In the classification of dental caries, what class is the caries located on the middle third of anterior teeth?

Class 3: Class 1 - single surface on posterior teeth. Class 2 - involves an inter proximal surface on a posterior tooth. Class 3 - involves an inter proximal surface of an anterior tooth (usually in the middle or incisal third). Class 4 - involves the incisal edge of an anterior tooth. Class 5 - cavity along the gum line.

One more Class...: Class vi - cusp tip caries the doc above is right on, but i thought i'd add class vi for thoroughness.

Class V : If the incisal edge is not involved.