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Characteristics of Periodontal Proprioception

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Abstract

The dental organ is a privileged functional zone because it is a rich sensory-innervated element, not just “a piece of bone set in a bone” useful to crush food and give a pretty smile. In physiological conditions (mastication, deglutition, etc.), they benefit from periodontal tactile (non-algic) receptors which react to intensity and direction of the forces applied to the tooth. However, scientific data do not yet exist to know how they react to abnormally excessive mechanical forces as they occur in parafunctional teeth clenching. In any way, normal functional conditions mean that the cerebral sensory cortex expects to receive the same sensory volume on the right side and on the left side. Unbalanced inputs (due to malocclusion) are able to generate spasticity in the stomatognathic musculature but even beyond the oral sphere.

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Notes

  1. 1.

    Periodontium  =  ligament which links the tooth to the maxillary bone.

  2. 2.

    They are precise to the micron, that is, thousandths of millimeter. Some objects are so small that they are hardly perceptible between thumb and forefinger, but they are sensed between upper and lower teeth. In a personal study with blind children and young adults who had to feel a calibrated hair between their teeth, we found that the discriminative tactile rate was decreasing as we moved from the front teeth to the back teeth.

  3. 3.

    This is explained by the particular role of teeth in the digestive system. They participate in regulating food mastication and play a significant stereognostic role in the identification of the forces used to hold and manipulate food between teeth [45]. They inform the nervous centers to modulate the motor neurons of masticatory and swallowing muscles for maximal functional efficiency. Other functional roles include modifying the salivary flow, remodeling the alveolar bone, and participating in maxillary and mandibular bone growing. In the nociceptive field they produce alarm signals in case of threat to the dental tissues.

  4. 4.

    The key role of incisors in the blind mole rat could explain the large representation in the S1 somatosensory cortex (31 %) [6].

  5. 5.

    The cerebral sensory cortex expects to receive the same sensory volume on the right side and on the left side (Fig. 5). We speak of non-nociceptive – that is, tactile – inputs. Let’s use a clinical example: your dentist has just fit a crown in your mouth. Typically, you must not be aware of this new component. In neurophysiological terms, your body scheme must accept it. People often believe – wrongfully so – “No pain: no problem.” In fact the component should in no way exist when you lightly tap the upper and lower teeth together. Any tactile feeling of imbalance must be immediately pointed out by the patient and fixed by the dentist. If not, dysfunctional reflexes from the trigeminal territory may occur since adjustment by the nervous system is very difficult, even impossible in most cases. Indeed, leaving this kind of occlusal abnormality unchanged may be considered as a neurophysiological error and a professional fault. To help perform a very sophisticated equilibration, we previously described an easy method called the shoulder method [16, 18]. The patient’s awareness of his neural tactile sensitivity directs the dentist to perform a more ­balanced occlusion as compared to low-tech methods (paper, varnish, scan, etc.).

  6. 6.

    Tact, stereognosis (capacity in recognizing thickness, form, and texture of food), proprioception which permits to everyone to spatially situate one’s teeth position. The first and the second moods are conscious; the third is unconscious. Type 1 PR keeps a major role in learning functions and movements. The proprioceptive control on the behavioral sets appears to be higher during new works learning and realizing [21, 22]. The PR could initiate a negative feedback [7, 12, 32, 46] due to very fine biting force discrimination when TMJ receptors failed [47]. Remember about the tiger female and its cub. Muscle receptors do not pulsate within the 1 mm band preceding the closing of the mouth [3]. But during mastication, the conditions change [15, 43, 44]: the PR sensibility decreases [28]. Their dental protecting role towards excessive biting forces, specially at the end of the masticatory cycle, is confirmed by some studies [13, 38]. Otherwise a periodontal and neuromuscular bundle co-activation of the masseteric has been shown [4, 9]. There is a closing mouth masseteric reflex due to ipsilateral PR stimulation [48, 49]. The study in humans [25, 26, 45] confirmed the animal recorded results. A positive feedback of PR exists for chewing force control when a substantial influence of joint receptors on movement control does not [42]. It has been also evoked their role into maxillary growing mechanisms [10, 17] (Fig. 6). Finally the type 1 PR also intervene in human parotid secretion control [1, 19, 20]. According to some studies, mechanical receptors exist in intradental region, and both can provide a continuum of dynamic afferent inputs necessary for tactile sensitivity of teeth [8]. Intraoral touch receptors, spindles in jaw-closing muscles, and specialized PR have especially powerful effects on physiological movement parameters [31]. The periodontal tissue also receives a major sympathetic innervation as shown by histological, histochemical, and electrophysiological studies [24, 27]. Otherwise when teeth are lost, the tactile information is relayed by mucosal receptors [23, 39]. Neurophysiologists call that as a vicarious phenomenon.

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Hartmann, F., Cucchi, G. (2014). Characteristics of Periodontal Proprioception. In: Stress and Orality. Springer, Paris. https://doi.org/10.1007/978-2-8178-0271-8_6

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