Dr. G.V. Black's classification system categorizes dental cavities into 5 classes based on their location. Class I cavities are located on occlusal surfaces. Class II cavities are on proximal surfaces of bicuspids and molars. Class III cavities are on proximal surfaces of anterior teeth not involving the incisal angle, while Class IV cavities do involve the incisal angle. Class V cavities are found on the gingival third of facial and lingual surfaces. W.J. Simon later added Class VI for lesions on incisal edges and cusp tips.

1. CLASSIFICATION OF CAVITIES FOR
AMALGAM RESTORATION
According to Dr.G.V. Black’s Classification: -
CLASS-I: -Lesions are pit and fissure caries on the
occlusal surfaces of premolars and molars, the occlusal
two-third of the buccal and lingual surfaces of molars, and
the lingual surfaces of maxillary incisors.
CLASS-II: -Lesions are found on the proximal surfaces of
bicuspids and molars.

2. CLASS-III: -Lesions are found on the proximal surfaces of
anterior teeth that do not involve the incisal angle.
CLASS-IV: -Lesions are found on the proximal surfaces of
anterior teeth that involves incisal angles.

3. CLASS-V: -Lesions are found on the gingival third of the
facial and lingual surfaces of all the teeth.
ACCORDING TO W.J. SIMON’S
MODIFICATION OF DR.G.V. BLACK’S
CLASSIFICATION : -
CLASS-VI: - Lesions are found on the incisal edges
and cusp tips.