Abstract
Abstract Introduction A successful dental prosthesis is entirely dependent on the precision of various steps advocated during its fabrication. Of all these steps, impression-making is considered as the most critical step. Despite a multitude of studies that have been conducted in the recent past, the dilemma still persists about the most accurate impression technique in fabrication of fixed prostheses. The purpose of the study is to assess and compare the dimensional accuracy of one-step putty/light-body impression technique, two-step injection impression technique, and two-step putty/light-body impression technique with different thickness of spacers. Materials and Methods A total of five groups, that is, Group I (one-step putty light body), Group II (two-step injection), Group III (two-step putty light body with 0.5 mm of spacer), Group IV (two-step putty light body with 1.0 mm of spacer), and Group V (two-step putty light body with 1.5 mm of spacer) having 20 samples each were selected. A metallic master model simulating two full crown tapered preparations was fabricated. Metallic copings of 0.5, 1.0, and 1.5 mm thickness were fabricated using CAD-CAM to facilitate uniform thickness of the light body. Impressions were made with additional silicone impression materials. Results For the vertical height of the abutment all the groups evaluated showed a significant (P < 0.05) difference when compared to metallic master model. For the mesiodistal width of the abutment, all the groups showed a significant (P < 0.05) difference when compared to the metallic master model. For the inter-abutment distance, all the groups evaluated showed a significant (P < 0.05) difference when compared to the metallic master model. Conclusion Overall, two-step putty light body impression techniques with an adequate thickness of bulk showed better dimensional accuracy when compared to one-step putty light body and two-step injection impression techniques.
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