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Images of the four panoramic machines (a) Orthopantomograph® OP200 (Instrumentarium Dental, Tuusula, Finland), (b) Orthophos CD (Sirona Dental Systems GmbH, Bensheim, Germany), (c) Orthophos XG Plus (Sirona Dental Systems GmbH) and (d) ProMax® (Planmeca Oy, Helsinki, Finland)
