To Evaluate The Apical Microleakage And Vertical Root Fracture Resistance Of Root Canals After Retrieval And Non-Retrieval Of Separated Instrument- An In Vitro Study

Abstract

Introduction: A satisfactory clinical outcome depends on cleaning and shaping thoroughly that is a crucial phase in the endodontic treatment process. An endodontic equipment break leads to under-filling of the root canal by impeding efficient cleaning and shaping. Retrieval and non-retrieval of separated instrument may affect the outcome.

Objective: The current research aims to analyse the root canals resistance to tooth fracture and microleakage following the retrieval or non-retrieval of a separated instrument

Materials and Method: 96 recently extracted single-rooted teeth were segregated  into experimental groups (n=34) based on whether the separated instrument was recovered or not, and two control groups (n=14) each. For microleakage evaluation and vertical fracture resistance, each experimental group and control group was additionally subdivided into 2 subgroups experimental (n=17) and 2 control (n=7). Evaluation of microleakage was done using dye penetration method & Vertical fracture resistance using UTM.

Results: The highly significant difference was seen between various groups. No significant difference was seen in Experimental groups i.e Group A₁ and Group B₁. Group-C₁ showed the highest mean depth of dye penetration followed by Group-A₁, Group-B₁ and Group-D_1. Group D₂ showed highest vertical fracture resistance followed by Group A₂, Group C₂ and Group B₂ respectively.

Conclusion: No considerable difference was found for microleakage in the cases of retrieving a broken instrument from apical part and those in which it was not. Retrieval of broken instrument in the apical third using ultrasonic tips significantly decrease the VFR of tooth.  For better outcomes, bioceramic sealer can be utilised to obturate root canals that contain fractured instruments.