Analise fotoelastica da distribuição de tensões produzida na mandibula pela simulação do esforço mastigatorio em sobredentaduras muco-dento-suportadas e protese total

AUTOR(ES)
DATA DE PUBLICAÇÃO

1997

RESUMO

The aim of this study was to verify the distribution of masticatory efforts on jaws under overdentures and complete denture. Three jaws of photoelastic material were made from double impression modelling technique of a edentulous human jaw. The molds were poured with photoelastic resin PLM-4 (Photolastic Inc., Raleigh, USA) in a fluid fase inside an oven by 105°C, where after a long cure process the photoelastic models were obtained. A variation of roots disposition were made on jaws, separating them in three groups; group I, without roots, it was the control group; group II, bilateral disposition of roots in the dental arch corresponding of two canines; group III, one canine and a molar root disposed at the same hemi-arch, in a unilateral situation. Conventional complete denture and overdentures were made over these jaws and it qcluded to a acrilic cast fixed in a semi-adjustable articulator for the loading aplication (20 N). After the "stress fteezing", the models were cutted off in its median line and analised on a transmission polariscope (Photolastic Inc., Raleigh, USA). Thoughout the photoelastic franjes analysis in previous marqued points on the parts, it can be concluded: 1) All the photoelastic models (group I, II and III) showed different patterns os stress distribution. 2) Group I showed a gread concentration os stress in all over the residual ridge. 3) Group II were the best in idstribuition os stress, when compared with the other groups. The high concentration os stress at the root apex, decreased its concentration for all edentulous region of the arch. 4) IN group III effort concentration was observed at the roots apex and also in the edentulous region

ASSUNTO(S)

tensão - concentração fotoelasticidade

ACESSO AO ARTIGO

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