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Schneider RL. J Prosthet Dent 1987;58:194-6.
1: according to Schneider, the angle of gingival convergence is located apical to the height of contour on the abutment tooth. It can be identified by viewing the angle formed by the tooth surface gingival to the survey line and the analyzing rod or undercut gauge in a surveyor as it contacts the height of contour 2: the angle formed by any surface of the tooth below the survey line of the height of contour, with the selected path of insertion of a prosthesis 3: the angle formed by the tooth surface below the height of contour with the vertical plane, when the occlusal surface of the tooth is oriented parallel to the horizontal plane