Hondrum S O
Dental Research Detachment, Walter Reed Army Institute of Research, Washington, DC, USA.
Int J Prosthodont. 1994 Nov-Dec;7(6):517-21.
A dental impression material must have sufficient strength to allow removal from a gingival sulcus without tearing; it must also have adequate elastic recovery. This study examined the tear energy, the permanent deformation upon extension, the energy absorbed to an estimated point of significant deformation, and the extent of permanent deformation at tear of polysulfide, polyether, and addition-reaction silicone impression materials. As expected, polysulfide material had a higher tear energy and strain at tear than either polyether or addition-reaction silicone materials. However, the more relevant clinical properties, such as energy absorbed per amount of deformation and tear at a point of minimal permanent deformation, favored the addition-reaction silicone material, followed by the polyether material.
牙科印模材料必须具有足够的强度，以便从龈沟中取出而不撕裂；它还必须有足够的弹性恢复能力。本研究检测了聚硫橡胶、聚醚和加成型硅橡胶印模材料的撕裂能、拉伸时的永久变形、达到估计的显著变形点时吸收的能量以及撕裂时的永久变形程度。正如预期的那样，聚硫橡胶材料的撕裂能和撕裂应变高于聚醚或加成型硅橡胶材料。然而，更相关的临床性能，如单位变形量吸收的能量和在最小永久变形点的撕裂情况，则有利于加成型硅橡胶材料，其次是聚醚材料。
