Progress in Orthodontics

Table 3 Correlation of the root resorption of second molars according to the stage of eruption of the lower M3 positions at T1

From: Correlational study of impacted and non-functional lower third molar position with occurrence of pathologies

	Resorption—2nd molars
Variable	Present		Absent		Total		p value
	n	%	n	%	n	%
• Stage of eruption
Erupted	–	–	8	100.0	8	100.0	p ^a = 0.005*
Partial erupted	–	–	14	100.0	14	100.0
Full bone impacted	10	37.0	17	63.0	27	100.0
Total	10	20.4	39	79.6	49	100.0
• Pell and Gregory—T1
IA	–	–	17	100.0	17	100.0	p ^a = 0.024*
IIA	3	30.0	7	70.0	10	100.0
IB	3	37.5	5	62.5	8	100.0
IIB	1	11.1	8	88.9	9	100.0
• Winter—T1
Horizontal	5	55.6	4	44.4	9	100.0	p ^a < 0.001*
Mesioangular	5	38.5	8	61.5	13	100.0
Vertical	–	–	20	100.0	20	100.0
Group total	10	20.4	39	79.6	49	100.0

Obs.: Relative risk was not determined due to the occurrence of zero or very low frequencies
n number of teeth
*Significant difference at 5 %
^aFisher’s exact test

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