European Journal of Prosthodontics and Restorative Dentistry

cover art

Cover Date:
September 2017
Print ISSN:
0965-7452
Electronic ISSN:
2396-8893
Vol:
25
Issue:
3

Effect of Distance on Light Transmission Through Polymerized Resin Composite

Objective: Light transmittance of dental composites varies between products and shades, but also light curing units differ to each other in their irradiance and fiber optic structure of curing tip.  The aim of this study was to investigate whether there is linear relationship between the distance of the curing tip to the resin composite and irradiance at lower surface of the resin composite. Materials and Methods: Disks of 1 mm thickness (6mm diameter) were fabricated. Light transmittance (intensity) through the disk was measured at distance of 0, 2,
4, 6, 8, 10 mm from the light tip with two light curing units Elipar S10 (3M-ESPE) and Silverlight (GC). Irradiance ratio (irradiance on the sensor surface without the composite disk / with the composite disk) was calculated and plotted against the distance of the light curing tip. Statistical analysis was carried out using analysis of covariance (ANCOVA, Tukey’s, α =0.05). Results: Irradiance ratio varied between 18% to 24% with Silverlight and 21% to 26% with Elipar S10 light curing units. There were statistically significant differences between the ratios with different distances of the light curing tip (p<0.05). Interestingly, the highest irradiance ratio for Elipar S10 unit was found with 4 mm distance of the tip, whereas Silverlight unit had the
highest ratio with 6 mm distance. Out of two tested resin composites, the flowable composite showed higher irradiance ratio than regular packable resin composite. Conclusions: Increase of distance of the light curing tip from the composite surface decreased the absolute irradiance underneath of composite, as expected. However, there seemed to be device dependent optimal distance of 4-6 mm to reach the most efficient irradiance ratio through the composite resin keeping in mind that most efficient transmission of light through the material is reached by having light curing tip in contact to the material.

Keywords
Composites
Light Transmission
Distance
Polymerization
Light-Curing

10.1922/EJPRD_01700Aromaa05

Article Price
£15.00
Institution Article Price
£
Page Start
131
Page End
135
Authors
Mikke K. Aromaa, Lippo V.J. Lassila, Pekka K. Vallittu

Articles from this issue

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  • Pg. End

  1. Nanocryl Coating of PMMA Complete Denture Base Materials to Prevent Scratching
  2. 116
  3. 126

  1. Influence of Different Ceramic Systems on Marginal Misfit
  2. 127
  3. 130

  1. Effect of Distance on Light Transmission Through Polymerized Resin Composite
  2. 131
  3. 135

  1. Survival of Direct Posterior Composites With and Without a Bulk Fill Base
  2. 136
  3. 142

  1. 3D Metal Printing – Additive Manufacturing Technologies for Frameworks of Implant Borne Fixed Dental Prosthesis
  2. 143
  3. 147

  1. British Society of Prosthodontics Annual Conference 2017 report
  2. 148
  3. 149

  1. BSSPD abstracts 2017
  2. 150
  3. 182

  1. BSSPD 2017 prize winners and photos
  2. 183
  3. 183

  1. BSSPD Liverpool 2018 Taster
  2. 184
  3. 184