Microorganisms or immune hypersensitivity reactions result in which of the following?

• A. Infiltration of acute or chronic inflammatory cells
• B. Hyperplasia of gingiva
• C. Increased bone density
• D. Calcification of soft tissues

Answer: (A)

Infection or immune hypersensitivity drives an inflammatory tissue response, marked by infiltration of inflammatory cells into the affected area. When microbes invade gingival tissues, neutrophils rush in during the acute phase, and if the challenge persists, mononuclear cells such as macrophages, lymphocytes, and plasma cells accumulate for a chronic inflammatory infiltrate. This buildup of acute and/or chronic inflammatory cells is the hallmark reaction to microbial stimuli or hypersensitivity, reflecting ongoing tissue defense and damage.

Gingival hyperplasia is a proliferative tissue change, not the classic hallmark of microbial or hypersensitivity-driven inflammation. Increased bone density and calcification of soft tissues are not typical primary responses to these stimuli.