The canal system is also significant because it forms an anatomical pathway for the egress of irritants beyond the apical foramen.6 Therefore, the cementodentinal junction is considered as the ideal end point of endodontic instrumentation and obturation.
Although, it is considered as a standard measure for endodontic instrumentation in the dentinal portion of root canal but it is difficult to achieve because the of variation of major foramen relation with the cementodentinal junction.
Cemental Crack radiating from the cemental surface to the cementodentinal
junction and into the dentine.
A cemental tear is defined as an incomplete or complete separation within root surface along the cementodentinal tissue or along an incremental line (1-3).
Persistent endodontic lesion due to complex cementodentinal tears in a maxillary central incisor: a case report.
At the apical foramen, the cementodentinal
junction (CDJ) or minor constriction is the landmark that anatomically and histologically determines where the pulp ends and the periodontal ligament begins.
Pascon et al, recommended that working length taken by electronic apex locator should be confirmed by radiographs to decrease errors in working length determination.14 Benefits of combined methods are reduction in the number of radiographs required for working length determination, reduced procedure time, reduced radiation exposure to the patient, instead of determination of working length to the radiographic apex, apex locator are able to measure canal to apical constriction, cementodentinal
junction or apical foramen and radiographs are advantageous to inspect root anatomy and can be documented in patients record.
In addition, one might expect a prolonged healing period and lower success rate due to incomplete regeneration of cementum, periodontal ligament, and alveolar bone.8,9,10,11 In 1955, Kutler stated that the ideal place to end root canal treatment was the cementodentinal
junction.12 It is where the pulp tissue changes into the periapical tissue13 as it is a histological landmark, which cannot be felt clinically or seen radiographically.