Evaluation of the crowns of the upper first and third molars in upper second molar extraction cases / Avaliação das coroas dos primeiros e terceiros molares superiores, nos tratamentos com extrações de segundos molares superiores

AUTOR(ES)

REGINALDO CÉSAR ZANELATO

DATA DE PUBLICAÇÃO

2005

RESUMO

This current research study aims at evaluating the position of the crowns of permanent upper first and third molars, after spontaneous outburst of third molars into the position of extracted second molars with orthodontic purpose, comparing them to the permanent upper first and second molars in a sample of natural normal occlusion. The experimental sample comprised 25 leukoderm subjects, with average age of 15.6 years of age at the beginning of treatment, being 17 female subjects and 8 male subjects, being treated with extraction of upper second molars. The control sample comprised 60 subjects from both sexes, with average age between 12 and 21 year of age, presenting natural normal occlusion. It was evaluated the angulation, tipping and the mesiodistal width of the dental crowns of the first molars and the third molars of the treated group, and the first molars and the second molars of the control group. The difference in height of the dental crowns between the two groups was also evaluated. It was found that in the treated cases the mean value of the mesiodistal angulation and the mean value of the buccolingual inclination of the crowns of the upper first molars and the upper third molars were statistically different from the mean values of the mesiodistal angulation and the buccolingual inclination of the crowns of the upper first molars and upper second molars in the sample of natural normal occlusion. It was verified that just the mesiodistal width of the crowns of the upper third molars showed to be significantly smaller than the crowns of the upper second molars in the sample of natural normal occlusion for both the female and the male subjects. The mean value of the difference in height between the crowns of the first molars and the third molars in the experimental group and the crowns of the first molars and the second molars in the control group was 1.1mm, showing no difference between the groups. Sexual dimorphism was found in the values of the mesiodistal width of the dental crowns of the upper first molars in the control and in the experimental groups, in the mesiodistal width of the dental crowns of the upper second molars in the control group and in the buccolingual tipping of the crowns of the upper third molars in the experimental group. Further evaluations presented no sexual dimorphism.

ASSUNTO(S)

odontologia - teses e dissertações ortodontia ortodontia molares

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