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Clinical and radiographical study of antro-oral fistula (1995)

Kishi, Kanji ; Nakatsu, Tsugio ; Wakasa, Toru ; [et al.]

Springer

Oral radiology 11 (1995), S. 17-22

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ISSN: 1613-9674

Keywords: Antro-oral fistula ; Maxillary sinusitis ; Radiography

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Abstract Fifty-two patients who developed antro-oral fistula following tooth extraction were examined clinically and radiographically. Of these, 39 patients had only perforation of the antral floor and the other 13 had the tooth root pushed into the maxillary sinus. Maxillary sinusitis was present in 43 cases. The most frequent site of antro-oral fistula was the upper first molar, and the palatal root of the upper first molar was pushed into the antrum the most frequently. Our study suggested that most of the patients with antro-oral fistula had associated maxillary sinusitis before the extraction of the tooth. The highest risk of the occurrence of antro-oral fistula appeared to be at the time of extraction of the upper first molar associated with periapical and periodontal lesions.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02347905

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Poly(β-Amino acids). V. Synthesis and conformation of oligomeric α-isobutyl-L-aspartate (1979)

Yuki, Heimei ; Okamoto, Yoshio ; Doi, Yuichi

New York : Wiley-Blackwell

Journal of Polymer Science: Polymer Chemistry Edition 17 (1979), S. 1911-1921

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ISSN: 0360-6376

Keywords: Physics ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: α-Isobutyl-L-aspartate oligomers, Z-(α-i-Bu-Asp)2n-OEt (n = 1-5), where Z = benzyloxycarbonyl and OEt = ethyl ester, were prepared stepwise, and their conformation in solution was investigated by optical rotation, circular dichroism (CD), and NMR spectroscopy. The oligomers up to hexamer existed only in a disordered form. An ordered structure began to appear at octamer and decamer in chloroform and 2,2,2-trifluoroethanol. The ordered structure was more favorable for N-unprotected oligomers, H-(α-i-Bu-Asp)2n-OEt, in comparison with the corresponding Z-(α-i-Bu-Asp)2n-OEt. The effects of oligomer concentration and temperature on the structure were slightly observed. The most likely ordered structure was a β form caused by intramolecular association.

Additional Material: 7 Ill.