Comparison of screw-in effect of three NiTi file systems used by undergraduates

Oh, Seung-Hei; Park, Jeong-Kil; Hur, Bock; Kim, Hyeon‐Cheol

doi:10.5395/jkacd.2006.31.6.477

Cited by 5 publications

(4 citation statements)

References 22 publications

(34 reference statements)

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“…Existence of flat radial lands may be related to reducing the screw-in effect. This finding is consistent with Oh et al 19) They states that active file system with variable pitch and helical angle had more screw-in effect than passive file system. It seems that radial lands play more important role in reducing screw-in effect.…”

Section: ⅳ Discussionsupporting

confidence: 83%

Comparison of screw-in effect for several nickel-titanium rotary instruments in simulated resin root canal

Jin

Kim

et al. 2010

J Korean Acad Conserv Dent

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Section: ⅳ Discussionsupporting

confidence: 83%

Comparison of screw-in effect for several nickel-titanium rotary instruments in simulated resin root canal

Jin

Kim

et al. 2010

J Korean Acad Conserv Dent

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“…The HERO shaper has triple-helix cross section, constant taper, positive rake angle, noncutting tip,[6] no radial land, variable flute helical angle or increasing helical angle from tip to shank, variable flute pitch, and works at a speed of 300–600 rpm. [1314] Positive rake angle cuts dentine effectively. [151617] The long pitch prevents the screwing in phenomenon, increases the cutting action, and facilitates the excision and evacuation of dentine chips.…”

Section: Discussionmentioning

confidence: 99%

A comparative evaluation of intracanal calcium hydroxide removal with hand file, rotary file, and passive ultrasonic irrigation: An in vitro study

et al. 2019

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Aim: The aim of this study was to compare the effectiveness of hand file (K-file), rotary file (HERO shaper), and passive ultrasonic irrigation (PUI; U-file) in removing Ca(OH) 2 from the root canal. Materials and Methods: Thirty single-rooted teeth were collected and decoronated to standardize the length to 14 mm. Cleaning and shaping were conducted using HERO shaper rotary files (up to no. 25, 4% taper). Ca(OH) 2 powder was mixed with normal saline and filled into the canals using lentulo spiral and the orifice was sealed with zinc oxide eugenol. After 7 days of incubation, samples were divided into three groups of 10 samples each: Group I (hand files)—no. 20 K-file; Group II (rotary files)—no. 25, 4% HERO shaper; Group III (PUI)—no. 20 U-file. Ca(OH) 2 paste was removed using 2 mL of 3% sodium hypochlorite solution followed by 1-minute activation of the respective file system. All the samples were finally irrigated with 17% ethylenediaminetetraacetic acid and flushed with distilled water. Results: Ultrasonic group was more effective in removing Ca(OH) 2 followed by HERO shaper and hand file. Conclusion: It was concluded that PUI had the highest ability to remove Ca(OH) 2 from the root canal walls.

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“…10 This tendency is particularly accentuated especially when continuously rotating nickel-titanium instruments are used. 11 Because rotary instruments rotate with electric power, control of the working length is more difficult during rotary instrumentation than during hand instrumentation. 10 For this reason, the screw-in effect during rotary instrumentation may cause overinstrumentation beyond the apical foramen.…”

Section: Introductionmentioning

confidence: 99%

Influence of taper on the screw-in effect of nickel-titanium rotary files in simulated resin root canal

Sung

Kim

2010

J Korean Acad Conserv Dent

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Objectives:The introduction of nickel-titanium alloy endodontic instruments has greatly simplified shaping the root canal systems. However, these new instruments have several unexpected disadvantages. One of these is tendency to screw into the canal. In this study, the influence of taper on the screw-in effect of the Ni-Ti rotary instrument were evaluated. Materials and Methods: A total of 20 simulated root canals with an S-shaped curvature in clear resin blocks were divided into two groups. ProFile .02, .04, .06 (Dentsply-Maillefer) and GT rotary files .08, .10, .12 (Dentsply) were used in Profile group, and K3 .04, .06, .08, .10, and .12 (SybronEndo, Glendora) were used in K3 group. Files were used with a single pecking motion at a constant speed of 300 rpm. A special device was made to measure the force of screw-in effect. A dynamometer of the device recorded the screwin force during simulated canal preparation and the recorded data was stored in computer with designed software. The data were subjected to one-way ANOVA and Tukey's multiple range test for post-hoc test. p value of less than 0.05 was regarded significant. Results: The more tapered instruments generated more screw-in forces in Profile group (p < 0.05). In K3 group, 0.08, 0.10. and 0.12 tapered instruments showed more screw-in force than 0.04 tapered one, and 0.08 and 0.12 tapered instruments showed more screw-in force than 0.06 tapered one (p < 0.05). Conclusions: The more tapered instruments seems to produce more screw-in force. To avoid this screw-in force during instrumentation, more attention may be needed when using more tapered instruments. [J Kor Acad Cons Dent 2010;35(5):380-386.]

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Comparison of screw-in effect of three NiTi file systems used by undergraduates

Cited by 5 publications

References 22 publications

Comparison of screw-in effect for several nickel-titanium rotary instruments in simulated resin root canal

Comparison of screw-in effect for several nickel-titanium rotary instruments in simulated resin root canal

A comparative evaluation of intracanal calcium hydroxide removal with hand file, rotary file, and passive ultrasonic irrigation: An in vitro study

Influence of taper on the screw-in effect of nickel-titanium rotary files in simulated resin root canal

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