European Journal of Prosthodontics and Restorative Dentistry

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Cover Date:
March 2006
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Surface Microhardness of a Resin Composite: a Comparison of a Tungsten Halogen and a LED Light Curing Unit, in vitro

Abstract - A comparison has been made between published surface microhardness numbers (VHN) of a commercial resin composite for different exposure times to a quartz tungsten halogen (QTH) and light-emitting diode (LED) light-curing unit (LCU). Both LCUs produced comparable hardness at both top and bottom surfaces, respectively, and similar bottom/top hardness ratios, for a specimen thickness of 1.5 mm, given sufficient exposure time (40 s) and an elapsed time of 24 h before measurement (for hardness numbers). However, some data are significantly different. There is no advantage in either LCU regarding optimal hardness and hardness ratios given an appropriate protocol. Immediate finishing (1 h) was more appropriate to the use of the LED LCU (with adequate exposure time). The effect of elapsed time after exposure on microhardness was more pronounced with the QTH LCU.

KEY WORDS: Resin Composite; Surface Microhardness; Light-Activation; Tungsten Halogen; Light Emitting Diode; Exposure Times

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Noel J. Ray, Christopher D. Lynch, Francis M. Burke, Ailish Hannigan

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  1. Effect of Five Staining Solutions on the Colour Stability of Two Acrylics and Three Composite Resins Based Provisional Restorations
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  1. Surface Microhardness of a Resin Composite: a Comparison of a Tungsten Halogen and a LED Light Curing Unit, in vitro
  2. 7
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  1. Partial Edentulism and Removable Denture Construction: a Frequency Study in Jordanians
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  1. Bond Strength of Luting Cement to Casting and Soldering Alloy
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  1. Film thickness and rheological properties of luting agents for crown cementation
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  1. The effect of cooking method upon the titratable acidity of a popular vegetarian dish – Scope for reducing its erosive potential?
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  1. Variability Of Centric Relation Position In TMD Patients
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  1. Comparison of two topical treatments for dentine sensitivity
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  1. Recording surface detail on moist surfaces with elastomeric impression materials
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