Anatomical background and terminology
The morphofunctional complex of tissues surrounding the tooth is called the dentogingival segment. In Russian practice, the term "periodontium" (парóдонт) is traditionally used to refer to it, which includes the gingiva, periodontium, alveolar bone, and cementum.
However, this concept is absent from the International Classification of Diseases in Dentistry and modern anatomical nomenclatures. Instead, the term "periodontium" is used. For this reason, in foreign medical literature, the diagnosis is termed "periodontitis" rather than the Russian equivalent.
Etiology and the role of microflora
The main triggering mechanism of inflammatory periodontal diseases is the facultative oral microflora that forms dental plaque. Bacteria colonize the tooth surface, provoking dysbiosis and secondary infection at the slightest disruption of the epithelial integrity.
More than five hundred species of microorganisms have been isolated from the gingival sulcus, yet only twelve of them play a key role in pathogenesis. The main causative agents include:
- Porphyromonas gingivalis
- Actinobacillus actinomycetemcomitans
- Bacteroides forsythus
- Prevotella intermedia
- Treponema denticola
General pathogenesis factors
There is currently no single theory that fully explains the mechanisms of the pathology's development. Vascular, neurogenic, and autoimmune concepts reveal only separate links of the process. Therefore, it is customary to distinguish a complex of general factors that create a favorable background for the disease:
- Endocrine and hormonal shifts: diabetes mellitus, thyroid disorders, Cushing's disease, as well as physiological adjustments (pregnancy, puberty).
- Vascular disorders: atherosclerosis, arterial hypertension, microcirculation disorders.
- Diseases of internal organs: peptic ulcer disease, chronic hepatitis, rheumatic pathologies.
- Immune status: genetically determined features of the immune system play a crucial role in the nature of the response to bacterial aggression.
- Other conditions: infections, vitamin deficiencies, hematopoietic disorders.
Mechanism of periodontitis development
Periodontitis represents a heterogeneous group of diseases in which inflammation affects all periodontal tissues with impaired repair. The basic pathogenetic mechanism is chronic immune productive inflammation, often accompanied by an autoimmune component.
Pathogenetic chain (stages of progression):
- Onset of marginal gingivitis.
- Destruction of the dentogingival junction.
- Transformation of the normal gingival sulcus first into a gingival pocket, and then into a pathological periodontal pocket.
- Tooth mobility due to the loss of supporting structures.
- Tooth loss.
Pathogenesis features of other lesions
Development mechanisms depend on the specific nosological form:
- Periodontosis: unlike periodontitis, age-related tissue changes, jaw bone osteoporosis, and general systemic factors play the leading role here. Negative environmental impacts (radiation, electromagnetic radiation from household and industrial appliances, waste pollution) are also assumed.
- Granulomatous gingivitis: develops as a reaction to the embedding of foreign particles (components of prophylactic pastes, nickel or gold particles) into the gingiva, leading to the formation of granulomas.
- Desquamative gingivitis: characterized by enhanced shedding of the surface epithelium. Most commonly, this is a local manifestation of severe systemic diseases (systemic lupus erythematosus, pemphigus vulgaris, lichen planus). In idiopathic cases, the process is associated with hormonal imbalances or an abnormal local immune response to substances in dental plaques.
To easily remember the composition of the periodontium (dentogingival segment), use the mnemonic CAP-G: Cementum, Alveolar bone, Periodontium, Gingiva.
Class and exam questions
What is the role of dental deposits in pathogenesis?
They act as the main etiological factor. Dental plaque provokes oral dysbiosis and secondary infection against the background of epithelial damage.
How does the pathogenesis of periodontosis differ from periodontitis?
In periodontosis, age-related changes, jaw bone osteoporosis, and environmental influence come to the fore, while the inflammatory process is initially absent (it may join later as a complication).
Why is desquamative gingivitis often called a clinical term?
Because in most cases this is not an independent disease, but a local manifestation of severe systemic pathologies such as scarring pemphigoid, lupus erythematosus, or lichen planus.
What else to study on this topic
- Classification of gingival and periodontal diseases (Russian and international)
- Clinical picture and severity stages of periodontosis
- Instrumental diagnosis of dental deposits (types and use of explorers)
- Complications of odontogenic infection (jaw osteomyelitis, odontogenic sepsis)
- Desmodontosis (idiopathic progressive periodontolysis) as a rare form of lesion
Master the entire topic in the course "Surgical Dentistry"
This is a summary. The course covers everything tested in classes and exams.
- Complete study guide on "Pathogenesis of periodontal diseases" and 866 more pages on the subject
- Assignments and quizzes after every topic — just like in a colloquium
- AI tutor answers questions on the topic anytime
- 28 video lessons on the subject
Prepared by WhiteCoat Pro faculty in accordance with the medical school curriculum. For educational purposes only.