Continuing Education Activity

Periodontitis is a common chronic inflammatory disease affecting the supporting structures of the teeth and results from complex interactions between microbial biofilms and local and systemic host factors. Progressive destruction of the periodontal ligament and alveolar bone can lead to tooth mobility, tooth loss, and adverse effects on overall health if left untreated. This course reviews the pathogenesis, risk factors, clinical presentation, diagnostic evaluation, and evidence-based management of periodontitis. Participants learn to recognize disease severity, implement appropriate nonsurgical and surgical treatment strategies, identify modifiable risk factors, and emphasize preventive measures to preserve periodontal health. Attention is also given to the relationship between periodontitis and systemic conditions that may influence disease progression and treatment outcomes. Collaboration with an interprofessional healthcare team enhances comprehensive patient assessment, reinforces preventive care and oral hygiene practices, improves management of systemic comorbidities, and supports better long-term oral and overall health outcomes.

Objectives:

• Describe the role of dental biofilm in development of periodontitis.
• Summarize the differences between chronic periodontitis and aggressive periodontitis.
• Review treatment considerations for periodontitis.
• Explain a well-integrated, interprofessional team approach to caring for patients with periodontitis to improve patient outcomes.

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Introduction

Approximately 700 species of microorganisms colonize the human oral cavity.[1] These bacteria inhabiting the human oral cavity are mainly commensals, along with a sparse population of pathogenic bacteria.[2] Periodontitis is one of the most common dental ailments, leading to the destruction of the supporting and surrounding tooth structures.[3] The term "periodontitis" is built up of two words, ie, "periodont-" meaning "structure surrounding the teeth" and "itis" meaning "inflammation." Periodontitis is a disease of the gingival tissue that, if left untreated, leads to the spread of inflammation to deeper tissues, disrupts bone homeostasis, and causes tooth loss.[3] 

Periodontal disease has a multifactorial origin.[4] The main culprit in periodontitis is the bacterial biofilm that forms on tooth surfaces.[5][6] While the host response determines disease progression, local factors such as plaque and calculus, genetics, environmental factors, the patient's systemic health, lifestyle habits, and various social determinants also play a role.[4] The deleterious effects of periodontopathogens are not limited to the periodontium; they also affect patients' systemic health.[7]

Etiology

The primary causative agent of periodontal disease is mixed bacterial colonization of the oral tissues.[2][8] Other factors act as secondary etiologic factors that accelerate the progression and development of periodontal diseases, including developmental grooves, calculus, dental plaque, overhanging restorations, anatomical features such as the short trunk and cervical enamel projections, systemic factors, genetic factors, smoking, and stress.[9][10]

Loe et al. (1965), in their pioneering study "Experimental Gingivitis in Man," confirmed the role of dental plaque in the genesis of gingival and periodontal disease.[11] Within 7 to 21 days after discontinuation of oral hygiene measures, gingivitis develops. This gingivitis is a reversible process within 7 to 10 days after the reestablishment of oral hygiene measures.[11] Further studies by Theilade et al (1966) demonstrated the bacteriological basis for the shift from a gram-positive bacterial population associated with periodontal health to a predominant gram-negative bacterial population associated with periodontal disease.[12] 

Epidemiology

Not all cases of gingivitis progress to periodontitis, as it depends on the host response.[4] Periodontitis can be broadly classified into chronic and aggressive periodontitis. Cases of chronic periodontitis (CP) are associated with a plethora of plaque and calculus.[13] The characteristic features of aggressive periodontitis (AgP) include familial aggregation of disease, extensive periodontal destruction, and minimal local factors.[14] AgP is further classified as local aggressive periodontitis (LAP) and generalized aggressive periodontitis (GAP).

According to an epidemiological study conducted by Susin et al., the prevalence of LAP varies by ethnicity and geographic location.[15] There is an estimated prevalence of 2.6% in African Americans, 1 to 5% in Africans, 0.2% in Asians, 0.5 to 1% in North Americans, and 0.3 to 2% in South Americans.[15] Overall, GAP has a prevalence of 0.13%, and LAP has a prevalence of less than 1%.[15] In developing countries, there is an increased prevalence of chronic periodontitis as compared to developed countries.[16] According to the National Health and Nutrition Examination Survey III (NHANES III), 50% of the adult population in the United States has gingival and periodontal disease.[17]

Pathophysiology

To understand the pathophysiology of periodontal disease, it is essential to know about the complex dental biofilm as well as the Immune response associated with the disease. Dental plaque is a complex biofilm composed of bacteria enclosed by a protective matrix. This matrix is composed of extracellular polysaccharides and glycoproteins, providing a protective environment for microbes in the dental biofilm.[18] 

This component of the dental biofilm makes it 1000 to 1500 times more resistant to antimicrobial agents.[2] The various circulatory channels present in the biofilm aid in the distribution of many nutrients and excretion of the generated metabolic wastes. "Quorum sensing" is a mode of communication among bacterial microcolonies within the dental biofilm.[19] "Autoinducers" are molecules secreted by microbes; their concentrations help regulate bacterial gene expression.[19] The biofilm, with varying pH levels and metabolites, has various microenvironments. These microenvironments make the ecosystem suitable for a variety of microbes inhabiting the same dental plaque.[18] 

