Table 1.

Criteria for the scores of the histological caries lesion depth [[4]]

Score	Visual criteria	Histological criteria
0	No or slight change in enamel after prolonged air drying	Sound
1	Opacity or discoloration hardly visible on wet surface but distinct after air drying	Caries/Radiolucency extending to the outer half of the enamel
2	Opacity distinctly visible without air drying	Caries/Radiolucency extending to the inner half of the enamel or the outer third of dentine
3	Localized enamel break- down in opaque or discolored enamel and/or grayish discoloration from the under lying dentine	Caries/Radiolucency extending to the middle third of the dentine
4	Cavitation in opaque or discolored enamel exposing the dentine	Caries/Radiolucency extending to the inner third of the dentine

These criteria were used as golden standard values of the dissected teeth.