Comparison of Composite Curing Parameters: Effects of Light Source and Curing Mode on Conversion, Temperature Rise and Polymerization Shrinkage

10.2341/05-15 ◽  
2006 ◽  
Vol 31 (2) ◽  
pp. 219-226 ◽  
Author(s):  
Z. Tarle ◽  
A. Knezevic ◽  
N. Demoli ◽  
A. Meniga ◽  
J. Sutalo ◽  
...  
Keyword(s):  
Light Source ◽  
Temperature Rise ◽  
Thermal Injury ◽  
Resin Composite ◽  
Marginal Adaptation ◽  
Low Intensity ◽  
Halogen Light ◽  
Lower Temperature ◽  
Final Degree ◽  
Conversion Temperature

Clinical Relevance The use of a low intensity light source for photopolymerization based on LED technology provides equivalent final degree conversion with possible flow of the resin composite, similar to when QTH technology is used. At the same time, the lower temperature rise in the sample and the more favorable development of shrinkage kinetics compared to the higher intensities of halogen light may aid in maintaining marginal adaptation while avoiding possible thermal injury.

scholarly journals Effects of Light Curing Method and Exposure Time on Mechanical Properties of Resin Based Dental Materials

2008 ◽  
Vol 02 (01) ◽  
pp. 37-42 ◽  
Author(s):  
A. Rıza Alpöz ◽  
Fahinur Ertuḡrul ◽  
Dilsah Cogulu ◽  
Aslı Topaloḡlu Ak ◽  
Metin Tanoḡlu ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Light Source ◽  
Exposure Time ◽  
Resin Composite ◽  
Dental Materials ◽  
Glass Ionomer Cement ◽  
Curing Time ◽  
Uniform Size ◽  
Halogen Light ◽  
Light Curing

ABSTRACTObjectives: The aim of this study was to investigate microhardness and compressive strength of composite resin (Tetric-Ceram, Ivoclar Vivadent), compomer (Compoglass, Ivoclar, Vivadent), and resin modified glass ionomer cement (Fuji II LC, GC Corp) polymerized using halogen light (Optilux 501, Demetron, Kerr) and LED (Bluephase C5, Ivoclar Vivadent) for different curing times.Methods: Samples were placed in disc shaped plastic molds with uniform size of 5 mm diameter and 2 mm in thickness for surface microhardness test and placed in a diameter of 4 mm and a length of 2 mm teflon cylinders for compressive strength test. For each subgroup, 20 samples for microhardness (n=180) and 5 samples for compressive strength were prepared (n=45). In group 1, samples were polymerized using halogen light source for 40 seconds; in group 2 and 3 samples were polymerized using LED light source for 20 seconds and 40 seconds respectively. All data were analyzed by two way analysis of ANOVA and Tukey’s post-hoc tests.Results: Same exposure time of 40 seconds with a low intensity LED was found similar or more efficient than a high intensity halogen light unit (P>.05), however application of LED for 20 seconds was found less efficient than 40 seconds curing time (P=.03).Conclusions: It is important to increase the light curing time and use appropriate light curing devices to polymerize resin composite in deep cavities to maximize the hardness and compressive strength of restorative materials. (Eur J Dent 2008;2:37-42)

scholarly journals Temperature Rise during Resin Composite Polymerization under Different Ceramic Restorations

2011 ◽  
Vol 05 (03) ◽  
pp. 305-309 ◽  
Author(s):  
Isa Yondem ◽  
Subutay Han Altintas ◽  
Aslihan Usumez
Keyword(s):  
Temperature Rise ◽  
Zirconium Oxide ◽  
Temperature Increase ◽  
Resin Composite ◽  
Lithium Disilicate ◽  
Oxide Ceramic ◽  
Ceramic System ◽  
Temperature Changes ◽  
Halogen Light ◽  
Ceramic Restorations

