Table 1.

Exposure parameters of the four panoramic machines

Machine	Image receptor	Exposure time (s)	Tube voltage (kVp)	Tube current (mA)
Orthopantomograph® OP200	PSP	17.6	66	10
Orthophos CD	PSP	13.9	71	15
Orthophos XG plus	CCD	14.1	69	15
ProMax®	CCD	16.0	66	12

CCD, charge-coupled device; PSP, phosphor storage plate.

Orthopantomograph OP200 is manufactured by Instrumentarium Dental, Tuusula, Finland; Orthophos CD by Sirona Dental Systems GmbH, Bensheim, Germany; Orthophos XG plus by Sirona Dental Systems GmbH; and ProMax by Planmeca Oy, Helsinki, Finland.