The jaw bones are the most common sites for epithelial cysts and tumors in the human skeleton due to their close relationship to the tooth and odontogenesis. Most of these cysts and tumors have in common an origin fro...The jaw bones are the most common sites for epithelial cysts and tumors in the human skeleton due to their close relationship to the tooth and odontogenesis. Most of these cysts and tumors have in common an origin from the tissues of tooth formation and constitute a very diverse group of lesions that reflects the complex development of the dental structures. This group of odontogenic lesions occurs predominantly in the jaws, with a predilection for young people. Some aggressive lesions have attracted much attention as they often produce marked facial deformity and tend to recur after insufficient surgery. The most widely quoted classification of odontogenic tumors is that proposed in the WHO booklet published in 1992. There are, however, a number of controversial issues that need to be addressed with respect to clinicopathological subtypings, terminology, and diagnosis which all have direct bearings on therapeutic and/or prognostic implications. In the light of recent publication of the WHO new classification and a series of related studies undertaken by the author’s group, this paper is to put together an overview on some of these important aspects related to unicystic ameloblastoma, clear cell odontogenic tumor, calcifying odontogenic cyst, odontogenic keratocyst, ameloblastic fibroma and its related lesions. Consequent upon a better understanding of the nature of these tumors and their variants, the various treatment protocols currently recommended by different surgeons will be better rationalized.展开更多
The Science Citation Index (SCI) was introduced primarily as a method of information retrieval but has alsobeen used as an objective measure of the quality of an academic article. The SCI also provides the scientific ...The Science Citation Index (SCI) was introduced primarily as a method of information retrieval but has alsobeen used as an objective measure of the quality of an academic article. The SCI also provides the scientific communitywith a citations database indicating the number of cited references in indexed articles. In fact the impact factor is awidespread used and acknowledged source for judging the quality of a researcher. For several reasons, the SCI seems to bemore relevant. Because of this importance, there have been many pros and cons regarding the feasibility and potentialutility of the SCI as a mean of academic evaluation in the Chinese scientific community. Overall, China’ s share in theworld scientific literature is much less than that of many other countries. Data on the observed citation impact of Chineseresearch in different fields, including medicine, show that the work done in China in general is not integrated well intointernational research. This article intended to introduce some basic aspects with respect to the SCI and to present apersonal view on its role as an international stage of academic merit.展开更多
唇腭裂（cleft lip and palate）是一种常见的面裂畸形[1]。其中,25%~75%的患者由于颌骨的先天发育不足、后天生长异常、早期手术影响等因素造成继发性上颌骨畸形。这类畸形的特点主要有：在上颌骨高度、深度、宽度不足的同时,常伴有复...唇腭裂（cleft lip and palate）是一种常见的面裂畸形[1]。其中,25%~75%的患者由于颌骨的先天发育不足、后天生长异常、早期手术影响等因素造成继发性上颌骨畸形。这类畸形的特点主要有：在上颌骨高度、深度、宽度不足的同时,常伴有复杂的颌骨形态缺陷,如牙槽嵴裂、口鼻瘘、前颌骨游离等。展开更多
文摘The jaw bones are the most common sites for epithelial cysts and tumors in the human skeleton due to their close relationship to the tooth and odontogenesis. Most of these cysts and tumors have in common an origin from the tissues of tooth formation and constitute a very diverse group of lesions that reflects the complex development of the dental structures. This group of odontogenic lesions occurs predominantly in the jaws, with a predilection for young people. Some aggressive lesions have attracted much attention as they often produce marked facial deformity and tend to recur after insufficient surgery. The most widely quoted classification of odontogenic tumors is that proposed in the WHO booklet published in 1992. There are, however, a number of controversial issues that need to be addressed with respect to clinicopathological subtypings, terminology, and diagnosis which all have direct bearings on therapeutic and/or prognostic implications. In the light of recent publication of the WHO new classification and a series of related studies undertaken by the author’s group, this paper is to put together an overview on some of these important aspects related to unicystic ameloblastoma, clear cell odontogenic tumor, calcifying odontogenic cyst, odontogenic keratocyst, ameloblastic fibroma and its related lesions. Consequent upon a better understanding of the nature of these tumors and their variants, the various treatment protocols currently recommended by different surgeons will be better rationalized.
文摘The Science Citation Index (SCI) was introduced primarily as a method of information retrieval but has alsobeen used as an objective measure of the quality of an academic article. The SCI also provides the scientific communitywith a citations database indicating the number of cited references in indexed articles. In fact the impact factor is awidespread used and acknowledged source for judging the quality of a researcher. For several reasons, the SCI seems to bemore relevant. Because of this importance, there have been many pros and cons regarding the feasibility and potentialutility of the SCI as a mean of academic evaluation in the Chinese scientific community. Overall, China’ s share in theworld scientific literature is much less than that of many other countries. Data on the observed citation impact of Chineseresearch in different fields, including medicine, show that the work done in China in general is not integrated well intointernational research. This article intended to introduce some basic aspects with respect to the SCI and to present apersonal view on its role as an international stage of academic merit.
文摘唇腭裂（cleft lip and palate）是一种常见的面裂畸形[1]。其中,25%~75%的患者由于颌骨的先天发育不足、后天生长异常、早期手术影响等因素造成继发性上颌骨畸形。这类畸形的特点主要有：在上颌骨高度、深度、宽度不足的同时,常伴有复杂的颌骨形态缺陷,如牙槽嵴裂、口鼻瘘、前颌骨游离等。
