Do dental impression materials play a role in cross contamination?
OBJECTIVE
Dentists are required to institute infectious control procedures. Dental impression materials possessing antimicrobial properties may aid in reducing the risk of cross contamination since impression materials might play a role as carriers. The purpose of this study was to evaluate the antimicrobial properties of four impression materials.


METHODS
Four impression materials--Orthoprint, Impregum Penta, Aquasil Ultra Monophase, and Permlastic--were evaluated by the direct contact test. The materials were tested in contact with Enterococcus faecalis, Staphylococcus aureus, Staphylococcus epidermidis, and Candida albicans. The materials were mixed; allowed to set; and examined immediately and after aging for 24, 48, and 72 hours and 1 week. Two-way ANOVA, one-way ANOVA, and Tukey multiple comparison procedures were applied to the results.


RESULTS
Impregum Penta presented the broadest antibacterial spectrum of all the materials tested. There was a complete growth inhibition of S aureus and S epidermidis, and it sustained this ability for at least 7 days. It also showed an antifungal effect by partially inhibiting the growth of C albicans, a quality that was seen only immediately after setting. Aquasil Ultra showed an antifungal effect only immediately after setting. Permlastic showed a complete growth inhibition when in contact with C albicans and sustained this ability for at least 7 days. No significant antimicrobial properties were recorded for Orthoprint. When in contact with E faecalis, no significant antibacterial properties were recorded for any of the materials.


CONCLUSIONS
None of the tested materials exhibited a long-lasting or complete antibacterial and antifungal property. Therefore, disinfection of impressions is essential.
Department of Oral Rehabiliatation, The Maurice and Gabriella Goldschleger School of Dental Medicine, Tel Aviv University, Tel Aviv, Israel.
Shlomo
S
Matalon
Amir
A
Eini
Colin
C
Gorfil
Ariel
A
Ben-Amar
Hagay
H
Slutzky
D000464:Alginates / Q000737:chemistry; D000890:Anti-Infective Agents / Q000494:pharmacology*; D002176:Candida albicans / Q000187:drug effects; D003760:Dental Impression Materials / Q000494:pharmacology*; D018562:Disease Transmission, Infectious / Q000517:prevention & control*; D013293:Enterococcus faecalis / Q000187:drug effects; D006801:Humans; D006813:Humidity; D019552:Infection Control, Dental / Q000379:methods*; D011145:Polyvinyls / Q000494:pharmacology; D012117:Resins, Synthetic / Q000494:pharmacology; D012833:Siloxanes / Q000494:pharmacology; D013211:Staphylococcus aureus / Q000187:drug effects; D013212:Staphylococcus epidermidis / Q000187:drug effects; D013440:Sulfides / Q000494:pharmacology; D013696:Temperature; D013997:Time Factors
D000464:Alginates; D000890:Anti-Infective Agents; D003760:Dental Impression Materials; C022821:Impregum; D011145:Polyvinyls; D012117:Resins, Synthetic; D012833:Siloxanes; D013440:Sulfides; C480691:aquasil; C032915:polysulfide