A computational model of a planetary gear set is employed to study the influence of surface wear on the dynamic behavior of a typical planetary gear set. The overall computational scheme combines a wear model that defines geometric description of contacting gear tooth surfaces having wear and a deformable-body dynamic model of a planetary gear set. The wear model employs a quasi-static gear con...

Based on the gearing theory, calculation formulas of comprehensive curvature radius, relative sliding speed and tooth surface contact stress internal external meshing gear pair planetary system are deduced in this paper. Combined with load sharing theory thermal elastohydrodynamic lubrication analysis method, oil film thickness, bearing ratio friction coefficient solved effects roughness input ...

Prosthetic-restorative approach for the restoration of tooth wear. Case report Objective. This article presents a case report of combined prosthetic-adhesive rehabilitation in a patient with a generalized tooth wear. Methods. A combined treatment adhesive prosthetic was proposed to a male patient of 65 years old having a clinically significant tooth wear, with dentine exposure and with a reduct...

A 61-year old Chinese female was referred from a general private practitioner for persistent buccal abscess after completion of root canal treatment tooth 37. On clinical examination, 37 presented with metal-ceramic crown (CMC) 2mm gingival recession noted at the region. The overlying amalgam core overhanging on distal and grade 2 mobility. CMC have no contact point distal. Tooth not tender to ...

UNLABELLED Prosthetic-restorative approach for the restoration of tooth wear. Case report OBJECTIVE This article presents a case report of combined prosthetic-adhesive rehabilitation in a patient with a generalized tooth wear. METHODS A combined treatment adhesive - prosthetic was proposed to a male patient of 65 years old having a clinically significant tooth wear, with dentine exposure an...

Tooth root crack is considered as one of the crucial causes of failure in the gearing system and it occurs at the tooth root due to an excessive bending stress developed in the root region. The modern power transmission gear drives demand high bending load capacity, increased contact load capacity, low weight, reduced noise and longer life. These subsequent conditions are satisfied by the aid o...

The wear of star wheel teeth is an importance issue in the single screw compressor. In order to enhance the wearresistance of star wheel teeth, some new profiles of the meshing pair were proposed to replace the currently used straight line envelope profile, such as single column envelope, multi-straight line (or multi-column) envelope. In this paper, a curved surface of the tooth flank is sugge...

This paper presents a static model for novel movable tooth drive with logarithmic spiral profiles, to research contact force and load distribution during the meshing period. According geometric properties of conjugate their compatibility law considering multi-tooth elastic effect are investigated reveal characteristic teeth. The mechanism is thus developed systematically analyze variation in ri...

Ectodermal organs, such as the tooth, salivary gland, hair, and mammary gland, develop through reciprocal epithelial-mesenchymal interactions. Tooth morphologies are defined by the crown width and tooth length (macro-morphologies), and by the number and locations of the cusp and roots (micro-morphologies). In our current study, we report that the crown width of a bioengineered molar tooth, whic...