Investigation of the effects of storage time on the dimensional accuracy of impression materials using cone beam computed tomography.
OBJECTIVE
The storage conditions of impressions affect the dimensional accuracy of the impression materials. The aim of the study was to assess the effects of storage time on dimensional accuracy of five different impression materials by cone beam computed tomography (CBCT).


METHODS
Polyether (Impregum), hydrocolloid (Hydrogum and Alginoplast), and silicone (Zetaflow and Honigum) impression materials were used for impressions taken from an acrylic master model. The impressions were poured and subjected to four different storage times: immediate use, and 1, 3, and 5 days of storage. Line 1 (between right and left first molar mesiobuccal cusp tips) and Line 2 (between right and left canine tips) were measured on a CBCT scanned model, and time dependent mean differences were analyzed by two-way univariate and Duncan's test (α=.05).


RESULTS
For Line 1, the total mean difference of Impregum and Hydrogum were statistically different from Alginoplast (P<.05), while Zetaflow and Honigum had smaller discrepancies. Alginoplast resulted in more difference than the other impressions (P<.05). For Line 2, the total mean difference of Impregum was statistically different from the other impressions. Significant differences were observed in Line 1 and Line 2 for the different storage periods (P<.05).


CONCLUSIONS
The dimensional accuracy of impression material is clinically acceptable if the impression material is stored in suitable conditions.
Department of Prosthodontics, Faculty of Dentistry, Recep Tayyip Erdogan University, Rize, Turkey.
Murat
0000-0001-9324-0158
M
Alkurt
Department of Prosthodontics, Faculty of Dentistry, Recep Tayyip Erdogan University, Rize, Turkey.
Zeynep
0000-0001-7162-8792
Z
Yeşıl Duymus
Department of Mouth, Tooth and Jaw Radiology, Faculty of Dentistry, Inönü University, Malatya, Turkey.
Numan
0000-0003-0892-3654
N
Dedeoglu
CBCT; Impression materials