TB is a systemic, chronic granulomatous infectious disease with variable clinical presentation.
Etiology : Mycobacterium Tuberculosis, Acid-fast bacilli.
Myco.TB is aerobic, non-motile, rod shaped, non-sporing bacilli which is stained by Zeihl-Neelsen stain.
Spreads through droplet / aerosol dispersion, rarely by ingestion of unpasterised infected cow milk.
Oral cavity is a rare location of TB.
Low Income group
Low & unhygienic living conditions
Lowered host resistance
Initial infection is in childhood, spread by droplet.
Forms Ghonâ€™s Focus & Ghon’s Complex.
May be Asymptomatic. It may present with, Fever, lassitude, night sweats, Anorexia, cough sputum, weight loss Erythema nodosum.
Depending upon extent of exposure & resistance of the patient, initial infection may progress to
Symptomatic Primary TB,
Formation of Granulomatous inflammation in the lung & hilar lymph nodes.
Heals by tubercle formation (Calcified lung nodules & hilar Lymphadenopathy)
Progressive Primary TB
Reactivation of persistent bacilli in tubercles of previous infection
Characterized by tubercles, caseation necrosis, fibrosis & extension of the lesion.
Occur in long standing pulmonary or severe systemic infection
Bacteria can infect Oral tissues or Lymph nodes (Scrofula)
Majority of these lesions are secondary to the lesions in some other parts of the body
May start with a vesicle or nodule which ulcerates.
It is superficial & painful, slowly increasing in size.
Irregular lesion with ragged undermined edges, induration may be variable,often with a yellowish granular base.
Gingival involvement is rare,
Appear as diffuse, hyperemic or nodular papillary proliferation.
Major Apthous ulcer
Poses a risk to dentist due its nature of spread
Use of rubber dams, minimum use of ultrasound scalers & high speed hand pieces
Good ventilation to avoid re-circulation of air.
Dental treatment only if only an emergency.
Combination therapy: usually 3â€“4 drugs to prevent resistance, chosen from the following:
ISONIAZID, RIFAMPIN, ETHAMBUTOL, RIFABUTIN, STREPTOMYCIN, PYRAZINAMIDE
Short term chemotherapy (8 weeks with 3-4 drugs)
Prolonged therapy â€” 6 mo minimumâ€” indicated for slow growth rate of bacteria, on 2 drugs.
Increasing incidence of Mycobacterium tuberculosis drug resistance
Prevention: BCG vaccination in newborns. Questionable in adults.
It is a chronic granulomatous suppurative type of disease caused by Anaerobic, Gram + ve, non-acid fast bacteria.
These are transitional forms between bacteria & fungi
Most common are Actinomyces Israeli, A.neslundi, A. viscosus, A. odontolyticus.
Breach in continuity of the oral mucosa either because of trauma or surgery- prerequisite for Actinomyces infection.
Age & Sex- seen in adult Males
Occur due to trauma, presence of long standing carious tooth,
Can penetrate deep in to the oral mucosa due to dental plaque, calculus or gingival debris
Location- Submandibular region is the most frequent site.
Cheek, masseter & parotid gland may be involved.
Trismus is a feature before forming pus
Presence of a firm,multiple, non painful, indurated masses in the submandibular region. (Lumpy Jaw Disease)
Development of Fistulas, discharging yellow colored fluid containing the characteristic Submicroscopic Sulphur granules.
Skin around the fistula may show purplish-reddish hue. Multiple fistulas seen commonly discharging with some areas showing signs of healing.
Disfigurement of face is common in long standing cases
Yellowish fluid / pus, containing typical Sulphur granules
Ray â€“ Fungus appearance
Round/lobulated colony meshwork of filaments.
Stain with hematoxylin & peripheral club-shaped ends stain with eosin.
Medical & surgical line of therapy
Lesion should be surgically debrided and thoroughly curetted.
Antibiotic of choice is Penicillin
Given 3-4 million units IV 4th hourly for 2-4 weeks.
Patients allergic to penicillin Erythromycin is the drug of choice.
Acute contagious illness, caused by gram +ve bacillus, Corynebacterium diptheriae.
Also called Klebs Loeffler bacillus
It is transmitted by droplet infection.
Bacilli settle on the upper RT.
It produces powerful exotoxins which diffuses hematogeneously, involving heart, muscle, kidney, peripheral nerves.
Death may be caused by heart failure & airway obstruction.
Seen in children esp. in winter.
Incubation period â€“ 2days
Starts with listlessness, malaise, headache, fever, with sudden onset of sore throat.
Tonsillar area producing thick, firm, leathery, blue-white pseudomembrane.(Diphtheritic membrane)
Neck â€“ is enlarged (Bull neck), edema of pharynx, with cervical Lymphadenopathy nasal regurgitation & dyspnoea.
Laryngeal involvement produces respiratory obstruction & typical croup.
Acute interstitial nephritis
Isolate & treat aggressively
Treated with Diphtheria Antitoxin
Mild – 10,000 to 20,000
Moderate â€“ 20,000 to 40,000
Severe â€“ 50,000 to 100,000 AT.
Antibiotics like penicillin / erythromycin.