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Sealing capacity in vitro of thermoplasticized gutta-percha with a solid core endodontic filling technique (1998)

Valli, K. S. ; Rafeek, R. N. ; Walker, R. T.

Oxford, UK : Blackwell Publishing Ltd

Dental traumatology 14 (1998), S. 0

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ISSN: 1600-0595

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Medicine

Notes: Abstract— This study assessed the sealing capacity of two endodontic gutta-percha filling techniques. Thirty-four single-rooted fully developed teeth were endodontically accessed, instrumented and randomly divided into two experimental groups (n=12) and two control groups (n=5). In Group A, root canals were obturated using a solid core thermoplastic technique (Densfil), in Group B and Group C (negative control) canals were obturated with laterally condensed gutta-percha, and in Group D (positive control) canals were left un-obturated. AH-26 was used as the sealer. Two days later, the teeth were conventionally prepared for testing apical and coronal leakage, immersed in india ink for 5 days and subsequently cleared. The linear coronal and apical extent of dye penetration was measured under a light dissecting microscope. The mean apical leakage for Group A was 1.39 mm, and for Group B 2.76 mm, whereas the mean coronal leakage for Group A was 2.87 mm, and for Group B 4.03 mm. The differences between the groups were not statistically significant (P〉0.05).

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1600-9657.1998.tb00812.x

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Mineralization of 2,4,6-trinitrophenol (picric acid): Characterization and phylogenetic identification of microbial strains (1996)

Rajan, J ; Valli, K ; Perkins, R E ; [et al.]

Springer

Journal of industrial microbiology and biotechnology 16 (1996), S. 319-324

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ISSN: 1476-5535

Keywords: microbial degradation ; nitroaromatic degradation ; picric acid degradation ; 2,4,6-trinitrophenol mineralization

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology

Notes: Abstract Four bacterial strains that use picric acid as their sole carbon and energy source were isolated. Mineralization of14C-UL-picric acid showed that up to 65% of the radioactivity was released as14CO2. HPLC and UV/Vis spectral analyses indicated complete degradation of picric acid by these organisms. HPLC and LC/MS analyses showed transient formation of 2,4-dinitrophenol during picric acid degradation. Degradation of picric acid was concomitant with stoichiometric release of three moles of nitrite per mole of picric acid. The four picric acid degraders were identified as close relatives ofNocardioides simplex (ATCC 6946) based on their small subunit (16S) rRNA gene sequences.