Department of Conservative Dentistry, Wonkang University Daejeon Dental Hospital, 77 Dunsan-Ro, Seo-Gu, Daejeon, 302-120, Republic of Korea.
BMC Oral Health. 2021 Oct 16;21(1):533. doi: 10.1186/s12903-021-01854-z.
In root canal preparations, it is important to maintain the original canal shape. However, it is difficult to accomplish this, especially due to the complex canal anatomy. This study aimed to compare the shaping ability of the ProTaper GOLD, WaveOne GOLD, and newly developed TruNatomy in simulated S-shaped canals.
The root canals of 60 S-shaped resin blocks were dyed using ink and photographed. The blocks were then randomly divided into three groups: group ProTaper GOLD (n = 20), WaveOne GOLD (n = 20), and TruNatomy (n = 20). The simulated canals were instrumented according to the NiTi file system and photographed again after being dyed with red ink. The pre- and post-preparation images were superimposed, and the amount of resin removed from both the mesial and distal sides of the canal measured up to 9 mm from the apical terminus, with a 1 mm increment. The preparation time was also calculated. A paired t-test was used to determine the degree of deviation at different levels within the groups. To compare the degree of transportation at different levels between the groups, one-way ANOVA and Kruskal-Wallis tests were performed according to the normality.
TruNatomy showed a significant deviation between the mesial and distal sides of the canal only in the coronal area at 6, 7, 8, and 9 mm levels of the canal (p < 0.05). When comparing the amount of transportation in the 3 groups at 9 different levels, TruNatomy showed significantly less canal transportation than the other groups at the 3-and 5-mm levels of the canal (p < 0.05), while ProTaper GOLD showed the largest amount of transportation in the apical curved area at the 2 and 3 mm levels (p < 0.05). TruNatomy removed less resin than other groups in all sections (p < 0.05), while ProTaper GOLD removed slightly more resin than WaveOne GOLD; however, there was no significant difference (p = 0.043). Shaping time was the least for TruNatomy, followed by the WaveOne GOLD and ProTaper GOLD (p < 0.05).
TruNatomy maintained the original apical canal curvature in S-shaped curved canals better than ProTaper GOLD and WaveOne GOLD.
在根管预备中，保持原始根管形态很重要。然而，这很难实现，尤其是由于根管解剖结构复杂。本研究旨在比较 Protaper GOLD、WaveOne GOLD 和新开发的 TruNatomy 在模拟 S 形根管中的成形能力。
将 60 个 S 形树脂块的根管用墨水染色并拍照。然后将这些块随机分为三组：ProTaper GOLD 组（n=20）、WaveOne GOLD 组（n=20）和 TruNatomy 组（n=20）。根据镍钛锉系统对模拟根管进行预备，并在根管内用红色墨水染色后再次拍照。将预备前后的图像叠加，测量从根尖终点起近端和远端 9mm 内根管壁的树脂去除量，增量为 1mm。同时计算预备时间。使用配对 t 检验确定组内不同水平的偏差程度。为了比较组间不同水平的偏移程度，根据正态性，采用单因素方差分析和 Kruskal-Wallis 检验。
TruNatomy 仅在根管的冠部 6、7、8 和 9mm 水平的近远中侧显示出显著的偏差（p<0.05）。在比较 3 组在 9 个不同水平的偏移量时，TruNatomy 在根管的 3 和 5mm 水平显示出比其他组明显更少的根管偏移（p<0.05），而 ProTaper GOLD 在根管的 2 和 3mm 水平显示出最大的根尖弯曲区域偏移（p<0.05）。TruNatomy 在所有节段去除的树脂均少于其他组（p<0.05），而 ProTaper GOLD 去除的树脂略多于 WaveOne GOLD；但无统计学差异（p=0.043）。TruNatomy 的预备时间最短，其次是 WaveOne GOLD 和 ProTaper GOLD（p<0.05）。
TruNatomy 比 ProTaper GOLD 和 WaveOne GOLD 更好地保持了 S 形弯曲根管的原始根尖弯曲度。
