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_Class 1: Small invasive resorptive lesion with shallow penetration into dentine. 

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_Class 2: Well-defined invasive resorptive lesion close to the coronal pulp chamber. 

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_Class 3: Deeper invasion extending into the coronal third of radicular dentine. 

_Class 4: A large invasive lesion extending beyond the coronal third of the root. 

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© 2015 José Antonio Gonzalez Sánchez / Universidad Internacional de Cataluña

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