2015年 · 第50卷第05期

The evolution of human beings in China lasted for 2 million years, and went through three stages: Homo erectus (ape man), early Homo sapiens (ancient man) and late Homo sapiens (new man). So far, Homo erectus found in China lived 1.7 million to 200,000 years ago, and the fossil specimens include Yuanmou Man, Lantian Man, Yunxian Man, Beijing Man, Hexian Man, Nanjing Tangshan Man, etc. Early Homo sapiens (ancient Homo sapiens) lived 300,000~100,000 years ago, and human fossils included Maba Man, Changyang Man, Jinniushan Man, Chaoxian Man, Xuchang Man, Dali Man, Xujiayao Man, etc. Late Homo sapiens (anatomically modern man) dates back 100,000 to 10,000 years ago, including Liujiang people, Zhoukoudian Tianyuan Cave people, Zhoukoudian Mountain Cave people, Guangxi Chongzuo people, Ziyang people, etc. Homo erectus, early Homo sapiens, and late Homo sapiens all gathered and hunted for a living, using more primitive stone tools, so the era in which they lived is collectively called the Paleolithic. About 10,000 years ago, when human beings entered the New Time Age, the ancient residents began to settle in farming life, and their physical characteristics are no different from those of modern residents. After the Neolithic Age, mankind entered the history of civilization, and Xia Dynasty was the first dynasty to enter the history of civilization.

Clinically, it is often seen that the posterior tooth cusp defect has not yet injured the pulp. The cusp defect is located in the occlusal stress area, and conventional resin bonding restoration is easy to collapse. However, full crown or inlay restoration requires extensive tooth preparation. The author used fiber tape combined with direct resin filling technique to repair the posterior tooth with cusp defect, and the clinical restoration effect was observed and evaluated.

centric relation (CR) is the only relationship between maxillary and mandibular positions that can be recovered after a large number of tooth loss, so it has important reference value in restorative treatment to determine the relationship between maxillary positions^[1,2]。 However, a questionnaire survey of teachers and students at seven U.S. colleges and universities showed that there was no consensus on the definition of a positive relationship^[3]。 The relationship between orthodontics and TMD is one of the hot topics in orthodontics research because there are a lot of reports about the median relationship in the study of temporomandibular disorders (TMD). Therefore, the orthodontics at home and abroad have paid special attention to the median relationship in recent years^[4]。 Now we will use orthodontic means to build the relationship between the right and the middleTalk about my personal opinion.