<abstract xmlns="http://www.w3.org/1999/xhtml"><sec><h3>Background/objectives/aims</h3><p>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.</p></sec><sec><h3>Methods</h3><p>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 (R<sub>a</sub>), 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.</p></sec><sec><h3>Results</h3><p>BF patients recorded a significantly higher sliding time, lowest retraction rates, and greatest final R<sub>a</sub> and RMS (<italic>p</italic> &lt; 0.001). A comparison of total treatment time and final SK and SS values yielded no significant differences. Significant positive correlations between sliding time and final R<sub>a</sub> were identified in both groups.</p></sec><sec><h3>Conclusions</h3><p>Compared with DF subjects, BF patients registered higher friction between the orthodontic components, required longer sliding time, and showed lower retraction rates.</p></sec></abstract>

Background/objectives/aimsThe 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.MethodsBrachyfacial (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.ResultsBF patients recorded a significantly higher sliding time, lowest retraction rates, and greatest final Ra and RMS (p < 0.001). A comparison of total treatment time and final SK and SS values yielded no significant differences. Significant positive correlations between sliding time and final Ra were identified in both groups.ConclusionsCompared with DF subjects, BF patients registered higher friction between the orthodontic components, required longer sliding time, and showed lower retraction rates.

Influence of facial types on sliding mechanics

Australasian Orthodontic Journal

This work is licensed under the Creative Commons Attribution 4.0 International License.

{"article-title":"Influence of facial types on sliding mechanics"}

Background/objectives/aimsThe present study considered the effect of orthodontic friction in an evaluation of the relationship of craniofacial pattern and...

Influence of facial types on sliding mechanics

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.