Table 1.

Summary of nonsyndromic comprehensive studies of supernumerary teeth in the premolar region.

Authors	Year	Country	Sample	No. of cases	No. of teeth	Prevalence %	Maxilla	Mandible
Stafne [1]	1932	USA	48,550	NR∗	42	0.084	9	33
Grahnen and Lindhal [5]	1961	Sweden	1,052	3	6	0.29	0	6
Zvolanek and Spotts [6]	1985	USA	4,000	6	7	0.15	0	7
Rubenstein et al. [7]	1991	USA	1,100	7	16	0.64	3	13
Kaya et al. [8]	2011	Turkey	8400	10	20	0.24	1	19
Arikan et al. [9]	2013	Turkey	7,551	13	13	0.17	0	13

^∗NR = not reported.