A maxillary photoelastic model was constructed to determine the retention and force transmission characteristics of a bilateral distal extension base partial denture. Comparisons were made using palatal and labial I-bars. It was shown that there were no significant differences in retention and force transmission between palatal and labial I-bars. From a stress and retention standpoint, it may be concluded that the use of palatal I-bars is a viable alternative to the labial I-bars, especially where aesthetics is of primary concern.
The retentive and stress characteristics of a magnetically retained partial overdenture were studied. The retentive properties were compared to those of an I-bar and Zest Anchor retained overdenture. The magnetically retained partial denture uniformly distributed stress to the supporting structures and exhibited significantly greater retention than that of the I-bar, but less than that of the Zest Anchor. Based on these observations, the magnetically retained denture should be considered as an option to be used instead of or in conjunction with other types of partial overdentures.
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