Study of the relative factors of cure depths of light curing composite resin

PURPOSE: To investigate the effect of different composite resin, different light curing units, different irradiation time, different irradiation distance on cure depths of light curing composite resin. METHODS: Designed by factorial experiment, 192 Cylindrical samples were made with 4mm internal diameter and 6mm high mold. The whole samples were scanned by Planmeca ProMax panoramic X-ray unit,cure depths were measured using a scoping method described in the ISO standard for resin-based composites. The data was statistically analyzed by SPSS11.5 software package for ANOVA. RESULTS: The differences of four factors-composite resin, light curing units, irradiation time, irradiation distance were significant (P0.01), and the effects between-subjects were involved among four factors (P0.01). CONCLUSIONS: From this study,we conclude that cure depths may be affected by two kinds of light curing units,two kinds of composite resin,four kinds of irradiation time and four kinds of irradiation distances,once each factor is strengthened,cure depths could reach a more ideal effect.Supported by Key Research Project of Science and Technology Committee of Liaoning Province(Grant No.00225001).