目的:本研究采用显微CT技术评价不同年龄患者根管形态的变化。
方法:以13.68µm的像素大小扫描下颌第一磨牙(n=150),根据患者的年龄分为3组,并对配置进行分析,孔口,顶端孔,根长,运河容积,和表面积。在具有I型构型(n=109)的远端根中评估了形态2D和3D参数,并在68个近端根中评估了I型和III型峡部的形态。单因素方差分析后Tukey和Kruskal-Wallis检验用于统计分析(α=5%)。
结果:发现运河构型有很大差异。根长度无差异(p>0.05)。运河容积随着年龄的增长而减少(p<0.05),而表面积在≤30岁的患者中增加(p<0.05)。根管/根长没有差异,area,从孔到根尖的远端根具有I型构型(p>0.05),但2D和3D参数随着年龄的增长而显著下降(p<0.05)。总的来说,地峡屋顶的直径随着年龄的增长而减小(p<0.05)。在≥31岁的III型峡部患者中,从峡部底部到舌管孔的距离也减少了(p<0.05)。
结论:总体而言,下颌第一磨牙内侧根的内部形态受老化的影响比远端根受老化的影响更大。在两个根中显着减少的最相关的测试参数是根管系统的体积。
结论:对不同年龄患者下颌第一磨牙根管系统的精细解剖方面的详细评估表明,中根的内部形态比远端根受老化的影响更大。
OBJECTIVE: This study aimed to evaluate changes on root canal morphology in patients with different ages using micro-CT technology.
METHODS: Mandibular first molars (n = 150) were scanned at a pixel size of 13.68 µm, categorized into 3 groups according to patient\'s age and analyzed regarding configuration, orifices, apical foramina, root length, canal volume, and surface area. Morphological 2D and 3D parameters were evaluated in distal roots with Type I configuration (n = 109) as well as the morphology of isthmuses Types I and III in 68 mesial roots. One-way ANOVA post hoc Tukey and Kruskal-Wallis tests were used for statistical analyses (α = 5%).
RESULTS: A great variation in the canal configuration was found. No difference was observed in roots\' length (p > 0.05). Canal volume reduced with age (p < 0.05), while surface area increased (p < 0.05) in patients ≤ 30 years. There was no difference in canal/root length, area, and from foramen to the apex in distal roots with Type I configuration (p > 0.05), but 2D and 3D parameters significantly decreased with age (p < 0.05). Overall, the diameter of the isthmuses\' roof reduced with age (p < 0.05). In patients ≥ 31 years with Type III isthmus the distance from the isthmus floor to the foramen of the mesiolingual canal also decreased (p < 0.05).
CONCLUSIONS: Overall, the internal morphology of the mesial roots of mandibular first molars was more affected by aging than distal canals. The most relevant tested parameter that significantly reduced in both roots was the volume of the root canal systems.
CONCLUSIONS: A detailed evaluation of fine anatomical aspects of the root canal system of mandibular first molars of patients with different ages showed that the internal morphology of mesial roots is more affected by aging than distal canals.