Table 4.

Distances between the root apex and the maxillary sinus floor on different sides.

Tooth	Side	N	Sagittal				Coronal
			Mean ± SD	Min	Max	P value	Mean ± SD	Min	Max	P value
16 and 26
MB	R	117	1.81 ± 3.10	−4.08	13.43	0.24	2.44 ± 3.75	−3.10	16.06	0.13
	L	117	2.03 ± 3.43	−4.08	13.43		2.82 ± 4.20	−3.17	13.96
DB	R	117	1.93 ± 3.09	−2.81	13.53	0.53	2.40 ± 3.52	−4.12	18.11	0.31
	L	117	2.04 ± 3.42	−2.16	14.24		2.62 ± 3.68	−2.89	16.01
P	R	117	2.23 ± 3.76	−4.07	14.88	0.58	2.28 ± 3.54	−4.03	12.69	0.41
	L	117	2.40 ± 3.98	−3.70	13.44		2.49 ± 3.61	−2.75	13.11
17 and 27
MB	R	116	0.90 ± 2.48	−3.29	10.13	0.63	1.07 ± 2.53	−2.46	9.56	0.93
	L	116	0.97 ± 2.70	−3.54	13.15		1.06 ± 2.60	−4.18	13.02
DB	R	116	1.26 ± 2.60	−2.37	12.91	0.46	1.53 ± 2.69	−2.06	12.40	0.48
	L	116	1.39 ± 2.99	−3.54	13.15		1.67 ± 3.14	−4.18	13.02
P	R	116	2.54 ± 3.28	−2.55	16.97	0.49	2.85 ± 3.36	−2.65	16.02	0.63
	L	116	2.36 ± 3.54	−3.54	13.73		2.72 ± 3.46	−2.45	13.02

Distances are shown in mm.

Abbreviations: MB, mesiobuccal root; DB, distobuccal root; P, palatal root; N, number; SD, standard deviation; Min, minimum; Max, maximum.