KACD
Search
- Page Path
- HOME > Search
Original Articles
- Effect of each light curing units on the microhardness and microleakage of composite resin
- Eu-Jin Jung, Hee-Joo Lee, Bock Hur
- J Korean Acad Conserv Dent 2004;29(1):58-65. Published online January 31, 2004
- DOI: https://doi.org/10.5395/JKACD.2004.29.1.058
-
Abstract
PDF
PubReader
ePub The objectives of this study was to evaluate current visible light curing units regarding microhardness and microleakage. Fourty samples of composite resin(Z-250, 3M) were cured by different light curing units(Flipo, LOKKI; Credi II, 3M; XL 3000, 3M; Optilux 500,Demetron) in acrylic blocks. Microhardness was measured using a calibrated Vickers indenter on both top and bottom surfaces after 24 hours of storage in air at room temperature. Class V cavities were prepared on buccal and lingual surfaces of fourty extracted human molars. Each margin was on enamel and dentin/cementum. Composite resin(Z-250, 3M) was filled in cavities and cured by four different light curing units(Flipo, LOKKI; Credi II, 3M; XL 3000, 3M; Optilux 500, Demetron).
The results of this syudy were as follows:
Microhardness
1. Flipo showed low microhardness compared to Optilux 500, Credi II significantly in upper surface. Flipo didn't show a significant difference compared to XL 3000.
2. The microhardness resulting from curing with Flipo was lower than that of others on lower surfaces.
Microleakage
1. Dentin margin showed significantly high dye penetration rate than enamel margin in all groups(p<0.05).
2. No significant differences were found on both enamel and dentin margin regarding curing units.
- 17 View
- 0 Download
- EFFECT OF LIGHT SOURCE AND SHADE ON DEPTH OF CURE OF COMPOSITES
- Joon-Sok Na, Sun-Wa Jeong, Yun-Chan Hwang, Sun-Ho Kim, Chang Yun, Won-Mann Oh, In-Nam Hwang
- J Korean Acad Conserv Dent 2002;27(6):561-568. Published online January 14, 2002
- DOI: https://doi.org/10.5395/JKACD.2002.27.6.561
-
Abstract
PDFPubReaderePub
ABSTRACT Purpose of this research is estimating polymerization depth of different source of light. XL 3000 for halogen light, Apollo 95E for plasma arc light and Easy cure for LED light source were used in this study. Different shade (B1 & A3) resin composites (Esthet-X, Dentsply, U.S.A.) were used to measure depth of cure. 1, 2, and 3 mm thick samples were light cured for three seconds, six seconds or 10 seconds with Apollo 95E and they were light cured with XL-3000 and Easy cure for 10 seconds, 20 seconds, or 40 seconds. Vicker's hardness test carried out after store samples for 24 hours in distilled water.
Results were as following.
Curing time increases from all source of lights, curing depth increased(p<0.05).
Depth (that except 1mm group and 2mm group which lighten to halogen source of light) deepens in all groups, Vickers hardness decreased(p<0.05).
Vicker's hardness of A3 shade composite was lower in all depths more than B1 shade composites in group that do polymerization for 10 seconds and 20 seconds using halogen source of light(p<0.05), but group that do polymerization for 40 seconds did not show difference(p>0.05).
Groups that do polymerization using Plasma arc and LED source of light did not show Vicker's hardness difference according to color at surface and 1mm depth(p>0.05), but showed difference according to color at 2mm and 3mm depth(p<0.05). The results showed that Apollo 95E need more polymerization times than manufacturer's recommendation (3 seconds), and Easy cure need polymerization time of XL-3000 at least.
- 22 View
- 0 Download
First
Prev
