OBJECTIVES The present study examines the influence of cavity type, and size of composite restorations on cuspal flexure due to polymerization shrinkage. METHODS Thirty healthy premolars were selected and divided into two experimental groups. Group 1: Mesial, mesio-distal, and MOD cavities were successively prepared in each tooth by means of the SONICSYS approx system (KaVo) using a n 2 (smal...

This paper presents a micro XY stage that employs electrostatic comb-drive actuators and achieves a bi-directional displacement range greater than 225 μm per motion axis. The proposed XY stage design comprises four rigid stages (ground, motion stage, and two intermediate stages) interconnected via flexure modules. The motion stage, which has two translational degrees of freedom, is connected to...

We present the case of a 23-year-old man who consulted in the emergency department 6 days after ingesting a wooden toothpick with features of a localized peritonitis in the left upper quadrant of the abdomen. Surgical exploration revealed a perforation of the splenic flexure of the colon by the toothpick during its migration. This rare case is analysed in the light of the current literature. Th...

Basaloid squamous carcinoma occurs most commonly in the upper aerodigestive tract. In the colon, the most common location is in the anal canal and is rarely reported proximal to the anal verge. Six cases are reported in the published literature, of which five are located distal to the splenic flexure. Outside the anal canal, it has been postulated that they arise from the basal cells, squamous ...

Equations governing thermoelastic loss in vibrating thin plates are derived, generalizing Zener’s theory of thermoelastic loss in beams. The mechanism for the loss of mechanical energy is thermal diffusion caused by inhomogeneous deformation, flexure in thin plates. It is shown that a critical plate thickness, h∗, exists which separates two distinct types of response, which may be called therma...

The aim of this study was to determine the extent of asymmetry of spinal segment mobility in canoeists. Moreover, the relationship between this parameter and racing speed was analyzed. The study included 18 canoeists with a mean age of 16.4 years. Mobility of cervical, thoracic and lumbar spine, in sagittal, coronal and transverse planes, was measured with the aid of a tensometric electrogoniom...

Loth and Henneberg (1996, Am. J. Phys. Anthropol. 99:473-487) identified a single morphological feature of the mandible, the presence or absence of a distinct flexure or angulation of the posterior margin of the mandibular ramus at the level of the occlusal plane, which appears to be an extraordinarily accurate predictor of sex. Using only this feature, Loth and Henneberg were able to predict s...

A Comb Drive Actuator is a basic actuation device of MEMS. MEMS applications often require large force, large displacement, low-power and energy-efficient actuators. Low power consumption is highly desirable not only for economic reasons, but also for heat generation considerations. In this paper, different types of structural design of Comb Drive Actuator that is Fixed-Fixed Flexure Beam, Crab...

This work deals with the kinematic conception and the mechanical design of ultra-high precision robots, which are at present costly to develop, both in time and money. The aim of this paper is thus to introduce a new modular concept of kinematics which allows to significantly reduce the time-to-market and a new double-stage flexure-based pivot. Regarding the modular concept of kinematics, this ...

Flexure occurs on intermediate geologic timescales (∼1 Myr) due to volcanic-island building at the Island of Hawaii, and deformational response lithosphere is simultaneously elastic, plastic, ductile. At shallow depths low temperatures, elastic deformation transitions frictional failure faults where stresses exceed a threshold value, this complex rheology controls rate manifested by earthquakes...