Journal of Conservative Dentistry

ORIGINAL ARTICLE
Year
: 2015  |  Volume : 18  |  Issue : 2  |  Page : 154--158

Comparison of variation in the light curing cycle with a time gap and its effect on polymerization shrinkage, degree of conversion and microhardness of a nanohybrid composite


Arunajatesan Subbiya, Newbegin Selvakumar Gold Pearlin Mary, Malathi Suresh, Paramasivam Vivekanandhan, Malarvizhi Dhakshinamoorthy, Vridhachalam Ganapathy Sukumaran 
 Department of Conservative Dentistry and Endodontics, Sree Balaji Dental College and Hospital, Bharath University, Narayanapuram, Pallikaranai, Chennai, Tamil Nadu, India

Correspondence Address:

Background: Giving a time gap and distance during curing can decrease the polymerization shrinkage. Aim: To evaluate the effect of time gap and distance between the curing tip and restoration on the polymerization shrinkage, degree of monomer conversion (DOC), and microhardness of a nanohybrid composite. Materials and Methods: A total of 50 standardized cylindrical specimens (Z350, 3M ESPE) were fabricated using a brass mould. The curing was done in contact with the sample surface for 20 seconds in the control group. In the four experimental groups, curing was initiated at 1-cm distance, followed by variation in the time gap and the curing cycle. The polymerization shrinkage, DOC, microhardness was calculated. Statistical Analysis: One-way analysis of variance (ANOVA) and post hoc-Dunnett test were used to analyze the data. Results: Curing at 1-cm distance for 10 seconds with a gap of 10 seconds and finishing the curing cycle with 20 seconds at 0 cm proved to be an appropriate technique to reduce the polymerization shrinkage without significantly affecting the DOC and microhardness. Conclusion: A simple innovative modification of varying the distance of curing and a time gap in the curing cycle can decrease the polymerization shrinkage without affecting the DOC and microhardness.


How to cite this article:
Subbiya A, Pearlin Mary NG, Suresh M, Vivekanandhan P, Dhakshinamoorthy M, Sukumaran VG. Comparison of variation in the light curing cycle with a time gap and its effect on polymerization shrinkage, degree of conversion and microhardness of a nanohybrid composite.J Conserv Dent 2015;18:154-158


How to cite this URL:
Subbiya A, Pearlin Mary NG, Suresh M, Vivekanandhan P, Dhakshinamoorthy M, Sukumaran VG. Comparison of variation in the light curing cycle with a time gap and its effect on polymerization shrinkage, degree of conversion and microhardness of a nanohybrid composite. J Conserv Dent [serial online] 2015 [cited 2021 Feb 28 ];18:154-158
Available from: https://www.jcd.org.in/article.asp?issn=0972-0707;year=2015;volume=18;issue=2;spage=154;epage=158;aulast=Subbiya;type=0