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首页> 外文期刊>Journal of oral rehabilitation >Thin-wall ceramic CAD/CAM crown copings: strength and fracture pattern.
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Thin-wall ceramic CAD/CAM crown copings: strength and fracture pattern.

机译：薄壁陶瓷CAD / CAM冠形顶盖：强度和断裂样式。

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The strength and fracture pattern of posterior CAD/CAM-generated crown copings with 0.4 mm wall thickness were evaluated in vitro hypothesizing that fracture resistance of YTZP-zirconia copings might be independent of mode of cementation whether resin-bonded or cemented because of the high strength of YTZP-zirconia. Two sets of copings (n = 15) each were fabricated using CEREC inLab CAD/CAM from (i) lithiumdisilicate glass-ceramic, (ii) infiltration ceramic as controls and (iii) YTZP-zirconia. Copings (n = 15) of ceramics (i), (ii) and (iii) each were (a) zinc-phosphate cemented, (b) adhesively seated on resin-based composite dies and loaded until fracture. Load (N) data was analysed using anova and Scheffe tests. Crack pattern was evaluated on additional three sample cross-sections for each group at fracture-start. Radial cracks originated early at the cementation interfaces and cone cracks were observed finally at the loading sites. Mean load (N) values (+/-s.d.) of A-copings at fracture-start/-end (i) 804 +/- 195/862 +/- 162, (ii) 923 +/- 180/975 +/- 147, (iii) 697 +/- 110/1607 +/- 145, were all significantly (P < 0.01) lower when compared with their B-crown coping analogs (i) 1183 +/- 318/1919 +/- 326, (ii) 1621 +/- 165/1820 +/- 211, (iii) 731 +/- 115/1973 +/- 287 except for A3 and B3 at fracture-start. This confirmed our hypothesis at fracture-start (P > 0.05) but rejected it at fracture-end (P < 0.01). The A3 fracture-end data, even if significantly (P < 0.01) lower, came close to the B3 values by 18%. A3 was significantly (P < 0.001) stronger by 86/74% than A1/A2 at fracture-end. The data indicates that YTZP-zirconia copings have the potential to provide support for all-ceramic core crowns, which may be adequate for non-adhesive cementation.
机译：体外评估了壁厚为0.4 mm的后CAD / CAM产生的冠状冠的强度和断裂模式，假设YTZP-氧化锆冠的抗断裂性可能与胶结方式无关，无论是树脂粘结还是胶结都是因为强度高YTZP-氧化锆。使用CEREC inLab CAD / CAM，由（i）二硅酸锂玻璃陶瓷，（ii）渗透陶瓷作为对照和（iii）YTZP-氧化锆制成两组顶盖（n = 15）。陶瓷（i），（ii）和（iii）的顶盖（n = 15）分别是（a）磷酸锌胶合的，（b）粘接地固定在树脂基复合模具上并加载直至断裂。使用方差分析和Scheffe测试分析了载荷（N）数据。在断裂开始时，对每组的另外三个样品横截面评估裂缝模式。径向裂纹起源于胶结界面，最后在加载部位观察到锥形裂纹。断裂开始/结束时A型套管的平均载荷（N）值（+/- sd）（i）804 +/- 195/862 +/- 162，（ii）923 +/- 180/975 + / -147（iii）697 +/- 110/1607 +/- 145与B-crown应对类似物相比均显着降低（P <0.01）（i）1183 +/- 318/1919 +/- 326 ，（ii）1621 +/- 165/1820 +/- 211，（iii）731 +/- 115/1973 +/- 287，但断裂开始时为A3和B3。这证实了我们在断裂开始时的假设（P> 0.05），但在断裂结束时拒绝了我们的假设（P <0.01）。即使骨折端的A3数据显着降低（P <0.01），也接近B3值18％。在骨折端，A3明显比A1 / A2强（P <0.001）86/74％。数据表明，YTZP-氧化锆顶盖有潜力为全陶瓷芯冠提供支撑，这对于非粘性胶结可能就足够了。

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