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= <big>Introduction</big> =


{{ArtBy|autore=Gianni Frisardi}}
{{ArtBy|autore=Gianni Frisardi}}
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== Abstract ==
== Abstract ==


Il sistema masticatorio (denti, occlusione, muscoli, articolazioni, controllo nervoso centrale e periferico) va compreso come '''sistema complesso''' e non come semplice meccanismo biomeccanico. In questa cornice, le anomalie che non rientrano nei modelli tradizionali funzionano come “segnali di crisi” (Kuhn), spingendo verso un cambio di paradigma diagnostico e terapeutico.
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.


In Masticationpedia questo passaggio si traduce in un approccio interdisciplinare che sposta il focus da “'''Malocclusioni'''” a “'''Dismorfismi Occlusali'''”, perché la morfologia non basta a predire la funzione. I test elettrofisiologici (potenziali evocati motori, riflessi mandibolari, periodo silente) mostrano che una '''simmetria neuromuscolare funzionale''' può essere presente anche in pazienti con discrepanze occlusali evidenti. Questo dato contraddice l’idea che l’asimmetria morfologica equivalga automaticamente a disfunzione e suggerisce che il sistema nervoso abbia un ruolo cruciale nel mantenere l’equilibrio 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.


Ne deriva una conseguenza clinica: la riabilitazione (ortodonzia, protesi, chirurgia) non può più mirare solo alla “stabilità occlusale” intesa in senso statico, ma deve integrare criteri neurofisiologici per prevenire recidive e ottenere stabilità funzionale a lungo termine. In questa direzione si collocano i trattamenti OrthoNeuroGnathodontici, come modello operativo coerente con la medicina dei sistemi complessi.
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.


<gallery mode="slideshow" widths="300">
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.
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:Bilateral Electric Transcranial Stimulation.jpg|'''Figura 1b:''' Stimolazione transcranica bilaterale: simmetria dei masseteri.
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.
File:Jaw Jerk .jpg|'''Figura 1c:''' Riflesso della mandibola: simmetria funzionale confermata.
 
File:Mechanic Silent Period.jpg|'''Figura 1d:''' Periodo silente meccanico: attivazione bilaterale equilibrata.
<gallery mode="slideshow" widths="100">
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|'''Figure 1b:''' Bilateral transcranial electrical stimulation: masseter muscle symmetry.
File:Jaw Jerk .jpg|'''Figure 1c:''' Jaw jerk reflex: confirmed functional symmetry.
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) ===
;1️⃣  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.


;1) Che cosa: in che senso il sistema masticatorio è un sistema complesso (e non solo biomeccanico)?
;2️⃣  Why: why is “malocclusion” often an insufficient category from a functional and diagnostic standpoint?
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.
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.


;2) Perché: perché “malocclusione” è spesso una categoria insufficiente sul piano funzionale e diagnostico?
;3️⃣  How: how do electrophysiological tests change diagnosis and therapeutic strategy (from form to function)?
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.
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.


;3) Come: come i test elettrofisiologici cambiano la diagnosi e la strategia terapeutica (dalla forma alla funzione)?
----
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.
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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
 
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* 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 attuale delle 18:23, 29 dic 2025

Introduction

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)

1️⃣ 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.

2️⃣ 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.

3️⃣ 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.

🔒 Access to the full chapter
👤 Approved users
If you already have an approved account, click on your profile icon and return to the Book Index to read the complete chapter.
🔑 New readers
To access the full content, you must sign in via LinkedIn and request approval.


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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