Incidence and Anatomical Properties of Retromolar Canal in an Iranian Population: A Cone-Beam Computed Tomography Study

Table 4

Distance of different types of retromolar canal to third and second molars and mandibular canal.

	Canal type		Dist. to 3rd molar	Dist. to 2nd molar	Dist. to mand. canal
Type Ia	Frequency	Valid missing	4	4	10
			6	6	0
	Mean		5.425	12.225	11.780
	Std. dev.		2.7183	3.7393	1.5490
	Min		2.6	7.7	8.9
	Max		9.1	16.7	13.6
Type Ib	Frequency	Valid missing	2	6	15
			14	10	1
	Mean		10.500	14.450	14.467
	Std. dev.		1.2728	2.9126	3.2412
	Min		9.6	11.6	9.8
	Max		11.4	19.2	21.9
Type II	Frequency	Valid missing	17	18	27
			12	11	2
	Mean		7.376	16.300	13.956
	Std. dev.		1.8919	2.4217	2.6933
	Min		4.0	12.5	9.5
	Max		10.8	21.4	20.4
value			0.028	0.029	0.048