Introduction: Coated archwires improve aesthetics because of the tooth-coloured appearance. However, colour change of the coated archwires have been reported in vitro. Nonetheless, little is known to what extent this colour change occurs clinically. This second part of the multi-centre, double-blind, randomised controlled trial evaluated the colour change (∆E*) of three coated archwires with their controls and patient perception. Methods: 84 patients who received treatment with upper and lower fixed appliance treatment were invited. Consented patients were randomised to receive one of four treatment interventions using 0.014” superelastic nickel-titanium archwires from (1) Orthocare (2) RMO (3) G&H, and (4) 3M Unitek® uncoated. These archwires were ligated during bonding and collected after 8th week. After removal, the digital images of the archwires were assessed for colour change using Adobe® Photoshop® software, and the CIE L*a*b* system was used to calculate the ΔE* values. Patient perception was measured using oral aesthetic subjective impact scale (OASIS) questionnaire. Results: For colour change and patient perception assessment, 132 archwires from 66 participants who had been treated with aesthetic archwires were collected. Two fractured archwires were excluded. Initial analysis revealed all three aesthetic archwires groups showed significant mean of ∆E* with the highest was found in Orthocare (23.9), and the lowest is G&H (16.8). Post hoc comparison revealed statistically significant mean of ∆E* in Orthocare when compared with other groups (p <0.001). There was no statistically significant difference for patient perception between archwire groups. Conclusion: Preliminary results revealed that significant ∆E* in Orthocare group and patients showed positive perception following clinical use
Craniofacial & ; Biomaterial Sciences Cluster, Advanced Medical & ; Dental Institute, Universiti Sains Malaysia, 13200 Kepala Batas, Penang, Malaysia. 2 School of Dental Sciences, Universiti Sains Malaysia (Health Campus), 16150 Kubang Kerian, Kelantan, Malaysia