Online ISSN: 2515-8260

Keywords : polymerization

Effect Of Quartz Tungsten Halogen And Light-Emitting Diode Curing Units On The Polymerization Of Microfilled And Nanofilled Composites: A Comparative In-Vitro Study

Vathsalya Shetty; Anil Richhawal; Abhijeet Khade; Ashish Mandwe; Heeresh Shetty; Sanpreet Singh Sachdev

European Journal of Molecular & Clinical Medicine, 2022, Volume 9, Issue 8, Pages 1368-1379
DOI: 10.48047/ejmcm.v09.i08.1368

Various factors such as the type of light source, irradiance power, exposure time, curing tip distance, degree of conversion, and type of fillers influence the polymerization of light-cure resins and ultimately, the final properties of the restoration. The present study aimed to compare the efficiency of light-emitting diode (LED) and Quartz tungsten halogen (QTH) curing lights and their effect on the polymerization of microfilled (MF) and nanofilled (NF) composite resins.
Materials and Methods
A total sample of n=80 was divided into eight groups (n=10 each) comprising of two types of MF and NF composites each, cured by QTH and LED. The depth of cure, rise in temperature during curing, and the Vicker’s hardness number (VHN) at various depths were evaluated.
Results: The depth of cure was significantly more (p<0.05) in the NF composites as compared to that observed in the MF composites. The temperature rise was found to be significantly more (p<0.05) in samples cured with QTH than in LED. The VHN were found to be significantly higher at 1mm and reduced as the depth of cure increased to 2 mm and 3 respectively.
Conclusion: LED light curing units are more efficient as well as biocompatible as compared to QTH units. NF composites exhibit a greater depth of cure and surface hardness as compared to the MF composite. The rise in temperature during curing is dependent on the curing unit but not the type of composite.

Brief Review On Various Polymerization Methods Of Polyindole

Shivani, Sanchit Mondal; Sams Un Nisa; Harish Mudila

European Journal of Molecular & Clinical Medicine, 2020, Volume 7, Issue 7, Pages 3770-3773

Polyindole (PIND) in current times is one of the chiefly studied conductive
material and is being used in numerous electrical and electrochemical field. However the
conductivity of any conducting polymer chiefly affected by its polymerization technique.
Various polymerization techniques viz. Chemical oxidative polymerization,
Electrochemical polymerization, Interfacial/Emulsion polymerization, etc. are employed
for the same. Each technique used by researcher do have its own pros and cons which
further depends upon the chemical (solvent, oxidants, surfactants, concentration etc.) and
physical (temperature, pressure, etc.) condition to be implied.