文档介绍：骨水泥知识
介绍
骨水泥是填充物,而非粘合剂.
机械的锁定: 松质骨/骨水泥,骨水泥/假体
CPT类假体可以在骨水泥套中下沉
骨水泥术语:
工作时间/ working time:
低粘和面团期的总和
使用时间/ set time:
从开始混合到骨水泥完全变硬
混合时间/mix time:
粉末和水剂混合后,成为液态物/ 45-90秒.
低粘时间/low viscosity time:
从混合时间末到面团期
面团时间/dough time:
从骨水泥不黏手套始,到变硬/ 通常在混合后3-
由温度,湿度和混合技术决定
这阶段骨水泥必须注射入髓腔
聚和过程
PMMA :Polymethylmethacrylate
聚甲基丙烯酸甲酯
通过聚合的过程, 成为高分子链
主要考虑的因素
操作技巧
影响粘度和使用时间的因素
机械力学因素
病人和医生
操作技巧特点:
Open Bowl Mixing
使用开放式搅拌可减缓骨水泥反应时间
Vacuum Mixing
使用真空泵搅拌可加速骨水泥反应时间
Vacuum promote more free radicals react with MMA
Oxygen can react with free radicals
Osteobond
Osteobond cement stays in a low-viscosity state longer, which has benefit of allowing in less air during mixing and making removal of airs voids easier because of the liquid consistency of the cement
Under standard condition:
Osteobond
Handling
Characteristics
Open Bowl Mixing
Vacuum Mixing
72°F
/22°C
Dough Time
2:45-4:15
2:45-3:45
Working Time
6:15-7:00
5:00-5:15
Set Time
9:00-11:15
7:45-9:00
The time to reach dough state under vacuum with Osteobond
is 45 seconds longer than Simplex(2:00-2:45),
with the set time being the same