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UDC: 616.314.13-002.
ETIOLOGY AND PATHOGENESIS OF ACUTE PERIODONTITIS
Ergashev Bekzod
Central Asian Medical University, Burhoniddin Marg‘inoniy Street-64, Phone: +998 95 485 00
70, Email:
, Fergana, Uzbekistan
Email:
ORCID:
https://orcid.org/0009-0000-0382-0811
https://doi.org/10.5281/zenodo.15582894
Abstract. Acute periodontitis is a rapidly progressing inflammatory disease affecting the
periapical tissues, primarily triggered by pulpal necrosis and subsequent microbial invasion.
This article provides a comprehensive review of the etiological factors and pathogenesis of acute
periodontitis based on current scientific literature. The study integrates microbiological,
histopathological, and immunological perspectives to offer a deeper understanding of the
condition's progression. The most common etiological agents include anaerobic gram-negative
bacteria such as Fusobacterium nucleatum, Porphyromonas gingivalis, and Prevotella
intermedia. These pathogens produce endotoxins and enzymes that disrupt periapical tissue
integrity and stimulate host immune responses. Inflammatory mediators like interleukin-1β (IL-
1β), tumor necrosis factor-alpha (TNF-α), and prostaglandin E2 (PGE2) play critical roles in
tissue destruction, especially in promoting osteoclast activation and bone resorption. The
material and methods section outlines the literature search strategy, which included peer-
reviewed articles from PubMed and Scopus databases. Results revealed consistent patterns of
acute inflammatory responses marked by polymorphonuclear cell infiltration, vascular changes,
and cytokine expression. Discussion highlights the delicate balance between host defense
mechanisms and pathogen virulence, emphasizing the need for early diagnosis and intervention.
The study concludes that understanding the complex etiopathogenesis of acute periodontitis is
essential for effective treatment and prevention. Root canal therapy remains the cornerstone of
management, supported by antimicrobial strategies in selected cases. Future research should
focus on immunomodulatory approaches to enhance therapeutic outcomes.
Keywords:
acute periodontitis; Etiology; Pathogenesis; Anaerobic bacteria;
Inflammation; Periapical tissues; Cytokines; Pulpal necrosis; Bone resorption; Endodontic
therapy.
ЭТИОЛОГИЯ И ПАТОГЕНЕЗ ОСТРОГО ПАРОДОНТИТА
Аннотация.
Острый
пародонтит
—
это
быстро
прогрессирующее
воспалительное заболевание, поражающее периапикальные ткани, в первую очередь
вызванное некрозом пульпы и последующей микробной инвазией. В этой статье
представлен всесторонний обзор этиологических факторов и патогенеза острого
пародонтита на основе современной научной литературы. Исследование объединяет
микробиологические, гистопатологические и иммунологические аспекты, чтобы
предложить более глубокое понимание прогрессирования состояния. Наиболее
распространенными
этиологическими
агентами
являются
анаэробные
грамотрицательные бактерии, такие как Fusobacterium nucleatum, Porphyromonas
gingivalis и Prevotella intermedia. Эти патогены вырабатывают эндотоксины и
ферменты, которые нарушают целостность периапикальных тканей и стимулируют
иммунные реакции хозяина. Такие воспалительные медиаторы, как интерлейкин-1β (ИЛ-
1β), фактор некроза опухоли-альфа (ФНО-α) и простагландин E2 (ПГЕ2), играют
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решающую роль в разрушении тканей, особенно в содействии активации остеокластов и
резорбции кости. В разделе «Материалы и методы» описывается стратегия поиска
литературы, которая включала рецензируемые статьи из баз данных PubMed и Scopus.
Результаты выявили последовательные закономерности острых воспалительных
реакций, отмеченных инфильтрацией полиморфноядерных клеток, сосудистыми
изменениями и экспрессией цитокинов. Обсуждение подчеркивает тонкий баланс между
защитными механизмами хозяина и вирулентностью патогенов, подчеркивая
необходимость ранней диагностики и вмешательства. Исследование приходит к выводу,
что понимание сложного этиопатогенеза острого пародонтита имеет важное значение
для эффективного лечения и профилактики. Терапия корневых каналов остается
краеугольным камнем лечения, подкрепленная антимикробными стратегиями в
отдельных случаях. Будущие исследования должны быть сосредоточены на
иммуномодулирующих подходах для улучшения результатов лечения.
Ключевые слова: острый пародонтит; Этиология; Патогенез; Анаэробные
бактерии; Воспаление; Периапикальные ткани; Цитокины; Некроз пульпы; Резорбция
кости; Эндодонтическая терапия.
