Pathfile与WaveOne联合运用在模拟根管内的成型效果

目的 评价Pathfile与WaveOne联合运用在树脂模拟弯曲根管的成型效果.方法 选用20个弯曲根管树脂模块分组为W组(WaveOne)、PW组(Pathfile+WaveOne),记录两组根管预备的时间、器械分离的数量,并且通过扫描仪获取这两组预备前后的根管图像.使用Photoshop与ImageJ2X软件进行图像重叠并测量根管弯曲的变化值.从距根尖孔1 mm作为第一个观测点,在根管长轴方向每隔1 mm定一个观测点,测量每个观测点在弯曲内、外侧树脂去除量,共10个观测点,计算中心定位力.ImageJ2X软件测量根管内外侧壁的树脂去除量.对两组内,外侧去除树脂量的多少进行分析和比较.结果 两组均无器械分离的现象,两组根管预备的时间及两组根管预备长度变化的差异无统计学意义(P>0.05).但在距根尖4、5 mm位点处W组偏移程度为别为-0.085±0.05 mm、-0.312±0.068 mm,PW组的偏移程度分别为:-0.071±0.042 mm、-0.26±0.103 mm,两组间差异有统计学意义(P<0.05).结论 两组均能较好的完成根管预备,但两组预备后在根管中下段均有部分偏移,PW组的偏移程度较W组小.

Shaping ability of Pathfile and WaveOne in simulated root canals

Objective This study aims to evaluate the shaping capability of Pathfile and WaveOne in simulated root canals. Methods A total of 20 simulated resin blocks were divided randomly into two groups, group W prepared with WaveOne alone. Group PW prepared with WaveOne and Pathfile. Preparation time and number of separated instru-ments were measured respectively. Pre-and post-operative images were obtained with a scanner and superimposed through Photoshop and ImageJ2X. The changes in canal bending curvature and material removal from the inner and out-er canal walls at 10 points beginning at 1mm from the end point of the canal were measured with ImageJ2X. Centering capability was determined accordingly by comparing and analyzing the material removal from the inner and outer canal walls. Results Two groups have no occurrence of instrument separation, no statics significance in root canal prepara-tion and the changes of root canal working length differences (P>0.05). But at position of root canal point 4 to 5 mm, the misalignment of group W were 0.085 ± 0.05 mm and-0.312 ± 0.068 mm, the misalignment of group PW were-0.071 ± 0.042 mm,-0.26 ± 0.103 mm (P < 0.05). Conclusion Both two groups instruments showed good performance in preparation but both created some apical transportation. However, group PW exhibited more superior centering capabili-ty than group W in the middle part of the canal.