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

Abstract

Aims/Objectives:This in vitro study was designed to measure and compare the temperature rise in the pulp chamber with different light curing units.Materials and Methods:The study was done in two settings-in-vitro and in-vivo simulation. In in-vitro setting, 3mm and 6mm acrylic spacers with 4mm tip diameter thermocouple was used and six groups were formed according to the light curing source- 3 Quartz-Tungsten-Halogen (QTH) units and 3 Light-Emitting-Diode (LED) units. For the LED units, three modes of curing like pulse-cure mode, fast mode and ramp mode were used. For in-vivo simulation, 12 caries free human third molar tooth with fused root were used. K-type thermocouple with 1 mm tip diameter was used. Occlusal cavity was prepared, etched, rinsed with water and blot dried; bonding agent was applied and incremental curing of composite was done. Thermal emission for each light curing agent was noted.Results:Temperature rise was very minimal in LED light cure units than in QTH light cure units in both the settings. Temperature rise was minimal at 6mm distance when compared to 3 mm distance. Among the various modes, fast mode produces the less temperature rise. Temperature rise in all the light curing units was well within the normal range of pulpal physiology.Conclusion:Temperature rise caused due to light curing units does not result in irreversible pulpal damage.

Comparison of the Amount of Temperature Rise in the Pulp Chamber of Teeth Treated With QTH, Second and Third Generation LED Light Curing Units: An In Vitro Study

“…The decrease in light intensity of the LCU was in conformity with the inverse square Temperature Rise With conventional QTH and Advanced LED Light Curing Units: An In Vitro Study law for the distances between the tip of the LCU and the surface of the restoration. [13][14][15] For QTH light curing unit, at 3 mm distance, a temperature rise of 4.5-7.2°C was recorded. For second and third generation LED devices, the temperature risings recorded at 3 mm distance were between 2.5-4.8 o C and 1.7-2.5 o C respectively.…”

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

“…It seems that high-power units create significant temperature increases on the surface, which cannot be transferred as a result of short curing times (ie, 3-8 seconds). Rajesh Ebenezar et al 19 similarly reported that the fast mode produces significantly less temperature rise than do the ramp and pulse-cure modes in LED units.…”

“…However, there are contradictory findings in the literature too. Rajesh Ebenezar et al 19 reported that the quartz-tungsten-halogen units caused significantly greater temperature rise than did LED light-cure units. Malkoç et al 16 reported significantly higher intrapulpal temperature changes for highand low-intensity halogen light units than for the LED and plasma arc curing light, which is in accordance with the findings of Ulusoy et al 20 and Uzel et al 21 Similarly, in the present study, the minimum temperature change was found to be 1.74uC 6 0.52uC for the most powerful curing mode, Valo Xtra power mode (3200 mW/cm 2 for 3 seconds), which was significantly lower than changes recorded for Lux V (1000 mW/cm 2 for 15 seconds) and Elipar S10 (1200 mW/cm 2 for 10 seconds) (P , .05).…”

Kalsi̇yum Si̇li̇ka İçeri̇kli̇ Pulpa Kaplama Materyali̇ni̇n Işik Kaynağinin Üç Farkli Modu İle Poli̇meri̇zasyonu Esnasinda Oluşan Isi Artişinin İncelenmesi̇

“…Kullanılan ışık kaynağının çıkış gücü, tasarımı, diş veya polimerize edilen materyale ulaşan ışık yoğunluğu ve kullanılan polimerizasyon modu ortaya çıkan ısıyı etkilemektedir. 16,19,25 Bu çalış-mada; ışıkla sertleşen kalsiyum silikat içerikli rezin modifiye bir pulpa kaplama materyalinin polimerizasyonu amacıyla kullanılan LED ışık kaynağının, 3 farklı polimerizasyon modunda pulpa odası içerisinde oluşturduğu ısı değişikliklerinin pulpa içerisindeki kan akışı simüle edilerek ölçülmesi amaçlanmıştır. Çeşitli operatif işlemlerin dentin-pulpa kompleksi üzerinde yarattığı potansiyel termal zarar uzun yıllardır birçok araştırmaya konu olurken, pulpal sirkülâsyonun dentin-pulpa kompleksi içerisinde oluşan ısı artışındaki etkilerini konu alan sınırlı çalışma mevcuttur.…”

“…5, [15][16][17]25 Pulpa odası ile kavite tabanı arasında kalan dentin kalınlığının pulpada oluşan ısı değişikliklerini etkilediği, kalan dentin kalınlığı azaldıkça pulpada oluşan ısı artışının arttığı bilinmektedir. 5,33 Bu nedenle çalışmada bu faktörlerden kaynaklanabilecek ve gruplar arasında fark oluşturabilecek dişlere ait anatomik ve ultrastrüktürel değişiklikleri elimine etmek için tüm testler hazırlanan tek bir diş üzerinde gerçekleştirildi.…”