The accuracy of gypsum casts obtained from the disinfected extended-pour alginate impressions through prolonged storage times

The accuracy of gypsum casts obtained from the disinfected extended-pour alginate impressions through prolonged storage times

Background Manufacturers of the extended-pour alginates claimed their dimensional stability through prolonged storage. No data confirmed the ability of these materials to maintain their dimensions and the reproduced oral details following their chemical disinfection. Therefore, this study evaluated...

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Published in:BMC oral health Vol. 21; no. 1; pp. 1 - 296
Main Authors: Sharif, Rania A, Abdelaziz, Khalid M, Alshahrani, Najla M, Almutairi, Fatimah S, Alaseri, Mohrah A, Abouzeid, Hoda L, Elagib, Mohamed F. A
Format: Journal Article
Language:English
Published: London BioMed Central Ltd 09-06-2021
BioMed Central
BMC
Subjects:
Accuracy
Alginate
Alginic acid
Chemical properties
Dental materials
Dental matrices
Dentistry
Detail reproduction
Dimensional stability
Disinfection
Disinfection & disinfectants
Disinfection and disinfectants
Drinking water
Gypsum
Gypsum cast
Immersion
Kruskal-Wallis test
Laboratories
Mechanical properties
Methods
Microorganisms
Plastics
Shelf life
Sodium hypochlorite
Storage
Saudi Arabia
Brazil
Italy
Rio de Janeiro Brazil
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Summary:Background Manufacturers of the extended-pour alginates claimed their dimensional stability through prolonged storage. No data confirmed the ability of these materials to maintain their dimensions and the reproduced oral details following their chemical disinfection. Therefore, this study evaluated the dimensional stability and surface detail reproduction of gypsum casts obtained from disinfected extended-pour alginate impressions through different storage time intervals. Methods Two hundred and forty three hydrocolloid impressions were made from one conventional (Tropicalgin) and two extended-pour (Hydrogum 5 and Chromaprint premium) alginates. These impressions were subjected to none, spray and immersion disinfection before their storage in 100% humidity for 0, 72 and 120 h. The dimensional stability and the surface detail reproduction were indirectly evaluated under low angle illumination on the resulted gypsum casts. At [alpha] = 0.05, the parametric dimensional stability data were analyzed using One-Way ANOVA and Tukey's comparisons, while the nonparametric detail reproduction data were analyzed using KrusKal Wallis and Mann-Whitney's tests. Results All gypsum casts exhibited a degree of expansion; however, the recorded expansion values did not differ between test categories (P > 0.05). Generally, casts obtained from spray-disinfected impressions showed lower detail accuracy (P < 0.05). Immersion-disinfected extended-pour alginates produced casts with better detail accuracy following 120 h of storage (P < 0.05). Conclusion All alginates materials offer comparable cast dimensions under different testing circumstances. Extended-pour alginates offer casts with superior surface details following their immersion disinfection and 120 h of storage. Spray-disinfection using 5.25% sodium hypochlorite affects the surface details of casts obtained from conventional and extended-pour alginates adversely. Keywords: Alginate, Disinfection, Detail reproduction, Dimensional stability, Gypsum cast, Storage, Extended-pour
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ISSN:1472-6831
1472-6831
DOI:10.1186/s12903-021-01649-2