The aim of this study was to evaluate the effect of controlled intraoral grinding and polishing on the roughness of full-contour zirconia compared to classical veneered zirconia. Thirty bar-shaped zirconia specimens w...The aim of this study was to evaluate the effect of controlled intraoral grinding and polishing on the roughness of full-contour zirconia compared to classical veneered zirconia. Thirty bar-shaped zirconia specimens were fabricated and divided into two groups（n515）. Fifteen specimens（group 1） were glazed and 15 specimens（group 2） were veneered with feldspathic ceramic and then glazed. Prior to grinding,maximum roughness depth（Rmax） values were measured using a profilometer, 5 times per specimen. Simulated clinical grinding and polishing were performed on the specimens under water coolant for 15 s and 2 N pressure. For grinding, NTI diamonds burs with grain sizes of 20 mm, 10 mm, and 7.5 mm were used sequentially. The ground surfaces were polished using NTI kits with coarse, medium and fine polishers. After each step, Rmaxvalues were determined. Differences between groups were examined using one-way analysis of variance（ANOVA）. The roughness of group 1 was significantly lower than that of group 2. The roughness increased significantly after coarse grinding in both groups. The results after glazing were similar to those obtained after fine grinding for non-veneered zirconia. However, fine-ground veneered zirconia had significantly higher roughness than venerred, glazed zirconia. No significant difference was found between fine-polished and glazed zirconia, but after the fine polishing of veneered zirconia, the roughness was significantly higher than after glazing.It can be concluded that for full-contour zirconia, fewer defects and lower roughness values resulted after grinding and polishing compared to veneered zirconia. After polishing zirconia, lower roughness values were achieved compared to glazing; more interesting was that the grinding of glazed zirconia using the NTI three-step system could deliver smooth surfaces comparable to untreated glazed zirconia surfaces.展开更多
目的探讨后牙金铂合金全金属颈环烤瓷熔附金属全冠(porcelain fused to metal,PFM)的应用价值。方法选取99例进行后牙金铂合金PFM修复的患者,共修复牙体182颗,其中93颗牙体采用金铂合金PFM全金属颈环羽状肩台设计,89颗牙体采用凹面肩台...目的探讨后牙金铂合金全金属颈环烤瓷熔附金属全冠(porcelain fused to metal,PFM)的应用价值。方法选取99例进行后牙金铂合金PFM修复的患者,共修复牙体182颗,其中93颗牙体采用金铂合金PFM全金属颈环羽状肩台设计,89颗牙体采用凹面肩台设计,戴冠1年和3年后,比较两组设计边缘适应性、牙龈健康状况、继发龋发病率、牙龈染色及稳定性的差异。结果戴冠1年后,两组设计边缘适应性、牙龈健康状况、继发龋发病率及牙龈染色无明显差异。戴冠3年后,后牙金铂合金全金属颈环PFM边缘适合性优的比例(92.47%)高于凹面肩台PFM设计(82.02%);后牙金铂合金全金属颈环PFM造成牙龈病变的比例及继发龋的比例(18.28%和3.22%)低于凹面肩台PFM(34.83%和11.24%);前者牙龈染色的程度重于后者,差异有统计学意义(P<0.05)。后牙金铂合金全金属颈环PFM随着时间推移缘适应性、牙龈健康状况、继发龋发病率无明显变化,而凹面肩台设计PFM的以上指标均向不利方向发展(P<0.05)。结论后牙金铂合金全金属颈环PFM具有良好的边缘适应性、稳定性、较低的牙龈病变的比例及继发龋的比例,但造成牙龈染色的概率较大。后牙金铂合金全金属颈环PFM可作为后牙区修复的一种常规设计方案。展开更多
基金Forschungsgemeinschaft Dental e.V. for supporting this study (project no. 3/2012)
文摘The aim of this study was to evaluate the effect of controlled intraoral grinding and polishing on the roughness of full-contour zirconia compared to classical veneered zirconia. Thirty bar-shaped zirconia specimens were fabricated and divided into two groups（n515）. Fifteen specimens（group 1） were glazed and 15 specimens（group 2） were veneered with feldspathic ceramic and then glazed. Prior to grinding,maximum roughness depth（Rmax） values were measured using a profilometer, 5 times per specimen. Simulated clinical grinding and polishing were performed on the specimens under water coolant for 15 s and 2 N pressure. For grinding, NTI diamonds burs with grain sizes of 20 mm, 10 mm, and 7.5 mm were used sequentially. The ground surfaces were polished using NTI kits with coarse, medium and fine polishers. After each step, Rmaxvalues were determined. Differences between groups were examined using one-way analysis of variance（ANOVA）. The roughness of group 1 was significantly lower than that of group 2. The roughness increased significantly after coarse grinding in both groups. The results after glazing were similar to those obtained after fine grinding for non-veneered zirconia. However, fine-ground veneered zirconia had significantly higher roughness than venerred, glazed zirconia. No significant difference was found between fine-polished and glazed zirconia, but after the fine polishing of veneered zirconia, the roughness was significantly higher than after glazing.It can be concluded that for full-contour zirconia, fewer defects and lower roughness values resulted after grinding and polishing compared to veneered zirconia. After polishing zirconia, lower roughness values were achieved compared to glazing; more interesting was that the grinding of glazed zirconia using the NTI three-step system could deliver smooth surfaces comparable to untreated glazed zirconia surfaces.
文摘目的探讨后牙金铂合金全金属颈环烤瓷熔附金属全冠(porcelain fused to metal,PFM)的应用价值。方法选取99例进行后牙金铂合金PFM修复的患者,共修复牙体182颗,其中93颗牙体采用金铂合金PFM全金属颈环羽状肩台设计,89颗牙体采用凹面肩台设计,戴冠1年和3年后,比较两组设计边缘适应性、牙龈健康状况、继发龋发病率、牙龈染色及稳定性的差异。结果戴冠1年后,两组设计边缘适应性、牙龈健康状况、继发龋发病率及牙龈染色无明显差异。戴冠3年后,后牙金铂合金全金属颈环PFM边缘适合性优的比例(92.47%)高于凹面肩台PFM设计(82.02%);后牙金铂合金全金属颈环PFM造成牙龈病变的比例及继发龋的比例(18.28%和3.22%)低于凹面肩台PFM(34.83%和11.24%);前者牙龈染色的程度重于后者,差异有统计学意义(P<0.05)。后牙金铂合金全金属颈环PFM随着时间推移缘适应性、牙龈健康状况、继发龋发病率无明显变化,而凹面肩台设计PFM的以上指标均向不利方向发展(P<0.05)。结论后牙金铂合金全金属颈环PFM具有良好的边缘适应性、稳定性、较低的牙龈病变的比例及继发龋的比例,但造成牙龈染色的概率较大。后牙金铂合金全金属颈环PFM可作为后牙区修复的一种常规设计方案。
