As the most important working area of gear, teeth play the role of transmitting load and power. Tooth line and tooth profile are the two main characteristics of the tooth surface, which affect the shape of the tooth surface, tooth meshing characteristics and contact characteristics. Taking the elliptical cylinder gear pair in the reversing device of a new type of drum pumping unit as the resear...

Pathological, non-carious loss of tooth tissue is an increasing problem to the dental profession, with young individuals especially at risk. This paper provides an overview of the problem with an emphasis on the possible causes, particularly those factors which may account for the increased incidence. The clinical appearance produced by the various aetiological factors is discussed and recommen...

The aim of this study, is to use finite element simulation to achieve the optimal geometry of a broaching tool that creates the lowest tensile stress at the machined surface of the Ti6Al4V alloy. It plays a major role in reducing production costs and improves the surface integrity of the machined parts. The type and amount of residual stress determined by the thermal and mechanical loads transm...

some children of borazjan area have minute white flecks, yellow or brown spot areas scattered irregularly over the tooth surface, the causative factor was attributed to excess of fluoride in water. to verify this matter short chemical examination of water samples from endemic area was carried out. the results of water analysis by colorimetric method, using zirconium a1izarin reagent after disti...

the growing demand for enhanced esthetic appearance has led to great developments in bleaching products. the exposure of hard tissues of the tooth to bleaching agents can affect the roughness of the enamel surface. the freshly bleached enamel surface exposed to various surface treatments such as fluoride and other remineralizing agents have been assessed in this study. the aim of this experimen...

The aim of the study was to evaluate factors involved in tooth surface loss due to consumption of dried-roasted seeds. Data of tooth surface loss were collected from a group of 141 patients by clinical examination, interview and by getting the questionnaire regarding dietary factors, oral hygiene practices and pregnancy (for women) filled. No significant differences in tooth surface loss were f...

In order to study the dynamic meshing characteristics of the elliptic cylinder gear and obtain the meshing error of the gear transmission system, the two-dimensional static contact analysis of the gear tooth surface is carried out by using ANSYS software, and the key parts of the contact area of the tooth surface are determined. Then, the dynamic meshing model of the elliptic cylinder gear is e...

Aim:To compare the bacterial level in tooth surface by pre brushing and post brushing using herbal and fluoridated toothpaste Objectives: This study is done to compare the bacterial level using herbal and fluoridated toothpaste. Tooth surface swab is collected. Background: Toothpaste has been manufactured throughout for the reduction in the bacterial level. The present study will be done to com...

Distinguished with some basic theory and approaches of traditional tooth surface design, the spiral bevel gear with new tooth surface, namely spherical involute tooth surface, is investigated. Firstly, it improved its formational principle based on the spherical involute theory. As a key part, the parametric equation of the generating line was made a detailed derivation. To this end, fast and a...