Gears are commonly used for transmitting power. They develop high stress concentration at the root and the point of contact. The repeated stressing on the fillets causes the fatigue failure of gear tooth. The main objective of this study is to add different shaped holes to reduce stress concentration. A finite element model of Spur gear with a segment of three teeth is considered for analysis a...

BACKGROUND AND AIMS Bruxism is defined as a habitual nonfunctional forceful contact between occlusal tooth surfaces. In younger children bruxism may be a consequence of the masticatory neuromuscular system immaturity. The aim of this study was to assess the prevalence of bruxism and investigate the relationship between occlusal factors and bruxism among preschool children. MATERIALS AND METHO...

Objective: To evaluate and compare the long-term skeletodental stability of mandibular symphyseal distraction osteogenesis (MSDO) achieved with the use of tooth-borne versus hybrid distraction appliances. Materials and Methods: Posttreatment and follow-up orthodontic records were collected for 33 patients. The 14 patients who underwent distraction with a tooth-borne appliance had a mean follow-...

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...

In 13 unloaded living knees we confirmed the findings previously obtained in the unloaded cadaver knee during flexion and external rotation/internal rotation using MRI. In seven loaded living knees with the subjects squatting, the relative tibiofemoral movements were similar to those in the unloaded knee except that the medial femoral condyle tended to move about 4 mm forwards with flexion. Fou...

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 ...

We have reported previously that hearts from type 2 diabetic (db/db) mice show decreased cardiac efficiency due to increased work-independent myocardial O(2) consumption (unloaded MVo(2)), indicating higher O(2) use for nonmechanical processes such as basal metabolism (MVo(2)(BM)) and excitation-contraction coupling (MVo(2)(ECC)). Although alterations in cardiac metabolism and/or Ca(2+) handlin...

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...