Table 4.

Distribution of microdontia, delayed eruption/impacted tooth, and tooth with dilacerated root according to the Parry–Romberg syndrome (PRS) severity index

PRS severity index	Patient	Affected side	Microdontia			Delayed eruption/impacted tooth			Tooth with dilacerated root		Match with side involvement
			Existence	Number		Existence	Number		Existence	Number
Mild	#1	Right	×			×			○ (#43)	1	○
	#4	Right	×			×			×
	#8	Left	○ (#24,26)	2		○ (#24)	1		×		○
Moderate	#3	Left	○ (#23,26)	2		×			×		○
	#5	Right	○ (#13,14,16,17,44,45)	6		×			×		○
Severe	#2	Right	×			○ (#13,17)	2		×		○
	#6	Right	○ (#13,15)	2		×			×		○
	#7	Left	×			×			○ (#22)	1	○
	#9	Left	×			×			×
	#10	Left	×			×			×
			n = 4 (40%)			n = 2 (20%)			n = 2 (20%)		n = 7/7 (100%)

Mild, Total score < 140; Moderate, total score between 140 and 170; Severe, total score ≥ 180.