ผลของการปนเปื้อนน้ำลายเทียมและควันบุหรี่ต่อเสถียรภาพของสีของเรซินซีเมนต์ / สุเธียร อัมพรสิริรัตน์ = The effects of artificial saliva contamination and cigarette smoke on color stability of resin cements
The purpose of this in vitro study was to investigate the effects of artificial saliva contamination and cigarette smoke on color stability of resin cements. The tests were divided into two parts. In first part, Six resin cements (Nexus 3, Variolink Veneer, Superbond C&B, Clearfil SA Cement, Panavia F2.0 and Multilink Speed) were selected for this study. Each product of resin cements was divided into two groups; specimen group that was not contaminated with artificial saliva (N) and specimen group that was contaminated with artificial saliva (S) before polymerization of resin cements. Ten specimen disks of twelve groups were prepared using an acrylic mold. The specimen disks were subjected to accelerated aging for 120 hours. The color was measured before and after accelerated aging by using Spectrophotometer. The results of this part revealed that the artificial saliva contamination did not affect color stability of resin cements. Multilink Speed and Superbond C&B had the most obvious color change, respectively, while Variolink Veneer had the least color change. In second part, ten specimen disks of six resin cements were subjected to continuous smoke of twelve cigarettes at the rate of 1 cigarette/6 min for a total exposure time of 72 minutes. The specimen disks were cleaned with ultrasonic cleaner. The color was measured before smoke exposure (baseline), after smoke exposure, and after ultrasonic cleaning. Color changes were calculated between baseline and after smoke exposure measurements (ΔE12), and between baseline and after ultrasonic cleaning measurements (ΔE13). The results showed that after exposure to cigarette, Most resin cements had perceptible color changes (ΔE12≥3.3) except Clearfil SA Luting and Panavia F2.0. While ultrasonic cleaning could reduce stains from cigarette smoke attached on all tested resin cements (p≤0.05). The knowledge from this study can be a preliminary suggestion for selection of resin cements for esthetic dentistry, and may be used for further research in the future.