Stadler L E, Wennberg A, Olgart L
Swed Dent J. 1986;10(1-2):37-43.
The technical results of two different techniques for instrumentation of root canals were evaluated. The study comprised 520 roots with various degree of curvature treated by supervised dental students using either a reaming of a filing technique. The results indicated that treatment complications were mainly associated with severely curved (greater than or equal to 35 degrees) canals (15-20% of the molars). Instrument breakage and lateral deviation from original canal curvature were more frequent with the reaming technique whereas overfilling and root perforation dominated with the filing technique. Loss in working length occurred with both techniques. It is suggested that the frequency of complications during instrumentation of curved canals might be diminished if files are used for the enlargement of the canal and reamers are used for the final shaping of the apical part.
对两种不同的根管预备技术的技术结果进行了评估。该研究包括520颗不同弯曲程度的牙根，由牙科专业学生在监督下使用扩锉技术或锉削技术进行治疗。结果表明，治疗并发症主要与严重弯曲（大于或等于35度）的根管有关（15%-20%的磨牙）。扩锉技术中器械折断和偏离原始根管弯曲的情况更频繁，而锉削技术中则以超充和根管穿孔为主。两种技术均出现了工作长度的丢失。建议在弯曲根管预备过程中，如果使用锉进行根管扩大，使用扩孔钻进行根尖部的最终成形，并发症的发生率可能会降低。
