Aimjirakul Pantira, Masuda Takayuki, Takahashi Hidekazu, Miura Hiroyuki
Fixed Prosthodontics, Department of Restorative Sciences, Division of Oral Health Sciences, Graduate School, Tokyo Medical and Dental University, Japan.
Int J Prosthodont. 2003 Jul-Aug;16(4):385-9.
This study evaluated the ability of five elastomeric impression materials to penetrate the gingival sulcus beyond the preparation margin.
A model of brass and agar gel was made to simulate human sulci and clinical gingival conditions. Two addition-curing silicones, one condensation-curing silicone, one polyether, and one polysulfide were tested. Ninety impressions of the model were made, six impressions with each material with differing sulcular widths. The centers of sulcular extension of these impressions were found with a measuring microscope.
Two-way ANOVA showed significant differences among impression materials, sulcular widths, and their interactions. The penetration ability of polyether showed greater extension than the other materials, regardless of sulcular width. Polysulfide penetrated less than the two silicones with 0.2- and 0.1-mm sulcular widths but more with the narrow 0.05-mm sulcular width.
These results suggest that the viscoelastic behavior of elastomers depends on the width of sulci. Moreover, the sulcus simulation model effectively contributes to the investigation of their characteristics.
本研究评估了五种弹性印模材料穿透龈沟至预备边缘以外的能力。
制作了一个由黄铜和琼脂凝胶组成的模型，以模拟人体龈沟和临床牙龈状况。测试了两种加成型硅橡胶、一种缩合型硅橡胶、一种聚醚和一种多硫化物。对该模型制作了90个印模，每种材料制作6个印模，龈沟宽度不同。用测量显微镜确定这些印模龈沟延伸的中心位置。
双向方差分析显示印模材料、龈沟宽度及其相互作用之间存在显著差异。无论龈沟宽度如何，聚醚的穿透能力比其他材料显示出更大的延伸。在龈沟宽度为0.2毫米和0.1毫米时，多硫化物的穿透比两种硅橡胶少，但在龈沟宽度为0.05毫米时，穿透比两种硅橡胶多。
这些结果表明弹性体的粘弹性行为取决于龈沟宽度。此外，龈沟模拟模型有效地有助于对其特性的研究。
