilibrium. The adoption of measurable functional criteria thus makes it possible to overcome a reductionist approach and to align clinical practice with the principles of complex systems medicine, paving the way for more stable, predictive, and scientifically grounded treatments.


<gallery mode="nolines" widths="100" perrow="4">
<gallery mode="slideshow" widths="100">
File:Occlusal Centric view in open and cross bite patient.jpg|'''Figura 1a:''' Vista occlusale centrica di un paziente con morso incrociato e aperto.
File:Occlusal Centric view in open and cross bite patient.jpg|'''Figure 1a:''' Centric occlusal view of a patient with crossbite and open bite.
File:Bilateral Electric Transcranial Stimulation.jpg|'''Figura 1b:''' Stimolazione transcranica bilaterale: simmetria dei masseteri.
File:Bilateral Electric Transcranial Stimulation.jpg|'''Figure 1b:''' Bilateral transcranial electrical stimulation: masseter muscle symmetry.
File:Jaw Jerk .jpg|'''Figura 1c:''' Riflesso della mandibola: simmetria funzionale confermata.
File:Jaw Jerk .jpg|'''Figure 1c:''' Jaw jerk reflex: confirmed functional symmetry.
File:Mechanic Silent Period.jpg|'''Figura 1d:''' Periodo silente meccanico: attivazione bilaterale equilibrata.
File:Mechanic Silent Period.jpg|'''Figure 1d:''' Mechanical silent period: balanced bilateral activation.
</gallery>
</gallery>


=== Tre domande guida (con risposte essenziali) ===
=== Three guiding questions (with essential answers) ===


;1) Che cosa: in che senso il sistema masticatorio è un sistema complesso (e non solo biomeccanico)?
;1) What: in what sense is the masticatory system a complex system (and not merely biomechanical)?
È un sistema in cui morfologia (denti/occlusione) e controllo neurofisiologico (trigemino e reti centrali/periferiche) interagiscono in modo non lineare: la funzione emerge dall’integrazione tra componenti, non dalla forma isolata.
It is a system in which morphology (teeth/occlusion) and neurophysiological control (trigeminal system and central/peripheral networks) interact non-linearly: function emerges from the integration of components, not from isolated form.


;2) Perché: perché “malocclusione” è spesso una categoria insufficiente sul piano funzionale e diagnostico?
;2) Why: why is “malocclusion” often an insufficient category from a functional and diagnostic standpoint?
Perché la “malocclusione” descrive prevalentemente un’asimmetria morfologica, ma può non corrispondere a una disfunzione: esistono adattamenti neuromuscolari che preservano simmetria e performance funzionale anche in presenza di discrepanze evidenti.
Because “malocclusion” primarily describes a morphological asymmetry, which may not correspond to dysfunction: neuromuscular adaptations can preserve symmetry and functional performance even in the presence of evident discrepancies.


;3) Come: come i test elettrofisiologici cambiano la diagnosi e la strategia terapeutica (dalla forma alla funzione)?
;3) How: how do electrophysiological tests change diagnosis and therapeutic strategy (from form to function)?
Introducono criteri misurabili di simmetria e controllo neuromuscolare (riflessi, potenziali evocati, periodo silente), permettendo una diagnosi basata sulla funzione e guidando terapie orientate alla stabilità funzionale e alla prevenzione delle recidive.
They introduce measurable criteria of symmetry and neuromuscular control (reflexes, evoked potentials, silent period), enabling function-based diagnosis and guiding therapies aimed at functional stability and relapse prevention.


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* Avivi-Arber L; Martin R; Lee JC; Sessle BJ. The Face Sensorimotor Cortex and its Neuroplasticity in Health and Disease. ''J Dent Res''. 2019;98(11):1184–1194. doi:10.1177/0022034519865385
* Avivi-Arber L; Martin R; Lee JC; Sessle BJ. The Face Sensorimotor Cortex and its Neuroplasticity in Health and Disease. ''J Dent Res''. 2019;98(11):1184–1194. doi:10.1177/0022034519865385


* Iwata K; Sessle BJ. Neural Basis of Orofacial Functions in Health and Disease. ''J Dent Res''. 2019;98(11):1185–1195. doi:10.1177/0022034519865372
* Iwata K; Sessle BJ. Neural Basis of Orofacial Functions in Healt*
 
* Sessle BJ. Face sensorimotor cortex: its role and neuroplasticity in the control of orofacial movements. ''Prog Brain Res''. 2011;188:71–82. doi:10.1016/B978-0-444-53825-3.00010-3
 
* Sadegh-Zadeh K. {{cita libro|titolo=Handbook of Analytic Philosophy of Medicine|url=https://link.springer.com/book/10.1007/978-94-007-2260-6|anno=2012|editore=Springer|ISBN=978-94-007-2259-0}}
 
* Al-Moraissi EA; Wolford LM. Is Counterclockwise Rotation of the Maxillomandibular Complex Stable Compared With Clockwise Rotation in the Correction of Dentofacial Deformities? A Systematic Review and Meta-Analysis. ''J Oral Maxillomandib Surg''. 2016;74(10):2066.e1–2066.e12. doi:10.1016/j.joms.2016.06.001
 
* Hoffmannová J, et al. Factors affecting the stability of bilateral sagittal split osteotomy of the mandibular ramus. ''Prague Med Rep''. 2008;109(4):286–297. (PubMed: 19537679)
 
* Cassell EJ. The Nature of Suffering and the Goals of Medicine. ''N Engl J Med''. 1982. doi:10.1056/NEJM198203183061204
 
