Efeito da armazenagem sobre a estabilidade dimensional e reprodução de detalhes de dois diferentes hidrocolóides irreversíveis: um convencional e outro de alta estabilidade dimensional

• Autor(a) principal: Carneiro, Paola Cristina [UNESP]
• Data de Publicação: 2015
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/149707; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2017-01-31/000868082.pdf
• topic: Alginatos; Modelos dentários; Precisão da medição dimensional; Alginates

Alginate is between the most impression materials used in dentistry, mainly by uniting technical properties to a satisfactory considered low cost.However, it is a very sensitive material, requiring accuracy with regard to its properties. New products are released in an attempt to compensate for some of their disadvantages, such as for example, dimensional instability. This study aimed to evaluate the influence of storage in the course of five days, on the dimensional changes and maintenance details of a high stability alginate, Hydrogum 5, comparing it with the conventional Hydrogum of same brand (Zhermack). For the preparation of the test specimens was used an array, according to the specifications no. 18,19 and 25 ANSI / ADA being acquired 20 molds, 10 for each alginate.For the dimensional stability test were taken photos with digital camera (Nikon D50). Each mold was photographed immediately after its removal from the matrix, and each storage period (15 minutes, 24, 48, 72, 96 and 120 hours), kept hermetically sealed in plastic bags. Measurements were performed in Corel Draw X6 program. In addition, 70 samples of each alginate were prepared and used for the details of the maintenance test by obtaining gypsum-stone type IV designs, verifying reproduction and sharpness three grooves for each storage period (n = 10). After analyzing the results Hydrogum 5 and conventional Hydrogum, it was observed that they showed no significant difference from the metal matrix dimensions (p> 0.05) in the immediate period and after 15 minutes of storage. Both alginates submitted a negative linear dimensional change value of prey (contraction) statistically significant after 24 hour storage (1.52% to 5 Hydrogum; 1.32% conventional Hydrogum). Alginates have not kept playing all the details over time, but both reproduced groove 75 micrometers. Half...