The initial layer deposited on the surface of teeth in the formation of dental plaque is the "acquired pellicle."[20] This layer forms within seconds of exposure of tooth surfaces and is followed by the initial attachment of early biofilm colonizers. Streptococcus and Actinomyces species are the primary colonizers, which are gram-positive, facultative bacteria.[20] The "adhesin receptors" present on the surface of primary colonizers bind with the proline-rich proteins of the pellicle. This binding reveals receptor sites known as "cryptitope," which further lead to coaggregation.[21] 

Gradually, dental plaque forms layer by layer, creating an oxygen-deficient environment that eventually promotes the colonization of anaerobic bacteria.[22] The bridging microbe between primary and secondary colonizers is Fusobacterium species.[22] The gradual shift from aerobic to anaerobic conditions marks the progression of gingivitis to periodontitis. In a study, Socransky et al divided the microbes into microbial complexes based on color.[5][23] Red and orange complex bacteria present in the subgingival area are intricately associated with periodontal disease.[5]

Gradually, the host mounts a classic innate immune response to the bacterial infection.[24] The response shows signs of acute inflammation, including increased gingival redness, bleeding, and swollen gums, as well as neutrophil migration to the site of inflammation. Innate immunity also activates the body's primary host cells, preparing the body for defense against bacterial infection, and triggers adaptive immunity.[24] 

Innate immunity also triggers the host cell to differentiate into more specialized cells, thereby increasing the production of pro-inflammatory mediators such as interleukin-1 beta, prostaglandins, and tumor necrosis factor.[24] The cascade is activated, resulting in the establishment of adaptive immunity by activating specific T and B lymphocytes. There is documentation of B- and T-cell involvement in the activation of RANK (Receptor activator of nuclear factor-kB), which results in bone loss through osteoclast activation.[25]

Histopathology

Gingivitis is the initial stage of the body's response to local factors in the oral cavity; it is a reversible process without loss of bone or periodontal support.[11][12] Histopathologically, within the lamina propria, collagen fibers are destroyed, resulting in ulcerations of the sulcular epithelium.[26] According to Page et al, there are three histopathological stages of gingivitis: initial lesion, early lesion, and established lesion.[26] These lesions are marked by distinct cell types demarcating the transition between these stages.

Further inflammatory changes in the gingiva lead to the progression of periodontal disease from the established to the advanced stage.[26] The spread of inflammation from the epithelium to the connective tissue occurs laterally and apically, resulting in the destruction of collagen fibers. This destruction of collagen fibers presents clinically as "attachment loss," marking the shift from gingivitis to periodontitis. Gradually, as osteoclasts are activated, bone resorption begins, leading to tooth loss.[26]

History and Physical

Periodontal disease has been described as an inflammatory condition by the Chinese and Egyptians as early as 4000 years ago.[27] Hippocrates described periodontal disease as "the gums were bleeding or rotten" and also enumerated the etiological factors and pathogenesis of various forms of gum disease.[27] Pierre Fauchard was the first to discuss the etiology and treatment modalities in his meticulous work, Le chirurgien dentiste.[28] He provided various modalities for the treatment of periodontitis, such as scaling and root planing, mouthwashes, and dentifrices.[28]

Chronic periodontitis is more prevalent in the adult population but can occur in younger patients too.[29] The amount of disease progression correlates with the number of local factors present.[30] The progression of chronic periodontitis is slower and associated with specific bacteria. Familial aggregation and neutrophil defects are not associated with chronic periodontitis.[30]

Generalized signs of gingival inflammation are present, with periodontal pockets ranging from 4 to 12 mm.[30] Clinical features like attachment loss and gingival bleeding are associated with the disease but are ignored by the patient due to the painless nature of symptoms. One of the main characteristics of the disease is its asymptomatic nature.[29]

Compared with chronic periodontitis, aggressive periodontitis has a distinct set of characteristics that clearly define the disease, making it simple to diagnose. Baer et al (1971) defined aggressive periodontitis as "a disease of the periodontium occurring in otherwise healthy adolescents, which is characterized by a rapid loss of alveolar bone around more than one tooth of the permanent dentition."[31] The presence of local factors such as calculus is not commensurate with the extent of periodontal tissue destruction.[31] 

The classical case presentation of aggressive periodontitis includes early age onset of disease, vertical bone loss in molars and incisor teeth leading to mobility, familial aggregation, and rapid progression of the disease.[14] Aggressive periodontitis is subclassified into localized aggressive periodontitis (LAP) and generalized aggressive periodontitis (GAP). LAP is characterized by bone loss involving permanent molars and incisors, while GAP involves most of the permanent teeth.[14]

