Periodontal Diseases Associated with Neutrophil Disorders

1. Acute Necrotizing Ulcerative Gingivitis (ANUG)

   • Description: A severe form of gingivitis characterized by necrosis of the interdental papillae, pain, and foul odor.
   • Association: Neutrophil dysfunction can exacerbate the severity of ANUG, leading to rapid tissue destruction.

2. Localized Juvenile Periodontitis

   • Description: A form of periodontitis that typically affects adolescents and is characterized by localized bone loss around the permanent teeth.
   • Association: Impaired neutrophil function contributes to the pathogenesis of this condition.

3. Prepubertal Periodontitis

   • Description: A rare form of periodontitis that occurs in children before puberty, leading to rapid attachment loss and bone destruction.
   • Association: Neutrophil disorders can play a significant role in the development and progression of this disease.

4. Rapidly Progressive Periodontitis

   • Description: A form of periodontitis characterized by rapid attachment loss and bone destruction, often occurring in young adults.
   • Association: Neutrophil dysfunction may contribute to the aggressive nature of this disease.

5. Refractory Periodontitis

   • Description: A form of periodontitis that does not respond to conventional treatment and continues to progress despite therapy.
   • Association: Neutrophil disorders may be implicated in the persistent nature of this condition.

• Alpha Thalassemia: Caused by deletion of alpha genes
• HbH Disease: Deletion of 3 alpha chains

Important Periodontal Indices

PMA Index

• Purpose: Assessment of gingival disease status
• Components: Papillary (P), Marginal (M), and Attached (A) gingiva scoring

Ramfjord Index

• Selected Teeth: 16, 21, 24, 36, 41, 44
• Rationale: Representative sampling of entire dentition

Merin's Classification

• Application: Patient recall scheduling based on periodontal status
• Categories: Maintenance intervals based on disease severity

Clinical Measurements

Gingival Sulcus Depth

• Primary Teeth: 1-2mm (shallower than permanent teeth)
• Permanent Teeth: 2-3mm in health

Level of Attachment

• Definition: Distance from cementoenamel junction (CEJ) to pocket base
• Clinical Significance: True measure of periodontal support loss

Fremitus Test

• Purpose: Diagnosis of tooth mobility
• Technique: Palpation during functional movements

• GTR Membrane Placement:
  • Apical border: 3 – 4 mm below defect margin.
  • Lateral extension: 2 – 3 mm beyond defect.
• Root Surface Biomodification: Citric acid (pH 1.0) for 2 – 5 min.
• Enamel Matrix Derivative: Emdogain (from porcine teeth).
• Cervical Enamel Projections: Seen in 8.6 – 28.6% of molars.
• Smoking: Preventable risk factor; damages cilia via hydrogen cyanide.

Effects of Smoking on the Etiology and Pathogenesis of Periodontal Disease

Smoking is a significant risk factor for the development and progression of periodontal disease. It affects various aspects of periodontal health, including microbiology, immunology, and physiology. Understanding these effects is crucial for dental professionals in managing patients with periodontal disease, particularly those who smoke.

Etiologic Factors and the Impact of Smoking

1. Microbiology

   • Plaque Accumulation:
     • Smoking does not affect the rate of plaque accumulation on teeth. This means that smokers may have similar levels of plaque as non-smokers.
   • Colonization of Periodontal Pathogens:
     • Smoking increases the colonization of shallow periodontal pockets by periodontal pathogens. This can lead to an increased risk of periodontal disease.
     • There are higher levels of periodontal pathogens found in deep periodontal pockets among smokers, contributing to the severity of periodontal disease.

2. Immunology

   • Neutrophil Function:
     • Smoking alters neutrophil chemotaxis (the movement of neutrophils towards infection), phagocytosis (the process by which neutrophils engulf and destroy pathogens), and the oxidative burst (the rapid release of reactive oxygen species to kill bacteria).
   • Cytokine Levels:
     • Increased levels of pro-inflammatory cytokines such as Tumor Necrosis Factor-alpha (TNF-α) and Prostaglandin E2 (PGE2) are found in the gingival crevicular fluid (GCF) of smokers. These cytokines play a role in inflammation and tissue destruction.
   • Collagenase and Elastase Production:
     • There is an increase in neutrophil collagenase and elastase in GCF, which can contribute to the breakdown of connective tissue and exacerbate periodontal tissue destruction.
   • Monocyte Response:
     • Smoking enhances the production of PGE2 by monocytes in response to lipopolysaccharides (LPS), further promoting inflammation and tissue damage.

3. Physiology

   • Gingival Blood Vessels:
     • Smoking leads to a decrease in gingival blood vessels, which can impair the delivery of immune cells and nutrients to the periodontal tissues, exacerbating inflammation.
   • Gingival Crevicular Fluid (GCF) Flow:
     • There is a reduction in GCF flow and bleeding on probing, even in the presence of increased inflammation. This can mask the clinical signs of periodontal disease, making diagnosis more challenging.
   • Subgingival Temperature:
     • Smoking is associated with a decrease in subgingival temperature, which may affect the metabolic activity of periodontal pathogens.
   • Recovery from Local Anesthesia:
     • Smokers may require a longer time to recover from local anesthesia, which can complicate dental procedures and patient management.

Clinical Implications

1. Increased Risk of Periodontal Disease:

   • Smokers are at a higher risk for developing periodontal disease due to the combined effects of altered microbial colonization, impaired immune response, and physiological changes in the gingival tissues.

2. Challenges in Diagnosis:

   • The reduced bleeding on probing and altered GCF flow in smokers can lead to underdiagnosis or misdiagnosis of periodontal disease. Dental professionals must be vigilant in assessing periodontal health in smokers.

3. Treatment Considerations:

   • Smoking cessation should be a key component of periodontal treatment plans. Educating patients about the effects of smoking on periodontal health can motivate them to quit.
   • Treatment may need to be more aggressive in smokers due to the increased severity of periodontal disease and the altered healing response.

4. Monitoring and Maintenance:

   • Regular monitoring of periodontal health is essential for smokers, as they may experience more rapid disease progression. Tailored maintenance programs should be implemented to address their specific needs.

• Attached Gingiva Width:
  • Maxillary incisors: 3.5 – 4.5 mm
  • Mandibular incisors: 3.3 – 3.9 mm
  • Least in premolars (~1.8 – 1.9 mm)
• Cementum:
  • Thickest in apical third and furcation (150 – 200 µm)
  • Acellular cementum: cervical third
  • Cellular cementum: forms after occlusal contact
• PDL Fibres:
  • Principal: Type I collagen
  • Reticular: Type III collagen
  • Oblique fibres: Largest group, resist vertical forces
  • Transseptal fibres: Reconstructed post bone loss
  • Alveolar crest fibres: Prevent extrusion