Evaluation of the Effect of Different Curing Units and Exposure Times on Pulp Chamber Temperature Using Simulated Pulpal Microcirculation

OpenAlex İngilizce

Yapay Pulpal Mikrosirkülasyonu Kullanılarak Farklı Işınlama Üniteleri ve Işınlama Sürelerinin Pulpa Odası Sıcaklığına Etkisinin DeğerlendirilmesiAmaç: İki farklı ışınlama süresinde dört farklı ışık kaynağı kullanılarak ışıkla sertleştirme sırasında fizyolojik kan mikrosirkülasyonu ile birlikte pulpa odası sıcaklık artışlarını karşılaştırmak.Objective: To compare the elevations in physiological pulp chamber temperature and blood microcirculation during light curing using four different light sources at two different exposure times.Materials and Methods: The study was performed on eighty Class-V cavities divided into eight groups of ten experiments each, according to the curing unit and exposure time.Short-term curing was performed in four groups: quartz-tungstenhalogen (QTH)-20 seconds (s) (XL3000, 3M ESPE, St. Paul, MN, USA); Woodpecker (WP)-15s (Lux V Light Cure Unit, WP, Apexion Dental Products); KR-10s (Demi Plus Dental Curing Light, Kerr Dental) and VL-3s (VALO light-emitting diode Curing Light Xtra Power mode, Ultradent Products, South Jordan, UT, USA).The same units were used for long-term curing at double the exposure time (i.e., QHT-40s, WP-30s, KR-20s, VL-3+3s).Composite material (Filtek Ultimate, 3M/ESPE) was placed into the cavities, followed by light curing performed at a distance of 1 mm.Temperature changes in the pulp chamber were recorded.The Kruskal-Wallis test, followed by Mann-Whitney U multiple comparisons test, were used for statistical analyses, with p<0.001 considered to be statistically significant.Results: There were no significant differences among the curing units at the same exposure times.However, increases in pulp chamber temperatures varied significantly depending on the curing time (p<0.001).All the curing units induced significantly higher intrapulpal temperature changes at long-term curing times, except the WP groups (p<0.001).WP-30s, KR-20s and VL-3+3s exhibited critical temperature increases >5.5 °C.Conclusion: Longer curing times led to critical temperature increases in the pulp chamber.Shorter curing times can protect the pulp tissue against damage caused by temperature elevations above a certain threshold.