Evaluation

For cases of chronic periodontitis and aggressive periodontitis, both clinical and radiographic examination are mandatory. Clinical examination involves assessment of local factors: developmental discrepancies of teeth leading to increased plaque accumulation; bleeding on probing (a sign of inflammation of periodontal tissue); periodontal probing to estimate pocket depth, performed manually or with pressure-sensitive probes; and determination of furcation involvement, recession, and clinical attachment level.[32] Following clinical examination, radiographic assessment of bone loss should be performed using a set of intraoral periapical radiographs, bitewing radiographs, or a panoramic radiograph.[32]

In cases of aggressive periodontitis, the classical clinical features, along with radiographic evaluation, help with diagnosis.[14] In an oral pantomograph, mirror-like arch defects are seen in the permanent molar region.[14] Periodontal pathogens including Aggregatibacter, Porphyromonas gingivalis, Tannerella forsythia, and Campylobacter rectus are associated with periodontitis in various microbiological and epidemiological studies.[33][2]

Treatment / Management

The main aim of periodontal therapy is to improve the patient's gingival health and preserve the remaining periodontal tissues.[34] Both local factors and the bacterial load of periodontopathogens require reduction, along with the correction of behavioral factors such as cessation of smoking and tobacco consumption, as part of periodontal treatment.[34] After the clinical and radiographic assessment of the patient, Periodontal charting is performed, along with recording periodontal indices to gauge the severity and extent of disease.

Following the clinical assessment, the patient should receive counseling to initiate behavioral changes, such as smoking cessation, and to improve oral hygiene.[35] Following the clinical assessment, non-surgical periodontal therapy commences, including scaling and root planing, mouthwashes and dentrifices, local drug delivery at the infection site, and systemic chemotherapeutic agents as an adjunct to scaling and root planing.[36] Regular review of nonsurgical periodontal therapy is critical, as non-responding sites must be treated with surgical periodontal therapy followed by a periodontal maintenance phase.[34]

Differential Diagnosis

Periodontal disease may present as a gingival or periodontal abscess, acute necrotizing ulcerative gingivitis, or endodontic-periodontal lesions.[37] In cases of localized periodontal disease, the disease's origin must be differentiated between pulpal and periodontal. Nonresponding cases of periodontitis are categorized as refractory periodontitis.[37] 

Prognosis

Several factors affect the prognosis of periodontally involved teeth. Factors like the position of teeth in the arch also affect the prognosis of teeth with periodontitis, with the risk being lowest for mandibular canines and highest for maxillary second molars.[38] Prognosis is poor for teeth with increased periodontal probing pocket depth, mobility, bone loss, furcation involvement, malpositioned teeth, and an inadequate crown-root ratio.[39] With the improving effectiveness of oral hygiene measures practiced by the patient and the discontinuation of smoking, the prognosis of the case improves, along with a decrease in tooth mobility.[39] Teeth with bleeding sites during the maintenance phase have a risk of attachment loss that is three times higher than that of non-bleeding sites.[40] 

Complications

An inflammatory host response characterizes periodontal disease. The surface of periodontal tissue affected by inflammatory changes is about 15 cm^2 to 72 cm^2.[41] The inflammatory burden present due to untreated periodontal disease is associated not only with local destruction of periodontal tissue but also with an increase in C-reactive protein, which causes systemic effects on the cardiovascular system, low birth weight in newborn babies, Type II diabetes mellitus, and chronic obstructive pulmonary disease.[42]

Deterrence and Patient Education

The most critical factor in the shift from periodontal disease to health is the establishment of effective oral hygiene practices.[43] The demonstration of brushing techniques, such as the Bass brushing technique, should be shown on models and in the patient's mouth, as well as through video demonstrations, along with the importance of interdental brushing.[34] This stage of patient compliance plays a pivotal role in the success of treatment and the long-term maintenance of periodontal health.[43] Periodontal disease management is drastically affected by the cessation of smoking.[35] The periodontal maintenance phase, with repeated reinforcement of oral hygiene techniques in a patient-tailored recall program, helps improve the prognosis of the disease.[44]

Enhancing Healthcare Team Outcomes

Periodontitis is the most common disease associated with the oral cavity. Approximately 50% of patients visiting a dental clinic have gingival or periodontal disease. It is imperative for the clinician to identify periodontal disease and address it with appropriate treatment modalities. The final complication in cases of periodontitis is not limited to tooth loss; it also affects the patient's general systemic health. Hence, it is crucial not only for dentists but also for general physicians to be aware of the adverse effects of periodontitis on systemic health.[45] In cases of periodontal involvement, there is a risk of pulpal involvement of the tooth; hence, other dental specialties, including the dental nurse, also need to be involved for appropriate care.

The treatment requires a holistic approach. The treatment involves the patient's motivation as well as a local intervention using non-surgical and surgical periodontal treatment along with the adjunctive role of chemotherapeutic agents.[46] The most important part of periodontal treatment is the maintenance phase, which plays a crucial role in preventing the disease from recurring.

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Disclosure: Neha Mehrotra declares no relevant financial relationships with ineligible companies.

Disclosure: Saurabh Singh declares no relevant financial relationships with ineligible companies.