Department of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
Dental Biomaterials Research Center, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
J Prosthodont. 2019 Jan;28(1):e285-e289. doi: 10.1111/jopr.12731. Epub 2018 Jan 3.
This study analyzed the effect of different sintering times on the marginal adaptation of zirconia ceramic copings.
Thirty copings of pre-sintered 3Y-TZP blanks were milled and subsequently sintered in a special furnace for three different durations (n = 10 per group). The sintering time was 1 hour, 15 minutes for IPS e.max ZirCAD, 4 hours 20 minutes for Speed ZrO and 7 hours 20 minutes for the conventional ZrO group. The marginal gaps of specimens were measured at 18 spots on the master die by employing a digital microscope. One-way ANOVA test compared the mean differences among the 3 groups (α = 0.05).
The mean values for the marginal gap of the IPS e.max ZirCAD, Speed ZrO , and conventional ZrO groups were 41.06 ± 14.03, 43.03 ± 11.67, and 39.88 ± 15.23 μm, respectively. There was no statistically significant difference among the groups regarding the marginal gap.
Different sintering times did not alter the marginal fit of the zirconia copings. The mean values of the marginal gap were within the clinically acceptable level for all three groups.
本研究分析了不同烧结时间对氧化锆陶瓷全冠边缘适应性的影响。
将 30 个预烧结 3Y-TZP 坯料加工成冠，并在特殊炉中以三种不同时间（每组 10 个）进行烧结。IPS e.max ZirCAD 的烧结时间为 1 小时 15 分钟，Speed ZrO 的烧结时间为 4 小时 20 分钟，传统 ZrO 的烧结时间为 7 小时 20 分钟。使用数字显微镜在主模具上的 18 个点测量试件的边缘间隙。采用单因素方差分析比较 3 组之间的平均差异（α=0.05）。
IPS e.max ZirCAD、Speed ZrO 和传统 ZrO 组的边缘间隙平均值分别为 41.06±14.03μm、43.03±11.67μm 和 39.88±15.23μm。组间边缘间隙无统计学差异。
不同的烧结时间不会改变氧化锆全冠的边缘适合性。三组的边缘间隙平均值均在临床可接受范围内。
