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NEET MDS Synopsis - Lecture Notes
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📖 Periodontology

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PERIOTEST Device in Periodontal Assessment
Periodontology

PERIOTEST Device in Periodontal Assessment

The PERIOTEST device is a valuable tool used in dentistry to assess the mobility of teeth and the reaction of the periodontium to applied forces. This lecture covers the principles of the PERIOTEST device, its measurement scale, and its clinical significance in evaluating periodontal health.

Function: The PERIOTEST device measures the reaction of the periodontium to a defined percussion force applied to the tooth. This is done using a tapping instrument that delivers a controlled force to the tooth.

Contact Time: The contact time between the tapping head and the tooth varies between 0.3 and 2 milliseconds. This duration is typically shorter for stable teeth compared to mobile teeth, allowing for a quick assessment of tooth stability.

PERIOTEST Scale

The PERIOTEST scale ranges from -8 to +50, with specific ranges indicating different levels of tooth mobility:

Readings Inference
-8 to 9 Clinically firm teeth
10 to 19 First distinguishable sign of movement
20 to 29 Crown deviates within 1 mm of its normal position
30 to 50 Mobility is readily observed

Clinical Significance

Assessment of Tooth Mobility:
The PERIOTEST device provides a quantitative measure of tooth mobility, which is essential for diagnosing periodontal disease and assessing the stability of teeth.

Correlation with Other Measurements:
The PERIOTEST values correlate well with:

  • Tooth Mobility Assessed with a Metric System: This allows for a standardized approach to measuring mobility, enhancing the reliability of assessments.

  • Degree of Periodontal Disease and Alveolar Bone Loss: Higher mobility readings often indicate more severe periodontal disease and greater loss of supporting bone, making the PERIOTEST a useful tool in monitoring disease progression.

Treatment Planning:
Understanding the mobility of teeth can aid in treatment planning, including decisions regarding periodontal therapy, splinting of mobile teeth, or extraction in cases of severe mobility.

Periodontal Medications
Periodontology

Periodontal Medications and Their Uses

Periodontal medications play a crucial role in the management of periodontal diseases, aiding in the treatment of infections, inflammation, and tissue regeneration. Understanding the various types of medications and their specific uses is essential for effective periodontal therapy.

Types of Periodontal Medications

  1. Antibiotics:

    • Uses:
      • Used to treat bacterial infections associated with periodontal disease.
      • Commonly prescribed antibiotics include amoxicillin, metronidazole, and doxycycline.
    • Mechanism:
      • They help reduce the bacterial load in periodontal pockets, promoting healing and reducing inflammation.

  2. Antimicrobial Agents:

    • Chlorhexidine:
      • Uses: A topical antiseptic used as a mouth rinse to reduce plaque and gingivitis.
      • Mechanism: It disrupts bacterial cell membranes and inhibits bacterial growth.
    • Tetracycline:
      • Uses: Can be used topically in periodontal pockets to reduce bacteria.
      • Mechanism: Inhibits protein synthesis in bacteria, reducing their ability to cause infection.

  3. Anti-Inflammatory Medications:

    • Non-Steroidal Anti-Inflammatory Drugs (NSAIDs):
      • Uses: Used to manage pain and inflammation associated with periodontal disease.
      • Examples: Ibuprofen and naproxen.
    • Corticosteroids:
      • Uses: May be used in severe cases to reduce inflammation.
      • Mechanism: Suppress the immune response and reduce inflammation.

  4. Local Delivery Systems:

    • Doxycycline Gel (Atridox):
      • Uses: A biodegradable gel that releases doxycycline directly into periodontal pockets.
      • Mechanism: Provides localized antibiotic therapy to reduce bacteria and inflammation.
    • Minocycline Microspheres (Arestin):
      • Uses: A localized antibiotic treatment that is placed directly into periodontal pockets.
      • Mechanism: Releases minocycline over time to combat infection.

  5. Regenerative Agents:

    • Bone Grafts and Guided Tissue Regeneration (GTR) Materials:
      • Uses: Used in surgical procedures to promote the regeneration of lost periodontal tissues.
      • Mechanism: Provide a scaffold for new tissue growth and prevent the ingrowth of epithelium into the defect.

  6. Desensitizing Agents:

    • Fluoride Varnishes:
      • Uses: Applied to sensitive areas to reduce sensitivity and promote remineralization.
      • Mechanism: Strengthens enamel and reduces sensitivity by occluding dentinal tubules.

Clinical Significance of Periodontal Medications

  1. Management of Periodontal Disease:

    • Medications are essential in controlling infections and inflammation, which are critical for the successful treatment of periodontal diseases.

  2. Adjunct to Non-Surgical Therapy:

    • Periodontal medications can enhance the effectiveness of non-surgical treatments, such as scaling and root planing, by reducing bacterial load and inflammation.

