File fracture- When too much force is given or when files are reused multiple time the file breaks in the canal.
Perforations- When the bur goes in the wrong direction its perforates the tooth.
Irrigation spills- When solutions like NaOh spills on mucous tissue it burns. Always use rubber dam.
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Overpreparation or underpreparation of the canal.
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under obturation also happens sometimes, in case of under preparation.
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Over- filling while obturation
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