Evaluation of friction between ceramic brackets and orthodontic wires of four alloys

Angolkar, Padmaraj V.; Kapila, Sunil; Duncanson, Manville G.; Nanda, Ram S.

doi:10.1016/0889-5406(90)70015-5

Cited by 165 publications

(121 citation statements)

References 9 publications

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“…The results indicated that self ligating brackets required less force to produce tooth movement than conventionally tied Siamese brackets. Generally, friction appears to increase as archwire diameter increases [14,15] and the results of this investigation supported this view. With all three bracket types, the 0.019 x 0.025 inch stainless steel wire produced the highest friction.…”

Section: Resultssupporting

confidence: 79%

“…As the tooth moves, the second component of friction, which is termed as dynamic friction, occurs when the archwire moves in the direction of the applied force, as it is guided through the molar and premolar bracket slots. The cause of frictional resistance between archwires and brackets is multifactorial and it varies with archwire size and material [13][14][15], mode of ligation [12,16,17], bracket width [18,19] and wire to bracket angulation [7].…”

Section: Resultsmentioning

confidence: 99%

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“Evaluation of Friction in Orthodontics Using Various Brackets and Archwire Combinations-An in Vitro Study”

Singh¹

2014

JCDR

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AIM:The aim of this study was to compare frictional resistance which was produced between conventional brackets (0.022 slot Otho-Organiser) and self ligating brackets (active Forestadent and passive Damon III) by using various arch wire combinations (0.016 Niti, 0.018 Niti, 0.017 x 0.025 SS and 0.019 x 0.025 SS). Materials and Methods:An experimental model which consisted of 5 aligned stainless steel 0.022-in brackets was used to assess frictional forces which were produced by SLBs (self ligating brackets) and CELs (conventional elastomeric ligatures) with use of 0.016 nickel titanium, 0.018 nickel titanium, 0.017 x 0.025"stainless steel and 0.019 X 0.025"stainless steel wires.Statistical Analysis: One way ANOVA test was used to study the effect of the bracket type, wire alloy and section on frictional resistance test .Results: Conventional brackets produced highest levels of friction for all bracket/archwire combinations. Both Damon III and Forestadent brackets were found to produce significantly lower levels of friction when they were compared with elastomerically tied conventional brackets. Conclusion:SLBs are valid alternatives for low friction during sliding mechanics.

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Section: Resultssupporting

confidence: 79%

Section: Resultsmentioning

confidence: 99%

“Evaluation of Friction in Orthodontics Using Various Brackets and Archwire Combinations-An in Vitro Study”

Singh¹

2014

JCDR

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“…Other works show similar frictional force between mono-and polycrystalline, or less friction in the polycrystalline than that in the monocristalline, also less friction in the monocristalline. 18,24,25,30 In our study, the highest frictional values were observed in the monocrystalline brackets. Although they have smoother surfaces than the polycrystalline brackets, studies suggest that higher frictional values could be produced by sharp and hard edges created at the intersection of the base and walls of the slot with the external surface of the bracket.…”

Section: Discussionmentioning

confidence: 59%

“…21,23,24 Some authors did not find any relation between roughness of the wire and the amount of friction created; 14 however, other studies show different results. 1,25,26 The composition of the slot is perhaps the most important factor, since the coefficient of friction, which is specific for each pair of materials, depends on it. 6 The present study shows results similar to those of other investigators, who point to SS brackets as the ones producing the lowest frictional forces.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of frictional forces between ceramic brackets and archwires of different alloys compared with metal brackets

et al. 2010

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The aim of this study was to evaluate, in vitro, frictional forces produced by ceramic brackets and arch wires of different alloys. Frictional tests were performed on three ceramic brackets: monocrystalline (Inspire ICE), polycrystalline (InVu), polycrystalline with metal slot (Clarity), and one stainless steel bracket (Dyna-Lock). Thirty brackets of each were tested, all with .022" slots, in combination with stainless steel and nickel-titanium wires .019" × .025", at 0° and 10° angulation, in artificial saliva. Arch wires were pulled through the slots at a crosshead speed of 10 mm/min. There were statistically significant differences between the groups of brackets and wires studied (p < .05). The polycrystalline brackets with metal slots had values similar to those of conventional polycrystalline brackets, and the monocrystalline brackets had the highest frictional forces. The nickel-titanium wires produced the lowest friction. The addition of metal slots in the polycrystalline brackets did not significantly decrease frictional values. Nickel-titanium wires produced lower friction than those of stainless steel.

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“…2 The angle at which the clearance between the archwire and the bracket first disappears is defined as the critical contact angle ( c ). 3 If the angulation between the archwire and the bracket slot is less than the critical contact angle in the passive configuration, only classic friction is important, because binding 4,5 and notching 6 are nonexistent (Fig 1, A). Several investigators have studied the causes and effects of resistance to sliding in the passive configuration as a function of wire alloy, bracket material, surface modification and roughness, and wet and dry states.…”

Section: S Liding Mechanics Are Commonly Used In Ortho-mentioning

confidence: 99%

Three-dimensional relationship between the critical contact angle and the torque angle

Kang¹,

Baek²,

Mah³

et al. 2003

American Journal of Orthodontics and Dentofacial Orthopedics

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The purpose of this study was to analyze the relationship between the critical contact angle and the torque angle in an orthodontic bracket and archwire assembly in 3 dimensions. Three-dimensional mathematical models were created with geometric bracket-archwire parameters that included 2 slot sizes, 3 bracket widths, and 3 to 4 wire sizes. From this, 3-dimensional mathematical equations (3DMEs) for the critical contact angle and the maximum torque that result in critical contact angles of 0 were derived and calculated. To evaluate the effects of archwire-bracket parameters on critical contact angles, analysis of variance (ANOVA) was performed at the significance level of P Յ .05. For all bracket-archwire combinations, the critical contact angle decreased as bracket width, torque angle, and wire size increased. Therefore, all bracket-archwire parameters except slot height had an effect on the critical contact angle. Results of the critical contact angle produced from our 3DMEs were the same as those produced by 3D computer-aided design (SolidWorks Corp, Concord, Mass), thus confirming the validity of our derived equations. In addition, the effect of a beveled edge was investigated in some archwires. Furthermore, torsional play angles were calculated and found to be similar to those in previous reports. The results of this study provide theoretic and experimental bases for clinical orthodontic practice and indicate that torque angles should be included in the evaluation of the critical contact angle. (Am J Orthod Dentofacial Orthop 2003;123:64-73)

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Evaluation of friction between ceramic brackets and orthodontic wires of four alloys

Cited by 165 publications

References 9 publications

“Evaluation of Friction in Orthodontics Using Various Brackets and Archwire Combinations-An in Vitro Study”

“Evaluation of Friction in Orthodontics Using Various Brackets and Archwire Combinations-An in Vitro Study”

Evaluation of frictional forces between ceramic brackets and archwires of different alloys compared with metal brackets

Three-dimensional relationship between the critical contact angle and the torque angle

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