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Since considerable shrinkage stress develops during the curing of dental composites, various soft-start photocuring protocols, aiming to lower stress but not compromise conversion, have been proposed. We hypothesized that utilizing soft-start photocuring will result in not only reduced stress, but also decreased conversion. We evaluated the impact of 3(More)
OBJECTIVE This study investigates the effect of cure rate on the mechanical properties of a common dimethacrylate dental resin formulation (75/25 wt% bis-GMA/TEGDMA). METHODS The polymerization rate and final conversion of the exact specimens subsequently used for mechanical testing were monitored by near-infrared (near-IR) spectroscopy. The glass(More)
The accurate and reliable characterization of the polymerization shrinkage stress is becoming increasingly important, as the shrinkage stress still is a major drawback of current dimethacrylate-based dental materials and restricts its range of applications. The purpose of this research is to develop a novel shrinkage stress measurement device to elucidate(More)
—A split-band directly modulated fiber optical CATV system employing −1 side-mode injection-locked and semiconductor optical amplifier (SOA)-based optical single sideband (SSB) modulation techniques is proposed and experimentally demonstrated. For our proposed systems, it is relatively simple to implement as only one SOA is required. Excellent performances(More)
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