Masticationpedia

Introduction Abstract

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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.

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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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