Extração da lignina do bagaço de cana-de-açúcar e seu emprego na melhoria da resistência a compressão do cimento odontológico

Abstract

In Brazil, the sugar cane is strongly present in agricultural activity in the country, mainly used for the manufacture of sugar and alcohol. With this, the quantity of bagasse generated is high and large part there destination, getting piled up in the courtyard of the plants. The bagasse from sugar cane is rich in lignocellulosic materials, cellulose, hemicellulose and lignin. The lignin is responsible for providing the plant resistance, therefore the use of lignin has been employed in several areas, polymers, carbon fibers, among others. Leveraging the characteristics that the lignin features of resistance, it used the same to ascertain their contribution in increasing resistance to compression of the dental Cement, cement used was the MTA Angeus, manufactured by Angelus Dental Products Industry S/A. It was proposed three different methodologies of extraction of the lignin from sugarcane bagasse, after the extraction was characterized by vibrational spectroscopy of absorption in the infrared region, which led to conclude that the lignin removed is of type G-S. The lignin was added to the cement of 1 to 7%, with the aim of verifying the increase of resistance to compression of the cement. The setting time of the material did not change with the addition of lignin, presenting on average 13 minutes of prey. The cement with lignin showed resistance to compression between 23 and 26 MPa after 24 hours, equal values found for the MTA Angelus and larger than the MTA Repair HP.