Publié en ligne: 30 juil. 2021
Pages: 48 - 56
Reçu: 01 déc. 2015
Accepté: 01 janv. 2017
DOI: https://doi.org/10.21307/aoj-2020-084
© 2017 María Cadenas-Llano et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.
Background/objectives/aims
The present study considered the effect of orthodontic friction in an evaluation of the relationship of craniofacial pattern and surface micro-roughness of fixed appliances as determinants of treatment response and time.
Methods
Brachyfacial (BF; N = 17) and dolichofacial (DF; N = 18) patients treated by canine retraction using sliding mechanics, were identified. One archwire and one bracket per patient (those of the hemi-arch showing the fastest space closure of 4 mm) were subjected to confocal scanning microscopic analysis. Total treatment duration, sliding time, tooth movement rate, topographical surface average roughness (Ra), root mean square roughness (RMS), surface-kurtosis (SK), and surface-skewness (SS) were recorded and compared between groups using the Mann-Whitney U test. Correlations between final micro-roughness and treatment time were investigated using Pearson’s coefficient within each craniofacial type (a = 0.05). The post-treatment appliance surfaces were examined by SEM.
Results
BF patients recorded a significantly higher sliding time, lowest retraction rates, and greatest final Ra and RMS (
Conclusions
Compared with DF subjects, BF patients registered higher friction between the orthodontic components, required longer sliding time, and showed lower retraction rates.