Potts T V, Petrou A
Department of Physics, State University of New York, Buffalo 14260.
Lasers Surg Med. 1991;11(3):257-62. doi: 10.1002/lsm.1900110309.
This work was undertaken to determine if 488 nm light is transmitted through dentin in quantities adequate to polmerize resin located several milimeters from the light source (an optical fiber). The spread of polymerization in a camphorquinone activated resin due to 488 nm light emanating from an opaque plastic canal was compared with light emanating from a canal of the same diameter in tooth dentin. Results indicated that irradiation of a resin-filled chamber via an opaque canal generated a series of ellipsoidal forms, while irradiation via a root canal generated bullet-shaped forms of much larger volume and weight. The base of these bullet-shaped forms was flat against the dentin-resin interface and surrounded the canal. These results indicated that 488 nm argon laser light was transmitted through dentin and could act to polymerize resin at a distance of several millimeters from the canal. Further experiments verified that resin in lateral canals of tooth roots was readily polymerized by 488 nm light applied at low power levels (50 mW). These experiments demonstrate the effectiveness of the argon laser in polymerizing light activated dental resins located within or adjacent to tooth dentin at distances up to several milimeters from the fiberoptic terminus. The flexibility and control that these procedures make possible in the obturation of root canals may lead to substantial improvements in endodontic therapy.
开展这项工作是为了确定488纳米的光是否能透过牙本质，其光量是否足以聚合位于距光源（一根光纤）几毫米处的树脂。将由不透明塑料根管发出的488纳米光引发的樟脑醌活化树脂中的聚合扩散，与牙本质中相同直径根管发出的光引发的聚合扩散进行了比较。结果表明，通过不透明根管对充满树脂的腔室进行照射会产生一系列椭圆形，而通过根管照射则会产生体积和重量大得多的子弹形。这些子弹形的底部与牙本质-树脂界面平齐并围绕着根管。这些结果表明，488纳米的氩激光能够透过牙本质，并能在距根管几毫米的距离处使树脂聚合。进一步的实验证实，以低功率水平（50毫瓦）施加的488纳米光能够轻易地使牙根侧支根管中的树脂聚合。这些实验证明了氩激光在聚合位于牙本质内或紧邻牙本质、距光纤末端达几毫米距离处的光活化牙科树脂方面的有效性。这些操作在根管充填中所带来的灵活性和可控性可能会使牙髓治疗得到实质性改善。