Intradaction:
Acute periodontitis is a rapidly progressing inflammatory condition
affecting the periodontal ligament and periapical tissues. It is most commonly a sequela of pulpal
pathology, especially necrotic pulp, which allows the migration of microbial agents and their
byproducts through the apical foramen into the periapical region. The result is a swift and often
painful inflammatory reaction that can lead to systemic symptoms and localized tissue
destruction if not promptly managed.
Unlike chronic periodontitis, which evolves gradually over time, acute periodontitis
develops suddenly and is often characterized by intense localized pain, swelling, and sensitivity
to biting or percussion. Clinically, it may follow untreated dental caries, traumatic injuries, or
failed endodontic procedures. The affected tooth may appear extruded or mobile due to
inflammation-induced edema in the periodontal ligament. The importance of early diagnosis lies
in preventing further complications such as abscess formation, cellulitis, or osteomyelitis.
Understanding the mechanisms underlying acute periodontitis — from microbial invasion to host
immune response — is essential for implementing timely and targeted interventions. This paper
focuses on the etiological factors, microbial agents involved, and the host's inflammatory
response, which collectively shape the pathogenesis of this condition.
The etiology of acute periodontitis is multifactorial, with microbial infection as the
principal cause. The condition often arises as a direct extension of a necrotic pulp infection,
where bacterial toxins and microbial organisms penetrate the apical foramen and infiltrate
periapical tissues. Anaerobic bacteria such as Fusobacterium nucleatum, Prevotella intermedia,
and Porphyromonas gingivalis are frequently implicated.
These pathogens secrete virulence factors such as lipopolysaccharides (LPS), proteases,
and cytotoxins that trigger an aggressive host immune response. The div responds by recruiting
neutrophils, macrophages, and lymphocytes to the site. Inflammatory mediators such as
interleukin-1 (IL-1), tumor necrosis factor-alpha (TNF-α), and prostaglandins play central roles
in escalating the local inflammatory reaction, leading to pain, edema, and tissue breakdown.
Pathogenesis involves vascular dilation, increased permeability, and leukocyte infiltration
in the periapical region, resulting in pressure buildup within the confined alveolar socket. This
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pressure contributes to throbbing pain and tooth tenderness. Bone resorption may also occur as a
result of osteoclast activation, a process driven by cytokine release. Non-infectious etiologies—
though less common—include mechanical trauma, over-instrumentation during endodontic
procedures, or occlusal overload. These can initiate a sterile inflammation that mimics the
clinical signs of infectious periodontitis. Overall, acute periodontitis is a localized yet potentially
severe condition. Its pathogenesis is shaped by complex host–pathogen interactions, and timely
therapeutic interventions such as drainage, antibiotics, or root canal treatment are crucial in
mitigating the progression toward chronic pathology or systemic complications.
Materials and Methods:
This review-based research utilized a comprehensive analysis
of literature from peer-reviewed journals, clinical textbooks, and academic databases such as
PubMed, Scopus, and ScienceDirect. The inclusion criteria focused on studies that evaluated the
microbiological, immunological, and histopathological mechanisms of acute periodontitis.
Articles published between 2000 and 2024 were selected, with particular attention to systematic
reviews, randomized controlled trials, and case reports detailing the etiopathogenesis of the
condition.
Keywords
used during the search included “acute apical periodontitis,” “etiology,”
“pathogenesis,” “periapical inflammation,” “anaerobic bacteria,” and “host immune response.” A
total of 85 articles were initially identified. After screening for relevance and excluding
duplicates, 48 articles were critically analyzed.
The methodology followed an integrative review format to synthesize information across
various sources. Data extraction focused on identifying consistent patterns in microbial
involvement, inflammatory mediators, and histological findings in acute periodontitis cases. Key
emphasis was placed on the role of pulpal necrosis, microbial migration, immune cell activity,
and cytokine signaling in initiating and sustaining inflammation.
Clinical case studies were reviewed to correlate symptoms such as tooth sensitivity,
swelling, pain, and radiographic changes with specific stages of inflammatory progression.
Histopathological images and microbiological profiles were also studied to verify the presence of
anaerobic pathogens and assess tissue destruction patterns.
This methodology allowed for a holistic view of the condition’s development, combining
both clinical insights and laboratory-based evidence. The data collected provided a foundation
for synthesizing a clear etiological and pathogenic profile of acute periodontitis, useful for
clinicians and researchers aiming to improve diagnosis and treatment protocols.
Results:
The literature reveals that acute periodontitis predominantly arises from
untreated necrotic pulp, where microbial toxins and bacterial invasion reach the periapical tissues
via the apical foramen. In a study by Siqueira et al. (2009), 85% of acute periapical lesions
showed predominance of strict anaerobes, with Fusobacterium nucleatum and Porphyromonas
gingivalis being the most common. These bacteria release lipopolysaccharides (LPS), which
stimulate an inflammatory cascade.
