报告摘要: Hydroxyapatite apatite (HA) is the most important ceramic material for biomedical applications because of its similarity to biominerals in bone and tooth. Ability of HA formation in physiological environments has been considered as a criterion to evaluate bioactivity of materials for dental and orthopedic applications. However, we should ask ourselves how much we know about hydroxyapatite in terms of its crystal structure, phase transformation, and formation in physiological conditions. In fact, another calcium phosphate phase, octacalcium phosphate (OCP) was often mistakenly identified as HA. Formation of biomineral phases may be far complicated than commonly believed. Ability of apatite formation as the bioactivity criterion is also questionable.

Yang Leng博士是香港科技大学机械工程学系的教授。1982年获重庆大学冶金工程专业学士学位；1986年获密歇根理工大学冶金工程专业硕士学位；1989年获美国弗吉尼亚大学材料科学专业博士学位；1989-1991：美国弗吉尼亚大学研究助理；1992-1997：香港科技大学机械工程学系助理教授；1997-2006：香港科技大学机械工程学系副教授；2006-今：香港科技大学机械工程学系教授。Yang Leng教授目前的研究领域包括：生物医学材料、力学行为与微观结构的相关性、新材料加工。近年来他在有影响力的国际期刊上发表文章80余篇，2项专利等。