Department of Dentistry, State University of Ponta Grossa, Paraná, PR, Brazil.
Int J Dent Hyg. 2009 Nov;7(4):263-9. doi: 10.1111/j.1601-5037.2009.00371.x.
The purpose of this research was to evaluate molar furcation entrances and the width of periodontal curette blades used in periodontal instrumentation.
One hundred extracted molars (50 upper and 50 lower) were analysed. The furcation entrances were measured using orthodontic wires of different predetermined diameters: 0.4, 0.5, 0.6, 0.7, 0.8 and 0.9 mm. McCall 17-18, Gracey 5-6 and Gracey 5-6 mini-five curette blades were measured at their anterior (AT), middle (MT) and posterior (PT) thirds by a single trained investigator, through the use of a digital caliper.
The results showed significant differences (P < 0.0001) in relation to furcation entrances. The buccal upper molar furcations showed the narrowest dimensions. In relation to the blade diameter, significant differences among the instruments were found for their MT and PT (P < 0.0001), but not for the AT (P = 0.183). Significant differences were found among curette manufacturers. Nineteen per cent of evaluated furcations presented entrances <0.60 mm and 75% of the blades at their AT presented width >0.60 mm.
These findings demonstrated that some molar furcation entrances could not be adequately instrumented with the tested curettes. The use of other hand instruments, such as periodontal files, rotating instruments and ultrasonic devices should be taken into consideration during periodontal therapy.
本研究旨在评估磨牙分叉入口和牙周器械中使用的牙周刮治器刀片的宽度。
分析了 100 颗拔除的磨牙（50 颗上颌磨牙和 50 颗下颌磨牙）。使用不同预定直径的正畸丝（0.4、0.5、0.6、0.7、0.8 和 0.9 毫米）测量分叉入口。通过数字卡尺，由一名经过培训的研究人员测量 McCall 17-18、Gracey 5-6 和 Gracey 5-6 mini-five 刮治器刀片的前（AT）、中（MT）和后（PT）三分之一的宽度。
结果显示，分叉入口处存在显著差异（P<0.0001）。上颌磨牙颊侧分叉处的尺寸最小。关于刀片直径，在 MT 和 PT （P<0.0001）处，仪器之间存在显著差异，但在 AT 处没有差异（P=0.183）。不同制造商的刮治器之间也存在显著差异。19%的评估分叉处入口<0.60 毫米，75%的刀片在 AT 处的宽度>0.60 毫米。
这些发现表明，一些磨牙分叉入口可能无法用测试的刮治器充分治疗。在牙周治疗期间，应考虑使用其他手动器械，如牙周锉、旋转器械和超声设备。
