Effect of a third-generation LED LCU on microhardness of tooth-colored restorative materials

Objective To assess the effects of different modes of a third‐generation light‐curing unit (LCU) (VALO) on the microhardness of restorative materials. Design A microhybrid composite resin (Filtek™ Z550), a giomer (Beautifil II), a compomer (Dyract eXtra) and a RMGIC (Photac™ Fil) were used in the st...

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Bibliographic Details
Published in:International journal of paediatric dentistry 2016-09, Vol.26 (5), p.376-382
Main Authors: Gonulol, Nihan, Ozer, Sezin, Tunc, Emine Sen
Format: Article
Language:English
Subjects:
Bisphenol A-Glycidyl Methacrylate - chemistry
Bisphenol A-Glycidyl Methacrylate - radiation effects
Compomers - chemistry
Compomers - radiation effects
Composite Resins - chemistry
Composite Resins - radiation effects
Curing Lights, Dental - classification
Dental Materials - chemistry
Dental Materials - radiation effects
Dental Restoration, Permanent
Dentistry
Equipment Design
Glass Ionomer Cements - chemistry
Glass Ionomer Cements - radiation effects
Hardness - radiation effects
Lighting - instrumentation
Materials Testing
Microhardness
Pediatrics
Resin Cements - chemistry
Resin Cements - radiation effects
Resins, Synthetic - chemistry
Resins, Synthetic - radiation effects
Surface Properties
Time Factors
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Summary:Objective To assess the effects of different modes of a third‐generation light‐curing unit (LCU) (VALO) on the microhardness of restorative materials. Design A microhybrid composite resin (Filtek™ Z550), a giomer (Beautifil II), a compomer (Dyract eXtra) and a RMGIC (Photac™ Fil) were used in the study. Three different modes of VALO were tested and a second‐generation LCU (Elipar S10) was used as a control. The microhardness (VHN) was measured using a Vickers Hardness tester. Data were analyzed using two‐way anova and post hoc Tukey's test (P < 0.05). Results The Filtek Z550 group had the highest VHN values followed by Photac Fil, Beautifil II and the Dyract eXtra at both top and bottom surfaces, however the difference between Filtek Z550 and Photac Fil was not statistically significant for the bottom surfaces (P > 0.05). Of the different curing protocols tested, the VALO LCU in Mode 3 resulted in the lowest VHN values at both top and bottom surfaces (P < 0.05). Conclusion Based on the results of this study, it can be concluded that the high‐power mode of the VALO LCU can be recommended for clinical applications especially in pediatric patients, as it can shorten the time required to adequately polymerize resin‐based tooth‐colored restorative materials.
ISSN:0960-7439
1365-263X
DOI:10.1111/ipd.12213