PMID: 18203489Jan 22, 2008Paper

Effects of LEDs on microhardness and temperature rise of dental composite resins

Dental Materials Journal
Tae-Sung JeongYong Hoon Kwon

Abstract

The purpose of this study was to examine the effects of LEDs on the polymerization of dental composite resins. Three composite resins and two LED units were used to evaluate the latter's effects on microhardness and temperature rise. In particular, two composite resins contained a coinitiator in addition to camphorquinone (CQ). The emission peak of the tested LEDs matched well with the absorption peak of CQ, while G-Light had one additional but weak peak near 410 nm. As for the coinitiators, their absorption peaks were lower than 400 nm. Within the specimens, incident photons from the LED units showed an exponential decrease in their counts as the specimens became thicker. However, microhardness values decreased and became almost linear at subsurface levels regardless of the curing unit. Among the composite resins, Z250 showed the highest microhardness value. As for the temperature rise (degrees C) due to exothermic reaction at polymerization, it was higher than 5 degrees C for the 40-second light curing with both LED units. Among the specimens, Solitaire 2 cured with G-Light showed the highest temperature rise.

References

Jan 1, 1988·Journal of Dental Research·M TairaM Yamaki
Aug 9, 2003·Journal of Biomaterials Science. Polymer Edition·N DavidenkoR Sastre
Apr 1, 1965·Oral Surgery, Oral Medicine, and Oral Pathology·L ZACH, G COHEN
Dec 31, 2003·Dental Materials : Official Publication of the Academy of Dental Materials·Alexander UhlKlaus D Jandt
Jan 27, 2004·Journal of Dental Research·J C WatahaS Bouillaguet
Jan 28, 2004·Journal of Esthetic Dentistry·F A RueggebergD J Mettenburg
Sep 16, 2004·Journal of Biomedical Materials Research. Part B, Applied Biomaterials·Yong-Keun LeeJohn M Powers
Sep 30, 2004·Journal of Biomedical Materials Research. Part B, Applied Biomaterials·Serge BouillaguetIvo Krejci
Feb 8, 2005·European Journal of Oral Sciences·Erik Asmussen, Anne Peutzfeldt
Mar 9, 2005·Journal of Materials Science. Materials in Medicine·N Emami, K-J M Söderholm
Apr 22, 2005·Journal of Oral Rehabilitation·A KnezevićG Pichler
Jun 28, 2005·Dental Materials : Official Publication of the Academy of Dental Materials·Ulrich LohbauerGeorge Eliades
Sep 1, 2005·Journal of Biomedical Materials Research. Part B, Applied Biomaterials·Ulrich LohbauerAnselm Petschelt

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.

© 2021 Meta ULC. All rights reserved