Fig. 6.

Clinical case of approximal caries in lower second premolar.

A. Clinical view. Cavitation of distal enamel is obvious in second premolar; however, detection of caries in mesial proximal surface is not evident.

B. X-ray image. Increase in radiolucency at proximal contacts is not evident in second premolar.

C1. SS-OCT image of approximal contacts between first and second premolars. Scanning from occlusal surface. Distinct white line indicates the presence of caries with cavitation (arrow).

C2. SS-OCT image of approximal contacts between second premolar and first molar. Scanning from occlusal surface. Distinct white line indicates the presence of caries with cavitation (arrow). Cross-sectional imaging of first molar is impossible because of the metal inlay.

D. Clinical view after cavity preparation. Presence of dentin caries in the mesial and distal proximal surfaces is confirmed.