Measurement of strain on tooth roots during post removal w

1. Roots with thin dentine walls were more prone to root fracture during post removal.
2. The Eggler post remover can be used to remove cast posts/cores from teeth with minimal risk of root fracture when applied correctly.
3. Tooth damage may occur if the Eggler device is applied at an angle to the long axis of the tooth root. Care should be taken to ensure that the device is correctly aligned along the long axis of the tooth and the repeller arms contact the mesial and distal dentine surfaces uniformly and simultaneously. Point stresses or shear stresses in the dentine near the repeller arms may occasionally initiate root fracture due to incorrect positioning of the repeller arms.