Determining shapes and dimensions of dental arches for the
               use of straight-wire arches in lingual technique

Kairalla, Silvana Allegrini; Scuzzo, Giuseppe; Triviño, Tarcila; Velasco, Leandro; Lombardo, Luca; Paranhos, Luiz Renato

doi:10.1590/2176-9451.19.5.116-122.oar

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Articles • Dental Press J. Orthod. 19 (5) • Sep-Oct 2014 • https://doi.org/10.1590/2176-9451.19.5.116-122.oar copy

Determining shapes and dimensions of dental arches for the use of straight-wire arches in lingual technique

Authorship SCIMAGO INSTITUTIONS RANKINGS

INTRODUCTION:

This study aims to determine the shape and dimension of dental arches from a lingual perspective, and determine shape and size of a straight archwire used for lingual Orthodontics.

METHODS:

The study sample comprised 70 Caucasian Brazilian individuals with normal occlusion and at least four of Andrew's six keys. Maxillary and mandibular dental casts were digitized (3D) and the images were analyzed by Delcam Power SHAPET 2010 software. Landmarks on the lingual surface of teeth were selected and 14 measurements were calculated to determine the shape and size of dental arches.

RESULTS:

Shapiro-Wilk test determined small arch shape by means of 25^th percentile (P25%) - an average percentile for the medium arch; and a large one determined by means of 75^th percentile (P75%). T-test revealed differences between males and females in the size of 12 dental arches.

CONCLUSION:

The straight-wire arch shape used in the lingual straight wire technique is a parabolic-shaped arch, slightly flattened on its anterior portion. Due to similarity among dental arch sizes shown by males and females, a more simplified diagram chart was designed.

Dental arch; Orthodontics; Orthodontic appliance design

	Measurement	Mean ± SD	Mean ± SD	Dif.	P value
	Measurement	M	F	Dif.	P value
Mandible	CI	4.72 ± 0.70	4.60 ± 0.70	-0.12	0.497 ns
	LI	3.37 ± 0.56	3.19 ± 0.49	-0.18	0.152 ns
	C	22.74 ± 1.16	22.17 ± 1.28	-0.58	0.060 ns
	PM1	27.51 ± 1.68	26.54 ± 1.60	-0.97	0.018 *
	PM2	31.28 ± 1.65	29.96 ± 2.04	-1.32	0.006 *
	M1	34.30 ± 1.75	33.11 ± 2.21	-1.19	0.020 *
	M2	40.83 ± 1.79	39.14 ± 2.26	-1.69	0.001 *
Maxilla	CI	7.56 ± 0.85	7.37 ± 0.96	-0.19	0.390 ns
	LI	5.23 ± 1.06	5.00 ± 0.61	-0.23	0.264 ns
	C	29.28 ± 1.42	27.99 ± 1.54	-1.30	0.001 *
	PM1	30.27 ± 1.76	28.87 ± 1.71	-1.40	0.001 *
	PM2	35.58 ± 1.62	33.94 ± 2.17	-1.64	0.001 *
	M1	38.67 ± 1.79	36.47 ± 2.34	-2.20	<0.001*
	M2	43.64 ± 2.40	41.35 ± 2.69	-2.29	0.001 *

Measurement		Mean ± SD	Median	Minimum	Maximum	P25%	P75%
Mandible	CI	4.7 ± 0.7	4.7	3.5	6.2	4.2	5.2
	LI	3.4 ± 0.6	3.3	2.3	4.5	3.0	3.8
	C	22.7 ± 1.2	22.7	19.7	25.0	22.1	23.7
	PM1	27.5 ± 1.7	27.4	24.7	31.2	26.2	28.4
	PM2	31.3 ± 1.7	31.2	27.8	34.6	30.0	32.8
	M1	34.3 ± 1.8	34.2	31.3	37.9	32.7	35.8
	M2	40.8 ± 1.8	41.3	36.5	43.4	39.2	42.2
Maxilla	CI	7.6 ± 0.8	7.6	5.6	9.1	7.1	8.1
	LI	5.2 ± 1.1	5.1	3.9	9.3	4.5	5.7
	C	29.3 ± 1.4	29.2	26.2	32.0	28.5	30.4
	PM1	30.3 ± 1.8	30.2	27.0	35.1	29.2	31.2
	PM2	35.6 ± 1.6	35.7	32.7	39.5	34.3	36.7
	M1	38.7 ± 1.8	38.3	35.5	42.6	37.4	40.0
	M2	43.6 ± 2.4	43.4	37.0	48.0	42.2	45.2

Measurement		Mean ± SD	Median	Minimum	Maximum	P25%	P75%
Mandible	CI	4.6 ± 0.7	4.5	3.2	6.4	4.1	4.9
	LI	3.2 ± 0.5	3.1	2.2	4.3	2.9	3.6
	C	22.2 ± 1.3	22.0	19.9	25.0	21.2	23.0
	PM1	26.5 ± 1.6	26.4	22.9	29.3	25.4	27.6
	PM2	30.0 ± 2.0	29.6	24.9	34.0	28.8	31.7
	M1	33.1 ± 2.2	33.0	28.8	37.4	31.9	34.7
	M2	39.1 ± 2.3	38.8	35.3	44.6	37.6	40.5
Maxilla	CI	6.2 ± 0.8	6.1	4.8	8.3	5.6	6.7
	LI	6.2 ± 0.7	6.1	4.9	7.9	5.6	6.6
	C	28.0 ± 1.5	28.1	24.9	30.8	27.1	29.1
	PM1	28.9 ± 1.7	28.6	25.7	32.4	27.6	29.9
	PM2	33.9 ± 2.2	33.7	30.1	39.4	32.4	35.5
	M1	36.5 ± 2.3	36.0	33.1	42.4	34.5	38.2
	M2	41.4 ± 2.7	41.9	36.5	49.8	39.1	43.1

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