The Effects of Natural Disinfectant Solutions on Dimensional Stability of Silicon Impression Material.

Abstract

Introduction

It is important to disinfect impression to prevent infection. Accuracy is directly proportion to adaptation of the future prosthesis to the oral mucosa. Most of chemical disinfectant solutions are irritant and, therefore inhalation of disinfectant vapor may present risks to the dental team.

Materials and methods

Thirty six high viscosity putty polysiloxane impression were obtained from special designed master model. The impression were grouped according to natural disinfectant solution into lemon juice and apple vinegar solution and then subgroup according to immersion time into 5, 10, 15 min immersion. All impressions were poured with type 4 dental stone then nine measurements were obtained from each cast.

Results

All casts obtained from high viscosity putty polysiloxane impressions which immersed in lemon juice were discarded due to bad surface texture and brittle casts. Statistical analysis reveals no significant differences between master model and casts obtained from pouring high viscosity putty polysiloxane impressions after 5 min with and without immersion in apple vinegar solution while, for 10 min group shows significant differences in 5 measurements and no significant differences in 4 measurement. The 15 min group shows highly significant differences between groups regarding all tested measurements.

Percentages of changes of all casts were increased with time of pouring the high viscosity putty polysiloxane impressions either with or without immersion in apple vinegar solution.

Discussion

Minimizing the risk of disease transmission in the dental workplace has today become a high priority for the dental profession. Dimensional stability of the impression materials used in prosthetics presents an important factor for the accuracy of dental devices.

Generally, the high viscosity putty polysiloxane impressions shows dimensional changes which inceased with time of pouring. However, there were no significant differences between casts without immersion and casts immersed in apple vinegar solution for 5, 10, 15 min.

Conclusion

High viscosity putty polysiloxane impressions can be disinfected effectively for uses of primary impression for completely or partially edentulous arches, as well as producing opposing casts in prosthodontics treatment, making interocclusal devices, and surgical guides.

Key words:disinfection, polysiloxane impressions, apple vinegar