背景:对长期颜色变化的抗性是面部假体弹性体的期望性质。缺乏在老化和炎热潮湿的印度风化条件下颌面有机硅的颜色稳定性的证据。
目的:这项体外研究的目的是评估在人类老化和印度天气条件下,添加遮光剂对颌面有机硅颜色稳定性的影响。
方法:从A-2186中获得总共93个样品盘,铂基,室温硫化,使用Ø30×6-mm不锈钢模具的颌面硅胶弹性体。标本分为3个主要组(n=30),C(控制),T(二氧化钛),和B(硫酸钡),并将每组的1个额外样本(n=1)储存在封闭的盒子中,并进一步细分为室外风化(COut,TOut,BOut),酸性汗液(卡西德,Tascid,B酸),皮脂(CSebum,TSebum,BSebum)(n=10),和视觉比较(CVis,电视,BVis)(n=1)。基线L*,a*,b*值是用分光光度计和视觉感知记录的。标本经受了人体和口腔外老化条件,6个月后再次记录。通过使用方差分析(ANOVA)和使用Tukey事后检验的事后分析对数据进行统计分析。
结果:在C组中,COut的平均颜色变化为3.69±0.49;CACID,3.58±0.68;和CSebum,7.53±0.22(P<.001)。在T组,TOut的平均颜色变化为2.60±0.24;Tascid,2.35±0.13;和TSebum,4.91±0.44(P<.001)。B组,BOut为1.59±0.28,BAcid为1.46±0.28,BSebum为4.03±0.71(P<.001)。含有硫酸钡的样品显示出最大的颜色稳定性。在暴露于皮脂溶液的所有样本中观察到最小的颜色稳定性,并且与室外天气和酸性汗液样本显著不同(P<.001)。在暴露于皮脂溶液的样品中观察到视觉上可感知的颜色变化。
结论:当暴露于室外风化和酸性汗液中时,添加二氧化钛和硫酸钡作为遮光剂会导致临床上可接受的颜色变化,但在皮脂溶液中不会。
BACKGROUND: Resistance to long-term color change is a desirable property for facial prosthetic elastomers. Evidence for the color stability of maxillofacial silicones under aging and hot and humid Indian weathering conditions is lacking.
OBJECTIVE: The purpose of this in vitro
study was to evaluate the effect of adding opacifiers on the color stability of maxillofacial silicone under human aging and Indian weather conditions.
METHODS: A total of 93 specimen disks were obtained from the A-2186, platinum-based, room-temperature vulcanized, maxillofacial silicone elastomer by using a Ø30×6-mm stainless-steel die. The specimens were divided into 3 main groups (n=30), C (control), T (titanium dioxide), and B (barium sulfate), and 1 additional specimen (n=1) from each group was stored in a closed box and further subgrouped as outdoor weathering (COut, TOut, BOut), acidic perspiration (CAcid, TAcid, BAcid), sebum (CSebum, TSebum, BSebum) (n=10), and visual comparison (CVis, TVis, BVis) (n=1). Baseline L∗, a∗, b∗ values were recorded by using a spectrophotometer and visual perception. The specimens were subjected to human and extraoral aging conditions, and the values were recorded again after 6 months. Data were analyzed statistically by using analysis of variance (ANOVA) and post hoc analysis with the Tukey post hoc test.
RESULTS: In group C, the mean color change for COut was 3.69 ±0.49; CAcid, 3.58 ±0.68; and CSebum, 7.53 ±0.22 (P<.001). In group T, the mean color change for TOut was 2.60 ±0.24; TAcid, 2.35 ±0.13; and TSebum, 4.91 ±0.44 (P<.001). In group B, BOut was 1.59 ±0.28, BAcid was 1.46 ±0.28, and BSebum was 4.03 ±0.71 (P<.001). The specimens containing barium sulfate showed the maximum color stability. The least color stability was observed in all specimens exposed to sebum solution and was significantly different (P<.001) from the outdoor weather and acidic perspiration specimens. Visually perceivable color changes were observed in specimens exposed to the sebum solution.
CONCLUSIONS: The addition of titanium dioxide and barium sulfate as opacifiers resulted in clinically acceptable color change when exposed to outdoor weathering and acidic perspiration but not in sebum solution.