Objective: To evaluate Stage III of the Begg technique using finite element method and to locate the center of rotation (Crot) during torquing and uprighting of the central incisor. Materials and methods: The maxillary central incisor was subjected to a finite element study. Movement of the tooth along the z-axis (labiolingual) and X-axis (mesiodistal) was noted. The Crot was located by finding...

INTRODUCTION The aim of this paper was to study the effect of transmandibular distraction on the periodontal and dental structures, and the initial movements of the mandibular halves, when using an axial plane non-rigid bone-borne distractor (TMD). MATERIAL AND METHODS Fourteen patients undergoing bimaxillary transverse osteodistraction had their six lower anterior teeth assessed for mobility...

The crown-root fracture is a common tooth injury which compromises the biological width and need proper endodontic and prosthodontic treatment to achieve acceptable clinical outcome. This case report describes clinical management of crown-root fracture in maxillary central incisors which was successfully treated by forceps eruption with 180 ̊ rotation to restore the biological width. The patient...

Vibration based monitoring techniques are widely adopted for monitoring the condition of rotating machinery. However, in the case of wind turbines the measured vibration is complex due to the high number of vibration sources and modulation phenomenon. Signals are generated by tooth meshing, shaft rotation, gearbox resonance vibration signatures and a substantial amount of noise. Therefore, extr...

All normal lines of a helical developable Φ have the same distance to its axis a and make the same angle with a . This implies that on coaxial one-sheet hyperboloids of revolution or skew ruled helical surfaces with generators included in the normal-congruence of Φ any orthogonal trajectory of the rulings is located on a translate of Φ . Let line n be the normal of the helical developable Φ at ...

Liquid crystalline molecules carrying photopolymerizable end groups absorb photon energy via a two-photon process, enabling the photofabrication of 3D structures. In this work, we prepared microgears with different heights and tooth lengths. These birefringent microgears can be induced to rotate by circularly polarized light. Here, we demonstrate that the use of phase plate for switching betwee...

 Latching MEMS angular positioning stages have been constructed by deep reactive ion etching and undercut of bonded silicon-on-insulator. Rotation is powered by a primary linear drive acting on a tangential drive pin attached to a passive stage. The approach is extensible to other tilt axes using inserted components. The linear stage is driven by buckling electrothermal actuators. Latching is ...

Objective: The maxillomandibular complex's counterclockwise movement with maxillary advancement and posterior downward repositioning was considered as one of the most unstable movements in orthognathic surgery. This study examines reliability fixation different plate-screw systems grafted nongrafted models rotation where maxilla is positioned anteriorly movement. Material Methods: Stress distri...

The aim of this paper is to optimize the working parameters arc-shaped nail-tooth roller-type recovery machine for sowing layer residual film. Firstly, tooth roller device film designed, and main affecting operation value range each parameter are determined through analysis process. Secondly, virtual simulation technology used establish a model interaction process between soil. At same time, ta...

this paper reports multidisciplinary treatment of a dental trauma case to achieve a favorable prognosis. a healthy 14-year-old girl reported avulsion of teeth 11 and 21 which had occurred three months earlier. the initial treatment consisting of replantation with a semi-rigid splint was performed in hospital. at presentation, the patient was still using the semi-rigid splint. the clinical exami...