While preparing the proximal box, the mesiodistal width of the ditch should be:
Correct Answer: 0.8 mm ; two thirds in dentin and one third at the expense of enamel
Description: Proximal Box
If the bur is allowed to cut only dentin, the resulting axial wall would be too deep. The mesiodistal width of the ditch should be 0.8 mm (the tip diameter of the bur) and prepared approximately two thirds (0.5 mm) at the expense of dentin and one third (0.3 mm) at the expense of enamel.
Sturdevant operative dentistry 7th Edition, Page No:e99
Category:
Dental
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