不同条件煅烧牛骨物理性能差异分析

ANALYSIS OF PHYSICAL PROPERTY FOR BOVINE BONE OF VARIOUS CALCINED CONDITIONS

寻找煅烧牛骨的合适条件，为骨缺损的修复治疗提供一种较理想的异种生物材料。方法：将４０ｍｍ×５ｍｍ×２．５ｍｍ骨条按不同温度、时间进行烩煅烧处理后，进行气孔率、吸水率、体积密度、抗折强度的测定，以及差热分析、材料矿物组成分析。结果：牛煅烧骨的成分为结晶程度不高的羟基磷灰石，煅烧时间和温度以４５０℃，３２小时为较合适，此时气孔率５０．６４％，抗折强度１７．５７Ｍｐａ，低于或高于这种条件则会使其物理性能降低，及残留一定的免疫性。结论：煅烧条件以４５０℃，３２ｈ为宜，该异种生物骨成分为羟基磷灰石，保留了牛骨的原有框架和一定的力学强度，具有潜在的传导性修复骨缺损的能力。

Objective:to seek suitable condition for calcining bovine bone and to provide a kind of good heterologous organic material for repairing bone defect. Methods: bovine bone slices (40mm×5mm×2.5mm) were calcined at various temperature and lasted for various period of time. Then the following properties of the bovine calcined bone slices were tested: porosity rate, hydrophilism, density, bending strength, mineral composition and heat analysis. Results: the major mineral composition of bovine calcined bone was HA of low crystallization. the suitable condition for calcining were the tempreture of 450℃ and lasted for about 32 hours, when the porosity rate of bovine calcined bone was 50.64% and its bending strength was 17.57Mpa. Otherwise, the physical property of bovine calcined bone would be decreased and some immunity would be remained. Conclusion: the suitablecalsined condition was at the temperature of 450℃ for about 32 hours. the major mineral composition of this heterologous organic bone was HA. it retained original frame of bovine bone and some mechanical strength. it has potential capability of repairing bone defect of conductivity.