Flemmig T F, Petersilka G J, Mehl A, Hickel R, Klaiber B
Department of Periodontology, Julius Maximilian University, Würzburg, Germany.
J Periodontol. 1998 May;69(5):547-53. doi: 10.1902/jop.1998.69.5.547.
This study assessed defect depth and volume resulting from root instrumentation using a magnetostrictive ultrasonic scaler with a slim scaling tip (P 12) in vitro. Combinations of the following working parameters were analyzed: lateral forces of 0.5 N, 1 N, and 2 N; tip angulations of 0 degrees, 45 degrees, and 90 degrees; power settings of low, medium, and high; and instrumentation time of 10, 20, 40, and 80 seconds. Defects were quantified using a 3-dimensional optical laser scanner. Lateral force had the greatest influence on defect volume compared to tip angulation and power setting (beta-weights 0.53+/-0.04, 0.17+/-0.04, and 0.19+/-0.04, respectively). Lateral force and tip angulation had similar effects on defect depth, but both effects were greater compared to power setting (beta-weights 0.43+/-0.04, 0.49+/-0.04, and 0.19+/-0.04, respectively). The various combinations of the assessed working parameters showed synergistic effects resulting in a wide range of defect depths (14.1+/-1.7 microm to 410.5+/-51.1 microm) and volumes (0.0084+/-0.0057 mm3 to 1.3+/-0.079 mm3). Severe root damage (defect depth >50 microm) at 40 seconds instrumentation time occurred under most combinations of lateral force, angulation, and power settings. The only exceptions were combinations of: 1) 0 degrees angulation, 0.5 N and 1 N lateral force at any power setting and 2) 45 degrees angulation, 0.5 N lateral force at low and medium power setting. The efficacy of the assessed magnetostrictive ultrasonic scaler may be adapted to the various clinical needs by adjusting the lateral force, tip angulation, and power setting.
本研究在体外评估了使用带有纤细洁治头（P 12）的磁致伸缩超声洁牙器进行根管预备后产生的缺损深度和体积。分析了以下工作参数的组合：0.5 N、1 N和2 N的侧向力；0度、45度和90度的洁治头角度；低、中、高功率设置；以及10、20、40和80秒的预备时间。使用三维光学激光扫描仪对缺损进行量化。与洁治头角度和功率设置相比，侧向力对缺损体积的影响最大（β权重分别为0.53±0.04、0.17±0.04和0.19±0.04）。侧向力和洁治头角度对缺损深度有相似的影响，但与功率设置相比，两者的影响都更大（β权重分别为0.43±0.04、0.49±0.04和0.19±0.04）。所评估的工作参数的各种组合显示出协同效应，导致了广泛的缺损深度（14.1±1.7微米至410.5±51.1微米）和体积（0.0084±0.0057立方毫米至1.3±0.079立方毫米）。在大多数侧向力、角度和功率设置的组合下，预备40秒时会出现严重的牙根损伤（缺损深度>50微米）。唯一的例外是以下组合：1）0度角度、任何功率设置下0.5 N和1 N的侧向力，以及2）45度角度、低功率和中功率设置下0.5 N的侧向力。通过调整侧向力、洁治头角度和功率设置，所评估的磁致伸缩超声洁牙器的功效可适应各种临床需求。
