To investigate the morphology of pulp chamber floors in mandibular second molars with a C-shaped canal system. N= 44 extracted second MD molars with C-shaped canal morphology in a Chinese population
- Teeth were scanned by Micro CT
- The most superior part of pulp chamber floor (line X) was used to analyze the shape of the pulpal floor and canal orifice. Fig 1
- The pulp chamber floors were reconstructed using 3-D software and classified into 4 types. Fig 2
- Canal configurations were classified into 5 types. Fig. 3
Most highlighted Results:
- 91% of the pulp chamber floors within 3 mm below the CEJ
- 86% had the C-shaped orifices. Not all teeth with the C-shaped canal had a C-shaped pulpal floor.
- In type II & type IV orifices were similar to those in mandibular 2nd molars with separated roots. There were no significant differences in canal configurations at the different levels.
- In type I &type III orifices, There were significant differences among canal configurations at different levels. Continuous C and MB-D canals, from the orifice to the coronal portion, basically retained their shape. In the middle and apical portions of the canal, changed to two canals.
Assist the clinician in the prediction and location of c-shaped canals below the visible orifice.
•Type I: continuous C-shaped orifice (18 %)
•Type II: dentin fusion between the peninsula-like floor and buccal pulp chamber wall, forming one or two mesial orifice(s) and a distal orifice (36%)
•Type III: dentin fusion between the peninsula-like floor and the mesial pulp chamber wall, forming a large mesiobuccal- distal (MB-D) orifice and a small mesiolingual orifice (31 %)
•Type IV: teeth did not have a C-shaped floor configuration (13 %)
C1: continuous C-shaped canal
C2: MB-D canal and an ML canal
C3a: M canal and a D canal
C3b: MB, an ML, and a D canal
C4: single round or oval canal