The alpha moment produces distal root movement of the anterior teeth, while the beta moment produces mesial root movement of the posterior teeth. By varying the magnitude of these moments , if the alpha and beta moments are unequal, vertical forces are also generated. If the beta moment is greater than the alpha moment, anchorage is enhanced by the mesial root movement of the posterior segment, and there is a net intrusive force on the ante rior teeth. If the alpha moment is greater, the anchorage of the anterior segment is increased, and there is a net extrusive force on the anterior segment. If the alpha and beta moments are equal in magnitude, no vertical forces are generated.
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