Pathophysiology and Microbiology - Chronic periodontitis is caused by the accumulation of dental plaque, leading to chronic inflammation of the periodontal tissues. - The disease progresses from gingivitis to chronic periodontitis, and in some cases, aggressive periodontitis. - Gram-negative tooth-associated microbial biofilms trigger a host response, resulting in bone and soft tissue destruction. - Matrix metalloproteinases (MMPs), cathepsins, and other osteoclast-derived enzymes contribute to tissue destruction. - The specific plaque hypothesis and the non-specific plaque hypothesis are two theories explaining the microbiology of periodontitis. - The disease is associated with a variable microbial pattern. - Anaerobic species such as Porphyromonas gingivalis, Bacteroides forsythus, and Treponema denticola are implicated in chronic periodontitis. - Microaerophile bacteria like Actinomyces actinomycetemcomitans and Campylobacter rectus may also play a role.

Signs, Symptoms, and Diagnosis - In the early stages, chronic periodontitis may have few symptoms, leading to delayed treatment. - Symptoms can include redness or bleeding of gums, gum swelling, halitosis, gingival recession, and deep pockets between teeth and gums. - Loose teeth and drifting of incisors can occur in later stages. - Gingival inflammation and bone destruction are often painless. - Subgingival and supragingival calculus are common findings. - Chronic periodontitis is one of the seven destructive periodontal diseases in the 1999 classification. - Diagnosis can be challenging due to the slow and painless progression of the disease. - A full mouth examination is necessary, including measurements of pocket depth, clinical attachment loss, bleeding on probing, plaque index, and furcation involvement. - Radiographs are needed to assess alveolar bone loss and differentiate it from gingival edema.

Risk Factors - Smoking and inadequate oral hygiene are major risk factors for chronic periodontitis. - Systemic diseases like diabetes mellitus and HIV infection can modify the disease. - Other factors such as smoking, emotional stress, anxiety, and depression can also influence chronic periodontitis. - Age is related to the incidence of periodontal destruction, with the highest rate occurring between 50 and 60 years.

Treatment - Smoking cessation and good oral hygiene are key to effective treatment. - Correct any modifiable plaque retentive factors, such as overhangs on restorations. - Treatment can involve non-surgical and surgical therapies. - Scaling and root planing (SRP) is the typical initial treatment. - Subgingival debridement is effective in reducing pocket depth. - Open flap debridement is used in deeper pocket areas and provides better visualization of the root surface. - Guided tissue regeneration using PTFE membranes is favored by some practitioners and has a greater effect on probing measures than open flap debridement. - Enamel matrix derivative is favored by some practitioners and significantly improves attachment levels and pocket depth reduction. - Adjunctive systemic antibiotic treatment may be used in addition to debridement-based treatments and offers additional benefits. - Locally delivered adjunctive antimicrobial treatment using chemical antimicrobials can reduce bacterial load in the pocket.

Systemic Factors and Other Conditions - Chronic periodontitis is an inflammatory immune response against bacteria. - Epithelial lining ulceration in pockets may be due to systemic bacterial dissemination. - Diabetes mellitus and cardiovascular disease are associated with chronic periodontitis. - Chronic periodontitis is linked to head and neck squamous cell carcinoma. - There is little evidence linking progression of periodontal disease to low birth weight or preterm birth. - Regular scale and polish treatment does not make a difference to gingivitis, probing depths, or other oral health-related problems in adults without severe periodontitis. - There is no consistent evidence supporting the efficacy of laser treatment as an adjunct to non-surgical periodontal treatment in adults with chronic periodontitis. - Costs for tooth retention through supportive periodontal therapy are relatively low compared to alternatives like implants or bridgework.