Haug S P, Andres C J, Moore B K
Indiana University School of Dentistry, Indianapolis, Ind. 46202, USA.
J Prosthet Dent. 1999 Apr;81(4):418-22. doi: 10.1016/s0022-3913(99)80008-0.
The average clinical life span of a maxillofacial prosthesis is approximately 6 months, at which point it needs to be refabricated, mainly because of degradation of the color and physical properties of the prosthesis.
This first part of a 3-part study evaluated the effect of coloring agents on the physical properties of maxillofacial elastomers.
Five dumbbell-shaped and 5 trouser-shaped specimens were fabricated for each of the combinations of the 3 elastomers (Silastic medical adhesive type A, Silastic 4-4210, and Silicone A-2186) and 6 colorants (dry earth pigments, rayon fiber flocking, artist's oil paints, kaolin, liquid cosmetics, and no-colorants), for a total of 180 specimens. Evaluations of hardness and tear strength were made with the trouser-shaped specimens. Evaluations of the ultimate tensile strength and the percentage elongation were made with the dumbbell-shaped specimens. A within elastomer analysis compared the 6 colorants using a 1-way analysis of variance for each of the 4 physical properties. When significant differences were observed, the Student-Newman-Keuls multiple range test was used to identify differences between groups at a significance level of.05.
Physical properties of maxillofacial elastomers were changed by the incorporation of coloring agents. Dry earth pigments, kaolin, and rayon flocking acted as a solid filler without bonding to the Silicone, and artists' oils and liquid cosmetics acted as a liquid phase without bonding to the silicone matrix.
No clearly superior colorant-elastomer combination was demonstrated in all the tests in this study.
颌面修复体的平均临床使用寿命约为6个月，届时需要重新制作，主要原因是修复体的颜色和物理性能退化。
这项分为三部分的研究的第一部分评估了着色剂对颌面弹性体物理性能的影响。
针对3种弹性体（A型硅橡胶医用胶粘剂、Silastic 4 - 4210和硅酮A - 2186）与6种着色剂（干土颜料、人造丝纤维植绒、艺术家油画颜料、高岭土、液体化妆品和无着色剂）的每种组合制作5个哑铃形和5个裤形试样，共180个试样。使用裤形试样评估硬度和撕裂强度。使用哑铃形试样评估极限拉伸强度和伸长百分比。弹性体内分析对4种物理性能中的每种性能使用单向方差分析比较6种着色剂。当观察到显著差异时，使用Student - Newman - Keuls多重范围检验在0.05的显著性水平下识别组间差异。
通过加入着色剂改变了颌面弹性体的物理性能。干土颜料、高岭土和人造丝植绒作为固体填料，未与硅酮结合，艺术家油画颜料和液体化妆品作为液相，未与硅酮基质结合。
在本研究的所有测试中，未证明有明显优越的着色剂 - 弹性体组合。
