Micro-hardness evaluation of a micro-hybrid composite resin light cured with halogen light, light-emitting diode and argon ion laser

2007 ◽  
Vol 24 (1) ◽  
pp. 87-92 ◽  
Author(s):  
Katia M. Rode ◽  
Patricia M. de Freitas ◽  
Patricia R. Lloret ◽  
Lynn G. Powell ◽  
Miriam L. Turbino
Keyword(s):  
Hybrid Composite ◽  
Composite Resin ◽  
Light Emitting Diode ◽  
Micro Hardness ◽  
Light Emitting ◽  
Argon Ion Laser ◽  
Halogen Light ◽  
Ion Laser ◽  
Argon Ion

scholarly journals Effectiveness of composite resin polymerization using light-emitting diodes (LEDs) or halogen-based light-curing units

2004 ◽  
Vol 18 (3) ◽  
pp. 266-270 ◽  
Author(s):  
Bianca Micali ◽  
Roberta Tarkany Basting
Keyword(s):  
Hybrid Composite ◽  
Composite Resin ◽  
Clinical Performance ◽  
Light Emitting Diode ◽  
Composite Resins ◽  
Light Emitting ◽  
Halogen Light ◽  
Light Curing ◽  
Blue Solution

The clinical performance of composite resins is greatly influenced by the quality of the light-curing unit used. The aim of this study was to compare the efficiency of a commercial light-emitting diode (LED) with that of a halogen-based light-curing unit by means of dye penetration of a micro hybrid composite resin. The composite resin evaluated was Filtek Z250 (3M Dental). The composite was filled into acrylic moulds that were randomly polymerized for 40 seconds by each of the light-emitting systems: light-emitting diode Ultraled (Dabi Atlante) or halogen light Degulux (Degussa Hüls) curing units. Immediately after polymerization, each specimen was individually immersed in 1 ml of 2% methylene blue solution at 37°C ± 2°C. After 24 hours, the specimens were rinsed under running distilled water for 1 minute and stored at 37°C ± 2°C at relative humidity for 24 hours. The composite resins were removed from the moulds and individually triturated before being immersed in new test tubes containing 1 ml of absolute alcohol for 24 hours. The solutions were filtered and centrifuged for 3 minutes at 4,000 rpm and the supernatant was used to determine absorbance in a spectrophotometer at 590 nm. To verify the differences between groups polymerized by LED or halogen light t-test was applied. No significant differences were found between composite resins light-cured by LED or halogen light-curing unit (p > 0.05). The commercially LED-based light-curing unit is as effective to polymerize hybrid composite resins as the halogen-based unit.

scholarly journals Degree of conversion of different composite resins photo-activated with light-emitting diode and argon ion laser

Laser Physics ◽  
2014 ◽  
Vol 25 (2) ◽  
pp. 025601 ◽  
Author(s):  
A M Messias ◽  
M R Galvão ◽  
J M C Boaventura ◽  
D P Jacomassi ◽  
M I B Bernardi ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Composite Resins ◽  
Degree Of Conversion ◽  
Light Emitting ◽  
Argon Ion Laser ◽  
Ion Laser ◽  
Argon Ion

scholarly journals The Influence of Temperature on the Efficacy of Polymerization of Composite Resin

2007 ◽  
Vol 8 (6) ◽  
pp. 9-16 ◽  
Author(s):  
Wedad Y. Awliya
Keyword(s):  
Composite Resin ◽  
Light Emitting Diode ◽  
Composite Resins ◽  
Significance Level ◽  
Light Emitting ◽  
Influence Of Temperature ◽  
Soft Start ◽  
Halogen Light ◽  
Different Temperatures ◽  
Influence Of Temperature On

Abstract Aim The purpose of this study was to investigate the effect of different temperatures on the efficacy of polymerization during the insertion of composite resin using different light curing units. Methods and Materials A total of 45 disc-shaped specimens were fabricated from Z250 composite resin (3M/ESPE, St. Paul, MN, USA) with 15 each prepared at three different temperatures (refrigerated to 5°C, room temperature at 25°C, and preheated to 37°C). Each of these temperature-controlled specimen groups of 15 were then subdivided into three groups of five specimens, according to the type of curing light used to polymerize them. Curing lights included a conventional halogen light (QTH) in two modes (continuous and softstart polymerization) and a light emitting diode (LED). The microhardness of the top and bottom surfaces of the specimens was determined using a Buehler Micromet II digital microhardness tester (Buehler, Dusseldorf, Germany). Data obtained was analyzed using two-way analysis of variance (ANOVA)/Post Hoc Tukey's test at a 0.05 significance level. Results As the temperature of composite resin increased, the top and bottom microhardness of the specimens also increased regardless of the type of polymerizing light used. The LED light produced a significantly better hardness on top and bottom surfaces of composite resin specimens polymerized at the three different temperatures. Effectiveness of cure at top and bottom surfaces of composite specimens was significantly reduced by using soft-start curing. Conclusion The use of pre-warmed composite resins might help to improve polymerization of composite resin especially at the deeper areas of a restoration which could result in an increase in the expected life of a composite restoration. Citation Awliya WY. The Influence of Temperature on the Efficacy of Polymerization of Composite Resin. J Contemp Dent Pract 2007 September; (8)6:009-016.

