| Parameters influencing increase in pulp chamber temperature with light-curing devices: curing lights and pulpal flow rates. | |
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MedLine Citation:
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PMID: 20533637 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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This laboratory study examined the effects of curing lights with different light intensities and changing flow rate on the increase in pulpal temperature during the light curing process and the rate of the subsequent decrease in temperature after the termination of light curing. The tip of a temperature sensor was positioned on the pulpal dentinal wall of the buccal side of the maxillary premolar. Metal tubes were inserted in the palatal and buccal root of the tooth, one for water inflow and the other for water outflow. The tubes were connected to a pump to control the flow rate. The water flow rate was set to 4.2 microl/minute, 28 microl/minute or 70 microl/minute. At each flow rate, the unprepared tooth was light cured from the buccal side 1 mm from the buccalsurface, using four different curing lights. The temperature data were recorded and stored on a computer every second for three minutes. The curing lights that were used were: Astralis 10 (QTH(high), Ivoclar Vivadent), Bluephase 16i (LED(conv), Ivoclar Vivadent) and two experimental LED-curing lights (LED(exp2000), LED(exp3000), Ivoclar Vivadent). The power densities were 1200 mW/cm2, 1600 mW/cm2, 2000 mW/cm2 and 3000 mW/cm2, respectively. The curing lights, LED(conv), LED(exp2000) and LED(exp3000) were activated for 60 seconds, and the QTH(high) was activated for 30 sec- onds. The maximum intrapulpal temperature (TM) and rate of temperature change at 30 seconds after turning off the light (S(30LO)) were analyzed by two-way ANOVA with a post-hoc Tukey test (p < 0.05). The influencing factors were the flow rates and curing lights. RESULTS: The T(MAX) ranged from 41.0 degrees C to 53.5 degrees C. There was a difference between the curing lights (p < 0.05), with LED(exp3000) > LED(exp2000) > LED(conv) > QTH(high). There was no difference in T(MAX) between the different flow rates (p > 0.05). Both the curing lights and flow rates affected the SE(30LO) (p < 0.05). The S(30LO) was LED(exp3000) < LED(exp2000) > LEDon, , QTH(high) (p < 0.05). The S(30LO) at 70 microl/minutes was higher than at 4.2 pd/minutes and 28 microl/minutes (p < 0.05). CLINICAL IMPLICATION: Because the increase in temperature is directly related to the light intensity and exposure time, curing devices with high power density (> 1200 mW/cm2) should only be activated for a short period of time (< 15 seconds) even in teeth without cavity preparation. The flow rate had only a negligible effect on the temperature increase. |
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Authors:
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Sung-Ho Park; Jean-François Roulet; Siegward D Heintze |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Operative dentistry Volume: 35 ISSN: 0361-7734 ISO Abbreviation: Oper Dent Publication Date: 2010 May-Jun |
Date Detail:
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Created Date: 2010-06-10 Completed Date: 2010-07-22 Revised Date: 2010-08-02 |
Medline Journal Info:
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Nlm Unique ID: 7605679 Medline TA: Oper Dent Country: United States |
Other Details:
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Languages: eng Pagination: 353-61 Citation Subset: D |
Affiliation:
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Department of Conservative Dentistry, College of Dentistry, Yonsei University, Seoul, Korea. sung-hopark@yuhs.ac |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Bicuspid Body Temperature / physiology* Curing Lights, Dental / classification* Dental Materials / chemistry Dental Pulp Cavity / blood supply, physiology* Dentin / physiology Humans Materials Testing Radiation Dosage Regional Blood Flow / physiology Thermometers Time Factors |
| Chemical | |
Reg. No./Substance:
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0/Dental Materials |
| Comments/Corrections | |
Erratum In:
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Oper Dent. 2010 Jul-Aug;35(4):487 |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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