Studies on post and core for abutments without sufficient coronal tooth structure

Abstract

In order to effectively restore the teeth which lost their supragingival tooth structure, 1) the difference in the two types of core and dowel: cast dowels and prefabricated post with composite resin, 2) the effectiveness of different cements: zinc phosphate cement, adhesive resin cement without and with 2 types of acid treatment, and 3) the effectiveness of retentive pins were observed in this study. Full coverage cast crowns were made and cemented with zinc phosphate cement to each sample. Compressive force of 10 kg was applied 1, 000 times against the lingual surface of each sample, while the junction of the crown and tooth was saturated with India ink. Later, the degree of filtration of the ink was examined.Results: When both fabricating methods were compared, a smaller filtration was observed in the case of cast post and core. For the cementing method, the use of adhesive resin cement with phosphoric acid treatment showed the smallest filtration. The pins also showed effectiveness.From this experiment, cast dowels cemented with adhesive resin cement after etching with 40% phosphoric acid showed the best results as the core preceding the final full coverage restorations for the teeth that have lost their coronal structure.