Do Ultraconservative Access Cavities Hinder Endodontic Reintervention in Mandibular Incisors? A Laboratory Investigation

Table 2

Student’s t-test for the experimental groups.

Student’s t-test
	Levene test for equality of variances		t-test for equality of means
	F	Sig.	t	df	Sig. (extremities)	Mean difference	Standard error of difference	95% confidence interval of difference
								Inferior	Superior
Equal variances assumed	0.813	0.377	0.499	21	0.623	2.99633	6.00594	−9.49371	15.48637
Equal variances not assumed			0.502	20.981	0.621	2.99633	5.97293	−9.42575	15.41841