Oh Young-Ryul, Ku Hye-Min, Kim Dohyun, Shin Su-Jung, Jung Il-Young
Department of Conservative Dentistry and Oral Science Research Center, Microscope Center, Yonsei University College of Dentistry, Seoul 03722, Korea.
Department of Preventive Dentistry & Public Oral Health, BK 21 PLUS Project, Yonsei University College of Dentistry, Seoul 03722, Korea.
Materials (Basel). 2020 Oct 31;13(21):4914. doi: 10.3390/ma13214914.
This study evaluated the effectiveness of NiTi ultrasonic tips for () biofilm removal in simulated complex root canals. Sixty root canal models consisting of a 30-degree curved main canal and two lateral canals were constructed from polydimethylsiloxane and incubated with . Irrigants in root canals were activated using a manual syringe (SI), a stainless steel (SS) instrument, a nickel-titanium (Ni-Ti) ultrasonic instrument, or a sonic instrument (EA). Instruments of SI, SS, and NiTi-9 groups were placed 9 mm from the apex, whereas those in NiTi-2 and EA groups were placed 2 mm from the apex. The efficacy of each method was determined as the ratio of fluorescence concentration before and after activation. In the apical curved canal, the highest efficacy was found in the NiTi-2 group (99.40%), followed by SI (84.25%), EA (80.38%), SS (76.93%), and NiTi-9 (67.29%) groups. In lateral canals 1 and 2, the efficacy was the highest in the NiTi-2 group and the lowest in the SI group. The NiTi ultrasonic instrument could effectively remove biofilms in the curved canal and lateral canals. This instrument should be introduced close to the working length. An up-and-down motion of the activation instrument is recommended.
本研究评估了镍钛超声器械头在模拟复杂根管中去除（）生物膜的有效性。用聚二甲基硅氧烷构建了60个根管模型，每个模型包含一条30度弯曲的主根管和两条侧支根管，并使其与（）一起孵育。使用手动注射器（SI）、不锈钢（SS）器械、镍钛（Ni-Ti）超声器械或声波器械（EA）对根管内的冲洗液进行激活。SI、SS和NiTi-9组的器械放置在距根尖9 mm处，而NiTi-2组和EA组的器械放置在距根尖2 mm处。每种方法的有效性通过激活前后荧光浓度的比值来确定。在根尖弯曲根管中，NiTi-2组的有效性最高（99.40%），其次是SI组（84.25%）、EA组（80.38%）、SS组（76.93%）和NiTi-9组（67.29%）。在侧支根管1和2中，NiTi-2组的有效性最高，SI组的有效性最低。镍钛超声器械能有效去除弯曲根管和侧支根管中的生物膜。该器械应靠近工作长度引入。建议激活器械做上下运动。
