Hartmann Mateus Silveira Martins, Fontanella Vânia Regina Camargo, Vanni José Roberto, Fornari Volmir João, Barletta Fernando Branco
Department of Endodontics, Uningá Dental School, Passo Fundo, RS, Brazil.
Braz Dent J. 2011;22(4):288-93. doi: 10.1590/s0103-64402011000400005.
This study used computed tomography (CT) to compare apical canal transportation in mesiobuccal canals of maxillary molars prepared with different techniques. Sixty teeth were assigned to 3 groups (n=20), according to the technique used for root canal instrumentation: hand instrumentation with K-Flexofiles, K-Flexofiles activated by an oscillatory system and ProTaper NiTi rotary system. Pre and post-instrumentation CT images were obtained 3 mm short of the apical foramen and were superimposed to compare canal transportation. Data were analyzed statistically by ANOVA and Tukey's test using the SPSS software (α=0.05). In the buccal direction, the manual technique produced significantly less canal transportation than the oscillatory technique (p<0.05) and both were similar to the rotary technique (p>0.05). In the distal and distopalatal directions, the oscillatory technique produced more canal transportation (p<0.05). In the mesiopalatal direction, the oscillatory technique produced more canal transportation than the manual technique (p<0.05), and both were similar to the rotary technique (p>0.05). In conclusion, all techniques produced canal transportation, and the oscillatory technique produced the greatest removal of root dentin toward the innerside of the root curvature.
本研究采用计算机断层扫描（CT）比较不同技术预备上颌磨牙近中颊根管时根尖孔处根管的偏移情况。根据根管预备技术，将60颗牙齿分为3组（每组n = 20）：使用K-Flex锉手动预备、使用振荡系统激活K-Flex锉预备以及使用ProTaper镍钛旋转系统预备。在距根尖孔3 mm处获取预备前后的CT图像，并进行叠加以比较根管偏移情况。使用SPSS软件通过方差分析（ANOVA）和Tukey检验对数据进行统计学分析（α = 0.05）。在颊侧方向，手动预备技术导致的根管偏移显著少于振荡预备技术（p < 0.05），且二者均与旋转预备技术相似（p > 0.05）。在远中及远中腭侧方向，振荡预备技术导致更多的根管偏移（p < 0.05）。在近中腭侧方向，振荡预备技术导致的根管偏移多于手动预备技术（p < 0.05），且二者均与旋转预备技术相似（p > 0.05）。总之，所有技术均会导致根管偏移，且振荡预备技术导致向牙根弯曲内侧的牙本质去除量最大。