  3. Surgical Interventions:

    • In surgical procedures, medications can aid in healing and regeneration, improving outcomes for patients undergoing periodontal surgery.

  4. Patient Compliance:

    • Educating patients about the importance of medications in their treatment plan can improve compliance and overall treatment success.
Pathogens Implicated in Periodontal Diseases
Periodontology

Pathogens Implicated in Periodontal Diseases

Periodontal diseases are associated with a variety of pathogenic microorganisms. Below is a list of key pathogens implicated in different forms of periodontal disease, along with their associations:

General Pathogens Associated with Periodontal Diseases

  • Actinobacillus actinomycetemcomitans:

    • Strongly associated with destructive periodontal disease.

  • Porphyromonas gingivalis:

    • A member of the "black pigmented Bacteroides group" and a significant contributor to periodontal disease.

  • Bacteroides forsythus:

    • Associated with chronic periodontitis.

  • Spirochetes (Treponema denticola):

    • Implicated in various periodontal conditions.

  • Prevotella intermedia/nigrescens:

    • Also belongs to the "black pigmented Bacteroides group" and is associated with several forms of periodontal disease.

  • Fusobacterium nucleatum:

    • Plays a role in the progression of periodontal disease.

  • Campylobacter rectus:

    • These organisms include members of the new genus Wolinella and are associated with periodontal disease.

Principal Bacteria Associated with Specific Periodontal Diseases

  1. Adult Periodontitis:

    • Porphyromonas gingivalis
    • Prevotella intermedia
    • Bacteroides forsythus
    • Campylobacter rectus

  2. Refractory Periodontitis:

    • Bacteroides forsythus
    • Porphyromonas gingivalis
    • Campylobacter rectus
    • Prevotella intermedia

  3. Localized Juvenile Periodontitis (LJP):

    • Actinobacillus actinomycetemcomitans
    • Capnocytophaga

  4. Periodontitis in Juvenile Diabetes:

    • Capnocytophaga
    • Actinobacillus actinomycetemcomitans

  5. Pregnancy Gingivitis:

    • Prevotella intermedia

  6. Acute Necrotizing Ulcerative Gingivitis (ANUG):

    • Prevotella intermedia
    • Intermediate-sized spirochetes
Microbes in Periodontics
Periodontology

Microbes in Periodontics

Bacteria Associated with Periodontal Health

  • Primary Species:

    • Gram-Positive Facultative Bacteria:
      • Streptococcus:
        • S. sanguis
        • S. mitis
        • A. viscosus
        • A. naeslundii
      • Actinomyces:
        • Beneficial for maintaining periodontal health.

  • Protective or Beneficial Bacteria:

    • Key Species:
      • S. sanguis
      • Veillonella parvula
      • Corynebacterium ochracea
    • Characteristics:
      • Found in higher numbers at inactive periodontal sites (no attachment loss).
      • Low numbers at sites with active periodontal destruction.
      • Prevent colonization of pathogenic microorganisms (e.g., S. sanguis produces peroxide).

  • Clinical Relevance:

    • High levels of C. ochracea and S. sanguis are associated with greater attachment gain post-therapy.

Microbiology of Chronic Plaque-Induced Gingivitis

  • Composition:

    • Roughly equal proportions of:
      • Gram-Positive: 56%
      • Gram-Negative: 44%
      • Facultative: 59%
      • Anaerobic: 41%

  • Predominant Gram-Positive Species:

    • S. sanguis
    • S. mitis
    • S. intermedius
    • S. oralis
    • A. viscosus
    • A. naeslundii
    • Peptostreptococcus micros

  • Predominant Gram-Negative Species:

    • Fusobacterium nucleatum
    • Porphyromonas intermedia
    • Veillonella parvula
    • Haemophilus spp.
    • Capnocytophaga spp.
    • Campylobacter spp.

  • Pregnancy-Associated Gingivitis:

    • Increased levels of steroid hormones and P. intermedia.

Chronic Periodontitis

  • Key Microbial Species:

    • High levels of:
      • Porphyromonas gingivalis
      • Bacteroides forsythus
      • Porphyromonas intermedia
      • Campylobacter rectus
      • Eikenella corrodens
      • Fusobacterium nucleatum
      • Actinobacillus actinomycetemcomitans
      • Peptostreptococcus micros
      • Treponema spp.
      • Eubacterium spp.

  • Pathogenic Mechanisms:

    • P. gingivalis and A. actinomycetemcomitans can invade host tissue cells.
    • Viruses such as Epstein-Barr Virus-1 (EBV-1) and human cytomegalovirus (HCMV) may contribute to bone loss.

Localized Aggressive Periodontitis

  • Microbiota Characteristics:
    • Predominantly gram-negative, capnophilic, and anaerobic rods.
    • Almost all localized juvenile periodontitis (LJP) sites harbor A. actinomycetemcomitans, which can comprise up to 90% of the total cultivable microbiota.