study of clasp designs for asymmetric distal extension partial dentures

The clasp design in distal extension removable partial dentures [RPD] plays an important role in the distribution of load between the abutment teeth and the edentulous ridge. This study was assigned to evaluate clinically and radiographically the effect of the Budtz-Jorgensen and Bochet, Equipoise and RPA clasp designs in mandibular distal extension RPD on the abutment teeth supporting structures. Fifteen partially edentulous patients [asymmetric Kennedy class I] were divided into three groups [five each]. Each group received RPD with one of the three clasps. The Plaque Index, Gingival Index, attachment loss, bone height and tooth mobility were recorded at denture insertion and after 3,6,9 and 12 months. The Budtz-Jorgensen and Bochet clasp showed no change in the supporting structures throughout the 12 months. The Equipoise clasp and the RPA clasp showed significant Plaque accumulation and gingival inflammation after 9 and 12 months. In addition, the RPA clasp showed a significant increase in attachment loss and alveolar bone loss after 12 months. However, there was no tooth mobility in the three groups throughout the follow-up period

Magnetic resonance imaging: an aid to staging primary oral cancer

The objective of the present study was to elucidate the value of magnetic resonance imaging MRI in preoperative tumor T staging oral cancer [27cases]. Superconductive 1.5 tesla magnetic units were used to obtain T1-, T2-, and proton-density-weighted image sequences. The MRI findings were compared to preoperative clinical and postoperative histopathologic ones. Data analysis demonstrated a higher performance of MRI in preoperative presentation of tumor size as compared to the clinical evaluation. T2-weighted image offered a slightly better tumor presentation than the other two images sequences. In conclusion, MRI could be a reliable diagnostic tool to aid in preoperative clinical size determination of primary oral cancer and in this regard, T2-weighted image might be relatively more accurate than T1- and proton-density-weighted images