Effect of frequency and amplitude of vibration and role of a surfactant on void formation in models poured from polyvinyl siloxane impressions

Reddy, Kulashekar N and Aparna, IN (2011) Effect of frequency and amplitude of vibration and role of a surfactant on void formation in models poured from polyvinyl siloxane impressions. Journal of Conservative Dentistry, 14 (2). pp. 151-155. ISSN 0972-0707

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Abstract

Aims: To determine whether the frequency and amplitude of vibration and the use of surfactant has any effect on the formation of voids on the cast surface, poured from a polyvinyl siloxane impression material, using a mechanical model vibrator. Materials and Methods: A total of 100 impressions of a master die were made using Reprosil, Type 1, Medium Viscosity, Regular body, and Dentsply Caulk. The test group was subdivided into a surfactant and non-surfactant group, 50 impressions each. The impressions were poured in a dental stone with a mechanical model vibrator that was set at a vibration frequency of 3000 cycles / minute (low) and 6000 cycles / minute (high) with the help of a knob. The resultant casts were examined with a Stereomicroscope (LABOMED CZM4) under x10 magnifications. Results: For the low and high frequencies, when surfactant and non-surfactant groups were compared, for all the amplitudes and for both the material groups, the surfactant groups resulted in fewer void formations and showed very high statistical significance (P-value = 0.001). Conclusions: The lowest mean voids were obtained for high frequency surfactant groups. Reprosil: High frequency amplitude 2 being the most prominent, produced the least mean voids (mean = 23.2000, P = 0.001, very highly significant). In comparison, the surfactant groups produced the least voids for both frequencies.

Item Type: Article
Uncontrolled Keywords: Void-free casts; polyvinyl siloxane impressions; surfactant; mechanical model vibrator.
Subjects: Dentistry > MCODS Manipal > Prosthodontics
Depositing User: KMC Library
Date Deposited: 22 Sep 2015 15:26
Last Modified: 22 Sep 2015 15:26
URI: http://eprints.manipal.edu/id/eprint/144027

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