A method for the determination of the optimal polynomial functions for the conduction of machine-tool setting variations in pinion teeth finishing in order to reduce the transmission errors in spiral bevel gears is presented. Polynomial functions of order up to five are applied to conduct the variation of the cradle radial setting and of the cutting ratio in the process for pinion teeth generat...

This paper presents the investigation into the tooth profile features, meshing characteristics and the principle of forming circular arc tooth race cylindrical gears (CATT gears). Based on the meshing theory of the curvilinear gear, tooth surface equations and meshing line equations of the gears and rack shave been established. The graphical analysis of these equations shows meshing performance...

To avoid edge contact and stress concentration on the tooth surface of hypoid gear pairs machined by duplex helical method for drive axle heavy-duty vehicles, a four-segment tool profile was designed simultaneous modification concave convex surfaces pinion. First, geometric model established. Second, mathematical based established, solving generated connecting points presented. Finally, loaded ...

Microneurographic recordings were obtained from 20 periodontal mechanoreceptive afferents in the inferior alveolar nerve while force profiles of different amplitudes and rates were applied to a premolar or the first molar in the most sensitive direction. The majority of afferents (17/20) showed a hyperbolic relationship between the steady-state discharge rate and the amplitude of the stimulatin...

The aims of this study were to compare the chondroitin sulphate (CS) levels in gingival crevicular fluid (GCF) of moved canines using either 70 or 120 g of orthodontic force, and to compare the rate of tooth movement and the amount of pain between these two force magnitudes. Sixteen patients (6 males and 10 females; aged 16.91 ± 2.99 years), with class I malocclusion, who required orthodontic t...

OBJECTIVES The aim of this study was to assess the clinical outcomes achieved with Computer-Assisted Design/Computer-Assisted Manufacturing implant abutments in the anterior maxilla. MATERIAL AND METHODS Nineteen patients with a mean age of 41 (range form 26 to 63) years, treated with 21 single tooth implants and 21 Computer-Assisted Design/Computer-Assisted Manufacturing (CAD/CAM) abutments ...

Although there are several case reports of vital tooth bleaching in children, there is limited clinical trial evidence of the safety or efficacy of this practice. Accordingly, a new clinical trial was conducted to evaluate the effects of 2 different bleaching systems, a 6.5% hydrogen peroxide strip system and a 10% carbamide peroxide tray system, in a population of preteens and teens. A total o...

Avulsion injuries deal with exarticulation or total luxation of the tooth out of its socket as a result of a blunt impact on the tooth due to contact sports, road accidents or fights which leads to severance of the neurovascular pulpal supply, separation of the PDL and exposure of the root surface (oral/extra-oral environment contaminated with microorganisms) [1,2]. The success of a replanted t...

To promote the engineering application of composite transmission high speed curve face gear, which consists a cylindrical gear and analysis tooth bending stress should be taken into consideration. High pair is new type pair. Combined with principle cam transmission, it can transfer axial/rotation motion power between two intersecting shafts. Based on engagement principle, meshing coordinate sys...