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What is According to weins modification of the working length determination if bone resorption is there then: and explain in detail?
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