HOSA Dental Terminology Practice

What is a cross-section in dentistry?

1. A fluid substance of cells

2. Cutting through a tooth perpendicular to the long axis

3. The action of swallowing

4. The fifth lobe of a maxillary first molar

The correct answer is: Cutting through a tooth perpendicular to the long axis

A cross-section in dentistry refers to the method of examining a tooth by cutting through it perpendicular to its long axis. This approach allows for an in-depth view of the internal structures of the tooth, such as the dentin, pulp, and enamel. By taking a cross-section, dental professionals can better diagnose issues like decay, cracks, or abnormalities in tooth structure that may not be evident from a surface examination. This technique is crucial for understanding the anatomy of a tooth and assessing certain dental conditions, which is why it is the correct choice. The other options refer to different concepts unrelated to the definition of a cross-section: a fluid substance of cells typically pertains to bodily fluids or tissues, the action of swallowing is a physiological process, and the fifth lobe of a maxillary first molar specifically describes a part of a tooth rather than the concept of a sectional view.