Table 2.

Characteristics of the selected studies

Study	Sample size	Treatment design	Age	Sex	Type of treatment	Criteria of study
Zhao et al [9]	48	24 patients (test)	12.8±1.88	36 F	RPE	CBCT before and after the treatment
		24 patients (control)	12.8±1.85	12 M
Iwasaki et al [10]	48	28 patients (test)	9.96±1.21	27 F	RPE	CBCT before and after the treatment
		20 patients (control)	9.68±1.02	21 M
Chang et al [3]	14	14 patients (test)	12.9	9 F	RME	CBCT before and after the treatment
		0 patients (control)		5 M
Ribeiro et al [4]	15	15 patients (test)	7.5 years	8 F	RPE	CBCT before and after the treatment
		0 patients (control)		7 M
El et al [11]	70	35 patients (test)	14.02±1.46	30 F	RPE	CBCT before and after the treatment
		35 patients (control)	14.10±1.44	40 M