Which class in Black's classification involves a single surface in a pit or fissure?

In Black's classification of dental caries, Class 1 refers specifically to cavities that occur on a single surface in a pit or fissure area of a tooth. This classification is primarily applied to the occlusal surfaces of molars and premolars, as well as the lingual surfaces of anterior teeth where these features are prominent. It is designed to simplify the identification and management of carious lesions based on their location and extent.

Understanding this classification is essential for dental professionals, as it guides treatment planning and the selection of appropriate restorative materials. Class 1 cavities are often less extensive than those classified as Class 2 or higher, which involve more complex surfaces or multiple surfaces of the teeth. This distinction is crucial for determining the most effective and least invasive treatment options available for patients.