ABSTRACTObjectives: The purpose of this study was to measure temperature increase induced by various light polymerizing units during resin composite polymerization beneath one of three types of ceramic restorations. Methods: The resin composite (Variolink II) was polymerized between one of three different ceramic specimens (zirconium oxide, lithium disilicate, feldspathic) (diameter 5 mm, height 2 mm) and a dentin disc (diameter 5 mm, height 1 mm) with a conventional halogen light, a high intensity halogen light, or an LED unit. The temperature rise was measured under the dentin disc with a J-type thermocouple wire connected to a data logger. Ten measurements were carried out for each group. The difference between the initial and highest temperature readings was taken and the 10 calculated temperature changes were averaged to determine the mean value in temperature rise. Two way analysis of variance (ANOVA) was used to analyze the data (polymerizing unit, ceramic brand) for significant differences. The Tukey HSD test was used to perform multiple comparisons (α=.05). Results: Temperature rise did not vary significantly depending on the light polymerizing unit used (P=.16), however, the type of ceramic system showed a significant effect on temperature increases (P<.01). There were no statistically significant differences between lithium disilicate and feldspathic ceramic systems (P >.05); in comparison, the resin composite polymerized under the zirconium oxide ceramic system induced a significantly lower temperature increase than the other ceramic systems tested (P<.05) Conclusions: The resin composite polymerized beneath zirconium oxide ceramic system induced significantly smaller temperature changes. The maximal temperature increase detected in all groups in this study was not viewed as critical for pulpal health. (Eur J Dent 2011;5:305-309)

Effect of Simulated Pulpal Microcirculation on Temperature When Light Curing Bulk Fill Composites

2019 ◽  
Vol 44 (3) ◽  
pp. 289-301 ◽  
Author(s):  
SSL Braga ◽  
LRS Oliveira ◽  
MTH Ribeiro ◽  
ABF Vilela ◽  
GR da Silva ◽  
...  
Keyword(s):  
Temperature Rise ◽  
Light Transmission ◽  
Resin Composite ◽  
Exothermic Reaction ◽  
Adhesive System ◽  
Degree Of Conversion ◽  
Pulp Chamber ◽  
Significance Level ◽  
Light Curing ◽  
Lower Temperature

SUMMARY Objectives: To evaluate the effect of light curing bulk fill resin composite restorations on the increase in the temperature of the pulp chamber both with and without a simulated pulpal fluid flow. Methods and Materials: Forty extracted human molars received a flat occlusal cavity, leaving approximately 2 mm of dentin over the pulp. The teeth were restored using a self-etch adhesive system (Clearfil SE Bond, Kuraray) and two different bulk fill resin composites: a flowable (SDR, Dentsply) and a regular paste (AURA, SDI) bulk fill. The adhesive was light cured for 20 seconds, SDR was light cured for 20 seconds, and AURA was light cured for 40 seconds using the Bluephase G2 (Ivoclar Vivadent) or the VALO Cordless (Ultradent) in the standard output power mode. The degree of conversion (DC) at the top and bottom of the bulk fill resin composite was assessed using Fourier-Transform Infra Red spectroscopy. The temperature in the pulp chamber when light curing the adhesive system and resin composite was measured using a J-type thermocouple both with and without the presence of a simulated microcirculation of 1.0-1.4 mL/min. Data were analyzed using Student t-tests and two-way and three-way analyses of variance (α=0.05 significance level). Results: The irradiance delivered by the light-curing units (LCUs) was greatest close to the top sensor of the MARC resin calibrator (BlueLight Analytics) and lowest after passing through the 4.0 mm of resin composite plus 2.0 mm of dentin. In general, the Bluephase G2 delivered a higher irradiance than did the VALO Cordless. The resin composite, LCU, and region all influenced the degree of cure. The simulated pulpal microcirculation significantly reduced the temperature increase. The greatest temperature rise occurred when the adhesive system was light cured. The Bluephase G2 produced a rise of 6°C, and the VALO Cordless produced a lower temperature change (4°C) when light curing the adhesive system for 20 seconds without pulpal microcirculation. Light curing SDR produced the greatest exothermic reaction. Conclusions: Using simulated pulpal microcirculation resulted in lower temperature increases. The flowable composite (SDR) allowed more light transmission and had a higher degree of conversion than did the regular paste (AURA). The greatest temperature rise occurred when light curing the adhesive system alone.

scholarly journals Effect of halogene light source on marginal microleakage of resin composite restorations

