Int J Prosthodont. 2024 Jun 21(3):99-111. doi: 10.11607/ijp.8308.
To analyze the microgap changes between hybrid-abutment crowns made of two materials and three internal taper connec9on implants with different connection designs before and after thermodynamic loading.
A total of 30 implants-10 each of Straumann Bone Level Implant-RC (STR); GC AADVA Implant (AAD); and Astra-Tech OsseoSpeed EV (AST)-were included in this laboratory study. Each implant had an internal taper connection, but their designs were slightly different. Five hybrid-abutment crowns were fabricated using a lithium disilicate ceramic (LD), and five were fabricated using polymethylmethacrylate (PMMA) with CAD/CAM technologies for each implant system, providing six sample groups STR-LD, AAD-LD, AST-LD, STR-PMMA, AAD-PMMA, and ASTPMMA. The microgap volume was measured using micro-CT images obtained before and after thermodynamic loading equivalent to 4 months of clinical use. Student t test, one-way ANOVA, and Tukey test were used for comparisons.
The greatest microgap volume increase was recorded (3.405% ± 1.567%) in the AST-LD group, and the lowest increase (0.45% ± 0.373%) was in the STR-PMMA group. A statistically significant difference in microgap increase was not detected among PMMA and LD groups: for STR-LD/STR-PMMA (t test: P = .273); for AAD-LD/AAD-PMMA (t test: P = .374); and for AST-LD/AST-PMMA (t test: P = .268). However, the difference in the microgap increase between the different implant systems was statistically significant.
The microgap between hybrid-abutment crowns and implants increased after short-term thermodynamic cycling. Hybrid-abutment crowns with different elastic modulus showed similar microgap increase. The geometric shape of the connection influenced the microgap increase.
分析两种材料制成的混合基台冠和三种不同连接设计的内锥形连接种植体在热力学负荷前后微间隙的变化。
本实验室研究共纳入 30 个种植体，每个种植体系统各 10 个，包括 Straumann Bone Level Implant-RC（STR）；GC AADVA 种植体（AAD）；Astra-Tech OsseoSpeed EV（AST）。每个种植体都有内锥形连接，但设计略有不同。使用锂硅二酸盐陶瓷（LD）制作 5 个混合基台冠，使用 CAD/CAM 技术制作 5 个聚甲基丙烯酸甲酯（PMMA）基台冠，每个种植体系统提供 6 个样本组 STR-LD、AAD-LD、AST-LD、STR-PMMA、AAD-PMMA 和 AST-PMMA。使用微 CT 图像测量热力学负荷前后（相当于临床使用 4 个月）的微间隙体积。采用 Student t 检验、单因素方差分析和 Tukey 检验进行比较。
在 AST-LD 组中记录到最大的微间隙体积增加（3.405%±1.567%），而在 STR-PMMA 组中增加最小（0.45%±0.373%）。PMMA 和 LD 组之间微间隙增加无统计学差异：STR-LD/STR-PMMA 组（t 检验：P=0.273）；AAD-LD/AAD-PMMA 组（t 检验：P=0.374）；AST-LD/AST-PMMA 组（t 检验：P=0.268）。然而，不同种植体系统之间微间隙增加的差异有统计学意义。
短期热力学循环后，混合基台冠和种植体之间的微间隙增加。具有不同弹性模量的混合基台冠显示出相似的微间隙增加。连接的几何形状影响微间隙的增加。
