Temperature Rise in the Pulp Chamber Induced by a Conventional Halogen Light-Curing Source and a Plasma Arc Lamp

2006 ◽  
Vol 2006 ◽  
pp. 16-17
Author(s):  
D.A. Scott
Keyword(s):  
Temperature Rise ◽  
Plasma Arc ◽  
Pulp Chamber ◽  
Halogen Light ◽  
Light Curing

A Study of Temperature Rise in the Pulp Chamber during Composite Polymerization with Different Light-curing Units

2007 ◽  
Vol 8 (7) ◽  
pp. 29-37 ◽  
Author(s):  
Christopher Millen ◽  
Martyn Ormond ◽  
Gillian Richardson ◽  
Ario Santini ◽  
Vesna Miletic ◽  
...  
Keyword(s):  
Light Intensity ◽  
Temperature Rise ◽  
Bonding Agent ◽  
Pulp Chamber ◽  
Data Logger ◽  
Bonding Agents ◽  
Pulp Temperature ◽  
Light Curing ◽  
Temperature Records ◽  
Group 2

Abstract Aim The study compared pulp temperature rise during polymerization of resin-based composites (RBCs) using halogen and LED light-curing units (LCUs). Methods and Materials A total of 32 teeth extracted from patients aged 11-18 years were used in the study. Thermocouples placed on the roof of the pulp chamber using a novel ‘split-tooth’ method. In Group 1 a halogen LCU with a light intensity of 450 mWcm-2 was used and in Group 2, an LED LCU with a light intensity of 1100 mWcm-2 was used. The teeth were placed in a water bath with the temperature regulated until both the pulp temperature and the ambient temperature were stable at 37°C. Continuous temperature records were made via a data logger and computer. The increase in temperature from baseline to maximum was calculated for each specimen during the curing of both the bonding agent and the RBC. Results The rise in pulp temperature was significantly higher with the LED LCU than with the halogen LCU for bonding and RBC curing (p<0.05). The major rise in temperature occured during the curing of the bonding agent. During the curing of the RBC, rises were smaller. Conclusions Curing of bonding agents should be done with low intensity light and high intensity used only for curing RBC regardless of whether LED or halogen LCUs are used. Citation Millen C, Ormond M, Richardson G, Santini A, Miletic V, Kew P. A Study of Temperature Rise in the Pulp Chamber during Composite Polymerization with Different Light-curing Units. J Contemp Dent Pract 2007 November; (8)7:029-037.

Thermal Variations in the Pulp Chamber Associated with Composite Insertion Techniques and Light-curing Methods

2009 ◽  
Vol 10 (1) ◽  
pp. 17-24 ◽  
Author(s):  
Mário Alexandre Coelho Sinhoreti ◽  
Ricardo Danil Guiraldo ◽  
Simonides Consani ◽  
Lourenço Correr-Sobrinho ◽  
Luis Felipe Jochims Schneider
Keyword(s):  
Light Exposure ◽  
Resin Composite ◽  
Continuous Light ◽  
Pulp Chamber ◽  
Pulp Tissue ◽  
Soft Start ◽  
Halogen Light ◽  
Curing Methods ◽  
Light Curing ◽  
Insertion Techniques

Abstract Aim The aim of this study was to investigate the effect of different incremental insertion techniques, photoactivation, and restorative phases on thermal variations occurring during the polymerization of Filtek Z250 composite resin. Methods and Materials The experiment was conducted using 90 bovine incisor teeth. The teeth were randomly assigned to three groups according to the technique used for photoactivation with a halogen light (continuous, soft-start, or intermittent). The groups were further separated into three subgroups according to method of increment placement (bulk, oblique, or horizontal/vertical) for a total of nine groups (n=10). Restorations were placed in a controlled environment (37°C and 50±10% RU) and the temperature recorded using a digital thermometer coupled to a Type-K thermocouple inserted in the pulp chamber through the root canal in contact with the dentin. Data were analyzed using an analysis of variance (ANOVA) and the Tukey's test. Results Higher temperature values were found for continuous light photoactivation in combination with the placement of horizontal/vertical composite increments and photoactivation of the adhesive using a continuous light exposure. Conclusion The light source is the most important factor producing temperature changes during photoactivation of resin composite. Clinical Significance Temperature increases in the pulp chamber due to light curing should be considered to avoid harming the delicate pulp tissue when large restorations or inlays/onlays require several consecutive light curing exposures for a complete cure. Citation Guiraldo RD, Consani S, Sinhoreti MAC, Correr-Sobrinho L, Schneider LFJ. Thermal Variations in the Pulp Chamber Associated with Composite Insertion Techniques and Light-curing Methods. J Contemp Dent Pract 2009 January; (10)1:017-024.

