■这项研究的目的是比较使用CAD-CAM从改性聚醚醚酮(PEEK)材料生产的后芯与其他定制生产的后芯的断裂强度和断裂模式。
■使用了60个具有相等根大小的人类下颌第一前磨牙。牙齿分为六组(n=10),并进行根管治疗。牙齿与牙釉质交界处的根部分离超过2mm。作为装饰过程的结果,所有牙齿均获得1毫米宽的肩线。对于断裂强度试验,用1.6mm直径的钻机在牙齿上产生10mm深的支柱空间。后核心组包括:everStick®玻璃纤维后核心(GF组),氧化锆后芯(Z组),金属(Cr-Co)后芯(M组),不含填料的PEEK后芯(UP组),含20%TiO2填料的PEEK后芯(TP组),和含20%陶瓷填料的后芯(CP组)。在将帖子应用于帖子空间之后,在样品上创建并胶合。有了万能测试仪,以135°的斜率向牙齿的长轴施加力。使用单因素方差分析对组间的平均断裂强度(N)进行统计学评估,使用事后Tukey的HSD检验检测各组之间的成对平均值差异。
■根据统计分析的结果,两组的平均抗骨折能力有显著差异(p<0.05)。Z组(409.34±45.72)明显高于UP组(286.64±37.79),CP(298.00±72.30),TP(280.08±67.83)。M组(376.17±73.28)明显高于UP组(286.64±37.79)和TP组(280.08±67.83)。其他各组之间的均值差异无统计学意义(p>0.05)。在所有的群体中,Z组表现出更高的可修复故障模式患病率,而其他组主要经历不可修复的故障模式。
■在我们的研究中,氧化锆和金属后岩心样品显示出比PEEK后岩心组更高的平均断裂强度值。可修复的失效模式在氧化锆后芯中更为常见,而在其他组中观察到相反的情况。在将PEEK材料用作临床后材料之前,还需要进一步的实验和临床试验研究。
UNASSIGNED: The aim of this
study was to compare the fracture strength and fracture modes of post-cores produced with CAD-CAM from modified polyetheretherketone (PEEK) materials with other custom-produced post-cores.
UNASSIGNED: Sixty human mandibular first premolars with equal root sizes were used. The teeth were divided into six groups (n = 10), and root canal treatment was performed. The teeth were separated from the roots over 2 mm from the cemento-enamel junction. As a result of the decoronation process, a 1 mm wide shoulder line was obtained for all teeth. For the fracture strength test, 10 mm deep post spaces were created on the teeth with a 1.6 mm diameter driller. Post-core groups consisted: everStick® glass fiber post-core (Group GF), zirconia post-core (Group Z), metal (Cr-Co) post-core (Group M), PEEK post-core without filler (Group UP), PEEK post-core with 20% TiO2 Filler (Group TP), and post-core with 20% ceramic filler (Group CP). Following the application of posts to post spaces, copings were created and cemented on the samples. With the universal tester, a force was applied to the long axis of the tooth with a slope of 135°. The mean fracture strength (N) between the groups was statistically evaluated using one-way ANOVA, and pairwise mean differences were detected using post hoc Tukey\'s HSD test among the groups.
UNASSIGNED: According to the results of the statistical analysis, a significant difference was found between the groups in terms of mean fracture resistance (p < 0.05). Group Z (409.34 ± 45.72) was significantly higher than Group UP (286.64 ± 37.79), CP (298.00 ± 72.30), and TP (280.08 ± 67.83). Group M (376.17 ± 73.28) was significantly higher than Group UP (286.64 ± 37.79) and Group TP (280.08 ± 67.83). There were no statistically significant differences between the means of the other groups (p > 0.05). Among all the groups, Group Z exhibited a higher prevalence of repairable failure modes, while the rest of the groups predominantly experienced irreparable failure modes.
UNASSIGNED: In our
study, zirconia and metal post-core samples showed higher average fracture strength values than PEEK post-cores groups. Repairable failure modes were more common in the zirconia post-cores, whereas the opposite was observed in the other groups. Further experimental and clinical
trial studies are needed before PEEK materials can be used as post materials in the clinic.