RPD Review Questions

Answer to Question #199


The correct answer is

Generally, lingual I-bars on lower molars should be placed at the mesiolingual corner of the abutment. This helps prevent the approach portion of the arm from standing out in the floor of the mouth and irritating the tongue. Will this arm work? Probably. There is very little tooth or tissue undercut so the arm may not stand out in the floor of the mouth even though it is positioned further posteriorly than would usually be desired.