Table 2.

Differences in VRS data and need for additional injections between experimental and control groups

	Injection technique		P-value
	PDLa (n=55), n (%)	Infiltrationb (n=55), n (%)
VRS
Pain during extraction
Less than expected	0	8 (14.5)	0.003*
As expected	33 (60)	36 (65.5)
More than expected	22 (40)	11 (20)
Acceptability of extraction pain
Acceptable	20 (36.4)	44 (80)	<0.001**
Unacceptable	35 (63.6)	11 (20)
Need for additional injection(s)
Yes	16 (29.1)	6 (10.9)	0.03**
No	39 (70.9)	49 (89.1)

Notes:

^aExperimental;

^bcontrol;

^*χ² test;

^**Fisher’s exact test.

Abbreviations: VRS, visual response scale; PDL, periodontal ligament.