Fumes A C, Sousa-Neto M D, Leoni G B, Versiani M A, da Silva L A B, da Silva R A B, Consolaro A
Department of Pediatric Dentistry, Dental School of Ribeirão Preto, University of São Paulo, Av. do Café s/no, Bairro Monte Alegre, São Paulo, Ribeirão Preto, CEP 14049-904, Brazil.
Eur Arch Paediatr Dent. 2014 Oct;15(5):317-26. doi: 10.1007/s40368-014-0117-0. Epub 2014 Feb 22.
This was to investigate the root canal morphology of primary molar teeth using micro-computed tomography.
Primary maxillary (n = 20) and mandibular (n = 20) molars were scanned at a resolution of 16.7 μm and analysed regarding the number, location, volume, area, structured model index (SMI), area, roundness, diameters, and length of canals, as well as the thickness of dentine in the apical third. Data were statistically compared by using paired-sample t test, independent sample t test, and one-way analysis of variance with significance level set as 5%.
Overall, no statistical differences were found between the canals with respect to length, SMI, dentine thickness, area, roundness, and diameter (p > 0.05). A double canal system was observed in the mesial and mesio-buccal roots of the mandibular and maxillary molars, respectively. The thickness in the internal aspect of the roots was lower than in the external aspect. Cross-sectional evaluation of the roots in the apical third showed flat-shaped canals in the mandibular molars and ribbon- and oval-shaped canals in the maxillary molars.
External and internal anatomy of the primary first molars closely resemble the primary second molars. The reported data may help clinicians to obtain a thorough understanding of the morphological variations of root canals in primary molars to overcome problems related to shaping and cleaning procedures, allowing appropriate management strategies for root canal treatment.
本研究旨在使用显微计算机断层扫描技术研究乳磨牙的根管形态。
对20颗上颌乳磨牙和20颗下颌乳磨牙进行扫描，分辨率为16.7μm，并分析根管的数量、位置、体积、面积、结构模型指数（SMI）、面积、圆度、直径和长度，以及根尖三分之一处牙本质的厚度。采用配对样本t检验、独立样本t检验和单因素方差分析对数据进行统计学比较，显著性水平设定为5%。
总体而言，各根管在长度、SMI、牙本质厚度、面积、圆度和直径方面均未发现统计学差异（p>0.05）。在下颌和上颌磨牙的近中根和近中颊根中分别观察到双根管系统。牙根内部的厚度低于外部。根尖三分之一处牙根的横断面评估显示，下颌磨牙的根管呈扁平状，上颌磨牙的根管呈带状和椭圆形。
第一乳磨牙的外部和内部解剖结构与第二乳磨牙非常相似。所报告的数据可能有助于临床医生全面了解乳磨牙根管的形态变异，以克服与根管预备和清理程序相关的问题，从而制定合适的根管治疗管理策略。
