Accuracy Comparison of Impression by Alginate Materials between Conventional and New Methods (Injection)—an In-vitro Study

Purpose: In this research, we used a new technique (injection) to improve the accuracy of recording the surface details of alginate impression material. This research aims to compare the new method (injection) accuracy with the conventional method using alginate impression material. Material and Method: In this in vitro study, the Typodont Tooth model of the Maxillary Arch was used. The second molar tooth was prepared from the second quadrant of the maxillary arch model, and ten points were identified for examination with an extra-oral laboratory 3D scanner. Poly Works, SPSS, and EXO CAD software were used for analysis and comparison. Results: Among the ten reference points used on the trimmed teeth after impression, casting, and scanning, the casts made by the new method contain the most recorded points, with the highest accuracy in recording details. By using Poly-Works software, the degree of matching of the scanned plaster casts with the original model was compared, and the highest match was related to casts number 1, 2, and 3 (injection) and cast No. 4, 5, and 6 (conventional) had the minor match. Conclusion: Based on the results obtained from this study, the injection technique was more accurate than the traditional technique.