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首页> 外文期刊>The Journal of Prosthetic Dentistry >The effect of multiple firings on the marginal integrity of pressable ceramic single crowns
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The effect of multiple firings on the marginal integrity of pressable ceramic single crowns

机译：多次点火对可压制陶瓷单冠的边缘完整性的影响

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摘要

The marginal adaptation of metal ceramic crowns is affected by firing cycles for veneering porcelain application. The effect of multiple firings on the marginal integrity of pressable ceramic core crowns is unknown. The purpose of this in vitro study was to evaluate the effect of repeated firing cycles on the marginal discrepancy of veneered (layered) pressable ceramic anterior crowns with 2 different finish line configurations. Forty pressable ceramic single anterior complete crowns were fabricated from 2 systems (IPS Empress Esthetic and IPS e.max Press) with 2 finish line designs (shoulder, chamfer) on epoxy resin dies. Specimens were divided into 4 groups of 10, and measurements were made after pressing (control) and after 5 veneer firing stages: 1) wash, 2) first incisal, 3) second incisal, 4) characterization and glazing, and 5) corrective. The change in vertical marginal discrepancy was measured with a light microscope at 4 locations: facial (F), mesial (M), lingual (L), and distal (D) surfaces. One-way ANOVA (α-=.05) was used to evaluate the marginal change. A Student-Newman-Keuls test was also used for comparison among the groups. There were no significant changes in the vertical marginal integrity related to ceramic type and marginal location and their interactions. However, there was a significant marginal integrity change during the characterization and glazing firing stage. (P<.05) The marginal gap increased for both systems during veneer application and decreased during the characterization and glazing firing cycle. The total marginal fit change after 5 firings was 0.33 μm for IPS e.max Press, and 0.27 μm for IPS Empress Esthetic.
机译：金属陶瓷冠的边缘适应性受装饰陶瓷应用的烧成周期影响。多次烧结对可压制陶瓷芯冠的边缘完整性的影响尚不清楚。这项体外研究的目的是评估重复烧制循环对单板（分层）可压制陶瓷前牙冠具有2种不同终点线配置的边缘差异的影响。由2个系统（IPS Empress Esthetic和IPS e.max Press）和2个精整线设计（肩部，倒角）在环氧树脂模具上制成40个可压制的陶瓷单前完整牙冠。将样品分成4组，每组10个，并在压制（对照）和5个单板烧制阶段后进行测量：1）清洗，2）第一切牙，3）第二切牙，4）表征和上光，以及5）校正。使用光学显微镜在四个位置（面部（F），内侧（M），舌侧（L）和远端（D））测量垂直边缘差异的变化。单向方差分析（α-=。05）用于评估边际变化。学生-纽曼-基尔斯测试也用于各组之间的比较。与陶瓷类型和边缘位置及其相互作用有关的垂直边缘完整性没有显着变化。但是，在表征和玻璃烧制阶段，边际完整性发生了显着变化。 （P <.05）在贴面过程中，两个系统的边际间隙均增加，在特征化和玻璃烧成周期中，边际间隙减小。对于IPS e.max Press，5次射击后的总边际拟合变化为0.33μm，对于IPS Empress Esthetic，为0.27μm。

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