According to weins modification of the working length determination if bone resorption is there then:
Correct Answer: Reduce the length by 1.5mm.
Description: Wein modification of working length determination by radiograph:
1. Reduce length by 1 mm if NO root + bone resorption
2. Reduce length by 1.5 mm if bone resorption
3. Reduce length by 2 mm if both root and bone resorption
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