Evaluation of intensity standards of tungsten-halogen and led curing units.
Abstract
Current evidence indicates that the minimum light intensity of photo curing units required to polymerize in a reliable way a composite resin, in increments of 2mm, is 300mW/cm2. The recent introduction of new generations of composite resin materials for large volume increments, partially contrasts with ISO 4049 (2009), calling for the use of light intensity of 1,000mW/cm2. Therefore, it is considered relevant to carry out periodic measurements of the emission intensity of light-curing units of clinical use. The aim of this study was to test the intensity [mW/cm2] of a representative sample of tungsten-halogen and LED photopolymerization units used in private and public health service in different areas of the Valparaíso Region in Chile. This was achieved through the use of dental radiometers, without considering the variables of intensity modification over time (either spontaneously, by undesirable inherent characteristics of the device, or by programs of intensity modification in time), or the density of accumulated power needed. This in vitro diagnostic test, evaluated a sample of 507 units, 107 halogen and 400 LED, for a period of around one month, using two radiometers as measuring instruments. For LED units the Bluephase Meter® radiometer, from Ivoclar-VivadentTM was used, and for halogen units we used the Coltolux® from ColténeTM. As a result, 85% of the LED and halogen units achieved the minimum requirements of intensity needed for the polymerization of conventional dental biomaterials. However, only 25% from the tested units achieved a power density of 1,000mW/cm2.
References
2. Marjanovic J, Veljovic DN, Stasic JN, Savic-Stankovic T, Trifkovic B, Miletic V. Optical properties of composite restorations influenced by dissimilar dentin restoratives. Dent Mater. 2018;34(5):737–45.
3. Rueggeberg FA, Giannini M, Arrais GAG, Price RBT. Light curing in dentistry and clinical implications: a literature review. Braz Oral Res. 2017;31(suppl 1):e61.
4. Pfeifer S, Friedl KH, Hiller KA, Schneider A, Schmalz G. Efficiency of LED and Halogen Polymerization in composite restorations. J Dent Res. 2002;abs:3974.
5. Rueggeberg FA. State-of-the-art: dental photocuring--a review. Dent Mater. 2011;27(1):39–52.
6. Ilie N, Luca BI. Efficacy of Modern Light Curing Units in Polymerizing Peripheral Zones in Simulated Large Bulk-fill Resin-composite Fillings. Oper Dent. 2018;43(3):416–25.
7. Omidi BR, Gosili A, Jaber-Ansari M, Mahdkhah A. Intensity output and effectiveness of light curing units in dental offices. J Clin Exp Dent. 2018;10(6):e555–60.
8. Price RB, Ferracane JL, Shortall AC. Light-Curing Units: A Review of What We Need to Know. J Dent Res. 2015;94(9):1179–86.
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