Bouvier D, Duprez J P, Nguyen D, Lissac M
UFR d'Odontologie, Lyon, France.
Bull Group Int Rech Sci Stomatol Odontol. 1994 Mar-Jun;37(1-2):5-12.
CO2 laser irradiation brings about structural modifications at the dentin surface. The aim of this study was to compare the tensile strength of composite resin bonded to unlased dentin and lased dentin. Dentin specimens were prepared by vestibular surface sectioning, exposing a plane dentinal surface. 40 specimens received 20 individual laser impacts with a power of 4 W and a duration of 0.1 s. 20 specimens received no laser irradiation. Half of the 60 specimens was treated with Scotchbond 2 and the other one with Scotchbond Multipurpose. Composite cylinders were polymerised for 40 seconds to these specimens. Tensile bond strengths were determined at a crosshead speed of 5 mm/min and fractured surfaces were examined at SEM after the test. Unlased dentin had significantly higher bond strength that the lased dentin.
二氧化碳激光照射会使牙本质表面发生结构改变。本研究的目的是比较复合树脂与未照射激光的牙本质和照射激光的牙本质粘结后的拉伸强度。通过前庭表面切片制备牙本质标本，暴露出一个平面牙本质表面。40个标本接受了20次单独的激光冲击，功率为4瓦，持续时间为0.1秒。20个标本未接受激光照射。60个标本中的一半用Scotchbond 2处理，另一半用Scotchbond多功能粘结剂处理。将复合圆柱体聚合40秒后粘结到这些标本上。以5毫米/分钟的十字头速度测定拉伸粘结强度，并在测试后通过扫描电子显微镜检查断裂表面。未照射激光的牙本质的粘结强度明显高于照射激光的牙本质。
