FTIR spectroscopic explorations of freshly resected laryngeal carcinoma tissues / 中华肿瘤杂志

<p><b>OBJECTIVE</b>To investigate the characteristics of freshly resected laryngeal carcinoma by Fourier transform infrared spectroscopy (FTIR).</p><p><b>METHODS</b>FTIR was applied to the study of the cancerous tissues and adjacent normal tissues in 32 patients.</p><p><b>RESULTS</b>Compared with pathological diagnosis results, one benign specimen was classified as a malignant, the accuracy was 98.4%. Significant differences were seen in the FTIR spectra between the normal and malignant laryngeal tissues. The peak at 1085 cm(-1) shift to 1114 cm(-1) showed that the relative contents of DNA in laryngeal carcinoma cells was increased. The peak at 1397 cm(-1) was stronger than 1451 cm(-1) in normal tissues, while it was not obvious in cancer tissues. I(2926)/I(2870) in carcinoma cells was lower than that in normal tissues. The wave numbers of the bands of amide I and amide II, symmetric and asymmetric stretching bands of CH(3), stretching vibration bands of C-OH and NH band were shifted to higher number in cancer tissues.</p><p><b>CONCLUSION</b>The study shows that the malignant and normal laryngeal tissues have different FTIR spectra, which are mainly due to changes in protein, nucleic acid and phospholipids. FTIR may become a new method for the diagnosis of laryngeal carcinoma in clinical practice.</p>

Animal experimental study of the treatment of periapical disease with recombinant human bone morphogenetic protein-2 composite / 华西口腔医学杂志

<p><b>OBJECTIVE</b>To investigate the effect of the treatment of periapical diseases with recombinant human netic protein (rhBMP-2) composite in dog models so as to provide basis for its clinical application.</p><p><b>METHODS</b>The endotoxin-bacteria mixed fluid was injected into each root canal of the experimental teeth of dogs and the animal periapical were built. The rhBMP-2 composite was mixed by rhBMP-2, TCP, collagen and metronidazole and used in the treatment cal diseases in dog models as root apex screen. The imageology and pathology research were went on.</p><p><b>RESULTS</b>The effective rate of the experimental group was remarkably higher than that of the carrier group and the control group with remarkable ference (P < 0.05). The quality of the repair of tissue was obviously better than the two other groups.</p><p><b>CONCLUSION</b>The rhBMP-2 composite is a promising biological root-canal filling material.</p>