Larsen C Michael, Watanabe Ikuya, Glickman Gerald N, He Jianing
Department of Endodontics, Baylor College of Dentistry, The Texas A&M University System Health Science Center, Dallas, TX 75246, USA.
J Endod. 2009 Mar;35(3):401-3. doi: 10.1016/j.joen.2008.12.010.
Recently, a new generation of nickel-titanium (NiTi) rotary instruments including the Twisted File (TF; Sybron Dental Specialties, Orange, CA) and ProFile GT Series X (GTX; Denstply, Tulsa Dental Specialties, Tulsa, OK) was introduced to the market. The purpose of this study was to determine if these new NiTi instruments were more resistant to cyclic fatigue compared with traditionally ground NiTi rotary instruments such as EndoSequence (ES; Brasseler, Savannah, GA) and ProFile (PF; Dentsply, Tulsa Dental Specialties). Size #25 TF, ES, and PF and size #20 GTX with .04 and .06 tapers were tested in a simulated canal with 60 degrees angle of curvature and a 3-mm radius. The number of rotations until fracture was recorded for each instrument. Among both .04 and .06 tapered files, #20 GTX files performed significantly better than all other files tested with tip sizes of #25 (p < 0.001); this may be because of the increased flexibility in the #20 files compared with #25 files. TF was significantly more resistant to cyclic fatigue than ES (p < 0.05) but not different from PF (p > 0.05) with the same tip size. The new manufacturing processes appeared to offer greater resistance to cyclic fatigue in a simulated canal model.
最近，包括扭转锉（TF；Sybron牙科专业公司，加利福尼亚州奥兰治）和ProFile GT X系列（GTX；登士柏国际公司，俄克拉荷马州塔尔萨市塔尔萨牙科专业公司）在内的新一代镍钛（NiTi）旋转器械被推向市场。本研究的目的是确定与传统磨削的NiTi旋转器械如EndoSequence（ES；布拉塞勒公司，佐治亚州萨凡纳）和ProFile（PF；登士柏国际公司，俄克拉荷马州塔尔萨市塔尔萨牙科专业公司）相比，这些新型NiTi器械是否更耐循环疲劳。对尺寸为#25的TF、ES和PF以及尺寸为#20、锥度为.04和.06的GTX在曲率为60度、半径为3毫米的模拟根管中进行测试。记录每种器械直至折断的旋转次数。在锥度为.04和.06的锉中，#20的GTX锉在尖端尺寸为#25时的表现明显优于所有其他测试锉（p < 0.001）；这可能是因为#20锉比#25锉的柔韧性增加。在相同尖端尺寸下，TF比ES更耐循环疲劳（p < 0.05），但与PF无差异（p > 0.05）。新的制造工艺在模拟根管模型中似乎对循环疲劳有更大的抵抗力。
