Avaliação das propriedades mecânicas de atadura gessada de três diferentes fabricantes, utilizada para confecção de órteses

Abstract

SUMMARYMechanical tests have been performed in plaster bandages used in orthosis supplied by three different manufacturers. For this, bodies of evidence (BOEs) were made with plates and cylinders shapes. BOEs were submitted to two kinds of mechanical assays: for the plate group, a flexion assay was performed at three points, and, for the cylinder group, a compression assay was performed. Mechanical assays were performed on the Universal Assay Machine EMIC ® . Three mechanical properties were assessed after assays: maximum limit load, proportional limit load and stiffness. Results show that a manufacturer was superior over the others for the properties assessed.

Influence of the number of layers of paris bandage plasters on the mechanical properties speciments used on orthopedic splints

“…To obtain specimens with standard dimensions, custom-made moulds were prepared at our local precision workshop (Universidade de São Paulo, Ribeirão Preto Campus, SP, Brazil). Additionally, three basic aspects were controlled to guarantee standardization: immersion of all plaster bandages in room temperature water for 3 to 5 seconds, construction of all specimens by a single operator and plaster drying time before mechanical testing of 72 hours 23 . Each group of specimens were divided into 6 subgroups according the number of layers of plaster of Paris bandages used: 3, 6, 8, 10, 12 and 14 layers.…”

A simple idea for reducing the cost and weight of plaster-cast orthoses

“…An EMIC DL500 test machine was used, with a load cell of capacity 200 kg and advancing velocity of 50 mm/min. The machine was activated until reaching plaster cast deformation of 30 mm, in a manner very similar to a flexion test that was performed to test the quality of three different brands of plaster, which was published in Ata Ortopédica Brasileira in 20061 (Fig. 3).…”

Desenvolvimento no Brasil de termoplásticos de baixa temperatura para órteses

“…O gesso de Paris (anidrido sulfato de cálcio amorfo) ainda é um material disponível e rentável, tornando-se adaptável a uma variedade de circunstâncias, incluindo enfermarias hospitalares e unidades de cuidados intensivos. Vieira et al (2006) Uma outra opção de material comercial dentro deste grupo é a atadura gessada impregnada de resina de poliuretano, ou seja, o "gesso sintético". Este é mais caro que o anterior, mas sua resistência aumenta exponencialmente ao acréscimo de cada camada, enquanto que para o gesso convencional esta variação é linear (ROSSI et al, 1987).…”