Commentary on resistance to fracture by twisting: ANSI/ADA specification No. 28 and No. 58

Bolger, Walton L.; Gough, Robert W.

doi:10.1016/s0099-2399(85)80179-5

Cited by 2 publications

(1 citation statement)

References 8 publications

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“…Changes in the resistance to fracture by twisting were also observed after sterilization. However, a correlation between the torsional moment and angular deflection was not found, which agrees with the results of Bolger & Gough (1985). Some of the sizes of stainless steel files were less resistant to fracture by twisting, according to values obtained when tested for torsional moment and angular deflection.…”

Section: Discussionsupporting

confidence: 80%

The effect of sterilization on bending and torsional properties of K‐files manufactured with different metallic alloys

1998

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The purpose of this study was to assess the effect of dry‐heat or autoclave sterilization on the resistance to fracture in torque and angular deflection and the resistance to bending of K‐type files made of nickel‐titanium (Nitiflex, Naviflex), titanium (Microtitane) or stainless steel (Flexofile, Flex‐R). Ten K‐type files of each sort, from size 25 to 40, were tested, according to ANSI/ADA specification 28 (1988) and ISO specification 3630 (1992). Sterilization with dry heat and autoclave slightly decreased the flexibility of files made of stainless steel and nickel‐titanium for most of the sizes, although the values obtained satisfied ISO specifications. The files made of titanium showed an increased flexibility after sterilization with autoclave (sizes 30 and 35) and dry heat (sizes 30, 35 and 40). Resistance to fracture varied amongst the five groups of files tested as follows: it decreased in some sizes of stainless‐steel instruments, decreased in all sizes of titanium files assessed by the torsional moment, and either increased or decreased in some sizes of nickel‐titanium files. All files tested, however, satisfied relevant standards for angular deflection after being subjected to sterilization with an autoclave or dry heat.

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Section: Discussionsupporting

confidence: 80%

The effect of sterilization on bending and torsional properties of K‐files manufactured with different metallic alloys

1998

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A comparison of bending and torsional properties of K‐files manufactured with different metallic alloys

1996

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The purpose of this study was to compare bending (bending moment) and resistance to fracture by twisting (torsional moment and angular deflection) of triangular cross-section K-files made of either nickel titanium (Nitiflex, Naviflex), titanium (Microtitane) or stainless steel (Flexofile, Flex-R). A total of 200 files were tested, 10 instruments for each type from size 25 to 40, according to ANSI/ADA specification no. 28 and ISO reference no. 3630. Files made of nickel titanium, especially Nitiflex, were the most flexible. Stainless steel instruments presented a higher bending moment than files made of nickel titanium and titanium, particularly Flex-R sizes 35 and 40. With regard to resistance to fracture, measured by angular deflection at the failure point, Flexofile followed by Flex-R were the most resistant to fracture and Nitiflex were the least resistant. Differences in angular deflection among file groups were greater than those for torsional moment. Thus, it seems that angular deflection is a more specific measurement for assessing resistance to fracture by twisting.

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Commentary on resistance to fracture by twisting: ANSI/ADA specification No. 28 and No. 58

Cited by 2 publications

References 8 publications

The effect of sterilization on bending and torsional properties of K‐files manufactured with different metallic alloys

The effect of sterilization on bending and torsional properties of K‐files manufactured with different metallic alloys

A comparison of bending and torsional properties of K‐files manufactured with different metallic alloys

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