The influence of cigarette smoke on colour stability and friction property of aesthetic orthodontic wires—In vitro study - 20/08/20
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Summary |
Objective |
To evaluate the colour stability and friction property of aesthetic orthodontic wires when exposed to cigarette smoke.
Materials and methods |
Forty-eight samples of aesthetic orthodontic wires (0.019″×0.025″) were allocated to three experimental groups according to their brand (n=8): GAD (Aditek™); GTP (TP Orthodontics™); GRM (Rocky Mountain™) and their respective control groups (GC) (n=8). Samples were exposed to 2 cycles of smoke in a hermetic chamber while GCs were stored in artificial saliva at 37°C. Colour analysis (CIEL*a*b* colour space and NBS units) was performed on 5mm wire segments with the Vita Easyshade Compact spectrophotometer. The friction analysis was performed in a universal test machine, in segments of 5cm wires tied to ceramic brackets with maximum values recorded in N/cm. The comparison between groups was performed with the ANOVA/Tukey test (a=0.05) and the effect of the time evaluated with ANOVA-MR with Bonferroni correction (a=0.016).
Results |
GTP and GRM did not show significant colour and friction property variations and did not differ from GC during the study (P>0.05). However, GAD was significantly sensitive to colour changes (T1-T0-L*: −4.09±1.06; a*: 2.25±0.39; b*: 1.70±0, (T2-T0-L* 0.66±0.92; a*: 2.76±0.35) and friction (T2-T0: 2.07±1.00N/cm) (P<0.016).
Conclusion |
Exposure to cigarette smoke may alter the mechanical and optical properties of aesthetic orthodontic wires.
Le texte complet de cet article est disponible en PDF.Keywords : Dental materials, Dental aesthetic, Orthodontic appliance, Colour analysis
Plan
Vol 18 - N° 3
P. 555-560 - septembre 2020 Retour au numéro
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