Toothed gears are the most common mechanical in machine building, which characterized by high reliability and durability, a constant transfer number, can transmit torque. During toothed gear operation, surfaces of teeth slide, gives rise to friction forces wears their working surfaces. To prevent this, need lubrication. This paper considers design tooth engagement, does not have between since t...

Abstract A notable proportion of class II population suffer from excessive vertical maxillary growth which leads to subsequent backward rotation of mandible. Excessive tooth show at rest and on smile are the associated presentation of this group.we report  treatment results of this subdivision of class II patients, treated by high pull headgears attached to maxillary acrylic splints with po...

The aim of this study was to evaluate the movement of anterior teeth during retraction with a force applied through the assumed centre of resistance (CRe).Twenty-two subjects with a Class I or II malocclusion were included. Each subject had the two upper first premolars extracted, resulting in a symmetrical extraction space of at least 3 mm between the upper laterals and canines. The force was ...

This study investigated the early effects on mandibular incisor irregularity and rotation together with dental arch dimensions of the extraction of four deciduous canines. Children, during early mixed dentition, were randomized into one extraction (n = 32) and one control (n = 41) group. Dental casts from baseline (T0) and 1 year follow-up (T1) were used to evaluate changes in the irregularity ...

background: the accuracy and reproducibility of measurements in a locally made three dimensional (3d) simulator was assessed and compared with manual caliper measurements. materials and methods: a total of 20 casts were scanned by our laser scanner. software capabilities included dimensional measurements, transformation and rotation of the cast as a whole, separation and rotation of each tooth ...

Congenital anomalies pose a huge threat to the affected and susceptible individuals significantly impair their lives. In addition, congenital dental are also serious issue can be associated with certain complications. It has been shown development of these disorders might found as single disorder or part another systemic syndrome. The present literature review provides an overview anomalies. Di...