Veli A
King's College London.
Eur J Prosthodont Restor Dent. 2019 Nov 28;27(4):172-181. doi: 10.1922/EJPRD_01914Veli13.
The colour stability of the silicone is essential for the longevity of facial prostheses. This in vitro study investigates the colour degradation of two different skin shade silicones moulded in Type II and Type III dental stone.
METHODS & MATERIALS: Two different types of dental stone were used to fabricate 168 silicone samples (n=42 for each group) using M511 maxillofacial silicone, which was coloured with Spectromatch Procolourants. The polymerisation was carried out at 85°C 1.5 hours. A spectrophotometer was used to record the colour differences (ΔΕ) of each group before and after polymerisation. The CIELab* formula was used to obtain the measurements and a one-way ANOVA was carried out for the statistical analysis of the data.
There is a statistically significant colour difference (ΔΕ) for all groups. For the Afro-Caribbean skin tone, Type III dental stone demonstrated the greatest colour change (ΔΕ = 4.36), whereas, for the Caucasian skin tone, it was the Type II dental stone (ΔΕ = 2.21).
This study showed that regardless of the investing material, the colour of the silicone lightens after polymerisation. Both types of dental stone resulted in visible colour changes, with a ΔΕ ranging from 1.64 - 4.36.
硅酮的颜色稳定性对面部假体的使用寿命至关重要。本体外研究调查了用II型和III型牙科石膏模制的两种不同肤色硅酮的颜色降解情况。
使用两种不同类型的牙科石膏，用M511颌面硅酮制作168个硅酮样本（每组n = 42），该硅酮用Spectromatch Procolourants着色。聚合在85°C下进行1.5小时。使用分光光度计记录每组聚合前后的颜色差异（ΔΕ）。使用CIELab*公式进行测量，并对数据进行单向方差分析以进行统计分析。
所有组均存在统计学上显著的颜色差异（ΔΕ）。对于非裔加勒比人肤色，III型牙科石膏显示出最大的颜色变化（ΔΕ = 4.36），而对于白种人肤色，II型牙科石膏的颜色变化最大（ΔΕ = 2.21）。
本研究表明，无论包埋材料如何，硅酮在聚合后颜色都会变浅。两种类型的牙科石膏都导致了可见的颜色变化，ΔΕ范围为1.64 - 4.36。
