CLINCAL SUBJECTSCLINICAL SUBJECTSMCI/FMGE/NEET-PGREVIEW SERIES

Textbook of Preventive and Community Dentistry Public Health Dentistry Third Edition Ebook PDF download

Textbook of Preventive and Community Dentistry Public Health Dentistry Third Edition Ebook PDF download

Textbook of Preventive and Community Dentistry Public Health Dentistry Third Edition Ebook PDF download

Textbook of Preventive and Community Dentistry Public Health Dentistry Third Edition Ebook PDF download Agent factors: Agent is defined as a substance, living or non-living, or a force, tangible or intangible, the excessive presence or relative lack of which may initiate or perpetuate a disease process.

Disease agents are classified as:
Biological agents: These agents include virus, bacteria, fungi,rickettsiae, protozoa and metazoa. These exhibit infectivity,pathogenicity and virulence.

Nutritional agents: These can be proteins, fats, carbohydrates,vitamins, minerals and water. Any excessor deficiency results
in nutritional disorder.Physical agents: Exposure to excessive heat, cold, humidity, pressure, radiation, electricity and sound may result in illness.

Chemical agents:
Endogenous: Chemicals produced in the body such as urea, ketones, uric acid, etc.
Exogenous: Agents arising outside the human host, e.g.metals, allergens, fumes, dust and gases.

Mechanical agents: Exposure to chronic friction and other mechanical forces may result in crushing, tearing, sprain.

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