Comparation of three methods for measuring the Edge Bevel Radius of rectangular orthodontic wires: An in-vitro study.
Int Orthod
; 18(3): 509-518, 2020 Sep.
Article
em En
| MEDLINE
| ID: mdl-32327346
ABSTRACT
OBJECTIVE:
To establish a simplified method for measuring the edge bevel radius of 0.019×0.025-in steel rectangular orthodontic wires, achievable in the clinical environment, and to compare it with the photographic method. MATERIALS ANDMETHODS:
Aided by the AutoCAD™ 2016 software, the theoretical mathematical relationship was determined between the edge rounding radius and cross-sectional dimensions (height, width, diagonals), through rectangle drawings that represent cross-sections. Two hundred segments (n=20) were obtained from the posterior portions of 100 archwires from 10 brands (Dentaurum™; American-Orthodontics™; GAC™; 3M-Unitek™; Abzil™; Morelli™; Orthometric™; Aditek™; A-Company™; Orthomundi™). The cross-sectional measures of each segment were obtained with a micrometer and a caliper, and the edge bevel radii of these segments were calculated with the use of a mathematical formula. For the "gold standard", the segments were included longitudinally in a phenolic resin cylinder, cross-sectioned, polished, and photographed in scanning electron microscope (SEM). The images were amplified 770× and the radii were measured with an acetate template. The micrometer and caliper measuring methods were subjected to Bland-Altman analysis and compared with the gold standard (SEM), considering ±10µm as the maximum acceptable difference between methods.RESULTS:
In the micrometre measurement, 95% of the differences from the standard were within the limits of agreement (-7.21 and 5.56µm). For the caliper method, 95% of the differences were between -5.46 and 19.83µm, which exceeded the fixed limit ±10µm.CONCLUSION:
The calculation method with micrometre measurements is equivalent to the photographic method, but there is no such equivalence for the caliper measurements.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Fios Ortodônticos
/
Ortodontia
/
Rádio (Anatomia)
Tipo de estudo:
Observational_studies
/
Prevalence_studies
/
Risk_factors_studies
Limite:
Humans
Idioma:
En
Revista:
Int Orthod
Assunto da revista:
ORTODONTIA
Ano de publicação:
2020
Tipo de documento:
Article
País de afiliação:
Brasil