您的位置:外语教育网 > 医学英语 > 专业词汇 > 正文


2006-01-14 00:00   我要纠错 | 打印 | 收藏 | | |

    Occlusal wear - loss of enamel on the biting surface of the teeth due to the abrasive action of chewing natural unprocessed food.

    Odontoblast process - the extension of the cy lasm of an odontoblast which remains surrounded by dentine during tooth formation. The process is still an active part of the cell and contributes to the production of intratubular dentine in response to ageing, tooth wear or arrested caries.

    Odontoblasts- cells lining the dental pulp, derived from the dental papilla wich form the dentine of the tooth crown and root. New odontoblasts may become differentiated from less specialised pericytes in the pulp.

    Occlusal interference - contact between opposing teeth during chewing, which prevents the other teeth touching. In extreme lateral and protrusive positions of the jaw, this would happen in most dentitions and be of no concern. When occlusal interference occurs close to the area of maximum tooth contact, it may be troublesome.

    Oncogenes - genes which have the capacity if expressed to cause tumour formation.

    Organelle - a structures within a cell which has a specific structure or function, such as thenucleus, endoplasmic reticulum, golgi apparatus, lysosomes and mitochondria.. Cell organelles are a feature of eucaryotic cells.

    Osmotic pressure - Water tends to move towards dense concentrations of ions. Sugar solutions on the surface of exposed dentine cause water to be drawn out of the dentinal tubules causing which distorts the odontoblast causing pain.

    Osseous integration - a term used to describe the desired adhesion between an implant and the bone which holds it in place.

    Osteoblasts - cells which differentiate from pericytes and secrete both the matrix and mineral of bone.

    Osteocalcin - a calcium binding protein, synthesised by the osteoblast and secreted into the matrix at the time of bone mineralisation. Mice bread without the osteocalcin gene develop heavy bones suggesting that osteocalcin is a negative regulator of bone formation

    Osteoclast - a multi-nucleate cellcapable of removing both the organic and mineral component of bone. Osteoclasts activity is controlled by nearby osteoblasts.

    Osteoid - the extracellular matrix inwhich bone forms. It is high in collagen and other bone proteins but lacks any crystal formation.

    Osteonectin - a bone glycoprotein which has the property of binding to both collagen fibres and the hydroxyapatite crystals, and thus may be important in initiating bone mineralisation by acting as a template for nucleation. Osteonectin is also produced by endothelial cells and plateletes and is able to bindfibrinogen.

    Osteopontin - an adhesive glycoprotein related to sialoproteins, which is secreted by osteoclasts to assist in their adhesion to the bone surface. After bone resorption it may then act as a signal to stimulate osteoblast activity

    Osteoporosis - a reduction in bone mass which occurs commonly in post menopausal females, but also in older men. It is due to a reduction in the activity of the ovaries and a decreased secretion of oestrogen. Bone formation and bone healing are not affected but more bone is resorbed by osteoclasts than is replaced. Lack of exercise is also a factor in bone loss.

    Oxytalin fibres - are related to elastic fibres, though they have a smaller core of elastin. They are found in the periodontal ligament and in the epidermis of thin skin, but not in the oral mucosa.

 四六级 指南 动态 经验 试题 资料  托福 指南 动态 经验 留学 备考
 雅思 指南 动态 机经 经验 辅导  公共英语 指南 动态 备考 试题 辅导
 日语 就业 辅导 留学 考试 报考  法语 资料 文化 考试 留学 辅导
 韩语 入门 口语 阅读 留学 文化  西语 辅导 资料 考试 留学 风采





公司下属13家行业远程教育网站,业务涵盖了会计、法律、医学、建设、自考、成考、考研、中小学、外语、信息技术、汉语言教学等诸多领域,拥有办公面积8000多平米,员工近千人,公司年招生规模达270万人。由于正保远程教育(China Distance Education Holdings Ltd., CDEL)在中国互联网远程教育行业内的绝对优势和强大影响力,正保教育模式一直被广大投资人所追捧。2008年7月30日,公司在美国纽约证券交易所正式挂牌上市(股票交易代码:DL),是2008年唯一一家在美国纽交所上市的专业从事互联网远程教育的中国企业。

   1、凡本网注明 “来源:外语教育网”的所有作品,版权均属外语教育网所有,未经本网授权不得转载、链接、转贴或以其他方式使用;已经本网授权的,应在授权范围内使用,且必须注明“来源:外语教育网”。违反上述声明者,本网将追究其法律责任。