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...

Objective: The purpose of the current study was to evaluate clinical, radiographic and mounted study cast assessment of the abutment on designing of fixed partial denture. Patient & method: The present study was limited to patients who treated by postgraduate students of Conservative Department, School of Dentistry/Faculty of Medical Sciences between January 2014 to February 2015. A total numbe...

A three-dimensional finite element model was created to analyze the influence of periodontal ligament (PDL) fibers on orthodontic tooth movement. Parametric studies were performed to ascertain the importance of fiber Young's modulus and orientation on the locations of the centers of rotation and resistance of a single-rooted tooth under a mesio-distal orthodontic load. If the Young's modulus is...

Numerous apex locator studies have been performed. Generally, they use only stainless-steel hand files for testing purposes. Today many clinicians use both stainless-steel and nickel-titanium files during the treatment of a case. Given the widespread use of nickel-titanium files, a comparison of the accuracy in determining length with an apex locator using stainless-steel and nickel-titanium fi...

introduction: determination of the canal working length with radiographs has many drawbacks. electronic apex locators have been developed to overcome some of these problems. recently, a newly designed apex locator called novapex has been introduced. all the studies conducted to determine the accuracy of novapex have been carried out in-vitro on extracted teeth. the aim of this in vivo study was...

ALPHONSE R. BURDI and JEROME SUPERSTINE Department of Anatomy (Medical School) and School of Dentistry, University of Michzgan, Ann Arbor, Michigan 48109, USA J Dent Res 56(12): 1468, December 1977. deciduous and permanent dental arches, raw order Early prenatal development of human dentitions correlations indicate a moderate association (r = through the classical stages of tooth development ca...

Tooth size and arch dimensions are hereditary factors that play a role in the occurrence of crowding teeth. The purpose this study was to determine difference tooth between This type research is an observational with cross sectional approach. sample consisted two groups. dental model, which 36 pairs each group. results showed total mesio-distal width maxillary anterior teeth (45.95 mm 48.26 mm)...

Objectives Root resorption is a dangerous side effect in orthodontics, and maxillary incisors are at the highest risk for root resorption. It is important to understand optimal force considerations for patients with altered root lengths.The purpose of this study was to investigate the effects of root length on stress distribution on roots by means of three dimensional fi...