Effect of disinfection on the dimensional stability of polyether impression materials.
OBJECTIVE
Difficulties in sterilizing impressions have led to chemical disinfection solutions as an alternative; however, some impression materials are more sensitive to humidity. For example, polyether impression materials are more hydrophilic. This study investigated the effect of three disinfecting methods on the dimensional stability of three polyether impression materials.


METHODS
Three polyether impression materials (P2, Impregum Penta Soft, and Impregum Penta) were submitted to the following treatments: spray disinfectant (Mikrozid Liquid), immersion in 2% glutaraldehyde solution (Super-On), immersion in 0.525% sodium hypochlorite solution for 10 minutes, and a control group (not disinfected). Each group included five samples. After treatment, dimensional change was evaluated according to ISO 4823. The data were analyzed by 2-way analysis of variance at alpha= 0.05.


RESULTS
The mean percentages of linear dimensional change of materials P2, Penta Soft, and Penta were -0.040%, 0.098%, and 0.100%, respectively. The dimensional change associated with different disinfectant agents mikrozid liquid, 2% glutaraldehyde, room air (control), and 0.525% sodium hypochlorite was 0.013%, 0.024%, 0.077%, and 0.096%, respectively. The interaction between the impression materials and the disinfectant treatment was not significant. The disinfectant agents can be classified in two groups as low- and high-effected. The control group did not significantly differ from either group.


CONCLUSIONS
From the standpoint of dimensional change, the disinfectants tested for 10 minutes caused no significant linear dimensional change in the polyether impression materials, compared with the control group.
Yilmaz
Handan
H
Department of Prosthodontics, Faculty of Dentistry, Gazi University, Ankara, Turkey.
Aydin
Cemal
C
Gul
Basak
B
Yilmaz
Caner
C
Semiz
Mustafa
M
D000336:Aerosols; D003760:Dental Impression Materials / Q000737:chemistry*; D004202:Disinfectants / Q000737:chemistry; D004203:Disinfection / Q000379:methods*; D004987:Ethers / Q000737:chemistry; D005976:Glutaral / Q000737:chemistry; D006801:Humans; D007101:Immersion; D008422:Materials Testing; D012117:Resins, Synthetic / Q000737:chemistry; D012973:Sodium Hypochlorite / Q000737:chemistry; D012996:Solutions; D013499:Surface Properties; D013997:Time Factors
D000336:Aerosols; D003760:Dental Impression Materials; D004202:Disinfectants; D004987:Ethers; C022821:Impregum; D012117:Resins, Synthetic; D012996:Solutions; D012973:Sodium Hypochlorite; D005976:Glutaral