Table 4. Descriptive statistics of root intrusion for first and second maxillary molars mesiobuccal root apex-to-sinus (MBR), distobuccal root apex-to-sinus (DBR), palatal root apex-to-sinus (PR) distances .

		With Intrusion				Without Intrusion
Tooth		Percentage	Min	Max	Mean (±SD)	Percentage	Min	Max	Mean (±SD)
First Maxillary Molars	MBR	20.18	–5.59	–0.31	–1.81(1.37)	79.82	0.21	17.3	5.15(3.93)
	DBR	24.51	4.20	–0.11	–1.87(1.48)	75.49	0.23	16.11	4.89 (3.85)
	PR	28.85	–5.68	–0.14	–1.61(1.4)	71.15	0.18	17.42	5.37(3.81)
Second Maxillary Molars	MBR	37.65	–5.56	–0.19	–1.61(1.09)	63.35	0.11	16.02	3.13(3.26)
	DBR	20.48	–3.90	–0.22	–1.84(1.21)	79.52	0.05	14.41	3.85(2.91)
	PR	22.89	–4.57	–0.14	–1.37(1.17)	77.11	0.04	14.58	4.02(3.13)