What factors affect the severity of permanent tooth impaction?

BMC Oral Health

Table 2 Severity of permanent tooth impaction in the vertical, horizontal, and angular positions in relation to different grouping factors. (younger age group = 15-25 yr., older age group = 25.1-40 yr., Mx2 = maxillary lateral incisor, V = vertical, H = horizontal, A = angle of impaction)

Impacted tooth under investigation	Impaction position	Factors assessed in relation to the severity of impaction using Wilcoxon-Mann-Whitney test (P value)
		Age			Gender			Tooth agenesis			Microdontia of Mx2			Retained deciduous
		Younger Mean rank	Older Mean rank	P value	Male Mean rank	Female Mean rank	P value	Yes Mean rank	No Mean rank	P value	Yes Mean rank	No Mean rank	P value	Yes Mean rank	No Mean rank	P value
Maxillary canine (n = 137)	V	63.4	67.4	0.494	65.8	64.3	0.804	69.6	64.3	0.550	67.2	64.6	0.737	65.3	64.7	0.921
	H	64.2	76.1	0.080	57.9	79.0	0.001*	62.2	70.0	0.443	76.4	67.7	0.344	68.1	69.9	0.792
	A	62.5	78.7	0.012*	59.0	78.0	0.003*	62.6	69.9	0.451	71.3	68.6	0.759	66.0	72.1	0.333
Mandibular 2nd premolar (n = 84)	V	32.8	34.7	0.531	33.7	33.3	0.896	36.0	33.3	0.574	36.0	33.1	0.453	29.6	35.9	0.030*
	H	43.4	40.5	0.553	44.4	40.9	0.437	28.1	44.0	0.041*	55.1	40.4	0.024*	42.3	42.6	0.956
	A	40.3	47.1	0.057	42.6	42.4	0.937	36.0	43.2	0.207	53.1	40.7	0.010*	40.2	43.7	0.326
Maxillary 2nd premolar (n = 40)	V	16.7	16.0	0.765	16.7	16.4	0.890	14.7	17.2	0.309	20.5	15.8	0.127	14.6	19.0	0.054
	H	22.4	16.6	0.114	23.3	17.9	0.117	24.3	19.4	0.231	21.2	20.4	0.878	17.3	24.5	0.037*
	A	20.1	21.2	0.740	18.4	22.4	0.184	22.5	19.9	0.481	23.6	20.1	0.443	20.7	20.3	0.908
Mandibular canine (n = 24)	V	11.3	10.7	0.812	10.0	12.1	0.410	8.5	11.6	0.318	0	0	–	12.1	10.6	0.573
	H	13.4	11.0	0.394	12.8	12.2	0.831	10.9	12.8	0.594	0	0	–	16.4	11.2	0.097
	A	13.0	11.7	0.602	13.1	11.9	0.613	9.0	13.2	0.175	0	0	–	16.6	11.1	0.041*

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