* Engel GL. The need for a new medical model: a challenge for biomedicine. ''Science''. 1977;196(4286):129–136. doi:10.1126/science.847460
 
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[[Category:Introduzione]]

Versione delle 14:19, 29 dic 2025

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Introduction Abstract

Masticationpedia
Masticationpedia
Article by: Gianni Frisardi

Abstract

The masticatory system — including teeth, occlusion, muscles, temporomandibular joints, and central and peripheral neural control networks — cannot be adequately described as a simple biomechanical mechanism. Rather, it must be interpreted as a complex adaptive system, in which function emerges from non-linear interactions among morphological, neuromuscular, and neurophysiological components. Within this framework, many clinical manifestations that appear “abnormal” according to traditional models do not represent errors or therapeutic failures, but instead constitute genuine signals of paradigmatic crisis, in the sense originally described by Thomas Kuhn.

The classical approach to the diagnosis and treatment of masticatory disorders has historically been based on predominantly morphological categories, particularly the concept of “malocclusion.” However, clinical experience and increasing experimental evidence demonstrate that occlusal form, when considered in isolation, is not a reliable predictor of function. Patients with marked occlusal discrepancies may exhibit stable neuromuscular balance, whereas individuals with morphologically “correct” occlusions may develop pain, instability, and functional relapse. For this reason, Masticationpedia proposes a conceptual shift from “malocclusions” to “occlusal dysmorphisms”, emphasizing the distinction between morphological description and functional meaning.

Electrophysiological tests — including mandibular reflexes, motor evoked potentials, and the mechanical silent period — represent fundamental tools for investigating the functional level of the masticatory system. They allow objective assessment of neuromuscular symmetry, reflex control, and the integration between peripheral structures and the central nervous system. The evidence presented shows that functional symmetry can be preserved even in the presence of pronounced occlusal dysmorphisms, through adaptive neuroplastic mechanisms that stabilize the system over time.

This perspective has decisive clinical implications. Masticatory rehabilitation — whether orthodontic, prosthetic, or surgical — can no longer be oriented exclusively toward achieving static occlusal stability. Instead, it must aim for dynamic functional stability, verifiable through reproducible neurophysiological parameters. The absence of such integration represents one of the main causes of therapeutic failure and late relapse, often erroneously attributed to poor patient compliance.

Within this framework, the OrthoNeuroGnathodontic model emerges as an integrated diagnostic-therapeutic strategy combining morphological evaluation, functional analysis, and clinical electrophysiology. This model does not merely correct form, but recognizes the central role of the nervous system in maintaining masticatory equilibrium. The adoption of measurable functional criteria thus makes it possible to overcome a reductionist approach and to align clinical practice with the principles of complex systems medicine, paving the way for more stable, predictive, and scientifically grounded treatments.

  • Figure 1a: Centric occlusal view of a patient with crossbite and open bite.
    Figure 1a: Centric occlusal view of a patient with crossbite and open bite.
  • Figure 1b: Bilateral transcranial electrical stimulation: masseter muscle symmetry.
    Figure 1b: Bilateral transcranial electrical stimulation: masseter muscle symmetry.
  • Figure 1c: Jaw jerk reflex: confirmed functional symmetry.
    Figure 1c: Jaw jerk reflex: confirmed functional symmetry.
  • Figure 1d: Mechanical silent period: balanced bilateral activation.
    Figure 1d: Mechanical silent period: balanced bilateral activation.

Three guiding questions (with essential answers)

1) What
in what sense is the masticatory system a complex system (and not merely biomechanical)?

It is a system in which morphology (teeth/occlusion) and neurophysiological control (trigeminal system and central/peripheral networks) interact non-linearly: function emerges from the integration of components, not from isolated form.

2) Why
why is “malocclusion” often an insufficient category from a functional and diagnostic standpoint?

Because “malocclusion” primarily describes a morphological asymmetry, which may not correspond to dysfunction: neuromuscular adaptations can preserve symmetry and functional performance even in the presence of evident discrepancies.

3) How
how do electrophysiological tests change diagnosis and therapeutic strategy (from form to function)?

They introduce measurable criteria of symmetry and neuromuscular control (reflexes, evoked potentials, silent period), enabling function-based diagnosis and guiding therapies aimed at functional stability and relapse prevention.

🔒 Would you like to read the full chapter?
If you already have an approved account, sign in with LinkedIn and return to the Book Index: the link will take you to the complete version of the chapter.


Bibliography & references


  • James Frederick Ferrier. Institutes of Metaphysic. 1854. (Internet Encyclopedia of Philosophy: Ferrier).
  • Meehl P. The problem is epistemology, not statistics: replace significance tests by confidence intervals and quantify accuracy of risky numerical predictions. 1997.
  • Sprenger J; Hartmann S. «Bayesian Philosophy of Science. Variations on a Theme by the Reverend Thomas Bayes», Oxford University Press, 2019». 
  • Avivi-Arber L; Lee JC; Sessle BJ. Motor cortex neuroplasticity associated with dental occlusion. J Dent Res. 2015;94(12):1751–1759. doi:10.1177/0022034515596345
  • Avivi-Arber L; Martin R; Lee JC; Sessle BJ. The Face Sensorimotor Cortex and its Neuroplasticity in Health and Disease. J Dent Res. 2019;98(11):1184–1194. doi:10.1177/0022034519865385
  • Iwata K; Sessle BJ. Neural Basis of Orofacial Functions in Healt*
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