Compatibility of H2O2-Based Surface Disinfectant with Elastomeric Impression Materials

Objectives: Study effects of H2O2 based surface disinfectant (Optim 33 TB - 0.5% SciCan, Canada) on surface detail reproduction and dimensional stability of elastomeric impression materials using ANSI/ADA Spec. 18/19 dies. Methods: ANSI/ADA spec. 18 & 19 dies, Spec. 19 methods were used in this evaluation. Vinyl polysiloxane (VPS) used in this study were Aquasil® (Caulk-Dentsply); Imprint® (3M); and Take-1® (KERR-Sybron SDS), with 16 samples each per treatment and for control, from each material per test made (N=96). Treatment samples sprayed with disinfectant (exposed to TB kill time), while controls were immersed in tap water for the same time. Treatment and control samples were die matched. For Surface Detail, the 25 micron line was examined at 20X and rated (ordinal values) as 1 = Well defined, sharp, continuous line through 4 = Failure to reproduce the line by 3 raters. Statistic used was ‘comparison of group means' (alpha = 0.05). For Dimensional Stability (N=96), the samples were scanned on a flat-bed scanner at high resolution, JPEG tagged files created and length of the 50 micron line measured using Image-Tool Software (UTHSCSA Dental School, San Antonio, USA). Baseline and post-24 hour samples measured (using a Stage Graticule as Standard). Differences in length (due to possible flow/creep) between treatment and control samples determined using “student's t-test” (alpha of 0.05). Results: Surface Detail results were (F=0.275; df=1; p>0.05) between the Treatment Group (n=144; mean=1.29; SD=0.456) and the Control Group (n=144; mean=1.26; SD=0.442). Dimensional Stability results between Treatment and Control groups were (mean difference = -0.005;; t=-0.233 df=94; p>0.05). Conclusions: In this study Optim 33 TB - Accelerated Hydrogen Peroxide-based disinfectant was compatible VPS impression materials with no significant effects on detail reproduction and stability, when used per manufacturer's recommendations.

Funding from SciCan Inc. Canada, through Texas A&M Research Foundation, College Station, Texas.