Histological Analysis Of The Cleaning Capacity Of Nickel‐Titanium Rotary Instrumentation With Ultrasonic Irrigation In Root Canals

Abstract

This study evaluated, histologically and morphometrically, the cleaning capacity of rotary instrumentation in root canals using the Profile system with ultrasonic irrigation. Twelve single-rooted mandibular incisors were divided randomly into three groups according to the irrigation method tested. The canals in the teeth were instrumented using Orifice Shapers, taper 0.6 and 0.4 in the cervical third, and up to a #35 file in the apical third. One per cent sodium hypochlorite was used as the irrigating solution. Group I: canals were irrigated with 5 ml of solution, using a Luer-Lok syringe, between each file. Group 2: canals were irrigated with the solution and instrumented using ultrasound for I min between each file. Group 3: canals were irrigated with 5 ml of solution with Luer-Lok syringe, between each file, and final irrigation using ultrasound for 3 min. After chemo-mechanical preparation, the apical thirds of the teeth were submitted for histological processing. Morphometric analysis was performed using an optical microscope with 40x magnification and a grid. The results showed statistical difference at the 5% level between the methods used for irrigation. Rotary instrumentation with Profile system NiTi files and ultrasonic irrigation for 3 min was more effective in cleaning root canals when the different methods were compared.

Filling Material Removal with Reciprocating and Rotary Systems Associated with Passive Ultrasonic Irrigation

“…Despite the lower content of irrigating solution used during root canal retreatment with the RS, the ultrasonic activation performed at the end of the reinstrumentation optimized the remaining filling material removal, even in critical areas, such as the apical portion (16)(17)(18).…”

Sonic versus ultrasonic activation for the cleaning of the root canal after post space preparation: an in vitro study.

“…Its aim was to analyze different methods of intracanal cleaning after unblocking on endodontically treated teeth and prior to cementation of prosthetic posts; bearing in mind that the coronal third is more accessible for proper cleaning, the apical third is not entirely unblocked for this type of rehabilitation and that the middle third will be in full contact with the post, the cuts observed with the SEM are at an average level between the coronal and apical levels; as it is in this third where there is an influence of cleaning on teeth restored with posts. With respect to the time assigned for irrigation, Ferreira et al 11 state that the final irrigation of CHX done during 3-5 minutes produces a greater removal of debris, and that the shorter the irrigation time the less effective the removal. While some authors suggest a longer irrigation time, irrigation during 60 seconds (1 minute) with inactivated CHX results in a decrease of debris in the area, and when it is activated and applied during the same amount of time, its cleaning effect is even better.…”

Newer Endodontic irrigation devices: An update

“…1,2 This can be achieved through chemomechanical debridement but because of the intricate nature of root canal anatomy it is impossible to shape and clean the root canal completely. 3 All the instrumentation systems as well as current advancements in the instruments like nickel-titanium instruments and rotary can only clean the central body of the canal. Rest of the canal structures like canal fins, isthmi, and cul-de-sacs are untouched after completion of the preparation.…”