G. V. Black’s classification of Cavity of tooth
G. V. Black classified carious lesions by location. As restorations essentially conform to caries location, the cavities that require being prepared are similarly classified.
Class I: pit and fissure caries: mainly occlusal of molars or premolars, although may be buccal or palatal fissures.
Class II: proximal surfaces of molars or premolars.
Class III: proximal surfaces of incisors or canines.
Class IV: proximal surfaces of incisors or canines extending to incisal edge.
Class V: cervical cavity
Class VI: an addition to the original classification: occlusal or incisal cusp tip wear.