Abstract：
BACKGROUND: Innovative file systems have been recently introduced, claiming improved effectiveness and superior ability to preserve the tooth structure, still allowing an efficient preparation and disinfection up to the apical region. Regardless, few data are available on the comparative effectiveness of the most recently developed systems. Thus, this ex vivo study aimed to comparatively evaluate, for the first time, the functionality of WaveOne Gold (WOG), TruNatomy (TN), and ProTaper Ultimate (PU) file systems regarding canal shaping, dentin preservation, and smear layer removal ability.
METHODS: Human maxillary incisors were randomly divided for instrumentation with one of the assayed systems. Canal shaping ability and pericervical dentin preservation were characterized through microtomographic evaluation and morphometric assessment (n = 15). Smear layer removal ability was evaluated by scanning electron microscopy (SEM) (n = 6).
RESULTS: TN and PU presented the lowest canal volume variation upon instrumentation, found to be significantly lower than that attained with WOG (P < .05). Pericervical dentin was reduced in all groups upon instrumentation, with TN evidencing the highest preservation, quantitatively similar to PU, and significantly higher than that attained with WOG (P < .05). SEM imaging revealed the presence of scattered remnants of the smear layer and partially opened dentinal tubules at the apical portion, with no significant differences between systems.
CONCLUSIONS: TN and PU allowed for the highest tissue preservation, reporting the lowest volume variation and the highest preservation of the pericervical dentin. None of the assessed systems provided a complete removal of the smear layer in the apical region.
METHODS: Human maxillary incisors were randomly divided for instrumentation with one of the assayed systems. Canal shaping ability and pericervical dentin preservation were characterized through microtomographic evaluation and morphometric assessment (n = 15). Smear layer removal ability was evaluated by scanning electron microscopy (SEM) (n = 6).
RESULTS: TN and PU presented the lowest canal volume variation upon instrumentation, found to be significantly lower than that attained with WOG (P < .05). Pericervical dentin was reduced in all groups upon instrumentation, with TN evidencing the highest preservation, quantitatively similar to PU, and significantly higher than that attained with WOG (P < .05). SEM imaging revealed the presence of scattered remnants of the smear layer and partially opened dentinal tubules at the apical portion, with no significant differences between systems.
CONCLUSIONS: TN and PU allowed for the highest tissue preservation, reporting the lowest volume variation and the highest preservation of the pericervical dentin. None of the assessed systems provided a complete removal of the smear layer in the apical region.
摘要：
背景：最近引入了创新的文件系统，声称改善的有效性和优越的能力，以保持牙齿结构，仍然允许有效的准备和消毒到顶端区域。无论如何,关于最近开发的系统的比较有效性的数据很少。因此，这项离体研究旨在比较评估，第一次,WaveOneGold(WOG)的功能，TruNatomy(TN),和ProtaperUltimate(PU)文件系统，牙本质保存,和涂抹层去除能力。
方法：将人上颌切牙随机分为一个测定系统。通过显微层析成像评估和形态测量评估（n=15）来表征管道成形能力和宫颈牙本质保存。通过扫描电子显微镜(n=6)评价了涂抹层去除能力。
结果：TN和PU在仪器上表现出最低的运河容积变化，发现显著低于WOG(p<0.05)。所有组的子宫颈牙本质在器械上都减少了，TN证明了最高的保存，定量上与PU相似，显著高于WOG(p<0.05)。SEM成像显示，在根尖部分存在涂片层的分散残留物和部分开放的牙本质小管，系统之间没有显著差异。
结论：TN和PU允许最高的组织保存，报告最低体积变化和最高保存的子宫颈牙本质。评估的系统均未完全去除顶端区域的涂片层。
方法：将人上颌切牙随机分为一个测定系统。通过显微层析成像评估和形态测量评估（n=15）来表征管道成形能力和宫颈牙本质保存。通过扫描电子显微镜(n=6)评价了涂抹层去除能力。
结果：TN和PU在仪器上表现出最低的运河容积变化，发现显著低于WOG(p<0.05)。所有组的子宫颈牙本质在器械上都减少了，TN证明了最高的保存，定量上与PU相似，显著高于WOG(p<0.05)。SEM成像显示，在根尖部分存在涂片层的分散残留物和部分开放的牙本质小管，系统之间没有显著差异。
结论：TN和PU允许最高的组织保存，报告最低体积变化和最高保存的子宫颈牙本质。评估的系统均未完全去除顶端区域的涂片层。
