PDF(Pubmed)
Abstract：
OBJECTIVE: This study assessed the effects of 15% and 20% carbamide peroxide (CP) on color, surface roughness, and hardness of computer-aided design/computer-aided manufacturing (CAD/CAM) dental ceramics.
METHODS: This in vitro study was conducted on 120 Vita Mark II, Celtra Duo, and Suprinity CAD/CAM ceramic specimens. The ceramic specimens in each group (n = 40) were randomly assigned to two subgroups (n = 20) for polishing and glazing, and their baseline color, surface roughness (Ra), and hardness were assessed. In each subgroup, half of the specimens were exposed to 15% CP, while the other half were exposed to 20% CP. Their color change (ΔE), surface roughness, and hardness were then measured again. Surface roughness, hardness, and color were analyzed sequentially by profilometer, Vickers hardness tester, and spectrophotometer, respectively. Data were analyzed by repeated measures ANOVA, one-way ANOVA, and post hoc Bonferroni test (α = 0.05).
RESULTS: The surface roughness of all groups significantly increased after bleaching treatment (p < 0.05). Surface hardness of all groups decreased after bleaching treatment, but this reduction was only significant in Vita Mark II subgroups (glazed, polished, 15%, and 20% CP). The ΔE was not clinically and visually perceivable in any group.
CONCLUSIONS: The present results revealed that concentration of CP and type of surface treatment affected the surface properties of CAD/CAM ceramics. Type of surface treatment only affected the surface hardness of Vita Mark II ceramics (p < 0.05). Concentration of CP had a significant effect only on polished Vita Mark II.
METHODS: This in vitro study was conducted on 120 Vita Mark II, Celtra Duo, and Suprinity CAD/CAM ceramic specimens. The ceramic specimens in each group (n = 40) were randomly assigned to two subgroups (n = 20) for polishing and glazing, and their baseline color, surface roughness (Ra), and hardness were assessed. In each subgroup, half of the specimens were exposed to 15% CP, while the other half were exposed to 20% CP. Their color change (ΔE), surface roughness, and hardness were then measured again. Surface roughness, hardness, and color were analyzed sequentially by profilometer, Vickers hardness tester, and spectrophotometer, respectively. Data were analyzed by repeated measures ANOVA, one-way ANOVA, and post hoc Bonferroni test (α = 0.05).
RESULTS: The surface roughness of all groups significantly increased after bleaching treatment (p < 0.05). Surface hardness of all groups decreased after bleaching treatment, but this reduction was only significant in Vita Mark II subgroups (glazed, polished, 15%, and 20% CP). The ΔE was not clinically and visually perceivable in any group.
CONCLUSIONS: The present results revealed that concentration of CP and type of surface treatment affected the surface properties of CAD/CAM ceramics. Type of surface treatment only affected the surface hardness of Vita Mark II ceramics (p < 0.05). Concentration of CP had a significant effect only on polished Vita Mark II.
摘要：
目的：本研究评估了15％和20％过氧化脲（CP）对颜色的影响，表面粗糙度,计算机辅助设计/计算机辅助制造（CAD/CAM）牙科陶瓷的硬度。
方法：这项体外研究是在120VitaMarkII上进行的，CeltraDuo,和SuprinityCAD/CAM陶瓷试样。每组（n=40）的陶瓷试样被随机分配到两个亚组（n=20）进行抛光和上釉，和它们的基线颜色，表面粗糙度(Ra),和硬度进行了评估。在每个子组中，一半的标本暴露于15%的CP，而另一半暴露于20%CP。它们的颜色变化(ΔE)，表面粗糙度,然后再次测量硬度。表面粗糙度,硬度,用轮廓仪依次分析颜色，维氏硬度计,和分光光度计，分别。数据通过重复测量方差分析，单向方差分析,和事后Bonferroni检验(α=0.05)。
结果：漂白处理后，所有组的表面粗糙度均显着增加（p<0.05）。漂白处理后各组表面硬度均有所下降,但这种减少仅在VitaMarkII亚组中显著(釉面，打磨,15%,和20%CP)。在任何组中，ΔE均无法在临床和视觉上感知。
结论：目前的结果表明，CP的浓度和表面处理类型会影响CAD/CAM陶瓷的表面性能。表面处理类型仅影响VitaMarkII陶瓷的表面硬度（p<0.05）。CP的浓度仅对抛光的VitaMarkII有显著影响。
方法：这项体外研究是在120VitaMarkII上进行的，CeltraDuo,和SuprinityCAD/CAM陶瓷试样。每组（n=40）的陶瓷试样被随机分配到两个亚组（n=20）进行抛光和上釉，和它们的基线颜色，表面粗糙度(Ra),和硬度进行了评估。在每个子组中，一半的标本暴露于15%的CP，而另一半暴露于20%CP。它们的颜色变化(ΔE)，表面粗糙度,然后再次测量硬度。表面粗糙度,硬度,用轮廓仪依次分析颜色，维氏硬度计,和分光光度计，分别。数据通过重复测量方差分析，单向方差分析,和事后Bonferroni检验(α=0.05)。
结果：漂白处理后，所有组的表面粗糙度均显着增加（p<0.05）。漂白处理后各组表面硬度均有所下降,但这种减少仅在VitaMarkII亚组中显著(釉面，打磨,15%,和20%CP)。在任何组中，ΔE均无法在临床和视觉上感知。
结论：目前的结果表明，CP的浓度和表面处理类型会影响CAD/CAM陶瓷的表面性能。表面处理类型仅影响VitaMarkII陶瓷的表面硬度（p<0.05）。CP的浓度仅对抛光的VitaMarkII有显著影响。
