Chemical and X-ray analyses of five brands of dental gutta-percha cone

Gurgel‐Filho, Eduardo Diogo; Feitosa, Judith P.A.; Teixeira, Fabrício B.; Paula, Regina C.M. de; Silva, J. B. Araújo; Souza-Filho, Francisco José de

doi:10.1046/j.1365-2591.2003.00653.x

Cited by 62 publications

(72 citation statements)

References 9 publications

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“…4(a) and (b) we can see that GP1 has two distinct transition temperatures where abrupt weight loss occurs at T=400ºC and T=600ºC. The first transition corresponds to the decomposition of PI, while the second corresponds to that of BaSO 4 8) from which we can deduce that this material is composed of 1:1:2 weight fractions of PI, BaSO 4, and ZnO in agreement with the SEM-EDAX images. In the case of GP2 we find a similar initial weight loss at 400°C corresponding to the PI matrix fraction and a decrease around 600°C of a component with a weight fraction of less than 10%.…”

Section: Compositionsupporting

confidence: 79%

“…It is composed primarily of trans-1, 4-polyisoprene, (Tg~−72°C), reinforced with inorganic metal oxide fillers whose composition is engineered to provide mechanical strength, anti-microbial protection, and radiopacity. The precise composition of commercially available Gutta-percha varies with manufacturer, but most compounds have very high filler content, typically 45-78% zinc oxide, 2-37% heavy metal salts, 1-8% waxes, and only 23% trans-1, 4-polyisoprene [3][4][5] . The mechanical requirements on these materials are very stringent.…”

Section: Introductionmentioning

confidence: 99%

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Effectiveness of X-ray computed microtomography to determine structure-property relationships of Gutta-percha

et al. 2017

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We have shown that Computed Microtomography (CMT) is able to map the internal distribution of the filler particles in ProTaper TM , Lexicon TM , and GuttaCore TM materials, and explain the differences in their tensile and ductility properties, prior to mechanical manipulation. Working of uncrosslinked ProTaper™ and Lexicon TM samples resulted in a five-fold increase in ductility and the tensile elongation at break. CMT mapping of the internal structure showed that large, periodic, striations formed across the interior of the sample corresponding to the formation of regions with low filler particle density. In contrast to metals which harden upon working, this migration of particles away from the high stress regions resulted in stress softening, as predicted by the Mullins effect.The results indicate that CMT is an effective method for 3-D visualization of the internal particle distribution which permits the determination of structure-property relationships and facilitates the design of new materials.

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Section: Compositionsupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Effectiveness of X-ray computed microtomography to determine structure-property relationships of Gutta-percha

et al. 2017

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“…Therefore, we sought to identify formulation parameters to alter the thermal properties of this polymer. In this study, TPI:100-S:0.5 was prepared as a standard material, with components and content ratios determined with reference to Ishii's report [31], to a study of SMP-2 [32] and to the components of commercial gutta-percha products for root canal filling material [23][24][25]. For TPI:100-S:0.5, the temperature at which the shape recovery ratio began to increase was 44 °C, and 100% shape recovery within 10 min was observed at over 52 °C (Figure 8).…”

Section: Discussionmentioning

confidence: 99%

Intraoral Temperature Triggered Shape-Memory Effect and Sealing Capability of A Transpolyisoprene-Based Polymer

et al. 2015

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Tel./Fax: +81-99-275-6192 : These authors contributed equally to this work. Abstract:In dentistry, pure gutta-percha (trans-1,4-polyisoprene (TPI)) is widely used as a main component of root canal filling materials. TPI has an interesting shape memory formed through cross-linking, and this characteristic is expected to be very effective for development of novel dental treatments; in particular, modification of the shape recovery temperature to the intraoral temperature (37˝C) will enhance the applicability of the shape-memory effect of TPI in root canal filling. In this study, trial test specimens consisting of varying proportions of TPI, cis-polyisoprene, zinc oxide, stearic acid, sulfur and dicumyl peroxide were prepared and the temperature dependence of their shape recovery, recovery stress and relaxation modulus were measured. Additionally, their sealing abilities were tested using glass tubing and a bovine incisor. As the ratio of cross-linking agent in the specimens increased, a decrease in recovery temperature and an increase in recovery stress and recovery speed were observed. In addition, the test specimen containing the highest concentration of cross-linking agent showed superior sealing ability under a thermal stimulus of 37˝C in both sealing ability tests.

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“…For example, three studies of the chemical composition of 20 brands of commercially available guttapercha cones showed great heterogeneity. The following percentages of chemical components were found: 15-22% gutta-percha (matrix), 37-84% zinc oxide (filler), 0-31% barium sulphate (radiopacifier), and 1-4% waxes and resins, or both (plasticizer) (13,15,20). The results obtained in our study suggest that the possible differences in the commercial formulations of the Brazilian (Dentsply®) and American (Hygenic®) gpc seem not to have influenced their decontamination with the aqueous or detergent solutions of 2% chlorhexidine digluconate.…”

Section: Discussionmentioning

confidence: 99%

Disinfection of gutta-percha cones with chlorhexidine

Redmerski¹,

Bulla²,

Moreno³

et al. 2007

Braz. J. Microbiol.

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This study investigated the effectiveness of detergent and aqueous solutions of 2% chlorhexidine digluconate in decontaminating gutta-percha cones (gpc) contaminated with bacteria, yeast, or bacterial spores. Guttapercha cones were contaminated with 10 7 -10 8 colony-forming units per milliliter (cfu/ml) of the following test organisms: Staphylococcus aureus, Enterococcus faecalis, Escherichia coli, or Candida albicans. Spores of Bacillus subtilis were also tested. Contaminated gpc were treated with the chlorhexidine solutions for 1, 5, 10, or 15 min. Each cone was then transferred to a tube containing saline and the micoorganisms were recovered after homogenization for cfu determination. Both detergent and aqueous chlorhexidine solutions were effective in eliminating S. aureus, E. faecalis, and C. albicans cells adhered on the surface of gpc within 1 min of exposure. E. coli was eliminated in 5 min with detergent solution. The Bacillus subtilis spores were eliminated by chlorhexidine solutions within 5 min. The results of this study demonstrated that both aqueous and detergent solutions of 2% chlorhexidine digluconate were effective in decontaminating gpc within 5 minutes of exposure.

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Chemical and X-ray analyses of five brands of dental gutta-percha cone

Cited by 62 publications

References 9 publications

Effectiveness of X-ray computed microtomography to determine structure-property relationships of Gutta-percha

Effectiveness of X-ray computed microtomography to determine structure-property relationships of Gutta-percha

Intraoral Temperature Triggered Shape-Memory Effect and Sealing Capability of A Transpolyisoprene-Based Polymer

Disinfection of gutta-percha cones with chlorhexidine

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