Internal Morphological Variations of 150 Lower Premolars: Three-Dimensional Multianalytical Study

Figures & data

Figure 1. Root canal configurations by micro ct observed in mandibular premolars.

Figure 2. Vertucci’s classification by micro ct observed in mandibular premolars.

Table 1. Vertucci classification and ramifications of the root canal morphology of mandibular premolars evaluated by micro-computed tomography.

		Sample (n)	Frequency (%)
Vertucci Classification	Type I	101	67.3
	Type II	1	0.7
	Type III	15	10.0
	Type IV	4	2.7
	Type V	25	16.7
	Type VII	2	1.3
	Not classifiable	2	1.3
	Total	150	100.0
Ramifications	NO	101	67.3
	Secondary canals	22	14.7
	Apical delta	7	4.7
	Lateral canals	12	8.0
	Lateral canal and secondary canal	8	5.3

Figure 3. Anatomical variations and ramifications of mandibular premolars using micro-ct. (a).Lateral canal. (b). Secondary canal. (c). Apical delta. (d). Intercanal.

Table 2. Data from parameters evaluated at total and 5 mm from the apical foramen of mandibular premolars evaluated by micro-computed tomography.

Parameters	Mean (SD)	Range
Total length (mm)	12.63 (2.20)	4,86
Total volume (mm3)	7.64 (5.68)	32.33
Apical area (5mm) (mm2)	10.57 (4.33)	18.76
Apical volume (5mm) (mm3)	0.89 (1.34)	1.80
Apical diameter (mm)	1.68 (0.72)	0.52