Evaluation of the accuracy of stone dies obtained from a polyether mould (through shell tecnique) and made by pouring in different times or by successive pourings in a same mould. / Avaliação da fidelidade de troquéis de gesso obtidos de um poliéter (com a técnica do casquete) e confeccionados ou em diferentes momentos ou através de subseqüentes vazamentos num mesmo molde

AUTOR(ES)

Odirlei Arruda Malaspina

DATA DE PUBLICAÇÃO

2005

RESUMO

The accuracy of moulds obtained through shell technique from a polyether (Impregum Soft) was indirectly evaluated, by direct evaluation of the accuracy of stone dies. A standard crown (extremely well fitted to the standard die, both presenting their oclusal portions at the same level) was used to verify the height difference between itself and each obtained Vel-Mix stone die. The condition of stone pouring lend to the name of 5 groups; some moulds were utilized (U) just once time to make a die at 3 different ages, in order to conform respectively groups UO (pouring immediately after its obtention), U1 (1 hour later) and U2 (2 hours later); the others moulds were reutilized (R), in order to conform the groups R1 (reutilized 1 hour after pouring by first time) and R2 (reutilized 2 hours after that first pouring); by analogy, the group UO could also be named RO. To quantify the referred height differences, in micrometers, a depth microscope was used. The ideal result (ideal acuraccy) would be the inexistence of such differences. Statistically treated data allowed to conclude that 1) in all groups, stone dies were allways bigger than the standard die; 2) best results were presented by specimens of groups UO/RO and U1, respectively with height difference of 80,75 and 114.25 micrometers, but without statistically significant difference; 3) groups R1 and R2, worse than the aforementioned, presented a similar performance, respectively with 153.98 and 184.54 micrometers, and 5) worse desajust was detected in group U2, with 323.36 micrometers.

ASSUNTO(S)

moldes dentários poliéteres troquéis de gesso

Documentos Relacionados

• .
• Effect of cervical relining of acrylic resin copings on the accuracy of stone dies obtained using a polyether impression material
• Avaliação da alteração dimensional ocorrida nos terminos cervicais de troqueis confeccionados com gessos tipo IV e tipo V
• Influência de diferentes métodos de desinfecção química nas propriedades físicas de troquéis de gesso tipo IV e V
• Desenvolvimento de membranas de poli(éter imida) sultonada para a permeacão de gases