scholarly journals Comparison of temperature rise in the pulp chamber with different light curing units: An in-vitro study

2010 ◽  
Vol 13 (3) ◽  
pp. 132 ◽  
Author(s):  
RajeshA.V Ebenezar ◽  
R Anilkumar ◽  
R Indira ◽  
S Ramachandran ◽  
MR Srinivasan
Keyword(s):  
Temperature Rise ◽  
In Vitro Study ◽  
Vitro Study ◽  
Pulp Chamber ◽  
Light Curing

scholarly journals Temperature rise caused in the pulp chamber under simulated intrapulpal microcirculation with different light-curing modes

2015 ◽  
Vol 85 (3) ◽  
pp. 381-385 ◽  
Author(s):  
Sabri Ilhan Ramoglu ◽  
Hilal Karamehmetoglu ◽  
Tugrul Sari ◽  
Serdar Usumez
Keyword(s):  
Temperature Rise ◽  
Critical Value ◽  
Pulp Chamber ◽  
Group 4 ◽  
Blood Microcirculation ◽  
Light Curing ◽  
Group 3 ◽  
Group 2 ◽  
Labial Surface ◽  
Group 1

ABSTRACT Objective:  To evaluate and compare intrapulpal temperature rise with three different light-curing units by using a study model simulating pulpal blood microcirculation. Materials and Methods:  The roots of 10 extracted intact maxillary central incisors were separated approximately 2 mm below the cement-enamel junction. The crowns of these teeth were fixed on an apparatus for the simulation of blood microcirculation in pulp. A J-type thermocouple wire was inserted into the pulp chamber through a drilled access on the palatal surfaces of the teeth. Four measurements were made using each tooth for four different modes: group 1, 1000 mW/cm2 for 15 seconds; group 2, 1200 mW/cm2 for 10 seconds; group 3, 1400 mW/cm2 for 8 seconds; and group 4, 3200 mW/cm2 for 3 seconds. The tip of the light source was positioned at 2 mm to the incisor's labial surface. Results:  The highest temperature rise was recorded in group 1 (2.6°C ± 0.54°C), followed by group 2 (2.57°C ± 0.62°C) and group 3 (2.35°C ± 0.61°C). The lowest temperature rise value was found in group 4 (1.74°C ± 0.52°C); this value represented significantly lower ΔT values when compared to group 1 and group 2 (P  =  .01 and P  =  .013, respectively). Conclusions:  The lowest intrapulpal temperature rise was induced by 3200 mW/cm2 for 3 seconds of irradiation. Despite the significant differences among the groups, the temperature increases recorded for all groups were below the critical value of 5.6°C.

Plasma arc versus halogen light curing of orthodontic brackets: a 12-month clinical study of bond failures

2004 ◽  
Vol 125 (3) ◽  
pp. 342-347 ◽  
Author(s):  
Maria Francesca Sfondrini ◽  
Vittorio Cacciafesta ◽  
Andrea Scribante ◽  
Catherine Klersy
Keyword(s):  
Clinical Study ◽  
Orthodontic Brackets ◽  
Plasma Arc ◽  
Halogen Light ◽  
Light Curing

Pulp Chamber Temperature Rise during Curing of Resin-Based Composites with Different Light-Curing Units

