Which of the following is the correct classification for proximal caries of enamel and dentin definitely at or through the dentinoenamel junction (DEJ) but less than halfway through the dentin toward the pulp?
a. C-1
b. C-2
c. C-3
d. C-4
c. The grading system suggested by Haugejorden and Slack in 1977 uses the category C-3 as the radiolucency observed penetrating the DEJ but less than halfway through the dentin to the pulp.
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