Position of Orifice of Distobuccal Canal of Maxillary Second Molars Using Cone-Beam Computed Tomography

Figures & data

Table 1 Number and Percentage of Root Canals of Maxillary Second Molars

Root Canal Number	2	3	4	5	Total
Frequency	0	202	99	0	301
Percentage	0.0	67.1	32.9	0.0	100.0

Table 2 Mean, Standard Deviation, Minimum and Maximum Values of DM, DP in Millimeters and MDP in Degrees in Maxillary Second Molars (n=301)

Distance	Minimum (mm)	Maximum (mm)	Mean (mm)	Std. Deviation (mm)
DM	1.10	4.40	2.1831	0.63709
DP	1.20	6.20	3.8704	0.84944
MDP	80.40	144.50	106.37	12.12075

Table 3 DM (Distance Between the Distobuccal and Mesiobuccal Canal Orifices) Variations in Millimeters

DM	~1	~1.5	~2	~2.5	~3	~3.5	~4	~4.5	Total
Frequency	0	50	92	80	49	20	8	2	301
Percentage	0.0	16.6	30.6	26.6	16.3	6.6	2.7	0.7	100

Table 4 DP (Distance Between the Distobuccal and Palatal Canal Orifices) Variations in Millimeters

DP	~1	~1.5	~2	~2.5	~3	~3.5	~4	~4.5	~5	~5.5	~6	~6.5	Total
Frequency	0	3	6	13	18	56	81	53	52	11	7	1	301
Percentage	0.0	1	2	4.3	6	18.6	26.9	17.6	17.3	3.7	2.3	0.3	100

Table 5 Frequency Distribution of MDP Angle Variations (<90°, 90–120° and >120°)

MDP	Frequency	Percentage
<90°	22	7.3
90–120°	239	79.4
>120°	40	13.3
Total	301	100.0

Table 6 MDP (the Angle Formed by the Mesiobuccal, Distobuccal and Palatal Canal Orifices) Variability

MDP	80–90°	~100°	~110°	~120°	~130°	~140°	~150°	Total
Frequency	22	71	99	69	31	7	2	301
Percentage	7.3	23.6	32.9	22.9	10.3	2.3	0.7	100

Figure 1 Images of transverse section of the orifice in different cases. From left to right and from top to bottom: MDP<90° and MDP>140°. Blue values show distance between the orifices of distobuccal and mesiobuccal canals (DM), and distance between the orifices of distobuccal and palatal canals (DP). Green values show the angle between the orifices of mesiobuccal, distobuccal and palatal canals (MDP). Red values indicate the canal orifices of four-canal maxillary second molars.