Murchison D F, Moore B K
USAF Medical Center, Keesler AFB, MS 39534.
Oper Dent. 1992 Jul-Aug;17(4):135-41.
Eight visible-light-activated liners were evaluated to assess the degree of polymerization by microhardness comparison. Knoop hardness number values were measured on 1.0 mm-thick specimens with varied exposure times (20, 40, 60 seconds) and distances from the curing source (0, 3, 6 mm). Statistical analysis of the nine groups within each material revealed significant differences for time and distance (P < 0.05). Application of the light for at least 40 seconds resulted in significantly higher Knoop hardness number values than specimens cured for 20 seconds. The highest Knoop hardness values were obtained if the tip of the light source was 3 mm away from the light-activated liner.
通过显微硬度比较评估了八种可见光激活衬层的聚合程度。在厚度为1.0毫米的样本上测量努氏硬度值，样本具有不同的曝光时间（20、40、60秒）以及与固化源的不同距离（0、3、6毫米）。对每种材料的九组数据进行统计分析，结果显示时间和距离存在显著差异（P < 0.05）。光照至少40秒产生的努氏硬度值显著高于固化20秒的样本。当光源尖端距离光激活衬层3毫米时，可获得最高的努氏硬度值。
