Relationship between friction force and orthodontic force
               at the leveling stage using a coated wire

MURAYAMA, Masaki; NAMURA, Yasuhiro; TAMURA, Takahiko; IWAI, Hiroaki; SHIMIZU, Noriyoshi

doi:10.1590/1679-775720130325

Acessibilidade / Reportar erro

Brasil

Journal of Applied Oral Science

Español English

Brasil

Español English

sumário « anterior atual seguinte »

Sumário

ORIGINAL ARTICLES • J. Appl. Oral. Sci. 21 (6) • Nov-Dec 2013 • https://doi.org/10.1590/1679-775720130325 copy

Relationship between friction force and orthodontic force at the leveling stage using a coated wire

Authorship SCIMAGO INSTITUTIONS RANKINGS

The relationship between orthodontic force and friction produced from an archwire and brackets affects the sliding of the wire in the leveling stage.

Objective:

The purpose of this study was to evaluate the relationship between force and friction in a small esthetic nickel-titanium (Ni-Ti) wire.

Material and Methods:

Five esthetic wires (three coated and two plated) and two small, plain Ni-Ti wires (0.012 and 0.014 inches) were used. We performed a three-point bending test according to ISO 15841 and the drawing test with a dental arch model designed with upper linguoversion of the lateral incisor in the arch (displacements of 0.5, 1.0, 2.0 and 3.0 mm), and evaluated the relationship between them.

Results:

Unloading bending forces of all wires at displacements of less than 1.0 mm were larger than friction forces, but all friction forces at displacements exceeding 2.0 mm were larger than unloading bending forces. The arch likely expands when displacement from the proximal brackets exceeds 1.0 mm. The friction force of a martensite 0.014-inch Ni-Ti wire was significantly greater than those of the other esthetic and austenitic wires.

Conclusions:

A wire with the smallest possible friction force should be used in cases with more than 1.0 mm displacement.

Orthodontics; Friction; Esthetic; Materials

Abb.	Products	Manufactures	Surface treatment	Wire sizes
A-1	Aesthetic nickel titanium wire	TP Orthodontics	Xylan-coated (only labial surface)	0.012" and 0.014"
A-2	Nickel titanium wire cosmetic	Forestadent	Polytetrafluoroethylene-coated	0.012" (coated 0.014")
	arches coated			0.014" (coated 0.016")
A-3	Tynilloy wire lemon gold	Dentsply-sankin	Gold-plated	0.012" and 0.014"
A-4	Tynilloy wire peach gold	Dentsply-sankin	Gold-plated	0.012" and 0.014"
A-5	Tynilloy wire white	Dentsply-sankin	Fluorpolymer-coated	0.012" (coated 0.013") 0.014" (coated 0.015")
P-1	Reflex wire nickel titanium	TP Orthodontics	N/A	0.012" and 0.014"
P-2	Nitinol classic	3M Unitek	N/A	0.012" and 0.014"

	0.012 inch						0.014 inch
	Unloading bending force (cN)			Friction force (cN)			Unloading bending force (cN)			Friction force (cN)
	Mean	S.D.	Sig.	Mean	S.D.	Sig.	Mean	S.D.	Sig.	Mean	S.D.	Sig.
A-1	49.2	10.3	a, b, c, d	20.9	2	a	78.7	4.3	A	29.4	4.4	A
A-2	43	12.4	a, b, c, d	23	7.1	a	65.9	18.8	A, C	25.9	6.4	A
A-3	32.4	1.6	a	9.7	2.4	b	66.3	1.1	B, C, D	18.8	3.1	A, C
A-4	48.8	2.7	b	9.1	2.9	b	79.5	3	A	20.9	6.9	A, D
A-5	27.8	1.3	c	7	0.9	b	60.7	2.7	B, C, E	11.4	1.5	B, C, D
P-1	54.1	7.5	b, e	22.7	6.6	a	85.6	13.4	A, D, E	24.6	6.3	A
P-2	39.7	2.8	d, e	21.9	2.4	a	67.6	7.3	A, D, E	50.5	8.3	B

