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  • Keyword Y Chromosome  (1)
  • Root canal length  (1)
  • Springer  (2)
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  • Springer  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Root canal length measurement in teeth with electrolyte compensation (1992)
    Springer
    Medical & biological engineering & computing 40 (1992), S. 200-204 
    Details
    ISSN: 1741-0444
    Keywords: Tooth ; Root canal length ; Voltage difference ; Endodontic therapy ; Impedance ratio ; Clinical evaluation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract Electronic root canal length measurement devices have made it easier and faster to measure the root canal length of a tooth compared with the conventional radiographic method. Of these electronic apex locators, the frequency-dependent type features greater accuracy and convenience in operation. However, its accuracy is still influenced by the presence of blood and/or the various electrolytes used in root canal therapy. This study describes the development of a new frequency-dependent electronic apex locator featuring electrolyte compensation, utilising an impedance ratio and voltage difference technique to minimise the influence of electrolytes on the accuracy of root canal length measurement. The errors for distances from file tips to apical constrictions were determined in vivo with the device operating with electrolyte compensation. The measured lengths were compared with the true lengths of the extracted teeth determined using a microscope. The mean error was +0.14±0.27 mm, and 95.2% of the measurements were within the clinical tolerance of ±0.5 mm. It was also found that the degree of accuracy was not dependent on the size of the apical foramen (p=0.74).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02348125
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  • 2
    Electronic Resource
    Electronic Resource
    Y-Specific DNA polymorphisms of the YAP element and the locus DYS19 in the Korean population (1998)
    Springer
    Journal of human genetics 43 (1998), S. 195-198 
    Details
    ISSN: 1435-232X
    Keywords: Keyword Y Chromosome ; DYS287 ; DYS19 ; Chinese ; Japanese ; Korean
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The Y Alu polymorphic (YAP) element (DYS287) and the Y-linked tetranucleotide microsatellite locus DYS19 were examined in samples from a total of 455 unrelated males in the Korean population. The frequency of the YAP + allele was found to be 1.3% (6/455) in the Korean population. These results are consistent with previous reports that showed the YAP element to be absent in most Asian populations, with the exception of the high frequency of the YAP + allele in the Japanese population. All five common alleles at the DYS19 locus were identified in this study. The C allele was the most frequent (197/455), followed by the D (119/455), B (78/455), E (41/455), and A (20/455) alleles. Seven combination haplotypes (DYS287/DYS19) were found, and the mean combination haplotype diversity in the Korean population appeared to be 0.71. Based on results of these two loci, Japanese and Korean populations may share some common genetic structure that could reflect recent gene flow and some amount of admixture of Y chromosomes between these two populations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100380050069
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