Journal of Conservative Dentistry

ORIGINAL ARTICLE
Year
: 2011  |  Volume : 14  |  Issue : 2  |  Page : 151--155

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


N Kulashekar Reddy, IN Aparna 
 Department of Prosthodontics, Mcods, Manipal, India

Correspondence Address:
N Kulashekar Reddy
Flat no 302, Sandhyagiri Appartments, Kalan Nagar, Gaddianaram, Hyderabad - 60
India

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.


How to cite this article:
Reddy N K, Aparna I N. Effect of frequency and amplitude of vibration and role of a surfactant on void formation in models poured from polyvinyl siloxane impressions.J Conserv Dent 2011;14:151-155


How to cite this URL:
Reddy N K, Aparna I N. Effect of frequency and amplitude of vibration and role of a surfactant on void formation in models poured from polyvinyl siloxane impressions. J Conserv Dent [serial online] 2011 [cited 2020 Sep 22 ];14:151-155
Available from: http://www.jcd.org.in/article.asp?issn=0972-0707;year=2011;volume=14;issue=2;spage=151;epage=155;aulast=Reddy;type=0