National Dental Assisting Examining Board (NDAEB) Practice Exam

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Prepare for the National Dental Assisting Exam with comprehensive quiz questions, including multiple choice and detailed explanations. Equip yourself for success!

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Which type of lesion extends above the mucosal surface?

Cyst
Blister
Ulcer
Patch

The correct answer is: Blister

A blister is a type of lesion characterized by a raised area that is filled with fluid and extends above the level of the surrounding mucosal surface. This elevation is typically caused by the accumulation of fluid between the layers of the skin or mucosa due to various factors such as friction, burns, or infections. The presence of fluid in the blister makes it appear swollen and protruding. In contrast, a cyst is a closed sac-like structure that can be filled with fluid, air, or other material, but it does not necessarily extend above the surface to the same extent as a blister. Ulcers represent a loss of continuity of the epithelium that is usually flat with an excavated area rather than elevated. A patch refers to a change in the mucosal surface that may appear flat and is not typically raised above the surrounding tissues. Therefore, the characteristic elevation and fluid-filled nature of a blister make it the correct answer to the question regarding which type of lesion extends above the mucosal surface.