Cariology , endodontology and operative dentistry is a science to research the etiology , mechanisms , pathology process , clinical appearance , diagnosis , treatment and prognosis of operative dentistry and dental pulp diseases , all teaching time are hours , adapting to five years students and seven years students of oral subject 牙体牙髓学是研究牙体硬组织和牙髓组织疾病病因、发病机制、病理变化、病理生理、临床表现、治疗及转归的一门科学，总学时，适用于五年制、七年制口腔专业，内容包括基本教学内容和扩展性教学内容。
One of the most common bone substitutes used in clinic is polymethylmethy aery late ( pmma ) . pmma can be described as an alloplastic , synthetic , nonbiodegradable polymer which has considerable versatility . however , a common problem associated with the application of pmma is the loosening 以有机玻璃作为母相，掺入一定比例的羟基磷灰石( ha )粉末，是一种较为有效的改善生物活性的方法，因为羟基磷灰石是人体硬组织的一种无机组分，与骨组织有良好的相容性和亲和力，能诱导其周围骨组织的生长。
