BACKGROUND The aim of this study was to compare displacements and stress after en masse retraction of mandibular dentition with lingual and labial orthodontics using three-dimensional (3D) finite element models (FEM). METHODS A 3D FEM of each lower tooth was constructed and located as appropriate to Roth's prescription. The 0.018-in. GAC Roth Ovation labial and Ormco 7th Generation lingual br...

Reaction times (RTs) from human orofacial muscles were obtained with labial displacement and auditory stimuli to evaluate the potential for contributions by these sensorimotor processes to speech movement coordination. Because speech requires both concurrent and sequential movements, intramovement (labial stimulus, labial response) and intermovement (labial stimulus, lingual response) RT minima...

Predicting the effects of labial coarticulation is an important aspect with a view to developing an artificial talking head. This paper describes a concatenation approach that uses sigmoids to represent the evolution of labial parameters. Labial parameters considered are lip aperture, protrusion, stretching and jaw aperture. A first formal algorithm determines the relevant transitions, i.e. tho...

The present study provides new data concerning the morphology and distribution of the labial sensilla of 55 species of 12 nepomorphan families (Heteroptera: Nepomorpha) using the scanning electron microscope. On the labial tip, three morphologically distinct types of chemosensilla have been identified: two types of papillae sensilla and one type of peg-in-pit sensilla. Twenty-one morphologicall...

OBJECTIVE The aim of this study was to investigate whether labial tooth inclination and alveolar bone loss affect the moment per unit of force (Mt/F) in controlled tipping and consequent stresses on the periodontal ligament (PDL). METHODS Three-dimensional models (n = 20) of maxillary central incisors were created with different labial inclinations (5°, 10°, 15°, and 20°) and different amount...

Labial adhesion occurs most often in infants and girls and is usually associated with low estrogen levels. Labial adhesion in the reproductive age group is extremely rare due to abundance of estrogen. Herein we present a case of almost complete labial adhesion with acute urinary retention in a 21-year-old virgin woman secondary to a probable untreated severe vaginitis.

Immediate implant placement in a single staged approach, with or without provisionalization, can be advantageous in preserving gingival anatomy around dental implants. However, placing implants immediately in the changing alveolar bone of an extraction socket may result in progressive recession of the gingival labial margin over the implant restoration. This negative outcome may be overcome wit...