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GE involves integrating cone-beam computed tomography (CBCT) of the affected tooth with a digital impression of the maxillary\/mandibular arch, allowing for careful planning of the drilling path to the RC system through a three-dimensional (3D) static guide. This article reports four cases of teeth with PCO\/RCO, accompanied by additional diagnoses of internal and external root resorption and horizontal tooth fracture, all successfully treated with GE. 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