Abstract
This study aimed to assess the dimensional accuracy of five commercial alginates verified in stone casts. Methods: Each alginate impression (Cavex ColorChange, Cavex Holland BV; Jeltrate Plus, Dentsply; Hydrogum, Zhermack; Kromopan 100, Lascod; Ezact Kromm, Vigodent) was performed on partially edentulous standard stainless steel mandibular arch cast with reference points on teeth 33, 43, 37 and 47. On the stainless steel cast, the anteroposterior (33-37 and 43-47) and transverse (33-43 and 37-47) distances were measured in a stereomicroscope at 30x magnification and 0.5 μm accuracy. The distances between these points were measured three times, obtaining an average, which was analyzed statistically and compared with the distances obtained from the stone casts. For each alginate the casts were poured gypsum (n = 5) immediately and after a period of 1, 2, 3 and 5 days of the impression procedure. Results: The dimensional accuracy values of stone and stainless steel casts were analyzed statistically by two-way ANOVA and Tukey's test (α=0.05). The results showed significant differences between the alginates; however, no differences in dimensional accuracy were found among the different storage times of alginate impression. Conclusions: It can be concluded that the alginate impressions can be stored for up to 5 days.
Highlights
Impression materials are used in Dentistry to create accurate casts of buccal tissues for pre-treatment planning, fabrication of prostheses, and post-treatment records
For both transverse distances all alginates impressions showed stone casts with expansion and similar dimensional alteration, except for 37-47 distance poured immediately and after 1 day, where HY presented the highest means of dimensional alteration and for 33-43 distance poured all periods of time, where JT showed the lowest means of dimensional alteration (p
Anatomical dental stone casts, which accurately reproduce the shape of the teeth and adjacent buccal tissues, are used for many diagnostic and treatment purposes in Dentistry
Summary
Impression materials are used in Dentistry to create accurate casts of buccal tissues for pre-treatment planning, fabrication of prostheses, and post-treatment records. They can be classified in inelastic or elastic materials, which return to their initial form after be removed from mouth due to elastic recovery, and according to chemical reaction (irreversible or reversible). The alginate (irreversible hydrocolloid) is an impression material that appeared in Dentistry on ‘40s, when the agar supplies (reversible hydrocolloid) became insufficient due to the World War II. Alginate is an impression material widely used in in Dentistry and its popularity is due to the easy manipulation, low cost, and its hydrophilicity[1].
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