Knowles K I, Ibarrola J L, Christiansen R K
Department of Endodontics, Creighton University, School of Dentistry, Omaha, Nebraska, USA.
Int Endod J. 1996 Mar;29(2):113-7. doi: 10.1111/j.1365-2591.1996.tb01171.x.
The LightSpeed root canal instrument is similar in design to the Canal Master instrument with the exception of being engine driven and fabricated from nickel-titanium alloy. The purpose of the design of these instruments is to reduce apical transportation of the canal during cleansing and shaping procedures. Twenty extracted human molar teeth with roots of varying degrees of curvature were used in this study. A double exposure radiographic technique was used to assess the presence or absence of apical transportation resulting between the initial instrument and the final instrument, a size 50 LightSpeed. Only one of the 20 teeth examined exhibited apical transportation. Results of this study suggest that little or no apical canal transportation could be expected when curved canals are instrumented using the LightSpeed root canal instruments.
LightSpeed根管器械在设计上与Canal Master器械相似，不同之处在于它由镍钛合金制成且由发动机驱动。这些器械的设计目的是在清洁和成形过程中减少根管的根尖偏移。本研究使用了20颗牙根弯曲程度不同的拔除的人类磨牙。采用双重曝光射线照相技术来评估在初始器械和最终器械（50号LightSpeed器械）之间是否存在根尖偏移。在检查的20颗牙齿中，只有一颗出现了根尖偏移。本研究结果表明，使用LightSpeed根管器械处理弯曲根管时，根尖根管偏移很少或不会出现。
