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C-shaped canal system in mandibular second molars: Part I--Anatomical features
Bing Fan1, Gary S P Cheung, Mingwen Fan
1Key Lab for Oral Biomedical Engineering of Ministry of Education, Endodontic Center, School & Hospital of Stomatology, Wuhan University, Wuhan, China.
Journal of Endodontics
|November 27, 2004
Summary
This study reveals that most mandibular second molars in the Chinese population exhibit a C-shaped root canal system, characterized by a specific groove-to-thickness ratio. Variations in canal shape along the root length were observed, with apical divisions noted in some cases.
Area of Science:
- Endodontics
- Dental Anatomy
- Micro-computed Tomography (microCT)
Background:
- C-shaped root canal systems present unique anatomical challenges in endodontic treatment.
- Understanding the prevalence and morphology of these systems is crucial for successful clinical outcomes.
Purpose of the Study:
- To investigate the anatomical characteristics of C-shaped root canal systems in mandibular second molars from a native Chinese population.
- To utilize micro-computed tomography (microCT) for detailed morphological analysis.
Main Methods:
- Fifty-eight extracted mandibular second molars with fused roots were analyzed using microCT.
- Measurements of groove depth and root thickness were taken at eleven levels.
- Canal shapes were classified using a modified Melton's method, and data were analyzed with the Kruskal-Wallis test.
Main Results:
- A high prevalence (93.1%) of C-shaped canal systems was found, with a mean groove-to-thickness ratio of 47.96%.
- Most orifices were located within 3 mm below the cementoenamel junction, often with an uninterrupted "C" configuration.
- Significant variation in cross-sectional shape was observed along the canal length, with apical divisions occurring in 17 canals.
Conclusions:
- Mandibular second molars in this population frequently present with C-shaped root canal systems.
- The groove-to-thickness ratio is a key indicator for identifying C-shaped canals.
- Canal morphology in the middle and apical thirds cannot be reliably predicted from the orifice shape alone.