Surface Hardness of Nanohybrid and Microhybrid Resin Composites Cured by Light Emitting Diode and Quartz Tungsten Halogen Light Curing Systems: An Invitro StudyCorrespondence Address :
Dr. Anuradha Vitthal Wankhade,
Meera Colony, Nachangaonroad, Pulgaon, Tal Deoli, Dist. Wardha, Pulgaon, Maharashtra, India.
Introduction: New generation composite resin materials have revolutionised the art of aesthetic dentistry. The clinical success is dependent on effective polymerisation and surface hardness which in turn are dependent on the performance of Light Curing Units (LCU). This study utilises surface hardness as a measure of degree of polymerisation of composite resins achieved by LCUs.
Aim: To evaluate the difference in surface hardness of nanohybrid and microhybrid resin composites cured by light curing systems, Light Emitting Diode (LED) and Quartz Tungsten Halogen (QTH).
Materials and Methods: In this invitro experimental study, two types of hybrid composites (Nanohybrid and Microhybrid) were tested for surface hardness by using two different light curing systems (LED and QTH). All the Nanohybrid and Microhybrid specimens were cured using LED and QTH LCUs, thus giving four combinations. A total of 60 specimens (6 mm diameter and 2 mm depth) were prepared using Teflon mould with 15 samples for each combination. Surface hardness was measured on upper and lower surface after 24 hours and hardness ratio was calculated. Data was analysed using independent t-test for intergroup comparison. Level of significance was kept at 5%.
Results: Surface hardness of resin composites cured by LED LCU was greater than those cured by QTH LCU. Additionally, the hardness value was greater for the upper surface. Nanohybrids showed better surface hardness than Microhybrids for both the LCUs.
Conclusion: Nanohybrid composite resins and LED system were found to be more effective in terms of surface hardness as compared to their counterparts.
Curing, Dental materials, Hybrid composites, Polymerisation, Restorative dentistry, Surface hardness, Vickers hardness test
Date of Submission: Feb 10, 2020
Date of Peer Review: Mar 22, 2020
Date of Acceptance: May 29, 2020
Date of Publishing: Jul 01, 2020
• Financial or Other Competing Interests: None
• Was Ethics Committee Approval obtained for this study? Yes
• Was informed consent obtained from the subjects involved in the study? Yes
• For any images presented appropriate consent has been obtained from the subjects. Yes
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• Plagiarism X-checker: Feb 11, 2020
• Manual Googling: May 29, 2020
• iThenticate Software: Jun 22, 2020 (16%)
ETYMOLOGY: Author Origin
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