Leal Renata Maira de Souza, Copelli Felipe Andretta, Pinto Jáder Camilo, Tanomaru-Filho Mario, Duarte Marco Antonio Hungaro, Cavenago Bruno Cavalini
Department of Restorative Dentistry, Federal University of Paraná, Curitiba, Paraná, Brazil.
Department of Restorative Dentistry, School of Dentistry of Araraquara, Paulista State University, Araraquara, São Paulo, Brazil.
Saudi Dent J. 2024 Apr;36(4):568-573. doi: 10.1016/j.sdentj.2024.01.010. Epub 2024 Jan 14.
The anatomical configuration classified as Vertucci's type III is described as the second most prevalent in mandibular incisors.
Thirty-six Vertucci's type III mandibular incisors were evaluated by micro-computed tomography (micro-CT) and divided into 3 groups (n = 12) according to the root canal preparation protocol (HyFlex CM [HCM], HyFlex EDM [HEDM], and Sequence Rotary File [SRF]). The teeth were scanned before and after performing 0.25 mm and 0.40 mm apical diameter preparations. The canal volume, dentin thickness, percentage of accumulated debris and untouched canal areas, transportation, and centering ability were measured. The data were statistically analyzed by ANOVA, Tukey, Kruskal-Wallis, and Dunn tests (P < 0.05).
The volume increase was more evident in the apical third. After 0.40 mm preparation, the SRF system provided a higher reduction (P < 0.05) in dentin thickness on the buccal surface 1 mm from the apex. There was higher canal transportation in the bucco-lingual direction. The 0.40 mm apical preparation reduced the percentage of untouched canal areas. The apical third had the highest percentage of untouched canal areas. The cervical third had the lowest volume of accumulated debris.
Increasing the apical preparation to a diameter of 0.40 mm with the HCM, HEDM, and SRF systems in Vertucci's type III root canals of mandibular incisors proved to be safe and effective, reducing untouched canal areas.
Root flattening can be intense to the point of generating a root canal bifurcation. Despite the decrease in the root canal diameter, a greater enlargement of the apical region is necessary and safe.
被归类为韦尔图奇III型的解剖结构被描述为在下颌切牙中第二常见。
通过微计算机断层扫描（显微CT）评估36颗韦尔图奇III型下颌切牙，并根据根管预备方案（HyFlex CM [HCM]、HyFlex EDM [HEDM]和序列旋转锉[SRF]）分为3组（n = 12）。在进行0.25毫米和0.40毫米根尖直径预备前后对牙齿进行扫描。测量根管容积、牙本质厚度、累积碎屑百分比和未触及的根管面积、根管偏移和就位能力。数据通过方差分析、Tukey检验、Kruskal-Wallis检验和Dunn检验进行统计学分析（P < 0.05）。
容积增加在根尖三分之一处更为明显。在进行0.40毫米预备后，SRF系统在距根尖1毫米处的颊侧表面牙本质厚度减少更多（P < 0.05）。在颊舌方向上根管偏移更大。0.40毫米根尖预备减少了未触及的根管面积百分比。根尖三分之一处未触及的根管面积百分比最高。颈三分之一处累积碎屑的容积最低。
在下颌切牙的韦尔图奇III型根管中，使用HCM、HEDM和SRF系统将根尖预备直径增加到0.40毫米被证明是安全有效的，减少了未触及的根管面积。
根管变平可能严重到产生根管分叉。尽管根管直径减小，但根尖区域更大程度的扩大是必要且安全的。
