introduction:there are conflicting reports on the effects of surgical removal of impacted mandibular third molars on the periodontium of the adjacent teeth. the aim of this study was to compare the condition of the periodontium six months after extraction of impacted mandibular third molars with baseline values. methods: fifty patients with mesioangular impacted mandibular third molarsparticipa...

introdouction:tooth eruption is recognized as an important aspect of human growth and development. it can be influenced by a number of factors, and it may reflect the general development of a child’s body. the purpose of this study was to determine the age at which the first primary tooth erupted and its relationship with height, weight and head circumference in 3-15-month children in the city ...

Introduction Regenerating a tooth completely in human oral cavity is not achieved by current studies yet. Here, we have conceived a man-induced method to construct a teeth germ which might be used to regenerate a tooth in vivo. This idea was generated by traits of the development of the compound odontoma, a benign tumour of tooth malformation. This is a kind of developmental tooth malformation,...

Microscopic roughness is inevitable on the gear meshing surface, which also a key parameter affecting dynamic response. The surface exhibits self-affine characteristics across multiscales. To explore influence of fractal topography vibration amplitude system under different rotational speeds and loads, an experimental setup spur transmission devised. dimension are calculated by power spectral d...

Gingival biotype is described as the thickness of gingiva in faciopalatal or faciolingual dimension. Aesthetic highly con-sidered anterior teeth. A 35-year-old woman came with a complaint that color her front teeth was slightly dark after root canal treatment 10 years ago. Clinical and radiographic examinations upper left lateral incisor showed no signs inflammation infection. Biotype evaluatio...

The tooth is an ectodermal organ that arises from a tooth germ under the regulation of reciprocal epithelial-mesenchymal interactions. Tooth morphogenesis occurs in the tooth-forming field as a result of reaction-diffusion waves of specific gene expression patterns. Here, we developed a novel mechanical ligation method for splitting tooth germs to artificially regulate the molecules that contro...

The influence of the dynamic wear model considering tooth contact flash temperature on characteristics a gear-bearing system is studied. Firstly, meshing stiffness model, based theory, established. Then, changing surface and in process gear analyzed. Next, initial calculated Archard Finally, effects wear, friction factors, damping ratio response are results show that with increase fractal dimen...

BACKGROUND Tooth replacement rate can be calculated in extinct animals by counting incremental lines of deposition in tooth dentin. Calculating this rate in several taxa allows for the study of the evolution of tooth replacement rate. Sauropod dinosaurs, the largest terrestrial animals that ever evolved, exhibited a diversity of tooth sizes and shapes, but little is known about their tooth repl...