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Objectives:The purpose of this study is to determine the effect of disinfection on dimensional stability of C-silicone impression materials.

Methods: A stainless steel maxillary model was produced. Three tapering preparations were made, one incisal and two molar. 30 impressions were made of C-silicone (Alphasil, Omicron Dental, Germany) with metal tray and divided into 6 groups of 5 impressions each.

Group 1. No immersion, poured after 15 minutes (Supra stone, Kerr, Sybron, Romulus, Mich.).

Group 2. 15 minutes immersion in 1 % didecyldimethyl amonnium chlorid solution (Hexanios Laboratories Anios, France) and poured.

Group 3. No immersion, poured after 60 minutes.

Group 4. 15 minutes immersion in 1 % didecyldimethyl amonium chloride solution and poured after 45 minutes.

Group 5. No immersion and poured after 24 hours.

Group 6. 15 minutes immersion in 1 % didecyldimethyl amonium chloride solution and poured after 24 hours.

Accuracy of techniques was assessed by measuring interabutments (A,B), cross arch(C,D) and occlusogingival (E,F,G) distance on stone dies with 3-D contact measuring device (Tesa MS 6101 3D, Swiss). Data were analyzed with Kruskal-Wallis test.

Results: Mean deformation distances (µm) and standard deviations (SD) of different groups are shown in table..Disinfection procedure and time intervals for model pouring showed no significant differences among the groups.

Conclusion: It was found that the dimension stability of C-silicone impression material was not effected by applied disinfection procedure and time intervals for fabricating a model.

 

	1.Group	2.Group	3.Group	4.Group	5.Group	6.Group
Distances	Mean (SD)	Mean (SD)	Mean (SD)	Mean (SD)	Mean (SD)	Mean (SD)
A	-40±0.114	-174±0.086	-241±0.126	-183±0.151	-167±0.083	-60±0.172
B	63±0.294	-116±0.084	-158±0.106	-113±0.137	-60±0.065	33±0.197
C	-30±0.158	171±0.115	245±0.149	-10±0.242	99±0.104	-127±0.194
D	15±0.148	-163±0.072	-208±0.103	-30±0.226	-166±0.082	57±0.163
E	-9±0.234	-50±0.147	-40±0.140	31±0.267	-152±0.061	45±0.186
F	-40±0.135	32±0.05	-10±0.065	28±0.031	113±0.047	78±0.083
G	64±0.055	76±0.031	82±0.047	111±0.056	82±0.137	105±0.072