Histological findings across reviewed studies consistently describe acute inflammatory
infiltrates composed primarily of polymorphonuclear leukocytes (PMNs), edema, and tissue
necrosis in the periodontal ligament. A common observation was the onset of microabscess
formation and vascular dilation within the periapical space, indicating rapid host response.
Several studies, including a multicenter review by Baumgartner et al. (2015), noted that
the presence of gram-negative anaerobes correlates with severe clinical symptoms such as
spontaneous pain, swelling, and systemic fever. Radiographic analysis from various sources
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typically showed periodontal ligament widening in early stages and periapical radiolucency in
more advanced cases. In terms of cytokine activity, elevated levels of interleukin-1β (IL-1β),
tumor necrosis factor-alpha (TNF-α), and prostaglandin E2 (PGE2) were consistently detected in
tissue fluid samples from acute lesions. These mediators are known to contribute to osteoclastic
activity, which explains bone resorption commonly seen in later stages.
Overall, the results suggest a predictable pattern: bacterial infection triggers host immune
response, resulting in acute inflammation, which, if unmanaged, may progress to chronic
inflammation or abscess formation. These findings underline the importance of early endodontic
intervention and microbial control in preventing irreversible tissue damage.
Discussion:
The results of this review affirm that acute periodontitis is a multifactorial
condition initiated by microbial invasion and perpetuated by a robust host inflammatory
response. The predominance of gram-negative anaerobic bacteria in the periapical region,
particularly Fusobacterium nucleatum, Prevotella intermedia, and Porphyromonas gingivalis,
underscores the infectious nature of the disease. These organisms possess virulence factors—
such as endotoxins and proteolytic enzymes—that trigger and amplify local inflammation.
The immune response to these pathogens is immediate and aggressive. The recruitment of
polymorphonuclear leukocytes (PMNs) to the periapical tissues is an early hallmark of acute
inflammation. While essential for controlling bacterial spread, this immune infiltration also
contributes to collateral tissue damage through the release of reactive oxygen species (ROS) and
degradative enzymes.
Cytokines such as IL-1β and TNF-α serve dual roles in defense and destruction. These
pro-inflammatory mediators not only help eliminate pathogens but also promote osteoclast
differentiation, leading to periapical bone resorption. This explains why patients often present
with visible periapical radiolucency and tenderness to percussion in advanced stages. Non-
infectious etiologies like mechanical trauma or over-instrumentation during root canal treatment
may initiate a sterile inflammatory reaction that mimics acute periodontitis. However, literature
indicates that even in such cases, secondary microbial contamination often follows, making
infection a near-universal component of the disease.
Another important consideration is the host's systemic condition. Immunocompromised
individuals, such as those with diabetes or undergoing chemotherapy, may exhibit exaggerated
or atypical responses to periapical infections. This necessitates a personalized approach to
diagnosis and treatment.
Therapeutically, the literature supports a combination of endodontic disinfection and, in
some cases, systemic antibiotic administration. However, indiscriminate antibiotic use is
discouraged due to resistance concerns. Therefore, mechanical debridement and proper drainage
remain the mainstays of treatment. In summary, acute periodontitis reflects a delicate balance
between host defense and microbial aggression. Understanding the nuanced interactions between
pathogen virulence and host immune response is essential for timely diagnosis, effective
management, and prevention of chronic complications.
Conclusion:
Acute periodontitis is an urgent clinical condition driven by microbial
infection and an acute inflammatory response in periapical tissues. The primary etiological factor
is pulpal necrosis, which permits the spread of anaerobic bacteria into the periapical region.
These microorganisms release toxins that activate a complex immune cascade, resulting in the
hallmark features of pain, swelling, and periapical radiolucency.
From the literature, it is evident that the progression of acute periodontitis follows a
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defined pathological sequence: infection, immune response, and tissue destruction. The immune
system's attempts to eliminate pathogens involve the release of inflammatory mediators like IL-
1β and TNF-α, which, while protective, also contribute to alveolar bone loss through osteoclast
activation. Histological and microbiological studies confirm the presence of polymorphonuclear
leukocytes, cytokine activity, and bacterial colonies in the affected area. These insights
underscore the disease’s dual pathology—both infectious and immunological.
Effective management hinges on early diagnosis and intervention. Root canal therapy
remains the treatment of choice for most cases, aimed at removing the source of infection and
halting inflammatory progression. Adjunctive antibiotic therapy is considered in cases with
systemic involvement or immunocompromised status. This review highlights the need for
clinicians to be vigilant in recognizing the early signs of acute periodontitis. A thorough
understanding of its etiology and pathogenesis enables timely treatment and can prevent long-
term complications such as abscess formation, bone resorption, or systemic spread of infection.
Ultimately, acute periodontitis serves as a reminder of the intricate interplay between dental
pathology and host biology. Ongoing research into host modulation and microbial control may
offer new avenues for improved treatment outcomes in the future.
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