Table 2.

Acceptable and unacceptable root fillings according to academic year of students

Academic year	Total RF	Acceptable RF	Unacceptable RF*
			Under filled		Over filled		Density problem
4th	311	173 (55.6%) a, b	13 (4.2%)	42 (13.5%)		110 (35.4%)
5th	536	247 (46.1%) c	69 (12.9%)	60 (11.2%)		217 (40.4%)
6th	827	486 (58.8%)	57 (6.9%)	82 (9.9%)		253 (30.1%)
Total	1674	906 (54.1%)	139 (8.3%)	184 (11%)		580 (34.6%)

^* (RF = Root Filling);

^a Significant difference (P=0.007) between root fillings performed by fourth- and fifth-year students;

^b No significant difference (P=0.339) between root fillings performed by fourth- and sixth-year students;

^c Significant difference (P<0.001) between root fillings performed by fifth- and sixth-year students