@Article{, title={Temperature rise beneath a light–cured materials using two types of curing machines}, author={Abdul–Haq A Suliman and Sabah A Ismail}, journal={Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان}, volume={6}, number={1}, pages={20-25}, year={2006}, abstract={Aim: To measure the temperature rise induced by a light emitting diode (LED) curing unit and byquartz tungsten halogen (QTH) curing unit using two types of composite resin XRV Herculite andVenus. Materials and Methods: Forty extracted non–carious single canal premolars were cleaned andbisected longitudinally. Class V preparations were cut on the buccal surfaces. The teeth were dividedinto four groups; each of ten. The teeth in the first and second groups were restored with XR–Herculitecomposite resin. The teeth in the third and fourth groups were restored with Venus composite resin.The composite resin in the first and third groups were polymerized using QTH curing unit “Astralis”for 40 seconds; the light intensity was 502 mW/cm2. The distance between the tip of the light and thecomposite was 3 + 1 mm. The composite resin in the second and fourth groups was polymerized usingLEDs “Ultra–Lite 200 E plus” curing unit for 20 seconds; the light intensity was 536 mW/cm2 usingthe same distance as the first and third groups. The temperature rise at the pulpal wall was recorded byplacing a thermocouple on the pulpal wall directly under the restoration. Results: The lowesttemperature rise during LED irradiation with Venus composite resin followed by LED irradiation withXRV Herculite composite resin. Whereas QTH curing units with XRV Herculite composite resinproduced higher values, QTH curing units with Venus composite resin produced the highesttemperature rise. Conclusion: The temperature rise of LED curing units and QTH curing units used inthis study was under the limits that affect the integrity of the dental pulp.

} }