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ORIGINAL ARTICLE
Year : 2018  |  Volume : 8  |  Issue : 1  |  Page : 13-16

Comparative evaluation of the effect of variation in light-curing cycle with a time gap and its effect on polymerization shrinkage and microhardness of conventional hydrophobic sealants and moisture-tolerant resin-based sealants: An in vitro study


Department of Pedodontics and Preventive Dentistry, Tamil Nadu, India

Correspondence Address:
Dr. Packialakshmi Arumugam
No. 3/1105, 2nd Street, Sulaiman Nagar, Metukuppam, Thoraipakkam, Chennai - 600 097, Tamil Nadu
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/ijmd.ijmd_56_17

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Aim: This study aimed to evaluate the effect of light-curing modes (standard mode and modified mode) on the polymerization shrinkage and microhardness of a conventional hydrophobic resin sealant – Helioseal F – and a moisture-tolerant resin sealant – Embrace™ WetBond™. Subjects and Methods: A total of forty glass ring molds (8.5 mm in inner diameter and 2 mm in height) were prepared, and etching of the internal surface of the molds was done for 5 min with hydrofluoric acid. The materials (n = 20/group) were placed into the molds and, in Group I, curing was done in contact with the sample surface for 20 s. In Group II, curing was initiated for 10 s at 1-cm distance; a time gap of 10 s was given, followed by 20 s curing in contact with the sample surface. The volumetric polymerization shrinkage and microhardness were calculated. Statistical Analysis Used: All data were analyzed statistically using unpaired t-test at P < 0.05. Results: Curing cycle did not significantly affect the polymerization shrinkage and microhardness of both conventional and moisture tolerant resin-based sealants. The composition of the sealant had a direct influence on polymerization shrinkage and microhardness values. Conclusion: In the clinical scenario where isolation is highly critical, one may consider the use of moisture-tolerant resin-based sealants. This could be augmented with soft-start polymerization which would result in lower degree of polymerization shrinkage without affecting the physical properties, thereby yielding enhanced clinical performance of the pit-and-fissure sealants.


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