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首页> 外文期刊>The Journal of Prosthetic Dentistry >Evaluation of the marginal fit of a zirconia ceramic computer-aided machined (CAM) crown system.
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Evaluation of the marginal fit of a zirconia ceramic computer-aided machined (CAM) crown system.

机译：评估氧化锆陶瓷计算机辅助加工（CAM）牙冠系统的边缘配合。

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STATEMENT OF PROBLEM: The marginal fit of crowns is a concern for clinicians, and there is no conclusive evidence of any one margin configuration yielding better results than others in terms of marginal fit. PURPOSE: The purpose of this study was to evaluate the marginal fit with respect to gap and overhang of Y-TZP (yttria-stabilized tetragonal zirconia polycrystals) ceramic crowns and compare them with lithium disilicate pressable and complete metal crowns. The influence of margin configuration on the marginal fit was also evaluated. MATERIAL AND METHODS: Impressions were made of premolar dies prepared with shoulders or chamfers with a 20-degree total occlusal convergence (n=30). Type IV stone dies were then distributed into test groups (n=10) for the fabrication of Cercon Y-TZP, IPS Empress II, and complete metal (noble type IV alloy) crowns. The crowns were then subjected to marginal gap and overhang evaluation at 6 designated margin locations using a computerized digital image analysis system. The data were calculated and statistically analyzed using 2-way ANOVA and Bonferroni post hoc tests (alpha=.05). RESULTS: The overall mean (SD) marginal gap at the marginal opening for the crowns was 66.4 (42.2) mum for Cercon, 36.6 (32.1) mum for IPS Empress II, and 37.1 (22.3) mum for complete metal (control). Overall mean (SD) overhang was -15.2 (47.5) mum for Cercon, -22.1 (34.7) mum for IPS Empress II, and 30.9 (31.3) mum for complete metal (control). The ANOVA revealed significant effects by material and no significant effects by marginal configuration for marginal gap. There were significant differences in the marginal overhang values between the 2 margins, but no significant differences were found between the material groups for overhang. CONCLUSIONS: The Cercon system showed significantly larger (P<.05) marginal gaps than both the IPS Empress II and complete metal (control) crowns, but no significant differences were found in marginal overhang among the 3 material groups. There was no significant difference in marginal gap between the 2 margin configurations, namely, chamfer and shoulder, for all test groups; however, there were significant differences (P<.05) in marginal overhang values between chamfer and shoulder margins.
机译：问题陈述：牙冠的边缘吻合是临床医生关注的问题，并且没有确凿的证据表明就边缘吻合而言，任何一种边缘构型都比其他边缘构形产生更好的结果。目的：本研究的目的是评估与Y-TZP（氧化钇稳定的四方氧化锆多晶体）陶瓷牙冠的间隙和悬垂有关的边缘配合，并将其与可压制的二硅酸锂和完整的金属牙冠进行比较。还评估了边缘配置对边缘拟合的影响。材料与方法：印象是用磨牙前肩或倒角制备的前磨牙模具，其总咬合度为20度（n = 30）。然后将IV型石材模具分配到测试组（n = 10）中，以制造Cercon Y-TZP，IPS Empress II和完整的金属（IV型贵金属）牙冠。然后使用计算机数字图像分析系统在6个指定的边缘位置对冠进行边缘间隙和悬垂评估。使用2通ANOVA和Bonferroni事后检验（alpha = .05）对数据进行计算和统计分析。结果：冠的边缘开口处的总体平均（SD）边缘间隙对于Cercon为66.4（42.2）毫米，对于IPS Empress II为36.6（32.1）毫米，对于完全金属（对照）为37.1（22.3）毫米。 Cercon的总体平均（SD）突出量为-15.2（47.5）毫米，IPS Empress II的总体平均（SD）突出为-22.1（34.7），完全金属（对照）的突出率为30.9（31.3）。方差分析显示材料的显着影响，边缘间隙的边际构型没有显着影响。 2个边距之间的边际突出值存在显着差异，但突出的材料组之间没有发现显着差异。结论：Cercon系统显示的边缘间隙比IPS Empress II和完整金属（对照）冠都大（P <.05），但是在3个材料组之间的边缘悬垂方面没有发现显着差异。对于所有测试组，两个边缘配置（即倒角和肩部）之间的边缘间隙没有显着差异。但是，倒角和肩部边缘之间的边沿悬垂值存在显着差异（P <.05）。

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