Abdelraouf Rasha M, Bayoumi Rania E, Hamdy Tamer M
Biomaterials Department, Faculty of Dentistry, Cairo University, Cairo 11553, Egypt.
Biomaterials Department, Faculty of Dentistry (Girls), Azhar University, Cairo 11754, Egypt.
Polymers (Basel). 2021 Aug 30;13(17):2923. doi: 10.3390/polym13172923.
Alginate impression is a common dental polymeric material, presented as powder to be mixed with water.
Two commercial alginate products were mixed in different viscosities. Viscosity was measured by a viscometer. For the tear strength test, V-shaped specimens were used. For detail reproduction, a die with three scribed lines was used. Clinical dental impressions were examined by stereomicroscope.
The alginate specimens mixed with a higher powder/water ratio showed a higher viscosity and tear strength compared to those with a lower powder/water ratio. Both alginate mixtures reproduced two scribed lines in a detail reproduction test. On the other hand, no clear clinical difference was detected when examining dental impressions mixed with a different powder/water ratio.
Although increasing the powder/water ratio of mixed alginate raised the resultant viscosity and tear strength by an test, clinically, no clear difference in tearing was detected. Detail reproduction was minimally affected by the variation in powder/water ratio.
藻酸盐印模材料是一种常见的牙科聚合材料，呈粉末状，需与水混合使用。
将两种市售藻酸盐产品以不同粘度进行混合。用粘度计测量粘度。撕裂强度测试使用V形试样。细节再现测试使用带有三条划线的模具。通过体视显微镜检查临床牙科印模。
与粉末/水比例较低的藻酸盐试样相比，粉末/水比例较高的藻酸盐试样表现出更高的粘度和撕裂强度。在细节再现测试中，两种藻酸盐混合物都能再现两条划线。另一方面，检查不同粉末/水比例混合的牙科印模时，未发现明显的临床差异。
虽然通过测试发现增加混合藻酸盐的粉末/水比例会提高所得的粘度和撕裂强度，但在临床上，未检测到撕裂方面的明显差异。细节再现受粉末/水比例变化的影响最小。