Shrinkage stress and mechanical properties of photoactivated composite resin using the argon ion laser

2009 ◽  
Vol 96 (1) ◽  
pp. 79-84 ◽  
Author(s):  
C. S. Delfino ◽  
C. S. C. Pfeifer ◽  
R. R. Braga ◽  
M. N. Youssef ◽  
M. L. Turbino
Keyword(s):  
Mechanical Properties ◽  
Composite Resin ◽  
Shrinkage Stress ◽  
Argon Ion Laser ◽  
Ion Laser ◽  
Argon Ion

Argon ion laser curing depth effect on a composite resin

2010 ◽  
Vol 26 (4) ◽  
pp. 421-425 ◽  
Author(s):  
Míriam Lacalle Turbino ◽  
Luis Carlos Belan ◽  
Valéria Soprano ◽  
Kátia Martis Rode ◽  
Patrícia Ramos Lloret ◽  
...  
Keyword(s):  
Composite Resin ◽  
Depth Effect ◽  
Argon Ion Laser ◽  
Ion Laser ◽  
Laser Curing ◽  
Argon Ion

The Knoop Hardness of a Composite Resin Polymerized with Different Curing Lights and Different Modes

2007 ◽  
Vol 8 (2) ◽  
pp. 52-59 ◽  
Author(s):  
A. Rüya Yazici ◽  
Gerard Kugel ◽  
Gülsün Gül
Keyword(s):  
High Intensity ◽  
Composite Resin ◽  
Light Emitting Diode ◽  
Surface Hardness ◽  
Knoop Hardness ◽  
Light Emitting ◽  
Soft Start ◽  
Quartz Tungsten Halogen ◽  
Halogen Light ◽  
Mode 3

Abstract Aim The purpose of this study was to compare the surface hardness of a hybrid composite resin polymerized with different curing lights. Methods and Materials Two 3.0 mm thick composite resin discs were polymerized in a prepared natural tooth mold using: (1) a conventional quartz-tungsten halogen light (QTH- Spectrum 800); (2) a high-intensity halogen light, Elipar Trilight (TL) - standard/exponential mode; (3) a high-intensity halogen light, Elipar Highlight (HL) - standard/soft-start mode; (4) a light-emitting diode, Elipar Freelight (LED); and (5) a plasma-arc curing light, Virtuoso (PAC). Exposure times were 40 seconds for the halogen and LED lights, and three and five seconds for the PAC light. Following polymerization, the Knoop hardness was measured at the bottom and the top surfaces of the discs. Results Significant differences were found between top and bottom Knoop Hardness number (KHN) values for all lights. The hardness of the top and bottom surfaces of both specimens cured by the PAC light was significantly lower than the other lights. No significant hardness differences were observed between the remaining curing units at the top of the 2.0 mm specimens. Significant differences were found between the LED and two modes of HL on the bottom surfaces. For the 3.0 mm thick samples, while significant differences were noted between LED and TL standard mode and between the two TL curing modes on the top, significant differences were only observed between QTH and the standard modes of TL and HL at the bottom. Citation Yazici AR, Kugel G, Gül G. The Knoop Hardness of a Composite Resin Polymerized with Different Curing Lights and Different Modes. J Contemp Dent Pract 2007 February;(8)2:052-059.

scholarly journals Analysis of the microtensile bond strength to enamel of two adhesive systems polymerized by halogen light or LED

2005 ◽  
Vol 19 (4) ◽  
pp. 307-311 ◽  
Author(s):  
Ana Paula Morales Cobra Carvalho ◽  
Míriam Lacalle Turbino
Keyword(s):  
Bond Strength ◽  
Composite Resin ◽  
Light Emitting Diode ◽  
Adhesive System ◽  
Light Sources ◽  
Market Place ◽  
Light Emitting ◽  
Soft Start ◽  
Microtensile Testing ◽  
Halogen Light

With the development of composite resin polymerization techniques, LEDs were introduced to the market place. Based on the studied literature, the aim of this study was to evaluate, through microtensile testing, the bond strength to enamel of a composite resin associated to a conventional (multi-bottle) adhesive system or to a self etching primer adhesive system, polymerized by halogen light or LED (light emitting diode). Bovine teeth were divided into 4 groups with 10 teeth each (n = 10). Then the adhesives Scotchbond Multipurpose Plus (3M-ESPE) and Clearfil SE Bond (Kuraray) were applied following the manufacturers’ instructions. Both systems were polymerized for 10 s by halogen light (Degulux Soft Start - Degussa Hulls) set at 550 mW/cm² or by LED (Kerr Demetron) set at 600 mW/cm². The composite resin Filtek Z-250 was applied in four 1 mm increments with the aid of a square, condensation silicon, 5 mm x 5 mm matrix, and polymerized by either of light sources for 40 s. Scotchbond Multipurpose Plus polymerized by halogen light presented the highest bond strength values (39.69 ± 7.07 MPa), and the other groups did not present statistically significant differences: Scotchbond Multipurpose Plus polymerized by LED (22.28 ± 2.63 MPa), Clearfil SE Bond polymerized by halogen light (27.82 ± 2.65 MPa) and by LED (22.89 ± 5.09 MPa).

Microhardness of a dental restorative composite resin containing nanoparticles polymerized with argon ion laser

Optik ◽  
2012 ◽  
Vol 123 (3) ◽  
pp. 263-267 ◽  
Author(s):  
Carina Sinclér Delfino ◽  
Michel Nicolau Youssef ◽  
Fábio Barbosa De Souza ◽  
Rodivan Braz ◽  
Míriam Lacalle Turbino
Keyword(s):  
Composite Resin ◽  
Argon Ion Laser ◽  
Ion Laser ◽  
Dental Restorative ◽  
Argon Ion
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