Brazilian gutta-percha points: Part I: chemical composition and X-ray diffraction analysis

Abstract

Eight nonstandardized gutta-percha points commercially available in Brazil (Konne, Tanari, Endopoint, Odous, Dentsply 0.04, Dentsply 0.06, Dentsply TP and Dentsply FM) were analysed chemically and by X-ray diffraction, and their chemical compositions were compared. The organic fraction (gutta-percha polymer and wax/resin) of the gutta-percha points was separated from the inorganic fraction (ZnO and BaSO4) by dissolving them in chloroform. The gutta-percha polymer was precipitated with acetone. The inorganic fraction was analysed by elemental microanalysis. Energy-dispersive X-ray microanalysis (EDX) and X-ray diffraction were employed to identify the chemical elements and compounds (barium sulfate and zinc oxide). The barium sulfate content was calculated based on the percentage of sulfur found in the elemental microanalysis. All analyses were repeated three times. The means and standard deviations of the percentage by weight of gutta-percha in the points were: Konne (17.6 +/- 0.30), Tanari (15.2 +/- 0.30), Endopoint (16.7 +/- 0.23), Odous (18.8 +/- 0.20), Dentsply 0.04 (15.7 +/- 0.17), Dentsply 0.06 (16.6 +/- 0.17), Dentsply TP (21.6 +/- 0.15) and Dentsply FM (16.3 +/- 0.23). The means and standard deviations of the zinc oxide content were: Konne (79.9 +/- 0.10), Tanari (81.9 +/- 0.07), Endopoint (81.3 +/- 0.40), Odous (79.7 +/- 0.26), Dentsply 0.04 (77.9 +/- 0.03), Dentsply 0.06 (78.2 +/- 0.07), Dentsply TP (69.8 +/- 0.19) and Dentsply FM (72.6 +/- 0.70). The method utilized was appropriate to quantify gutta-percha, wax/resin, zinc oxide and barium sulfate. Cone brands without barium sulfate were found. An unusual high wax/resin percentage was detected in Dentsply FM (p = 0.0003). Dentsply TP showed the highest gutta-percha percentage.

In vitro analysis of thermocompaction time and gutta-percha type on quality of main canal and lateral canals filling

“…Literature shows that a greater amount of gutta-percha has been found in TP cones, when compared to eight other commercial brands. 13 The use of resin for the simulated root canals allowed a standardization of the experiment, eliminating variables among natural teeth. The simulated root canals had lateral canals in the middle and apical thirds, in the bucco-lingual aspect, for evaluation of the filling material penetration.…”

A quitosana como biomaterial odontológico: estado da arte

“…A gutta-percha é o trans-1,4-poliisopreno obtido pela coagulação do látex produzido pelas árvores da família Sapotaceae. A gutta é rígida à temperatura ambiente, tornando-se maleável a 25-30 º C, amolece a 60 º C e derrete a 100 º C com decomposição parcial (Maniglia-Ferreira et al, 2005). Na realidade, a gutta-percha é apenas um dos constituintes dos cones dentários.…”

Um material alternativo à base de SBS para substituir a guta percha no tratamento endodôntico

“…Até hoje, a guta percha é a substância obturadora mais utilizada na recuperação do sistema de canais radiculares [3][4][5][6][7][8][9] . Trata-se de um polímero natural, obtido pela coagulação do látex de algumas poucas espécies de árvores da família das Sapotáceas, do gênero Palaquium, das espécies Mimusops balata e Mimusops huberi, existentes principalmente na Sumatra, Filipinas e Malásia [10][11][12][13][14][15] . O principal componente presente no látex é o polímero poli-trans-isopreno, entretanto, o isômero cis pode estar presente em menor proporção [3][4][5][6][7]9,10,[12][13][14][15][16] .…”

“…Trata-se de um polímero natural, obtido pela coagulação do látex de algumas poucas espécies de árvores da família das Sapotáceas, do gênero Palaquium, das espécies Mimusops balata e Mimusops huberi, existentes principalmente na Sumatra, Filipinas e Malásia [10][11][12][13][14][15] . O principal componente presente no látex é o polímero poli-trans-isopreno, entretanto, o isômero cis pode estar presente em menor proporção [3][4][5][6][7]9,10,[12][13][14][15][16] . Em seu estado natural, a guta percha possui massa molar variando entre 10 4 a 10 6 g.mol -1 [8,11,17,28] .…”