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首页> 外文期刊>The Journal of Prosthetic Dentistry >Analysis of flexural strength and contact pressure after simulated chairside adjustment of pressed lithium disilicate glass-ceramic
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Analysis of flexural strength and contact pressure after simulated chairside adjustment of pressed lithium disilicate glass-ceramic

机译：压制锂硅酸盐玻璃 - 陶瓷模拟椅子侧梁膜膜玻璃 - 陶瓷弯曲强度及接触压力分析

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Statement of problemResearch evaluating load-to-failure of pressed lithium disilicate glass-ceramic (LDGC) with a clinically validated test after adjustment and repair procedures is scarce. PurposeThe purpose of this in?vitro study was to investigate the effect of the simulated chairside adjustment of the intaglio surface of monolithic pressed LDGC and procedures intended to repair damage. Material and methodsA total of 423 IPS e.max Press (Ivoclar Vivadent AG) disks (15 mm diameter, 1 mm height) were used in the study. The material was tested by using an equibiaxial loading arrangement (n≥30/group) and a contact pressure test (n≥20/group). Specimens were assigned to 1 of 14 groups. One-half was assigned to the equibiaxial load test and the other half underwent contact pressure testing. Testing was performed in 2 parts, before glazing and after glazing. Before-glazing specimens were devested and entered in the test protocol, while after-glazing specimens were devested and glazed before entering the test protocol. Equibiaxial flexure test specimens were placed on a ring-on-ring apparatus and loaded until failure. Contact pressure specimens were cemented to epoxy resin blocks with a resin cement and loaded with a 50-mm diameter hemisphere until failure. Tests were performed on a universal testing machine with a crosshead speed of 0.5 mm/min. Weibull statistics and likelihood ratio contour plots determined intergroup differences (95% confidence bounds). ResultsBefore glazing, the equibiaxial flexural strength test and the Weibull and likelihood ratio contour plots demonstrated a significantly higher failure strength for 1EC (188 MPa) than that of the damaged and/or repaired groups. Glazing following diamond-adjustment (1EGG) was the most beneficial post-damage procedure (176 MPa). Regarding the contact pressure test, the Weibull and likelihood ratio contour plots revealed no significant difference between the 1PC (98 MPa) and 1PGG (98 MPa) groups. Diamond-adjustment, without glazing (1EG and 1PG), resulted in the next-to-lowest equibiaxial flexure strength and the lowest contact pressure. After glazing, the strength of all the groups, when subjected to glazing following devesting, increased in comparison with corresponding groups in the before-glazing part of the study. ConclusionsA glazing treatment improved the mechanical properties of diamond-adjusted IPS e.max Press disks when evaluated by equibiaxial flexure and contact pressure tests.
机译：在调整和修复程序后，在临床验证的测试中评估压制锂钠玻璃陶瓷（LDGC）的载荷失效的研究表明。目的的目的是在体外研究中探讨了模拟席位调整整体压制的LDGC的凹版表面的效果和旨在修复损坏的程序。在研究中使用了423 IPS E.Max压力机（IVoClar Viemadent Ag）磁盘（IVoclar Vievadent Ag）磁盘（直径为15毫米，1mm高）的材料和方法。通过使用偏心装载装置（n≥30/组）和接触压力测试（n≥20/组）来测试材料。标本被分配给14组的1个。一半被分配到偏心载荷试验和其他一半接触的接触压力测试。在玻璃窗之前，在玻璃窗之前进行测试。在玻璃之前，在测试方案中缺乏并进入测试方案，而在进入测试方案之前，玻璃釉面标本被剥夺并釉面。将偏心弯曲试样置于环形齿圈装置上并加载直至发生故障。将接触压力标本用树脂水泥固化到环氧树脂嵌段，并装有50mm直径的半球直至发生故障。在通用测试机器上进行测试，其十字头速度为0.5mm / min。威布尔统计和似然比轮廓图确定了互动差异（95％的置信度限制）。结果玻璃窗玻璃玻璃纤维玻璃纤维强度试验和Weibull和似然比轮廓图表现出比受损和/或修复的群体的1EC（188MPa）的失效强度显着更高。钻石调整之后的玻璃（1GG）是最有益的后损伤后程序（176 MPa）。关于接触压力试验，XPC（98MPa）和1PGG（98MPa）组之间没有显着差异。钻石调整，没有玻璃窗（1EG和1PG），导致了距离最低的偏斜弯曲强度和最低接触压力。在玻璃后，所有群体的强度在玻璃上饲养玻璃时，与研究前一部分的相应组相比，增加。结论玻璃玻璃处理改善了通过赤型弯曲和接触压力测试评估时钻石调整的IPS E.MAX压盘的机械性能。

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