Comparative study on the shaping ability and cleaning efficiency of rotary Mtwo instruments. Part 2. Cleaning effectiveness and shaping ability in severely curved root canals of extracted teeth

Abstract

Under the conditions of this study, Mtwo instruments resulted in good cleaning and maintained the original curvature significantly better than K3 or RaCe files.

Influence of Root Canal Curvature on Wall Cleanliness in the Apical Third during Canal Preparation

“…The PTN and R systems, both composed of M-Wire alloy, were selected to provide both reciprocating and rotary instruments, while avoiding any influence of variations in the alloy metallurgy. Moreover, according to the main objective of this study, a simplified irrigation protocol with only sodium hypochlorite was used, without irrigation activation devices and chelating agents (15,18). This permitted non-interference with the real cleaning efficiency of the evaluated instruments.…”

“…The apical patency was verified between each instrument by means of a manual K file (size 10) inserted beyond the apical foramen. To permit a comparison between experimental groups and to avoid any influence of irrigation on the results of this study, the irrigation protocol was standardised and simplified with only sodium hypochlorite as follows: a 2 mL sodium hypochlorite solution at a concentration of 5.25% was delivered between each instrument using a plastic syringe with needle of size 30 (Ultradent Products Inc., South Jordan, Utah, USA) progressively to 1 mm from the WL (15,18).…”

Süt Di̇şleri̇nde Ni̇kel Ti̇tanyum Döner Aletleri̇ni̇n Kullaniminin Değerlendi̇ri̇lmesi̇

“…Kesme etkinlikleri, çalışma boyunu ve kanal kurvatürünü korumaları diğer döner aletlerden üstün özellikleri arasındadır. 42,43 Araştırmalarda kanal formunu K3, Race ve Protaper aletlerinden daha iyi koruduğu görülmüştür. 45 Mohammed Azar ve ark 46 70 adet süt ve 70 adet daimi azı dişi kullanarak gerçekleştirdikleri çalış-malarında, Mtwo ve K tipi eğelerinin temizleme etkinliklerini ve çalışma sürelerini değerlendirmişlerdir.…”

Shaping Ability of NiTi Rotary versus Stainless-Steel Hand Instruments in Curved Root Canals of Extracted Teeth

“…A number of studies have compared shaping ability of NiTi rotary instruments versus stainless steel hand files either in simulated curved canals of resin blocks or in curved root canals of extracted teeth. (1)(2)(3)(4)(5)(6)(7)(8)(9)(10) Comparing the shaping ability of different instruments in standardized root canals of resin blocks do not reflect the action of the instruments in root canals of real teeth. (11) Thus, studies using real root canals in extracted teeth are required in order to fully assess the cleaning and shaping efficiency of root canal instruments.…”

“…(11) Thus, studies using real root canals in extracted teeth are required in order to fully assess the cleaning and shaping efficiency of root canal instruments. (5) Recently, shaping ability of two new NiTi rotary Mtwo and FlexMaster systems were compared with stainless steel hand K-Flexofiles in simulated curved canals. (3) The primary aim of this in-vitro study was to compare shaping ability of NiTi rotary Mtwo and Flex Master with stainless steel hand K-Flexofile in curved root canals of extracted teeth with a more exact method than generally used in endodontic research.…”