Etiology of the disease
In dental practice, the development of this pathology is typically associated with local damaging factors. A true inflammatory process in the nerve fiber itself does not occur.
The main causes of trigeminal neuropathy of the branches include:
- Odontogenic inflammatory processes spreading to the nerve trunks.
- Traumatic injuries of the maxillofacial region.
- Surgical interventions in the oral cavity and on the jaws.
- Prolonged wear of dentures.
- Toxic and allergic effects of various dental materials used in treatment and prosthetics.
Clinical presentation of odontogenic neuropathy
Most frequently, small branches of the trigeminal nerve are involved in the pathological process. The leading symptom is spontaneous, constant, and aching pain. Its intensity may fluctuate (subsiding or intensifying), but the pain syndrome persists for a long time without completely disappearing. The pain characteristically increases upon pressure on the affected nerve.
A key manifestation of the disease is sensory disturbances in the innervation zone (teeth, gums, oral mucosa, skin of the lips, chin, and face):
- Feeling of numbness.
- Paresthesias — distorted sensitivity (e.g., crawling sensation or tingling).
- Hypoesthesia — persistent decrease in sensitivity.
- Anesthesia — complete loss of sensitivity.
The course of the disease depends on the severity. In mild cases and chronic presentation, no serious functional impairments are observed. Severe cases are accompanied by trophic disorders: edema and hyperemia of the mucous membranes occur, along with epithelial desquamation. As a complication of damage to the third branch of the trigeminal nerve, paresis or spasm of the masticatory muscles often develops.
Differential diagnosis of neuropathy and neuralgia
Pain syndromes in these two conditions may seem identical, but their clinical pictures have fundamental differences. Neuropathy must also be differentiated from temporomandibular joint (TMJ) dysfunction.
| Sign | Neuropathy | Trigeminal neuralgia |
|---|---|---|
| Pain characteristics | Constant, aching, without pain-free intervals | Paroxysmal, short-term, burning, stabbing, electric shock-like |
| Relation to time of day | Present constantly | Usually does not disturb at night |
| Trigger zones | Completely absent | Present (on the face, around the lips) |
| Triggering factors | Pressure on the affected nerve | Mechanical and thermal stimuli of low intensity in the trigger zones |
| Additional symptoms | Sensory disturbances, trophic changes | Autonomic manifestations (lacrimation, hyperemia, hypersalivation), reflex facial muscle contractions |
| Patient's behavior | Lacks pronounced specificity | During a paroxysm, freezes in a suffering posture, avoids movement, rubs the painful area |
Distinctions from other dental pathologies
When making a diagnosis, it is important to exclude other diseases accompanied by pain in the maxillofacial region:
- Acute pulpitis: Pain is sharp, spontaneous, paroxysmal, radiating along the nerve path. It intensifies at night and from thermal or mechanical stimuli entering the carious cavity. The bottom of the cavity is acutely painful upon probing, and there is pain upon percussion. The patient's general condition is unaffected in the serous form, while headache and low-grade fever are possible in the purulent form.
- Acute periodontitis: Pain is constant, aching, radiating. Triggered by touching or biting on the tooth. The bottom of the carious cavity is painless, but percussion causes sharp pain. The mucosa near the tooth is edematous and hyperemic.
- Alveolitis: Sharp constant pain following a recent tooth extraction. A normal blood clot is absent in the socket (an empty socket with gray coating or a disintegrating clot), and the perialveolar tissues are inflamed. General malaise is present.
- Maxillary sinusitis: Constant aching (sometimes pulsating) pain, possible soreness when biting on teeth. Accompanied by nasal congestion, mucous or purulent discharge (worsens when lying on the healthy side). Characterized by headache that intensifies with coughing, sneezing, or head tilting, as well as fever.
Briefly: answers to topical questions
Which specific branches of the trigeminal nerve (nerve names) are most commonly involved in the pathological process in odontogenic neuropathy?
The provided sources do not specify the exact anatomical names of the nerves most commonly involved in odontogenic neuropathy.
Source-confirmed information:
- in odontogenic neuropathy, small branches of the trigeminal nerve are more frequently affected;
- damage to the third branch of the trigeminal nerve often leads to spasm or paresis of the masticatory muscles;
- following tooth root resection surgery, neuropathy of the corresponding dental plexus is possible as a consequence of the inflammatory process combined with trauma to the nerve endings.
By what clinical symptoms are trigeminal neuropathy and temporomandibular joint (TMJ) dysfunction differentiated?
According to sources, trigeminal neuropathy and TMJ dysfunction can be differentiated by the nature of pain, sensory disturbances, and musculoskeletal manifestations.
| Sign | Trigeminal neuropathy | TMJ dysfunction |
|---|---|---|
| Pain characteristics | Constant pain; in odontogenic neuropathy — spontaneous, constant, aching | Pain occurs only during lower jaw movement or is constant and aching in nature |
| Paroxysms and trigger zones | Absence of pain-free intervals, absence of trigger zones; odontogenic neuropathy is characterized by the absence of paroxysms and trigger zones | Sources describe the association of pain with lower jaw movements and triggering factors for TMJ |
| Sensory disturbances | Numbness, paresthesias, hypesthesia, and anesthesia in the innervation zone are possible | Sensory disorders are not listed in the provided sources for TMJ dysfunction |
| Mandibular movements | Lesions of the third branch of the trigeminal nerve often result in spasm or paresis of the masticatory muscles | Limited mouth opening, S-shaped mandibular movement during opening and closing |
| Articular manifestations | Joint clicking or crepitus is not described in sources for trigeminal neuropathy | Clicking or crepitus in one or both joints |
| Palpation | Pain increases upon pressure over the affected nerve | Tenderness of the masticatory muscles or their parts |
To remember the differences between neuropathy and neuralgia, use the three P's for neuropathy: Persistent pain, Paresthesia/loss of sensitivity, Pain-free intervals are absent.
Class and exam questions
Are there periods of complete pain freedom in neuropathy?
No, unlike neuralgia, the pain in neuropathy is constant in nature. The intensity may vary, but pain-free intervals are absent.
What motor disorders may occur in this condition?
When the third branch of the trigeminal nerve is affected, the motor portion may be involved, leading to spasm or paresis of the masticatory muscles.
How to distinguish neuropathy from a neuralgia attack based on patient behavior?
During a neuralgia attack, the patient is taciturn, freezes in a suffering posture, is afraid to move, holds their breath, and may intensely rub the painful area. With neuropathy, such acute behavioral reactions are not observed.
What else to study on this topic
- Conservative treatment of neuralgia (anticonvulsants, nerve blocks, antispasmodics)
- Surgical treatment: destructive and decompression methods
- Pterygopalatine ganglionitis (Sluder's syndrome) and its symptoms
- Glossopharyngeal and vagus nerve neuralgia: clinical presentation and differential diagnosis
- Complications and generalization in vagus nerve lesions
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Other topics in "Chapter 12. Diseases and Injuries of Facial Nerves (E.I. Deryabin)"
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