The Physical Properties of New Paste Type Alginate Impression Material
Objectives: Aroma Injection is a newly developed paste type alginate impression material for combination impressions. The purpose of this study was to evaluate the physical properties of Aroma Injection in vitro.
Methods: One alginate impression material; Aroma Injection (ARI; GC Co.), and three silicone base impression materials; Imprint 4 Light (3M Co.), Aquasil Ultra XLV, and Aquasil Ultra LV (Dentsply Sirona Co.) were used in this study. The consistency, detail reproduction, and Shore A0 hardness were measured according to the ISO 4823: 2015 and ISO 10139-1: 2018 introduction. Additionally, the surface wettability was determined using a portable contact angle meter (PCA-1; Kyowa Interface Science Co.). An auto pipetter and a goniometer were employed to ensure uniformity of the distilled water droplet volume (2 µl). Images were analyzed with FAMAS software at 10 sec and 120 sec after water dropped. All data were analyzed by ANOVA at a 0.05 level of significance.
Results: A significant difference was found among the materials in the consistency, contact angle, and Shore A0 hardness (p<0.05, ANOVA). The ARI was showed the highest value of consistency (55.5±3.2mm) and lowest value in Shore A0 hardness (31.6±2.6) than all silicone base impression materials. All materials reproduced line of 20μm. About the surface wettability, a significant difference was found among the different materials in the contact angle (p<0.05, ANOVA). The contact angle of ARI in the 10 sec (3.4±0.6°) and 120 sec (0°) was the lowest than all of the silicone base impression materials.
Conclusions: The results suggest that the Aroma Injection is useful as a precision impression material with good flowability and superior hydrophilic properties.