Comparison between Collagen and Lidocaine Intramuscular Injections in Terms of Their Efficiency in Decreasing Myofascial Pain within Masseter Muscles: A Randomized, Single-Blind Controlled Trial

Table 6

Changes in EMG mean values in Group I, Group II, and Group III after 14 days.

Visit	Group I (μV)	Group II (μV)	Group III (μV)
Pain side
Baseline	56.6	59.9	64.1
1st follow-up visit	32.6	42.4	60.2
2nd follow-up visit	23.7	36.4	55.2
EMG changes	−32.9	−23.5	−8.9
Percentage EMG changes	−59.2%	−39.3%	−14%
No pain side
Baseline	34.3	38.7	36.6
1st follow-up visit	34.6	39.2	34
2nd follow-up visit	35.2	37.7	36.5
EMG changes	+0.9	−1	−0.1
Percentage EMG changes	+2.6%	−2.5%	−0.3%