DentistryOral SurgeryPeriodonticsApical PeriodontitisRoot Canal TherapyApical SurgeryManagement Of Symptomatic Apical PeriodontitisRoot Canal AnatomyRoot Canal ObturationRoot PlaningRoot-end ResectionManagement Of Apical PeriodontitisRefractory Apical PeriodontitisRoot Apex AnatomyRoot Canal InvolvementRoot Canal Morphology AnalysisRoot Canal Morphology ClassificationRoot Canal System MorphologyRoot Resection