	0.012 inch						0.014 inch
	Unloading bending force (cN)			Friction force (cN)			Unloading bending force (cN)			Friction force (cN)
	Mean	S.D.	Sig.	Mean	S.D.	Sig.	Mean	S.D.	Sig.	Mean	S.D.	Sig.
A-1	71.1	7.6	a, e, f	29.5	11.1	a, b	88.9	5.7	A	53.7	26.9	A, B, D
A-2	54.2	3.6	b, c	38.6	8.8	a	86.6	5	A, C	72.5	11.9	A, D
A-3	54.8	1.3	a, c	11.2	3.7	b, c	78.3	1.7	B, C	31.4	7.6	B, C
A-4	58.5	1.8	a, c	21.1	11	a, c, d	95.4	1.1	A, E	28	8.8	A, B
A-5	42.7	0.9	d	13.5	0.9	b, d	78.7	2.5	B, C	19.7	6.4	A, B
P-1	78.8	1.5	e	31.1	5.6	a	100.9	2	D, E	49.4	20.4	A, C
P-2	74.2	1.9	f	43.6	13.5	a	123.2	4.6	F	93.6	13.6	D

	0.012 inch						0.014 inch
	Unloading bending force (cN)			Friction force (cN)			Unloading bending force (cN)			Friction force (cN)
	Mean	S.D.	Sig.	Mean	S.D.	Sig.	Mean	S.D.	Sig.	Mean	S.D.	Sig.
A-1	71.4	4.8	a, e, f	166	26.3	a, d	99	6.7	A, B, C	278.6	72.7	A, B
A-2	58.2	1.8	b, c	161.6	28.3	a, d	93.1	5.2	A	254.2	68	A, B
A-3	61.8	2	a, c	96.1	20.2	b, c	93.5	1.9	A	250.2	16.7	A, B
A-4	67.6	1.2	e	122.9	23.7	a, c	106.6	1.4	B	218.1	27.8	A, B
A-5	50.3	3.1	d	152.1	41.2	a, c, e	90.8	3.6	A	285	35.9	A
P-1	79.3	1.3	f	148.5	43.6	a, c, f	105	2.4	B	206	28.9	B
P-2	96.8	2.9	^g	169.7	19.9	d, e, f	165.4	4.4	C	444.9	19.1	C

	0.012 inch						0.014 inch
	Unloading bending force (cN)			Friction force (cN)			Unloading bending force (cN)			Friction force (cN)
	Mean	S.D.	Sig.	Mean	S.D.	Sig.	Mean	S.D.	Sig.	Mean	S.D.	Sig.
A-1	69.4	0.8	a	259.4	0.8	a, b	112.3	6.1	A	599.6	125	A
A-2	75.4	6.1	a, c	291.9	108.6	a, b	118.4	10.3	A	533.2	101.2	A
A-3	65.1	5.6	a, d	164.4	47.5	a	104.8	9.2	A	510.8	37.8	A
A-4	70.6	2	a	256.5	21	b, c	119.1	3.6	A	436	63	A
A-5	53.5	3.1	b, d	276	70.8	a, c, d	108.2	8.8	A	548.1	61.7	A
P-1	82.5	2.6	c, e	282.2	29.2	b, d	119.9	6.6	A	432.8	47.1	A
P-2	90	3.2	f	205.2	23.5	a	164.5	3.5	B	950.7	101.6	B

Faculdade De Odontologia De Bauru - USP Serviço de Biblioteca e Documentação FOB-USP, Al. Dr. Octávio Pinheiro Brisolla 9-75, 17012-901 Bauru SP Brasil, Tel.: +55 14 32358373 - Bauru - SP - Brazil
E-mail: jaos@usp.br

Acompanhe os números deste periódico no seu leitor de RSS

[1] Corresponding address: Yasuhiro Namura - 1-8-13 Kandasurugadai - Chiyoda-ku - Tokyo - 101-8310 - Japan - Phone: +81-3-3219-8105 - Fax. +81-3-3219-8312 e-mail: namura.yasuhiro@nihon-u.ac.jp