International Journal of Medical and Health Research

Aims: Many materials and methods have been documented to produce dies as accurate as the abutment preparations in the oral cavity in order to generate precisely fitting indirect dental restorations without marginal and occlusal discrepancy.

Materials and Methods: The master model consisted of a dentate mandibular arch of an acrylic resin typodont (Columbia Dentoform Corp., Long Island City, USA) with second right premolar prepared to receive porcelain fused metal crown. The sharp notches are prepared on the buccal and lingual cusp tips of the abutment and at the mid facio-gingival margin with round bur. The master model abutment width and height are then measured by travelling microscope from buccal to lingual cusp tip notch and buccal cusp tip notch to mid facio-gingival margin notch respectively. The master model consisted of a dentate mandibular arch of an acrylic resin typodont (Columbia Dentoform Corp., Long Island City, USA) with second right premolar prepared to receive porcelain fused metal crown. The sharp notches are prepared on the buccal and lingual cusp tips of the abutment and at the mid facio-gingival margin with round bur. The master model abutment width and height are then measured by travelling microscope from buccal to lingual cusp tip notch and buccal cusp tip notch to mid facio-gingival margin notch respectively.

Results: The average height of the abutment on the group I, and II stone casts are 5.656 mm, and 5.5.739mm with standard deviation of 0.103 and 0.0344 respectively. Abutment height on group I, and II stone casts deviated from that of master model by -1.7% and -0.24% respectively. The abutment height measurements when subjected to one way ANOVA, p-Value was 0.025 that is significant at p <0.05. The mean width of the abutment on the group I, and II stone casts are 4.356mm and 4.296mm with standard deviation of 0.083 and 0.087 respectively. Abutment width on group I and II stone casts deviated from that of master model by 2.3% and 0.91% respectively. The abutment width values when subjected to one way ANOVA, p-Value was 0.13 which is highly insignificant at p<0.05.

Conclusion: Within the limitations of the study, it can be concluded that addition silicone produces more accurate dies as compared to condensation silicone.