Evaluation of Pull-out Resistance of the Novel Alginate Impression Material

Objectives: Aroma Injection (ARI), we have newly developed and released in Japan is a paste-type alginate impression material in an automix cartridge. It is the world’s first product developed as alginate-based wash material for combined impression and optimized in terms of physical properties such as consistency and tear strength. Combined with conventional alginate base material, it is possible to take precise impressions and expand the range of alginate impression material usage. For instance, we expect this soft alginate-based material to be more comfortable for use to mobile teeth than other hard impression materials such as silicone. Therefore, the aim of this study was to evaluate use suitability for combined impression of mobile teeth by measuring the pull-out resistance of ARI from the tooth model and comparing with other impression materials.
Methods: ARI combined with Aroma Fine Plus Normal Set (ARI, GC, JP), Hydrogum5 (HYG, Zhermack, IT), AlgiNot (ALN, Kerr, US), Imprint4 Light combined with Heavy (IMP, 3M, DE) and Aquasil Ultra LV combined with Heavy (AQU, Dentsply Sirona, US), were used. The pull-out resistance was measured by the following methods. Each material was mixed (n=5), put on the tooth model, incubated (35°C), tested (50mm/min) and analyzed (Tukey-Kramer test, p<0.01). The measurement was conducted with the universal testing machine (EZ-L, SHIMADZU, JP).
Results: The evaluation showed that the resistance of ARI and HYG was significantly lower than ALN, IMP and AQU. The resistance of ARI was similar to HYG.
Conclusions: ARI has similar pull-out resistance with conventional alginate impression materials rather than silicone impression materials and has enough softness. Moreover, ARI can be used for combined impression because of its more optimized physical properties. Therefore, ARI is expected to be useful for taking precise impression of dentition including mobile teeth.