Table 2. The assessment methods for facial swelling, restriction of mouth opening, and pain.

Variability	Methods	Unit	Article following
Facial swelling (Fig. 2)	(A): Lateral canthus of the eye to the gonion angle.	millimeters	Schultze-Mosgau et al. [22] and Antunes et al. [9]
	(B): Tragus to the commissure of the mouth.
	(C): Tragus to the soft tissue pogonion.
Limitation of mouth opening	The maximum mouth opening taken from the distance between the upper and lower incisal edges of central incisors	millimeters	Schultze-Mosgau et al. [22] and Antunes et al. [9] and Boonsiriseth [4]
Pain evaluation
Visual analog scale (VAS)	The horizontal 100-mm long line starting from 0 on the left-end as “no pain” and 100 on the other right-end as the “worst pain” measured on the day of operation, 2nd and 7th postoperativedays	millimeters	Katz & Melzack [23] and Sirintawat [24]
Interpretation from VAS to the numeric rating scale (NRS)	no pain (0-4 mm),	number	Jensen et al. [25] and Boonsiriseth [4] and Sirintawat [24]
	mild pain (5-44 mm),
	moderate pain (45-74 mm)
	severe pain (75-100 mm)
The number of analgesic tablets	The analgesic tablets taken was recorded each day for 7 days postoperatively	Number of tablets	Boonsiriseth [4]