The Effect of Pouring Time on Dimensional Accuracy of Polyvinyl Siloxane Impression Materials

İngilizce (OpenAlex)

Objective: The aim of this study was to evaluate of the dimensional accuracy of Polyvinylsiloxane (PVS) impression materials (Spirias, Imicryl, Konya, Turkey and Variotime, Heraeus, Hanau, Germany) by using stone models after different pouring time (1 hour and 24 hours). Methods: A standard maxillary dentulous acrylic model was selected as master model. Two linear measurements were selected on each sample for the evaluation of the models (x: 13-23 distance, y: 13-26 distance). A total of 40 samples were divided into 4 groups according to the impression brands and pouring time (n=10). All of measurements were made with CEREC SW 4.2.3 software (Sirona Dental System, GmbH, Bensheim, Germany) using “distance” tools of the programme. Statistical analysis was performed by using the IBM SPSS Statistics, Version 25 (IBM SPSS Statistics for Windows, IBM Corporation, Armonk, NY). A value of p<0.05 was considered statistically significant. Results: The relationship between different pouring times (1 hour and 24 hours) was not statistically significant (p>0.05). When the paired relations with the master model are evaluated, t test and p values show that there is statistically significant difference (p<0.05). Conclusion: When compared with the main model, PVS materials for both brands show dimensional distortion. For PVS impression materials, the pouring of the impressions does not make any difference.