Three-dimensional comparison of the effects of sliding mechanics in labial and lingual orthodontics using the finite element method.

Introduction: The extraction of maxillary first premolars is usually the treatment of choice to resolve crowding, alveolar protrusion, or Class II malocclusion. The demand for a lingual orthodontic treatment is increasing because of its esthetic value; therefore, understanding lingual biomechanics is essential to every clinician. This study compared the 3-dimensional (3D) effects of sliding mechanics in labial and lingual orthodontics using the finite element method.

Hepatic infantile hemangiomas treated with oral propranolol--a case series.

Hepatic infantile hemangiomas may be associated with morbidity and mortality, and traditional therapies may be associated with significant side effects. Since propranolol has been recently used successfully to treat cutaneous infantile hemangiomas, we decided to use it in three patients who presented with hepatic and skin hemangiomatosis. Three patients with skin and hepatic infantile hemangiomas, two of whom had evidence of cardiovascular compromise and one of whom had extensive liver involvement and hypothyroidism, were treated with oral propranolol.