2008 ◽  
Vol os15 (1) ◽  
pp. 33-38
Author(s):  
Kathryn Durey ◽  
Ario Santini ◽  
Vesna Miletic
Keyword(s):  
Temperature Rise ◽  
Light Emitting Diode ◽  
High Energy ◽  
Energy Output ◽  
Confidence Limits ◽  
Halogen Light ◽  
Significant Difference ◽  
Pulp Temperature ◽  
Light Curing ◽  
Led Lights

Aims The purpose of the present study was to measure the intrapulpal temperature rise occurring during polymerisation of different shades of resin-based composites (RBCs), and two light-emitting diode (LED) units. Methods Seventy non-carious permanent molars, that had been extracted for orthodontic purposes and stored in 2% thymol for not more than four months, were selected. Patient age range was 11–18 years. Standard cavity preparation with standardised remaining dentine thickness and placement of thermocouples (TCs) was prepared using a novel split-tooth technique. Cavities were filled with one of two shades of RBC (A2 and C4, Filtek Z250, 3M ESPE, Seefeld, Germany), and cured with two LED high-intensity units (Elipar Freelight2, 3M ESPE, Seefeld, Germany; Bluephase, Ivoclar Vivadent, Schaan, Liechtenstein) and a conventional halogen light-curing unit (LCU) (Prismetics Lite 2, Dentsply, Weybridge, Surrey, UK) as a control. Results Pulp temperature rises during bonding [A2 results: H;2.67/0.48:E;5.24/1.32;B;5.99/1.61] were always greater than during RBC curing [A2 results: 2.44/0.63;E3.34/0.70;B3.38/0.60], and these were significant for both LED lights but not for the halogen control, irrespective of shade (Mann-Whitney test: 95% confidence limits). Temperature rises were at times in excess of the values normally quoted as causing irreversible pulp damage. Pulp temperature rises during bonding were higher with the LED lights than with the halogen control. There was no significant difference in temperature rise between the two LED lights when bonding but there was a significant difference between the two LED lights and the halogen control LCUs (Kruskal-Wallis Test: 95% confidence limits). Conclusions The results support the view that there is a potential risk for heat-induced pulpal injury when light-curing RBCs. The risk is greater during bonding and with high energy, as compared to low-energy output systems. As the extent of tolerable thermal trauma by the pulp tissues is unknown, care and consideration should be given to the choice of LCU and the exposure time when curing RBCs, and especially during bonding.

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 The Effect of Irradiation Distance on Microhardness of Resin Composites Cured with Different Light Curing Units

2010 ◽  
Vol 04 (04) ◽  
pp. 440-446 ◽  
Author(s):  
Isil Cekic-Nagas ◽  
Ferhan Egilmez ◽  
Gulfem Ergun
Keyword(s):  
Light Emitting Diode ◽  
Resin Composite ◽  
Composite Layer ◽  
Hardness Test ◽  
Resin Composites ◽  
Plasma Arc ◽  
Light Emitting ◽  
Quartz Tungsten Halogen ◽  
Halogen Light ◽  
Light Curing

Objectives: The aim of this study was to compare the microhardness of five different resin composites at different irradiation distances (2 mm and 9 mm) by using three light curing units (quartz tungsten halogen, light emitting diodes and plasma arc).Methods: A total of 210 disc-shaped samples (2 mm height and 6 mm diameter) were prepared from different resin composites (Simile, Aelite Aesthetic Enamel, Clearfil AP-X, Grandio caps and Filtek Z250). Photoactivation was performed by using quartz tungsten halogen, light emitting diode and plasma arc curing units at two irradiation distances (2 mm and 9 mm). Then the samples (n=7/ per group) were stored dry in dark at 37°C for 24 h. The Vickers hardness test was performed on the resin composite layer with a microhardness tester (Shimadzu HMV). Data were statistically analyzed using nonparametric Kruskal Wallis and Mann-Whitney U tests.Results: Statistical analysis revealed that the resin composite groups, the type of the light curing units and the irradiation distances have significant effects on the microhardness values (P<.05).Conclusions: Light curing unit and irradiation distance are important factors to be considered for obtaining adequate microhardness of different resin composite groups. (Eur J Dent 2010;4:440-446)

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