Journal of Conservative Dentistry
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ORIGINAL RESEARCH ARTICLE
Year : 2018  |  Volume : 21  |  Issue : 1  |  Page : 57-62

Radiographic and micro-computed tomography classification of root canal morphology and dentin thickness of mandibular incisors


Department of Restorative Dentistry, Araraquara Dental School, São Paulo State University, Araraquara, São Paulo, Brazil

Correspondence Address:
Prof. Mário Tanomaru-Filho
Rua Humaitá, 1680, Caixa Postal 331, Centro, 14801-903 Araraquara, SP
Brazil
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/JCD.JCD_230_16

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Context: Root canal anatomy is evaluated using different methodologies. Aims: The aim of this study is to evaluate and classify root canal morphology and dentin thicknesses (DT), comparing radiographic and micro-computed tomography (CT) analysis. Materials and Methods: Canal diameter and DT of mandibular incisors (n = 520) were evaluated using digital radiographs in buccolingual (BL) and mesiodistal (MD) directions. The diameter ratio (DR) BL/MD was classified: flattened (FL, DR >4); oval (OV, 2≤ DR ≥4); rounded (RN, 1.1< DR >2); round (RO, 0.9≤ DR ≥1.1); and with BL flatness (BL, DR <0.9). OV (n = 110) were subjected to micro-CT. DT and DR were evaluated at 3, 6, and 9 mm. ANOVA, Tukey, and paired Wilcoxon tests (P < 0.05) were used. Results: Radiographic classification was 23.3% FL, 41.3% OV, 27.3% RN, 4.5% RO, and 3.6% BL. DT was similar. Radiographic DT at 3 and 9 mm was greater than micro-CT (P < 0.05) and was similar at 6 mm (P > 0.05). DR differed between the analyses. Oval canals were predominant at all levels radiographically and at 9 and 6 mm in micro-CT analysis, with greater variation at 3 mm. Conclusion: Oval root canals are predominant in mandibular incisors at 9 mm. Radiographic DT is larger than observed in micro-CT at 3 and 9 mm, and the classification differed in each root level. The classification at 9 mm is indicated.


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