Abu-Obaid Ala'a, AlMawash Amjad, Alyabis Noura, Alzaaqi Nouf
Department of Prosthodontic Dental Sciences, Collage of Dentistry, King Saud University, Riyadh, Saudi Arabia.
Collage of Dentistry, King Saud University, Riyadh, Saudi Arabia.
Saudi Dent J. 2020 Mar;32(3):135-141. doi: 10.1016/j.sdentj.2019.08.005. Epub 2019 Aug 28.
To determine the effect of coffee on the stainability of CAD/CAM ceramics after different surface treatment protocols.
Ninety specimens (2 mm × 10 mm) of CAD/CAM ceramic materials (Vitablocs Mark II, VITA Enamic, and VITA Suprinity) were prepared. The specimens were subdivided (n = 10) into three groups: G1: Glazed (control group), G2: Subjected to finishing and polishing, and G3: Re-glazed after finishing and polishing. The surface treatment was performed using a diamond polishing system for porcelain (Diapol) followed by applying a diamond polishing paste (Diapolisher). The specimens were immersed in distilled water for 24 h, and the baseline color measurement after finishing and polishing was recorded. Each group was then immersed in a staining solution (coffee) for one week, and the second color measurement was recorded.
The color of the CAD/CAM ceramic materials in the finishing and polishing groups changed significantly after staining (P < 0.05). Statistically significant differences were noticed after staining in the polished groups of Vita Enamic and Vita Suprinity compared with the glazed group (control). However, the color change between the re-glazed and control groups was insignificant for all the materials (P > 0.05). Although the color change values of the three CAD/CAM materials increased, these changes were within the clinically acceptable value (ΔE < 3.3).
Staining of the tested CAD/CAM ceramic materials increased the color change values within the clinically acceptable range in all the groups, with the highest values found after finishing and polishing. Re-glazing is recommended after surface adjustment for all the tested materials to increase their resistance to staining.
确定咖啡对不同表面处理方案后CAD/CAM陶瓷材料染色性的影响。
制备了90个CAD/CAM陶瓷材料（维他瓷块Mark II、维他全瓷复合树脂和维他臻瓷）样本（2毫米×10毫米）。将样本分为三组（每组n = 10）：G1组：上釉（对照组），G2组：进行精修和抛光，G3组：精修和抛光后再次上釉。使用用于瓷器的金刚石抛光系统（Diapol）进行表面处理，随后涂抹金刚石抛光膏（Diapolisher）。将样本浸入蒸馏水中24小时，记录精修和抛光后的基线颜色测量值。然后将每组样本浸入染色溶液（咖啡）中一周，记录第二次颜色测量值。
精修和抛光组的CAD/CAM陶瓷材料染色后颜色发生显著变化（P < 0.05）。与上釉组（对照组）相比，维他全瓷复合树脂和维他臻瓷的抛光组染色后有统计学显著差异。然而，所有材料再次上釉组与对照组之间的颜色变化不显著（P > 0.05）。尽管三种CAD/CAM材料的颜色变化值有所增加，但这些变化在临床可接受范围内（ΔE < 3.3）。
所有组中，测试的CAD/CAM陶瓷材料染色均使颜色变化值在临床可接受范围内增加，精修和抛光后的值最高。建议对所有测试材料进行表面调整后再次上釉，以提高其抗染色性。
