Baharav H, Abraham D, Cardash H S, Helft M
Maurice and Gabriela Goldschleger School of Dental Medicine, Tel Aviv University, Israel.
J Oral Rehabil. 1988 Mar;15(2):167-72. doi: 10.1111/j.1365-2842.1988.tb00766.x.
The effect of exposure time of a visible light source on the depth of polymerization and degree of hardness of a sample of Occlusin posterior composite resin was investigated. The border between cured and non-cured composite resin was identified by a change in colour and by applying pressure with a scalpel. Knoop hardness tests were performed perpendicular to the long axis of illumination. The composite resin nearer to the light source underwent more complete polymerization. Increased exposure time resulted in greater depth of cure. The rate of polymerization was greatest in the first 10 s. Maximum hardness measured up to a depth of 1 mm obtained after 80 s of exposure time. At greater depth, a decrease in Knoop hardness was observed. At exposures under 80 s, maximum hardness was not achieved even at a depth of only 1 mm.
研究了可见光源的照射时间对Occlusin后牙复合树脂样本聚合深度和硬度的影响。通过颜色变化和用手术刀施压来确定固化和未固化复合树脂之间的边界。努氏硬度测试垂直于照明的长轴进行。靠近光源的复合树脂发生了更完全的聚合。照射时间增加导致固化深度更大。聚合速率在最初10秒内最大。照射80秒后，在1毫米深度处测得的最大硬度。在更大深度处，观察到努氏硬度下降。在80秒以下的照射时间下，即使在仅1毫米的深度也未达到最大硬度。
