Define the causes of instrument fracture, Biology

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Define the Causes of Instrument Fracture

Too much apical pressure ( specially in narrow or curved canal)
Used in dry canal without irrigation or lubricant
Excessive frictional stress on instrument( hand file should not exceed ¼ turn inside the canal never full turn because it is going to fracture)

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Flute design that build up dentin shaving
Inadequate access cavity exhibited deflect the instrument
Root canal complexity e.g. severe root curvature
Negotiate apical blockage or calcified canal

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