Morphometrical analysis of cleaning capacity of a hybrid instrumentation in mesial flattened root canals

Abstract

The cleaning capacity of hybrid and rotary instrumentation techniques in mesial flattened canals of mandibular first molars was evaluated by morphometrical analysis in this study. Twenty human mandibular first molars were randomly assigned into two groups, according to instrumentation technique, as follows: group 1, instrumentation with ProTaper Starter Kit (Dentsply/Maillefer) rotary system; group 2, manual instrumentation using K files (Dentsply/Maillefer) by crown-down technique in middle and apical thirds, cervical preparation with Gates-Glidden #1 and #2 (Dentsply/Maillefer) burs, and to finalise the preparation, ProTaper F2 and F3 rotary files. Serial transverse cross-sections (5 µm) of the apical third, stained with hematoxylin and eosin, were analysed at 100× original magnification. The images were submitted to morphometrical analysis with an integration grid to determine the percentage of root canal area with debris. Statiscal analysis (t-Student, P < 0.05) showed significant difference between the techniques (P < 0.05), although neither completely cleaned the root canal.

Cleaning capacity of hybrid instrumentation technique using reamer with alternating cutting edges system files: Histological analysis

“…[1114] To standardize the results, the specimens were embedded in an acrylic resin base to simulate the oral cavity during routine endodontic treatment. [61122]…”

“…Thus, it is imperative to find ways to promote effective cleaning using the smallest apical diameter possible. [71126]…”

“…[2714] There are residual bacteria and other microorganisms both in these difficult-to-access areas and in the dentinal tubules. [11] The 2.5% sodium hypochlorite was used as the irrigation solution in the present study due to its antimicrobial properties and high solvency for organic material. [111214]…”

“…[78910] Modifications in the internal anatomy of the tooth contribute to the success or failure of endodontic treatment because debris may remain attached to the dentine walls, isthmus areas, and ramifications of severely curved or flattened root canals. [37111213]…”

“…[14] Performing endodontic treatment in these teeth is moderately complex, particularly during chemomechanical preparation. [111214]…”