Controlling In Vivo, Human Pulp Temperature Rise Caused by LED Curing Light Exposure

2019 ◽  
Vol 44 (3) ◽  
pp. 235-241 ◽  
Author(s):  
DC Zarpellon ◽  
P Runnacles ◽  
C Maucoski ◽  
U Coelho ◽  
FA Rueggeberg ◽  
...  
Keyword(s):  
Temperature Rise ◽  
Repeated Measures ◽  
Light Exposure ◽  
Simultaneous Application ◽  
Pulp Temperature ◽  
Light Curing ◽  
Pulp Exposure ◽  
Baseline Temperature ◽  
Student’S T

SUMMARY Objective: The objective of this study was to evaluate the in vivo effectiveness of air spray to reduce pulp temperature rise during exposure of intact premolars to light emitted by a high-power LED light-curing unit (LCU). Methods and Materials: After local Ethics Committee approval (#255945), intact, upper first premolars requiring extraction for orthodontic reasons from five volunteers received infiltrative and intraligamental anesthesia. The teeth (n=9) were isolated using rubber dam, and a minute pulp exposure was attained. The sterile probe from a wireless, NIST-traceable, temperature acquisition system was inserted directly into the coronal pulp chamber. Real-time pulp temperature (PT) (°C) was continuously monitored, while the buccal surface was exposed to a polywave LED LCU (Bluephase 20i, Ivoclar Vivadent) for 30 seconds with simultaneous application of a lingually directed air spray (30s-H/AIR) or without (30s-H), with a seven-minute span between each exposure. Peak PT values were subjected to one-way, repeated-measures analysis of variance, and PT change from baseline (ΔT) during exposure was subjected to paired Student's t-test (α=0.05). Results: Peak PT values of the 30s-H group were significantly higher than those of 30s-H/AIR group and those from baseline temperature (p<0.001), whereas peak PT values in the 30s-H/AIR group were significantly lower than the baseline temperature (p=0.003). The 30s-H/AIR group showed significantly lower ΔT values than did the 30s-H group (p<0.001). Conclusion: Applying air flow simultaneously with LED exposure prevents in vivo pulp temperature rise.

scholarly journals Comparison of in vivo and in vitro models to evaluate pulp temperature rise during exposure to a Polywave® LED light curing unit

2019 ◽  
Vol 27 ◽  
Author(s):  
Patricio Runnacles ◽  
Cesar Augusto Galvão Arrais ◽  
Cristiane Maucoski ◽  
Ulisses Coelho ◽  
Mario Fernando De Goes ◽  
...  
Keyword(s):  
Temperature Rise ◽  
In Vitro Models ◽  
Led Light ◽  
Pulp Temperature ◽  
Light Curing

In vivo temperature rise in anesthetized human pulp during exposure to a polywave LED light curing unit

2015 ◽  
Vol 31 (5) ◽  
pp. 505-513 ◽  
Author(s):  
Patrício Runnacles ◽  
Cesar Augusto Galvão Arrais ◽  
Marcia Thais Pochapski ◽  
Fábio André dos Santos ◽  
Ulisses Coelho ◽  
...  
Keyword(s):  
Temperature Rise ◽  
Led Light ◽  
Light Curing

scholarly journals Influence of Bulk-Fill Composites, Polimerization Modes, and Remaining Dentin Thickness on Intrapulpal Temperature Rise

2019 ◽  
Vol 2019 ◽  
pp. 1-7 ◽  
Author(s):  
Serdar Akarsu ◽  
Sultan Aktuğ Karademir
Keyword(s):  
Temperature Rise ◽  
Variance Analysis ◽  
Resin Composites ◽  
Application Time ◽  
Led Light ◽  
Low Viscosity ◽  
Single Tooth ◽  
Light Curing ◽  
Dentin Thickness

Objectives. The aim of this study was to compare the effects of different bulk-fill resin composites, polimerization modes, and the thickness of remaining dentin on the increase of intrapulpal temperature. Methods. Human-extracted upper premolar teeth (n = 10) were used to design a single-tooth model with remaining dentin thicknesses of 1 mm and 0.5 mm. Estelite Bulk-fill Flow (Tokuyama, Japan), Surefil SDR™ Flow (Dentsply Caulk, Brazil), Filtek Bulk-Fill Posterior (3M, USA), and SonicFill™ 2 Bulk-fill (Kerr, USA) composites were applied according to the manufacturer’s instructions. The standard and high modes of a light emitted diode (LED) light curing unit (LCU) (VALO™ Utradent, USA), were used for polymerization. In order to mimic the in vivo conditions of pulpal circulation, digital flowmetry (SK-600II, SK Medical, China) was used. Intrapulpal temperature rise was measured using K type thermocoupling (CEM DT 610B, Robosem Engineering, China). Data were analyzed using three-way variance analysis (ANOVA) and the independent t-test. Results. No significant statistical differences in intrapulpal temperature rise between low viscosity bulk-fill composites (SDR and Estelite) were found. The lowest intrapulpal temperature rise was found in groups which used the Filtek Bulk-fill composite. Decreases in the remaining dentin thickness increased the intrapulpal temperature rise. Significance. This study demonstrated that remaining dentin thickness, filler ratio of bulk-fill composites, and power and application time of the LED-LCU may affect intrapulpal temperature rise.

