Effect of exposure intensity and post-cure temperature storage on hardness of contemporary photo-activated composites.

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Effect of exposure intensity and post-cure temperature storage on hardness of contemporary photo-activated composites. / Quance, SC; Shortall, Adrian; Harrington, Edward; Lumley, Philip.

In: Journal of Dentistry, Vol. 29, No. 8, 01.11.2001, p. 553-60.

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@article{3fe4d634a49342fd88422f4ae6259eec,
title = "Effect of exposure intensity and post-cure temperature storage on hardness of contemporary photo-activated composites.",
abstract = "OBJECTIVES: The effect of variation in post-exposure storage temperature (18 vs. 37 degrees C) and light intensity (200 vs. 500mW/cm(2)) on micro-hardness of seven light-activated resin composite materials, cured with a Prismetics Mk II (Dentsply) light activation unit, were studied. METHODS: Hardness values at the upper and lower surfaces of 2mm thick disc shaped specimens of seven light-cured resin composite materials (Herculite XRV and Prodigy/Kerr, Z100 and Silux Plus/3M, TPH/Dentsply, Pertac-Hybrid/Espe, and Charisma/Kulzer), which had been stored dry, were determined 24h after irradiation with a Prismetics Mk II (Dentsply) light activation unit. RESULTS: Hardness values varied with product, surface, storage temperature, and curing light intensity. In no case did the hardness at the lower surface equal that of the upper surface, and the combination of 500mW/cm(2) intensity and 37 degrees C storage produced the best hardness results at the lower surface. CONCLUSIONS: Material composition had a significant influence on surface hardness. Only one of the seven products (TPH) produced a mean hardness values at the lower surface >80% of the maximum mean upper surface hardness obtained for the corresponding product at 500mW/cm(2) intensity/37 degrees C storage temperature when subjected to all four test regimes. Despite optimum post-cure storage conditions, 200mW/cm(2) intensity curing for 40s will not produce acceptable hardness at the lower surface of 2mm increments of the majority of products tested.",
keywords = "light intensity, micro-hardness, resin composite, light-activated, temperature",
author = "SC Quance and Adrian Shortall and Edward Harrington and Philip Lumley",
year = "2001",
month = nov,
day = "1",
doi = "10.1016/S0300-5712(01)00045-8",
language = "English",
volume = "29",
pages = "553--60",
journal = "Journal of Dentistry",
issn = "0300-5712",
publisher = "Elsevier",
number = "8",

}

RIS

TY - JOUR

T1 - Effect of exposure intensity and post-cure temperature storage on hardness of contemporary photo-activated composites.

AU - Quance, SC

AU - Shortall, Adrian

AU - Harrington, Edward

AU - Lumley, Philip

PY - 2001/11/1

Y1 - 2001/11/1

N2 - OBJECTIVES: The effect of variation in post-exposure storage temperature (18 vs. 37 degrees C) and light intensity (200 vs. 500mW/cm(2)) on micro-hardness of seven light-activated resin composite materials, cured with a Prismetics Mk II (Dentsply) light activation unit, were studied. METHODS: Hardness values at the upper and lower surfaces of 2mm thick disc shaped specimens of seven light-cured resin composite materials (Herculite XRV and Prodigy/Kerr, Z100 and Silux Plus/3M, TPH/Dentsply, Pertac-Hybrid/Espe, and Charisma/Kulzer), which had been stored dry, were determined 24h after irradiation with a Prismetics Mk II (Dentsply) light activation unit. RESULTS: Hardness values varied with product, surface, storage temperature, and curing light intensity. In no case did the hardness at the lower surface equal that of the upper surface, and the combination of 500mW/cm(2) intensity and 37 degrees C storage produced the best hardness results at the lower surface. CONCLUSIONS: Material composition had a significant influence on surface hardness. Only one of the seven products (TPH) produced a mean hardness values at the lower surface >80% of the maximum mean upper surface hardness obtained for the corresponding product at 500mW/cm(2) intensity/37 degrees C storage temperature when subjected to all four test regimes. Despite optimum post-cure storage conditions, 200mW/cm(2) intensity curing for 40s will not produce acceptable hardness at the lower surface of 2mm increments of the majority of products tested.

AB - OBJECTIVES: The effect of variation in post-exposure storage temperature (18 vs. 37 degrees C) and light intensity (200 vs. 500mW/cm(2)) on micro-hardness of seven light-activated resin composite materials, cured with a Prismetics Mk II (Dentsply) light activation unit, were studied. METHODS: Hardness values at the upper and lower surfaces of 2mm thick disc shaped specimens of seven light-cured resin composite materials (Herculite XRV and Prodigy/Kerr, Z100 and Silux Plus/3M, TPH/Dentsply, Pertac-Hybrid/Espe, and Charisma/Kulzer), which had been stored dry, were determined 24h after irradiation with a Prismetics Mk II (Dentsply) light activation unit. RESULTS: Hardness values varied with product, surface, storage temperature, and curing light intensity. In no case did the hardness at the lower surface equal that of the upper surface, and the combination of 500mW/cm(2) intensity and 37 degrees C storage produced the best hardness results at the lower surface. CONCLUSIONS: Material composition had a significant influence on surface hardness. Only one of the seven products (TPH) produced a mean hardness values at the lower surface >80% of the maximum mean upper surface hardness obtained for the corresponding product at 500mW/cm(2) intensity/37 degrees C storage temperature when subjected to all four test regimes. Despite optimum post-cure storage conditions, 200mW/cm(2) intensity curing for 40s will not produce acceptable hardness at the lower surface of 2mm increments of the majority of products tested.

KW - light intensity

KW - micro-hardness

KW - resin composite

KW - light-activated

KW - temperature

U2 - 10.1016/S0300-5712(01)00045-8

DO - 10.1016/S0300-5712(01)00045-8

M3 - Article

C2 - 11700205

VL - 29

SP - 553

EP - 560

JO - Journal of Dentistry

JF - Journal of Dentistry

SN - 0300-5712

IS - 8

ER -