AI Article Synopsis
- The study aimed to assess how varying exposure time and light intensity affect the microhardness of cured composite resin through different thicknesses of primary tooth structure.
- A total of 170 resin composite specimens were tested using different light curing units, with varying durations and intensities, and their hardness was measured using the Vickers hardness test.
- Results showed that curing through a 1 mm thick tooth slice decreased microhardness with increased intensity, while specimens cured through thicker slices (2 mm and 3 mm) did not improve in hardness, often falling below clinically acceptable levels.
Article Abstract
Objective: The aim of this study was to evaluate the effect of increased exposure time and light intensity on microhardness of cured composite through different thicknesses of tooth structure in primary teeth.
Materials And Methods: One hundred and seventy cylindrical resin composite specimens were prepared. All specimens were divided into 17 experimental and control groups. "Light-emitting diode" light curing unit (LCU) applied directly or through 1, 2, and 3 mm thicknesses tooth slices for experimental groups. The irradiation protocols were 25 and 50 s at 650 mW/cm(2) and 15 and 30 s at 1100 mW/cm(2). The "quartz-tungsten-halogen" LCU (400 mW/cm(2)) for 40 s was used in control group. Microhardness was measured by the Vickers hardness test.
Results: Indirectly cured specimens and those cured through a 1 mm thick tooth structure, an increase in intensity caused hardness drop. In the specimens cured through 2 and 3 mm thick tooth structures, increased intensity and/or exposure time did not show any appropriate changes on microhardness.
Conclusion: Irradiation through a 1.0 mm thick tooth slice resulted in reduced microhardness although it was still within the clinically acceptable level. The hardness values of the specimens cured through 2 or 3 mm thick tooth slices fell below the clinically acceptable level even after doubling the exposure time and/or light intensity.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4813436 | PMC |
| http://dx.doi.org/10.4103/1305-7456.178316 | DOI Listing |
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