ABSTRACT: 3200

Influence of Disinfectant Liquids in Diametral Tensile Strength of Gypsum

E.C. LIMA, Universidade Federal Da Bahia, Salvador, Brazil, C.C. ESPINHEIRA, UNIVERSIDADE FEDERAL DA BAHIA, Salvador, Brazil, M.J.M.C. SANTOS, Universidade Federal Da Bahia, London, Canada, G.P. FREITAS, Universidade Federal da Bahia, Salvador - Ba, Brazil, M.D. SAMPAIO, Universidade Federal da Bahia, Salvador, Brazil, G.C. SANTOS JÚNIOR, University Western Ontario, London, On, Canada, and A.P. FREITAS, UNIVERSIDADE FEDERAL DA BAHIA, London, Canada
Objective: This study evaluated the Diametral Tensile Strength (DTS) of dental gypsum product (Type IV) mixed with distilled water and different disinfection liquids. Methods: Disk specimens (n 30) were made, according to ISO standard and divided into three groups. Group 1 (control) was reacted with distilled water, Group 2 was mixed with 2% glutaraldehyde and the Group 3 was mixed with 0.5% sodium hypochlorite. All specimens were tested using a universal test machine (EMIC) at a crosshead speed of 1 mm/min. Results: The DTS values (in kgf/cm2) of the groups were: G 1 * 42.11 (4.74); G 2 * 37.7 (3.11); G 3 * 42.9 (6.07). Tukey's test (p=0.05) showed that, the use of the mean DTS value for Group 2 was significantly lower than control. However, Group 3 was not significantly different. Conclusion: It can be concluded that 0.5% sodium hypochlorite can be mixed with dental gypsum product (Type IV) without change of DTS value.
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