ABSTRACT
PURPOSE: The purpose of this study was to compare temperature rises in the pulp chamber induced by halogen, plasma arc, and conventional light-emitting diode (LED) curing units with that induced via a new generation LED-curing unit (VALO) in extra power mode. METHODS: A Class I cavity was prepared on the occlusal surface of 80 extracted caries- free mandibular third molars, which were filled with a microhybrid composite. A thermocouple wire was inserted into the pulp chamber of each tooth to measure temperature changes. RESULTS: The greatest temperature increases were observed during polymerization of composite resin with a halogen curing unit (3.2 degrees Celsius), followed by plasma arc curing (2.07 degrees Celsius) and VALO curing (1.44 degrees Celsius); the lowest temperature rise was with conventional LED curing (1.01 degrees Celsius). CONCLUSION: There were no statistically significant differences between conventional LED and VALO curing in extra power mode regarding pulp chamber temperature increases when polymerizing composite resin.
Subject(s)
Composite Resins/chemistry , Curing Lights, Dental , Dental Pulp Cavity/radiation effects , Light-Curing of Dental Adhesives/instrumentation , Humans , In Vitro Techniques , Molar, Third , Polymerization , TemperatureABSTRACT
OBJECTIVE: The aim of this study was to evaluate the impact of several aspects of climate, such as temperature and altitude, on dental maturation. MATERIALS AND METHODS: The total sample consisted of 944 panoramic radiographs (473 Turkish children from Central Anatolia [228 girls and 245 boys] and 471 Turkish children from Eastern Anatolia [222 girls and 249 boys]). The children aged between 7.0 and 14.9 years. The radiographs were randomly selected from 2 cities in Turkey, Kayseri and Erzurum. Independent t tests and paired t tests were performed to compare sex, location, and age to determine the relationships between tooth developments. RESULTS: The Central Anatolian children were approximately 0.2 to 3.0 years more advanced in dental maturity than the Eastern Anatolian subjects. CONCLUSIONS: The development standards proposed by Demirjian are affected by climatic factors. However, further research and detailed information to gather data are needed.