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1962 Radiology

A male 35 year old presents to the clinic with blackening and pain in upper anterior tooth. He also told that trauma to the tooth occurred 5 months ago. Intraoral findings reveal non-vital tooth #21. RCT was started and IOPA #21 taken for initial working length. After initial debridement of the canal was performed, another X-ray was captured with the initial root length measured and it appears that the file is approximately 4 mm from the apex. How could the doctor have obtained a more accurate initial length measurement?

AIncreasing the vertical angulation of the cone in relation to the film
BDecreasing the vertical angulation of the cone in relation to the film
CDecreasing the horizontal angulation of the cone in relation to the film
DIncreasing the horizontal angulation of the cone in relation to the film
Radiology
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