Debris extrusion and foraminal deformation produced by reciprocating instruments made of thermally treated NiTi wires

Abstract

ObjectiveTo evaluate the amount of apically extruded debris, percentage of foraminal enlargement and apical foramen (AF) deformation that occurred during root canal preparation with different reciprocation systems: Reciproc, WaveOne (M-Wire), and ProDesign R (Shape Memory Technology Wire) at two different working lengths (WLs): 0.0 and 1.0 mm beyond the AF.Material and methodsThe AF of 120 root canals in 60 mesial roots of mandibular molars were photographed with stereomicroscope and randomly assigned into four groups: manual, Reciproc (REC), WaveOne (WO), and ProDesign R (PDR); subsequently, they were further subdivided according to the WL (n=15). Teeth were instrumented, coupled to a dual collecting chamber, and then another photograph of each AF was captured. Extrusion was analysed by determining the weight of extruded debris. Each AF diameter was measured in pre- and post-instrumentation images to determine deformation, which was analysed, and afterwards the final format of AFs was classified (circular/oval/deformed).ResultsWe found no significant differences when analysing each system at different WLs. When considering each WL, REC and WO showed highest extrusion values (P<.05); for AF enlargement, differences were observed only for WO, when it was used beyond the AF; differences were observed among M-Wire groups beyond the AF (P<.05). AF deformation was observed in all groups; PDR showed the lowest AF deformation values at both WLs; M-Wire groups showed 50% strain beyond the AF.ConclusionAuthors concluded that beyond the apical limit, the alloy and taper are important aspects when considering extrusion and deformation.

Effect of larger apical size on the quality of preparation in curved canals using reciprocating instruments with different heat thermal treatments

“…There are no reports on the shaping ability of PDR instruments; however, Frota et al . () reported that PDR had a lower rate of foraminal deformation in comparison to Reciproc and WaveOne, which indicates a suitable centring ability. Although the results revealed a satisfactory maintenance of the canal trajectory, it can be observed in Table that all systems had a tendency of root canal transportation towards the external root canal walls, regardless of the instrument diameter, which can also be observed in Fig.…”

“…In addition, heat-treated instruments tend to have a greater centring ability than conventional NiTi alloys(Duque et al 2017, Ozy€ urek et al 2017, B€ urklein et al 2018. There are no reports on the shaping ability of PDR instruments; however,Frota et al (2018) reported that PDR had a lower rate of foraminal deformation in comparison to Reciproc and WaveOne, which indicates a suitable centring ability.Although the results revealed a satisfactory maintenance of the canal trajectory, it can be observed in…”

Debris Apically Extruded by Two Reciprocating Systems: A Comparative Quantitative Study

“…1,11,12 However, with the development of different designs and heat treatments for nickel-titanium alloys and their consequent superelasticity, faster access to the foramen, and possible foraminal enlargement became important factors to be considered in the amount of debris that can be apically extruded. 13 With the introduction of different reciprocating single-file instrumentation systems, it is important to analyze the behavior of these instruments during root canal preparation, and an aspect lacking scientific evidence is the amount of extruded debris. 13 Therefore, this study aimed to quantify the amount of debris apically extruded after instrumentation with ProDesign R (Easy Equipamentos; Belo Horizonte, Minas Gerais, Brazil) and Reciproc Blue (VDW; Munich, Germany) reciprocating systems.…”

“…13 With the introduction of different reciprocating single-file instrumentation systems, it is important to analyze the behavior of these instruments during root canal preparation, and an aspect lacking scientific evidence is the amount of extruded debris. 13 Therefore, this study aimed to quantify the amount of debris apically extruded after instrumentation with ProDesign R (Easy Equipamentos; Belo Horizonte, Minas Gerais, Brazil) and Reciproc Blue (VDW; Munich, Germany) reciprocating systems. The null hypothesis was that the two systems would not differ in the quantity of apically extruded debris.…”

Analysis of the quality of root canal preparation and retreatment using different instruments associated or not with different irrigant agitation protocols

“…PDL uses s CM alloy and SRF utilizes a Blue alloy. BTR has a conventional NiTi alloy, and several studies have demonstrated that heat-treated NiTi have greater flexibility and better maintenance of the canal path than do conventional alloys FROTA et al, 2018;.…”