Introduction: Etiology of dental crowding may be related to arch constriction in diverse dimensions, and an appropriate manipulation of arch perimeter by intervening in basal bone discrepancies cases, may be a key for crowding relief, especially when incisors movement is limited due to underlying pathology, periodontal issues or restrictions related to soft tissue profile. Objectives: This c...

BACKGROUND The aim of this study was to investigate possible links between competitive swimming during the growth phase and the development of the dentoalveolar arches. METHODS The study sample included 100 swimmers and a control group of 100 age-matched non-swimmers who had never practised swimming or related sports. Subjects who had had previous orthodontic treatment were excluded. Overjet,...

Background The arterial Switch operation (ASO) is now performed routinely for the repair of transposition of the great arteries (TGA). Neo-aortic root dilatation and reduced elasticity of the ascending aorta have been shown to impact the long-term outcomes of these patients. The aim of this study was to assess the effect of the ASO with the Lecompte maneuver on the dynamic behavior and dimensio...

Medical investigation included angiotomography (May 23, 2005) which revealed enlargement of the mediastinum due to a bulky aneurysm in the thoracic aorta in its arch and descending portion, measuring 9 cm in transversal diameter and 7 cm in length, as well as mural thrombosis and an aneurysm at the thoracoabdominal junction with dimensions of 5 cm by 4 cm. Bilateral pleural effusions were detec...

ge Can the transverse dimensions of the dental arches be widened in a stable fashion over the long term? This question continues to challenge clinicians and researchers. Most orthodontists cite the correction of crossbite as the primary reason for altering the transverse dimension with rapid maxillary expansion (RME). A less obvious but more common orthodontic problem, whose etiology in part is...

In this paper, optimal design of arch dams is performed under frequency limitations. Colliding Bodies Optimization (CBO), a recently developed meta-heuristic optimization method, which has been successfully applied to several structural problems, is revised and utilized for finding the best feasible shape of arch dams. The formulation of CBO is derived from one-dimensional collisions between bo...