Cavities that occur exclusively in posterior teeth are:

 # Cavities that occur exclusively in posterior teeth are:

A. Class 1 cavities

B. Class 5 cavities

C. Class 2 cavities

D. Class 4 cavities

The correct answer is C. Class 2 cavities.

Based on anatomical location of carious lesion, Greene Vardiman Black (G.V. Black) classified tooth preparations into five different classes. Later an additional class, class VI was also added. Class I refers to pit and fissure lesions, whereas all other classes are smooth surface lesions.

G.V. Black's Classification of Tooth Preparations

Class I	All pit and fissure preparations. It Includes: ➤ occlusal surfaces of premolars and molars, ➤ occlusal two-thirds of the facial and lingual surfaces of molars, and ➤lingual surfaces of maxillary incisors
Class II	Preparations involving the proximal surfaces of posterior teeth  (i.e. Premolars and Molars)
Class III	Preparations involving the proximal  surfaces of anterior teeth (incisors and canine) that do not include the incisal angle
Class IV	Preparations involving the proximal surfaces of anterior teeth (incisors and canine) that include the incisal edge
Class V	Preparations on the gingival third of the facial or lingual surfaces  of all teeth
Class VI	Preparations on the incisal edges of anterior teeth  (incisors and canines) or the occlusal cusp tips of posterior teeth (premolars and molars)

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