2010 ◽  
Vol 57 (1) ◽  
pp. 14-20
Author(s):  
Natasa Gajic ◽  
Aleksandra Djeri ◽  
Zeljka Kojic ◽  
Natasa Trtic
Keyword(s):  
Composite Materials ◽  
Light Source ◽  
Resin Composite ◽  
Human Teeth ◽  
Class V ◽  
Composite Restorations ◽  
Halogen Light ◽  
Significant Difference ◽  
Halogen Light Source ◽  
Control Light

Introduction. Although the technology of production resin composite materials has been improved in the past years, polymerization shrinkage and microleakage still remain the main problem of the resin composite restorations. The most important issues are polymerization control, light source choice, quality and polymerization technique. The aim of this study was to evaluate the effect of the halogen light source on the marginal microleakage of the resin composite restorations class V. Material and Methods. The study included 40 extracted human teeth (20 intact and 20 with caries lesion). Class V cavity was prepared in each tooth. The light curing unit used in this study had irradiance 540 mW/cm2. Cavities were restored with the two resin composite materials, Filtek Supreme (3M ESPE) and Luksogal - Galenika. Microleakage was determined using colored solution of 50% silver-nitrate. Results were obtained using stereomicroscope with 6 times magnification. Color penetration was evaluated on the occlusal and gingival wall. Results. Linear color penetration was observed in all cavities restored using Luksogal. There was significant difference (p<0.01) in color penetration between the occlusal (20.30 ?m) and gingival wall (34.00 ?m). Color penetration was shown in all cavities prepared on intact and caries teeth and restored using Filtek Supreme. Also, color penetration on the occlusal wall (13.80 ?m) was significantly lower (p<0.01) than the penetration on the gingival wall (33.00 ?m). Conclusion. All the tested cavities showed marginal leakage, regardless the tooth or material used. Greater microleakage was noticed when Luksogal was used.

scholarly journals The Effect of Different Adhesive Types and Curing Methods on Microleakage and the Marginal Adaptation of Composite Veneers

2009 ◽  
Vol 10 (3) ◽  
pp. 18-26 ◽  
Author(s):  
Horieh Moosavi ◽  
Fathemeh Maleknejad ◽  
Nasrin Sarabi ◽  
Resa Shahriari ◽  
Taybeh Shayankhah
Keyword(s):  
Resin Composite ◽  
Resin Cement ◽  
Marginal Adaptation ◽  
Luting Agents ◽  
Bonding System ◽  
Halogen Light ◽  
Two Samples ◽  
Significant Difference ◽  
Curing Methods ◽  
Indirect Composite

Abstract Aim The aim of this in vitro study was to evaluate the influence of application techniques (with pre-curing vs without pre-curing) for dentin adhesive on microleakage and marginal adaptation of indirect composite veneer restorations. Methods and Materials A total-etch bonding system, Excite/Variolink II (EXV), and a self-etching primer system, Panavia F2.0 (PF2), were used in the study. Forty-eight human central incisors were prepared for composite veneer restorations. The teeth were divided into two groups (n=24). For each resin cement, one half of each experimental group included an adhesive pre-cure (PC) with a halogen light source while the other half received no pre-cure (NPC) prior to resin cement insertion. Thus, four experimental groups were created: A (PC+EXV), B (NPC+EXV), C (PC+PF2), and D (NPC+PF2). Veneers made of Tetric Ceram resin composite were cemented using dual-cured resin luting agents. After storage in distilled water at 37°C for 24 hours, the teeth were prepared for marginal leakage. Two samples of each group were selected at random for scanning electron microscopic (SEM) observation and evaluation of marginal adaptation at 1050x magnification. Data were analyzed using the Kruskal-Wallis and Mann-Whitney tests (Ð <0.05). Results The highest and lowest microleakage values were observed in dentinal margins of groups B and A, respectively. Dentin margins opposite to enamel margins had a significant difference in microleakage values of PC and NPC groups (P<0.05). The influence of the adhesive pre-cure was more pronounced than the type of resin cement used. No adhesive layer was visualized for the adhesives used without employing the pre-curing step. Conclusion The effect of pre-cured adhesives was not material specific. The pre-cured adhesives showed the best resistance to dye penetration although the film thickness of these luting agents was only slightly increased. Clinical Significance Different curing methods (with pre-curing/without pre-curing) regardless of total-etch or self-etch adhesive systems influenced microleakage and the marginal adaptation, especially dentin margins of indirect composite veneers. Citation Maleknejad F, Moosavi H, Shahriari R, Sarabi S, Shayankhah T. The Effect of Different Adhesive Types and Curing Methods on Microleakage and the Marginal Adaptation of Composite Veneers. J Contemp Dent Pract 2009 May; (10)3:018-026.

