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Digitized study of the correlation between the face and tooth shapes in young adult individuals
Silva, Frederico Augusto Peixoto; de Almeida, Norma Lúcia Freitas; Ferreira, Daniel Filgueiras; Mesquita, Marcelo Ferraz & de Negreiros, Wagner Araújo
Abstract
This study evaluated the clinical validity of the "Williams's
law of harmony" to select artificial teeth in complete dentures,
in which there is a similarity between the face and maxillary
central incisor (MCIs) shapes. Two photographs were taken
(face and MCIs) from 79 students aged 18-25 years, and
digitized using a Genius HR-7 scanner. Face and teeth tracings
were performed from the photographs using a Easy Digitizer
1.2 software. A non-parametric Chi Square test was applied in
the statistical analysis (p<0.05). Results showed a
predominance of the square shape (55.70%) in relation to the
triangular (27.85%) (p<0.01), and the ovoid (16.45%) (p<0.001)
ones. Considering the MCIs shape, the square (67.09%)
predominated in relation to the ovoid (18.99%) (p=0), and the
triangular (13.92%.) (p=0) ones. The analysis among the shapes
showed a lower proportion of identical (10.13%) when
compared with no similar (48.10%) (p=0), and similar (41,77%)
(p<0.001) ones. Authors concluded that the "William's law of
harmony" was not confirmed in the majority of the individuals,
and further studies are necessary to actually define which
theory satisfies the clinical requirements. The clinical
experience and critical sense seem to be more important for a
satisfactory esthetic result.
Keywords
denture, complete, teeth, artificial, esthetics, dental, criteria, selection, forms
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