In Vivo Pulp Temperature Changes During Class V Cavity Preparation and Resin Composite Restoration in Premolars

2021 ◽  
Author(s):  
DC Zarpellon ◽  
P Runnacles ◽  
C Maucoski ◽  
DJ Gross ◽  
U Coelho ◽  
...  
Keyword(s):  
Repeated Measures ◽  
High Speed ◽  
Resin Composite ◽  
Bonding Layer ◽  
Water Spray ◽  
Cavity Preparation ◽  
Class V ◽  
Diamond Bur ◽  
Pulp Temperature

SUMMARY Objective: This in vivo study evaluated the influence of the sequence of all restorative steps during Class V preparation and restoration in human premolars on pulp temperature (PT). Methods and Materials: Intact premolars with orthodontic extraction indication of 13 volunteers received infiltrative anesthesia and isolation with rubber dam. An occlusal preparation was made with a high-speed diamond bur under air-water spray until the pulp was minimally exposed, then a thermocouple probe was inserted within the pulp. A deep, 2.0-mm depth Class V preparation was made using a high-speed diamond bur under air-water spray. Three restorative techniques were performed (n=7): Filtek Z250 placed in two increments (10-second exposure, shade:A2, 3M ESPE, St. Paul, MN, USA), Filtek Z350 XT (40-second exposure, shade:A3D, 3M ESPE) and Tetric N Ceram Bulk Fill (10-second exposure, shade:IVA, Ivoclar Vivadent, Schaan, Liechtenstein), both placed in a single layer. Bonding layer and resin composite were exposed to light from the same Polywave LCU (Bluephase 20i, Ivoclar Vivadent). The peak PT and the difference between peak PT and baseline (ΔT) values were subjected to two-way, repeated measures analysis of variance (ANOVA), followed by the Bonferroni post-hoc test (α=0.05). Results: Cavity preparation and etch & rinse procedures decreased the PT values (p<0.001). The 40-second exposure of Filtek Z350 caused the highest peak PT values (38.7±0.8°C) and the highest ΔT values (3.4±0.8°C), while Tetric N Ceram Bulk Fill showed the lowest values (−1.6±1.3°C; p=0.009). Conclusion: None of the evaluated procedures resulted in a PT rise near to values that could offer any risk of thermal damage to the pulp.

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.

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.

In vivo temperature rise and acute inflammatory response in anesthetized human pulp tissue of premolars having Class V preparations after exposure to Polywave® LED light curing units

2020 ◽  
Vol 36 (9) ◽  
pp. 1201-1213 ◽  
Author(s):  
Dayane Jaqueline Gross ◽  
Andrés Dávila-Sánchez ◽  
Patrício Runnacles ◽  
Driellen Christine Zarpellon ◽  
Fagner Kiratcz ◽  
...  
Keyword(s):  
Inflammatory Response ◽  
Temperature Rise ◽  
Acute Inflammatory Response ◽  
Pulp Tissue ◽  
Class V ◽  
Led Light ◽  
Light Curing

Influence of Class V preparation on in vivo temperature rise in anesthetized human pulp during exposure to a Polywave ® LED light curing unit

2018 ◽  
Vol 34 (6) ◽  
pp. 901-909 ◽  
Author(s):  
Driellen Christine Zarpellon ◽  
Patrício Runnacles ◽  
Cristiane Maucoski ◽  
Dayane Jaqueline Gross ◽  
Ulisses Coelho ◽  
...  
Keyword(s):  
Temperature Rise ◽  
Class V ◽  
Led Light ◽  
Light Curing

A New Model for Quantitative In Vivo Microscopic Analysis of Thrombus Formation and Vascular Recanalisation: The Ear of the Hairless (hr/hr) Mouse

1997 ◽  
Vol 78 (05) ◽  
pp. 1408-1414 ◽  
Author(s):  
Frank Roesken ◽  
Martin Ruecker ◽  
Brigitte Vollmar ◽  
Nicole Boeckel ◽  
Eberhard Morgenstern ◽  
...  
Keyword(s):  
Endothelial Cell ◽  
Light Exposure ◽  
Thrombus Formation ◽  
Microscopic Analysis ◽  
Cell Interaction ◽  
Vascular Perfusion ◽  
Vessel Occlusion ◽  
Endothelial Cell Interaction ◽  
Platelet Deposition

SummaryThe alteration of rheological blood properties as well as deterioration of vascular perfusion conditions and cell-cell interactions are major determinants of thrombus formation. Herein, we present an experimental model which allows for quantitative in vivo microscopic analysis of these determinants during both thrombus formation and vascular recanalisation. The model does not require surgical preparation procedures, and enables for repeated analysis of identical microvessels over time periods of days or months, respectively. After i.v. administration of FITC-dextran thrombus formation was induced photochemically by light exposure to individual arterioles and venules of the ear of ten anaesthetised hairless mice. In venules, epiillumination induced rapid thrombus formation with first platelet deposition after 0.59 ± 0.04 min and complete vessel occlusion within 7.48 ±1.31 min. After a 24-h time period, 75% of the thrombosed venules were found recanalised. Marked leukocyte-endothelial cell interaction in those venules indicated persistent endothelial cell activation and/or injury, even after an observation period of 7 days. In arterioles, epi-illumination provoked vasomotion, while thrombus formation was significantly (p <0.05) delayed with first platelet deposition after 2.32 ± 0.22 min and complete vessel occlusion within 20.07 ±3.84 min. Strikingly, only one of the investigated arterioles was found recanalised after 24 h, which, however, did not show leukocyte-endothelial cell interaction. Heparin (300 U/kg, i.v.) effectively counteracted the process of thrombus formation in this model, including both first platelet deposition and vessel occlusion. We conclude that the model of the ear of the hairless mouse allows for distinct in vivo analysis of arteriolar and venular thrombus formation/ recanalisation, and, thus, represents an interesting tool for the study of novel antithrombotic and thrombolytic strategies, respectively.

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