Abstract
Aim: The aim of this study was to evaluate the fit of single copings fabricated from addition silicone and new generation alginate impression materials by comparing their marginal fit and internal adaptation using a 2D digital analysis method. Materials and Methodology: A maxillary second molar (Nissin typodont) was prepared and impressions were made using four different impression materials: CAVEX crème alginate, extended pour Alginate (Hydrogum5) with immediate pouring (EPI), extended pour Alginate with delayed pouring for one hour (EPD), and addition silicone (President, Coltene). Wax patterns were fabricated on stone dies and copings were cast. The copings were analysed for marginal and internal fit using a 2D digital analysis. One-way ANOVA with post hoc analysis was used to compare the mean marginal gap and internal fit among the groups Results: The study found that the mean marginal gap was 0.17 mm for the EPI group, 0.23 mm for the CAVEX crème alginate group (Group C), 0.20 mm for the EPD group, and 0.30 mm for the addition silicone group (Group PVS). Post hoc analysis revealed a significant difference in marginal fit between the EPI and PVS groups (p=0.03), indicating superior marginal fit in the EPI group. However, there was no statistically significant difference in internal fit among the groups. Conclusion: These results suggest that extended pour alginate materials, particularly when poured immediately, offer better marginal fit compared to addition silicone for single-tooth impressions. The internal fit was comparable across all materials tested. Clinical significance: Extended pour alginates can be used for fabricating a single coping due to their longer working time and flexibility in the impression process.
Published Version
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