An in vivo spectrophotometric evaluation of Vivera® and Essix® clear thermoplastic retainer discolouration
Online veröffentlicht: 20. Juli 2021
Seitenbereich: 3 - 10
Eingereicht: 01. März 2017
Akzeptiert: 01. Aug. 2017
DOI: https://doi.org/10.21307/aoj-2020-053
© 2018 Anastasios A. Zafeiriadis et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.
Aim
To assess the in vivo colour alterations of two different clear thermoplastic retainers.
Methods
Thirty patients were randomly allocated into two Groups (N = 15) following the completion of active orthodontic treatment. Group 1 received Vivera® and Group 2 Essix® C+ thermoplastic retainers. Each patient was provided with two fabricated retainers (one for use and the other to serve as a control). The CIELAB parameters of the patients’ upper central incisors were measured with a SpectroShade™ spectrophotometer immediately after retainer placement (T0) and again after 15 days (T1), one month (T2) and three months (T3). The measurements were also performed on teeth without the retainer in place. ΔE differences were calculated.
Methods
ΔE changes from T0 to Tp T2 or T3 showed no statistically significant differences between Groups 1 and 2 within any combination of measurements or teeth. ΔEļŢ3-Ţ0ļ changes for used retainers were 1.55 times higher than control appliances (
Results
Used retainers exhibited greater colour change than control appliances or teeth-only readings, and increased commensurate with the duration of use. Vivera® and Essix® retainers exhibited similar colour stability. All differences observed were considered clinically acceptable (ΔE < 3.7), although prolonged use could cause clinically significant colour changes.