Influence of different flask types on teeth displacement in complete upper dentures / Influencia de diferentes tipos de muflas na movimentação de dentes de proteses totais superiores

AUTOR(ES)
DATA DE PUBLICAÇÃO

2010

RESUMO

The aim of this study was to verify the influence of different flask types in the teeth displacement after processing standardized complete dentures in long cycle of polymerization in water bath (9 hours at 74°C). Thirty-one superior and thirty-one inferior stone casts of an edentulous arch were poured with type III stone, from a silicone matrix. One superior cast was mounted in a semi-adjustable articulator with wax rim height of 20 mm in anterior region and 10 mm in the posterior, and then the inferior cast was mounted too. After teeth wax-up, silicone matrix were made with laboratory silicone to enable the reproduction of the same wax-up pattern. The dentures were assigned randomly in 3 groups (n=10): Traditional flask, Double Flask and HH flask with teeth in occlusion. Before flasking reference pins were placed in standardized places and the distances between incisive (I-I), pre-molars (P-P), molars (M-M), left incisor to left molar (LI-LM) and right incisor to right molar (RI-RM) were measured in an optical microscope with 0.0005 mm accuracy. After polymerization, these distances were re-measured and the data obtained was statistical analyzed trough paired t-test, ANOVA and Holm-Sidak, all with 95% of confidence level. It was found statistical differences among P-P (p=0.003 for double flask; and p<0.001 for HH flask) and M-M (p=0.006 for traditional flask; p=0.005 for double flask; and p<0.001 for HH flask). When compared, it was found statistical differences among pre-molars (p=0.011) where conventional flask showed minor differences than HH flask (p=0.003). All flask types used in this study presents statistical differences in at least one of the measured distances, being that traditional flask showed better results

ASSUNTO(S)

complete dentures acrylic resins resinas acrilicas protese dentaria completa

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