Bağis Y H, Rueggeberg F A
Department of Conservative Dentistry, University of Ankara School of Dentistry, Ankara, Turkey.
Dent Mater. 1997 Jul;13(4):228-32. doi: 10.1016/S0109-5641(97)80033-4.
This research evaluated the relationship between post-cure heating temperature and duration on the monomer conversion of a commercial light-activated resin composite.
Disc-shaped composite specimens (10 x 1 mm) were initially light-cured and then submitted to one of the following post-cure.
None (control), 50 degrees, 75 degrees, 100 degrees or 125 degrees C for 0.5, 1, 3, 5, or 7 min. After curing, specimens were stored in the dark at room temperature. Monomer conversion of all specimens was then determined using infrared spectroscopy.
Post-cure temperature was 12 times more influential than was heal duration on the extent of resin cure. The extent of cure increased linearly with an increase in post-cure temperature. Post-cure specimens that were heated between 3 and 7 min demonstrated equivalent cure values. All post-cure healing conditions resulted in significantly higher cure values than the light-cured only control.
Physical properties of post-cure heated composites may change with respect to aging and water, but monomer conversion values of post-cure heated materials remain unaltered. Results of this study validate the use of relatively high temperatures for increasing the extent of monomer conversion. Such increases may lead to more biocompatible restorations.
本研究评估了后固化加热温度和持续时间与一种市售光固化树脂复合材料单体转化率之间的关系。
将圆盘状复合材料试样（10×1毫米）先进行光固化，然后进行以下后固化处理之一。
无（对照）、50℃、75℃、100℃或125℃，持续0.5、1、3、5或7分钟。固化后，将试样在室温下避光保存。然后使用红外光谱法测定所有试样的单体转化率。
后固化温度对树脂固化程度的影响比固化持续时间大12倍。固化程度随后固化温度的升高呈线性增加。在3至7分钟之间加热的后固化试样显示出等效的固化值。所有后固化处理条件下的固化值均显著高于仅光固化的对照。
后固化加热复合材料的物理性能可能会随老化和水而变化，但后固化加热材料的单体转化率值保持不变。本研究结果验证了使用相对较高温度来提高单体转化率的方法。这种提高可能会带来生物相容性更好的修复体。
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