Comparison of the effects of operating microscopes with light emitting diode and halogen light source on the eye: a rabbit study

2021 ◽  
pp. 1-7
Author(s):  
Bahri Aydın ◽  
Armagan Ozgur ◽  
Huseyin Baran Ozdemir ◽  
Pınar Uyar Gocun ◽  
Mehmet Arda Inan ◽  
...  
Keyword(s):  
Light Source ◽  
Light Emitting Diode ◽  
Light Emitting ◽  
Halogen Light ◽  
Halogen Light Source

Use of a general purpose integrating sphere as a low intensity near-UV extended uniform light source

Optik ◽  
2021 ◽  
pp. 167169
Author(s):  
Martin Vacula ◽  
Pavel Horvath ◽  
Ladislav Chytka ◽  
Kai Daumiller ◽  
Ralph Engel ◽  
...  
Keyword(s):  
Light Source ◽  
General Purpose ◽  
Integrating Sphere ◽  
Low Intensity

scholarly journals Effect of Light-Sources and Thicknesses of Composite Onlays on Micro-Hardness of Luting Composites

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6849
Author(s):  
Francesco De Angelis ◽  
Mirco Vadini ◽  
Mario Capogreco ◽  
Camillo D’Arcangelo ◽  
Maurizio D’Amario
Keyword(s):  
High Power ◽  
Resin Composite ◽  
Composite Layer ◽  
Resin Cement ◽  
Specimen Thickness ◽  
Light Sources ◽  
Curing Time ◽  
Resin Cements ◽  
Halogen Light ◽  
Light Curing

The aim of this study was to compare three different light-curing-units (LCUs) and determine their effectiveness in the adhesive cementation of indirect composite restorations when a light-curing resin cement is used. Two resin composites were selected: Enamel Plus HRI (Micerium) and AURA (SDI). Three thicknesses (3 mm, 4 mm and 5 mm) were produced and applied as overlays and underlays for each resin composite. A standardized composite layer was placed between underlay and overlay surfaces. Light curing of the resin-based luting composites was attained through the overlay filters using LCUs for different exposure times. All specimens were allocated to experimental groups according to the overlay thickness, curing unit and curing time. Vickers Hardness (VH) notches were carried out on each specimen. Data were statistically evaluated. The curing unit, curing time and overlay thickness were significant factors capable of influencing VH values. The results showed significantly decreased VH values with increasing specimen thickness (p < 0.05). Significant differences in VH values were found amongst the LCUs for the various exposure times (p < 0.05). According to the results, a time of cure shorter than 80 s (with a conventional quartz–tungsten–halogen LCU) or shorter than 40 s (with a high-power light-emitting diode (LED) LCU) is not recommended. The only subgroup achieving clinically acceptable VH values after a short 20 s curing time included the 3 mm-thick overlays made out of the AURA composite, when the high-power LED LCU unit was used (VH 51.0). Composite thickness has an intense effect on polymerization. In clinical practice, light-cured resin cements may result in insufficient polymerization for high thickness and inadequate times. High-intensity curing lights can attain the sufficient polymerization of resin cements through overlays in a significantly shorter time than conventional halogen light.

Role of Additional Retention on Marginal Adaptation and Sealing of Large Resin Composite Class II Restorations

2007 ◽  
Vol 32 (6) ◽  
pp. 564-570 ◽  
Author(s):  
S. K. Ishikiriama ◽  
R. F. L. Mondelli ◽  
S. C. Kano ◽  
A. Ishikiriama ◽  
J. Mondelli
Keyword(s):  
Clinical Relevance ◽  
Resin Composite ◽  
Class Ii ◽  
Marginal Adaptation

Clinical Relevance Retention grooves in proximal box cavities can minimize microleakage and improve marginal adaptation of large resin composite Class II restorations.

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