The authors wish to inform the readers of an important error they made regarding the text from abstracts 217 which was originally submitted (e-106). The text from this abstract contained the wrong data and this is therefore amended below:
Purpose: The aim of this study was to evaluate the clinical color change of resin composite Class IV restorations and compare with the remnant tooth color change, according to the period of evaluation.
Methods and materials: Nine patients were selected with unsatisfied Class IV restoration in one or both upper central incisors. Thirteen teeth were restored with a nanohybrid composite resin (IPS Empress Direct – Ivoclar Vivadent, Schaan, Liechtenstein). Baseline color was measured immediately after the completion of restoration according to the CIE L*a*b* system using a reflection spectrophotometer (Easyshade – Vita Zahnfabrik, Bad Sackinger, Germany). The measurement was performed on the restoration and on its remnant tooth structure. Additionally, the color was measured according to the evaluation period: 48 h before and after the polishing procedure, 7, 14 and 28 days after the restoration procedure. The color change (Δ E ) of each tooth and restoration at each evaluation period was obtained from the values of L*a*b*. Data were submitted to Mann–Whitney test ( a = 5%).
Results: The color change was significantly different between tooth and restoration for the following periods of evaluation: 48 h before and after the polishing procedure and 7 days ( p < 0.05). For the periods of 14 days (tooth 4.62 ± 1.36/restoration 3.98 ± 1.46) and 28 days (tooth 3.84 ± 1.12/restoration 3.07 ± 1.13) the Δ E values were statistically similar between tooth and restoration ( p > 0.05).
Conclusion: It was concluded that there was no difference on color change between the remnant tooth and the resin composite restoration, after the period of 14 and 28 days.
The authors would like to apologise for any inconvenience caused.