Dimensional Stability of Impression Materials Disinfected by COEfect™ MinuteSpray

Objectives: Objectives: To determine the effect of commercially available disinfectant solutions on the dimensional stability of two types of impression materials available to clinicians: dental alginate and polyvinyl siloxane impression materials.
Methods: Methods: This is in vitro study involved a 2 x 5 factorial design (n=5). The factors under evaluation were: -Impression materials at two levels: (1) dental alginate and (2) polyvinyl siloxane impression materials. -One-step spray antimicrobial disinfectants at five levels:
(1)Distilled water; (2) BirexSE®; (3) Opti-Cide3®; (4) COEfect™ MinuteSpray (5) CaviCide Spray. All the dental alginate and polyvinyl siloxane (PVS) impression materials have been submitted to spray disinfection. For dimensional stability, impressions of maxillary complete edentulous template were scanned after impression-taking with a CBCT scanner. After fabrication of a digital model, linear measurements were made on the digital models in the A-B, A-C and B-C dimensions. For assessment of surface alterations of dental alginate and polyvinyl siloxane impression materials caused by spray antimicrobial disinfectants, a representative specimen of each group has been subjected to SEM preparation and examination.
Results: Results: Mean, and standard deviation of dimensional differences by dental alginate was subjected and passed the Normality (Kolmogorov-Smirnov) and equal variance tests (P=0.22 and 0.48, respectively). The variance analysis did not demonstrate significant differences between the disinfectant solutions on the dimensional stability of the tested alginate (p=0.489). In all groups, alginates impressions shrank over the hour of measurement, indicating the transfer of water from the alginate into the external water or disinfecting solution. For PVS materials, the variance analysis did not demonstrate significant differences between the disinfectant solutions on the dimensional stability of the tested alginate (p=0.514) as shown in Figure 6.
Conclusions: Conclusions: Disinfection of the impressions by the tested commercially available disinfectant solutions did not yield significant linear dimensional changes in dimensions of the used dental alginate and polyvinyl siloxane impression material.