Impact of Contracted Endodontic Access Cavity on Shaping Ability of Hyflex Electrical Discharge Machining Single File Using Cone Beam Computed Tomography: An Ex Vivo Study

Ahmed Bayoumi; Magdy Mohamed Aly; Reham   Hassan

doi:10.3889/oamjms.2021.6623

Authors

Ahmed Bayoumi Department of Conservative Dentistry, Faculty of Dentistry, Alexandria University, Alexandria, Egypt https://orcid.org/0000-0002-9633-9951
Magdy Mohamed Aly Department of Endodontics, Faculty of Dentistry, Minia University, Minya, Egypt; Department of Endodontics, Faculty of Dentistry, Egyptian Russian University, Badr City, Egypt
Reham Hassan Department of Endodontics, Faculty of Dentistry, Minia University, Minya, Egypt; Department of Endodontics, Faculty of Dentistry, Egyptian Russian University, Badr City, Egypt https://orcid.org/0000-0003-2610-7159

DOI:

https://doi.org/10.3889/oamjms.2021.6623

Keywords:

HyFlex electrical discharge machining, Cone-beam computed tomography, Traditional access, Contracted access, Canal transportation, Centering ability, Control memory, Nickel-titanium instruments

Abstract

AIM: The aim of the study was to evaluate and compare the effect of different access cavity designs, using cone-beam computed tomography (CBCT), on root canal transportation, and centralization performed on two rooted maxillary premolars.

METHODS: Twenty maxillary premolars were randomly divided into two groups. In Group 1, traditional endodontic cavities (TECs) were prepared. In Group 2, contracted endodontic cavities (CECs) were prepared. Mechanical preparation was done by HyFlex electrical discharge machining (EDM) single file in both groups. CBCT imaging was performed pre- and post-root canal preparation for calculations of root canal transportation and centering ability.

RESULTS: Data were analyzed using Mann–Whitney U test and Kruskal–Wallis test. For transportation, teeth with CECs showed the statistically significantly highest median amount of transportation, while as for centering ability, results showed no significant difference between both groups.

CONCLUSION: Under the conditions of this study, HyFlex EDM prepared canals with different access cavity designs without significant shaping errors. TEC showed less transportation than CEC, while both TEC and CEC had no effect on the file centering ability.

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