Shaping ability of single versus multi file rotary Ni-Ti systems in curved root canals

Ghobashy, Ahmed; Nagy, MM; Obeid, MF

doi:10.4103/1687-8574.188910

Cited by 3 publications

(1 citation statement)

References 3 publications

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“…ProTaper Next rotary system was employed for mechanical preparation to remove pulp tissue, standardize the canal diameter and provide a more predictable preparation form while also increasing procedural efficiency [35,36] . This is because of the offset mass rotation motion, which produces a unique asymmetrical rotary motion and at any given crosssection the file only touches the wall at two points; which gives the advantage of reducing the taper lock and the file has more cross-sectional space for better cutting and loading debris [37] . Apical preparation was completed with an X4 file as a master apical file, which is equivalent to size #40 ISO, to achieve proper preparation because the surface area of the canal left untouched was 35%-50% with large apical preparations (minimum ISO #40) and preparations less than file #40, which leave much more unprepared dentin [38] .…”

Section: Discussionmentioning

confidence: 99%

Effect of glycolic acid as single irrigant versus sodium hypochlorite and EDTA on enterococcus faecalis count and smear layer removal in single-rooted teeth (an in vitro study)

El-desoki,

Sadek,

Morsy

2023

Int. J. Appl. Dent. Sci.

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The study aimed to compare 10% Glycolic acid as a single irrigant versus 2.5% sodium hypochlorite followed by 17% Ethylenediaminetetraacetic acid (EDTA) in terms of E. faecalis count reduction and smear layer removal in single-rooted teeth. Methodology: Thirty human extracted mandibular premolars were prepared and inoculated with E. faecalis for one week to evaluate E. faecalis count reduction. Teeth were randomly assigned to two groups (n = 15) according to the irrigation protocol used. Group I: intervention (10% Glycolic acid) and Group II: Control group (Irrigation using 2.5% NaOCl followed by 17% EDTA). After 24 hours of incubation, bacterial count reduction using colony forming units CFUs/ml was determined. For evaluating the ability of irrigants to remove the smear layer, another twenty-two mandibular premolars were chosen and randomized into two groups (n = 11). During "chemo-mechanical" preparations, the root canals were irrigated with different irrigation protocols according to each group. Then, the roots were split longitudinally in the bucco-lingual direction into two halves. A smear layer assessment was conducted on the "coronal, middle, and apical thirds" of the root canal using an Environmental Scanning-Electron Microscope (ESEM) at 1000x magnification. Results: Regarding E. Faecalis count reduction, there was "no significant" difference between the two groups (p = 0.14). Regarding the ability to remove the "smear layer", there was no significant difference between the two groups at coronal, middle and apical. While comparing smear layer scores within the same group, the "apical third" showed a significantly higher smear layer score in the two groups. Conclusion: Glycolic acid can be used as a single irrigant owing to its antibacterial efficacy and the ability to remove the smear layer.

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Section: Discussionmentioning

confidence: 99%

Effect of glycolic acid as single irrigant versus sodium hypochlorite and EDTA on enterococcus faecalis count and smear layer removal in single-rooted teeth (an in vitro study)

El-desoki,

Sadek,

Morsy

2023

Int. J. Appl. Dent. Sci.

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Evaluation of stress distribution in nickel-titanium rotary instruments with different geometrical designs subjected to bending and torsional load: a finite element study

Galal

Hamdy

2020

Bull Natl Res Cent

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Introduction Geometrical designs of nickel-titanium (NiTi) rotary instruments have a considerable influence on their mechanical performance, and thereby have the tendency to fracture. Aim To evaluate the effect of cross-sectional geometry, pitch, taper, and off-center cross-section on the stress distribution in NiTi instruments under bending and torsion conditions using finite element analysis (FEA). Materials and methods Eleven theoretical three-dimensional finite element (FE) models of rotary instruments were constructed and divided according to the geometric design tested into; group 1 (cross-section geometry): four FE models with four different cross-section designs (triangle, convex triangular, parallelogram, and rectangle). Group 2 (pitch): three FE models with different pitches (5, 10, and 15 threads). Group 3 (taper): two FEA models with two different tapers (0.04 and 0.06). Group 4 (centering): two FEA models (off-centered and centered cross section). The behavior of the instrument under bending and torsional conditions was analyzed mathematically in SolidWorks software package. Results The pattern of stress distribution was varied by altering cross-sectional geometry, pitch, taper, and off-center cross section. Conclusion No single geometrical design could be beneficial for all stress conditions. To decrease the stress accumulation during bending of rotary files in curved root canals, the rotary NiTi instruments should be designed with rectangle cross-section configuration, low pitch, reduced taper, and with centered cross section. This design improved the flexibility of rotary NiTi instruments. However, to improve the torsional resistance during root canal preparation of narrow canals, the file should be designed with parallelogram cross-sectional configuration, low pitch, increased taper, and eccentric cross-section design.

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Shaping Ability of HyFlex EDM and ProTaper Next Rotary Instruments in Curved Root Canals: A Micro-CT Study

Turkistani

Gomaa

Shafei

et al. 2019

The Journal of Contemporary Dental Practice

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Shaping ability of single versus multi file rotary Ni-Ti systems in curved root canals

Cited by 3 publications

References 3 publications

Effect of glycolic acid as single irrigant versus sodium hypochlorite and EDTA on enterococcus faecalis count and smear layer removal in single-rooted teeth (an in vitro study)

Effect of glycolic acid as single irrigant versus sodium hypochlorite and EDTA on enterococcus faecalis count and smear layer removal in single-rooted teeth (an in vitro study)

Evaluation of stress distribution in nickel-titanium rotary instruments with different geometrical designs subjected to bending and torsional load: a finite element study

Shaping Ability of HyFlex EDM and ProTaper Next Rotary Instruments in Curved Root Canals: A Micro-CT Study

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