Prevalence of Oral Exostoses in Northern China During the Past Six Millennia-From a Sex and Age Perspective.

This study is intended to investigate oral exostoses of 5 sample populations, spanning over 6000 years, from the same region of Northern China, to determine the significance of sex and age on the development of oral exostoses during each time period. The samples analyzed were 306 dry jaws from human skeletons, which were excavated from 4 archeological sites: Banpo (6700-5600 y BP), Shaolingyuan (3000 y BP), Shanren (2200 y BP), and Chang'an (1000-1300 y BP), as well as the modern Xi'an district. The sex and the age of the samples at death were estimated.

The frequency and distribution of caries among the Iron Age population (about 2200 years BP) buried in the Mausoleum of Emperor Qinshihuang.

Objectives: The purpose of this study was to assess the prevalence, distribution, and intensity of dental caries in the Iron Age population of northern China in order to increase knowledge about the type of food, dietary habit, and social stratification in this Iron Age people.

Materials And Methods: The samples analyzed were dental remains of 1548 permanent teeth from 69 male individuals unearthed from the Qin archaeological site of Emperor Qinshihuang's Mausoleum in Lintong (northern China). The sex and the age-at-death of the samples were estimated.

[DNA extraction and sex determination for human teeth dated 3000 years ago unearthed in Xi'an].

Objective: To extracted DNA from ancient human teeth dated 3000 years ago unearthed in Xi'an and determine the genders for the individuals.

Methods: Thirty five ancient human teeth were studied. A 'Reverse-root-canal' technique and a Chelex-100 solution were used to extract the DNA.

Dens invaginatus in ancient Chinese teeth of 2,000 years ago.

Dens invaginatus (DI) is a developmental anomaly of teeth. Here we observed the characteristics of DI in 517 permanent teeth from 67 ancient Chinese people using micro-computed tomography (micro-CT) scanning techniques. The individuals were excavated from Shaanxi province of China and identified to be about 2,000 years old.

Analysis of the biomechanical feasibility of a wide implant in moderately atrophic maxillary sinus region with finite element method.

Objective: The aim of this study was to evaluate the biomechanical feasibility of a short wide implant in a moderately atrophic posterior maxilla.

Study Design: A normal maxillary posterior section with a standard screwed implant (model 1) and a moderately atrophic maxillary posterior section with a short wide screwed implant (model 2) were created. The maximum von Mises stresses in maxilla and the maximum displacements in the implant-abutment complex were evaluated.

Variability in permanent tooth size of three ancient populations in Xi'an, northern China.

Objectives: This paper compares permanent dental dimensions between three ancient populations that belonged to the same biological population throughout a temporal range of 2000 years to detect temporal trends and metric variation in dentition.

Materials And Methods: The samples analysed were dental remains of 4502 permanent teeth from 321 individuals, which were excavated from three archaeological sites: Chang'an (1000-1300 years BP), Shanren (2200 years BP) and Shaolingyuan (3000 years BP) in the Xi'an region (northern China). For each tooth three standard measurements were taken: Mesiodistal (MD) diameter of crown, labiolingual or buccolingual (BL) diameter of crown and length of root (LR).

[Study of alveolar bone defects reparation by combination of bone marrow stromal cells and fibrin glue].

Objective: To explore the effects and feasibility of the repairing alveolar bone by combination of bone marrow stromal cells (BMSCs) and fibrin glue (FG).

Methods: BMSCs were obtained from the sucking mouse and then separated, cultured to the second generation to get ready for use. The available cells were combined with FG and then immediately implanted into the defect that had been established in one lateral maxilla of 30 SD rats.

Prevalence of dental caries and tooth wear in a Neolithic population (6700-5600 years BP) from northern China.

Objectives: The purpose of this study was to assess the prevalence, distribution and intensity of dental caries as well as tooth wear in Neolithic population of northern China to increase our knowledge about the type of food, dietary habit and social stratification in this Neolithic population.

Materials And Methods: The samples analysed were dental remains of 1007 permanent teeth from 79 adult individuals, who were excavated from three Yangshao archaeological sites in the Xi'an district and adjacent Counties (northern China). The sex and the age-at-death of the samples were estimated.

[Dental caries found in the human skull of Tang dynasty excavated fron Xi'an].

Objective: To investigate the status of dental caries in the human of Tang dynasty.

Methods: All teeth in 62 human skulls of Tang dynasty excavated from the Chang'an county in Xi'an city were examined and analyzed by statistics. The difference of prevalence in different group including age, sex and tooth position was tested with Chi-square test.