Cavities on incisal edges of anterior teeth and cusp tips of posterior teeth correspond to which class?

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Cavities located on the edges of teeth are categorized by a specific surface-based system. The incisal edge of anterior teeth and the cusp tips of posterior teeth are edge surfaces. When a lesion occurs right on those edges, it falls into the sixth class. The other classes cover pits and fissures on occlusal surfaces (Class I), proximal surfaces of posterior teeth (Class II), proximal surfaces of anterior teeth (Class III), proximal surfaces of anterior teeth that involve the incisal edge (Class IV), and the cervical third of facial or lingual surfaces (Class V). So, edge involvement—incisal edges or cusp tips—is Class VI.