A comparison of the clinical anesthetic efficacy of articaine infiltration and lidocaine blocking for microport extraction of impacted mandibular molar / 华西口腔医学杂志

<p><b>OBJECTIVE</b>To compare the clinical efficacy of the infiltration anesthesia with primacaine and the nerve blocking anesthesia with lidocaine for microport extraction of impacted lower third molar. METHODS; 104 chosen patients had both sides of impacted lower third molars extracted in this study. Patients were given local anesthesia with either primacaine or lidocaine randomly at each side, and then underwent microport extraction. Clinical factors including effective proportion (EP), effecting time point (ETP), visual analogue scale of pain (VASp), alteration of systolic pressures (ASP) and analgesia duration (AD) were evaluated statistically by means of paired t-test.</p><p><b>RESULTS</b>The EP of experimental group was higher than the control group (P = 0.024). The ETP of soft tissue and alveoli-dental pulp was (1.04 +/- 0.21), (2.44 +/- 2.60) min in the experimental group, and much earlier than that of the control group (P = 0.002, P = 0.032). The VASp and ASP of experimental group were lower than the control group (P = 0.041, P = 0.018). AD was (103.6 +/- 35.5) min, and higher than the control group (P = 0.04).</p><p><b>CONCLUSION</b>The infiltration anesthesia with primacaine has been proven to be a easier, reliable and quick-acting method. We suggest it an alternative method replacing the 2% lidocaine blocking during microport extraction of impacted lower third molar.</p>

DAPT enhances the apoptosis of human tongue carcinoma cells / 国际口腔科学杂志·英文版

<p><b>AIM</b>To investigate the effect of DAPT (gamma-secretase inhibitor) on the growth of human tongue carcinoma cells and to determine the molecular mechanism to enable the potential application of DAPT to the treatment of tongue carcinoma.</p><p><b>METHODOLOGY</b>Human tongue carcinoma Tca8113 cells were cultured with DAPT. Cell growth was determined using Indigotic Reduction method. The cell cycle and apoptosis were analyzed by flow cytometry. Real-time PCR and Immuno-Fluorescence (IF) were employed to determine the intracellular expression levels.</p><p><b>RESULTS</b>DAPT inhibited the growth of human tongue carcinoma Tca8113 cells by inducing G0-G1 cell cycle arrest and apoptosis. The mRNA levels of Hairy/Enhancer of Split-1 (Hes-1), a target of Notch activation, were reduced by DAPT in a dose-dependent manner. Coincident with this observation, DAPT induced a dose-dependent promotion of constitutive Caspase-3 in Tca8113 cells.</p><p><b>CONCLUSION</b>DAPT may have a therapeutic value for human tongue carcinoma. Moreover, the effects of DAPT in tumor inhibition may arise partly via the modulation of Notch-1 and Caspase-3.</p>

Analyses of differential expression of Homeobox genes between lingual squamaous cell carcinoma and normal mucosa / 华西口腔医学杂志

<p><b>OBJECTIVE</b>To investigate the differently expressed Homeobox genes between lingual squmaous cell carcinoma and normal mucosa.</p><p><b>METHODS</b>Seven paired specimens including lingual squmaous cell carcinoma and its surrounding normal tissue were obtained from 7 patients. Customized Oligo microarray which contains numerous probes of 232 human Homeobox genes was used to analyse the results. All datas were scanned by Agilent scanner and differentiately expressed genes were sorted out.</p><p><b>RESULTS</b>Homeobox gene NANOG was found up-regulated in 5 samples. PHTF2 was found down-regulated in 7 samples, and CRX, PITX1, OTEX was found down-regulated in 5 samples.</p><p><b>CONCLUSION</b>As the key gene to cellular proliferation and differentiation, Homeobox genes is closely releverant to the oncogenesis of lingual squmaous cell carcinoma.</p>

Sentinel lymphoscintigraphy in oral carcinoma: a clinical report of 10 cases / 华西口腔医学杂志

<p><b>UNLABELLED</b>OBJECTIVE; To determine the clinical value of preoperative in vivo location of sentinel lymph node (SLN) by lymphoscintigraphy (LS) in oral carcinoma.</p><p><b>METHODS</b>10 patients with oral carcinoma were included in this study (7 male to 3 female). 99mTc-dextron was injected peritumorally 24 h before surgery. Lymphoscintigraphy images were obtained in anterior and lateral views. SLNs were detected and removed with the aid of dye during surgery. A standard radical neck dissection was then performed, and all lymph nodes were analyzed by HE staining.</p><p><b>RESULTS</b>SLNs were successfully detected in 10 regions of 8 patients via lymphoscintigraphy. Consistent with the result of LS, 15 blue-stained SLNs were identified by means of dye method in 8 of 10 regions which the LS images indicated.</p><p><b>CONCLUSION</b>This study suggests that preoperative in vivo location of SLN via lymphoscintigraphy should be helpful for the application of SLNB in oral carcinoma.</p>

The study on the regeneration of skeletal muscles after denervation / 华西口腔医学杂志

<p><b>OBJECTIVE</b>To study the degeneration and regeneration of skeletal muscle after denervation.</p><p><b>METHODS</b>Denervation was carried out in gastrocnemius muscles in 30 adult BALB/C mice by cutting the sciatic nerve. The gastrocnemius muscles were removed at 1, 2, 4, 8, 12, 16 weeks after denervation, respectively. Specimens were processed for histological study and immunohistochemical technique.</p><p><b>RESULTS</b>Muscle fiber atrophy followed by degerneration and regeneration was observed in the early period of denervation. Fusion of the regenerated muscle cells with each other followed by degeneration of the cells and growth of fibro-connective tissue were observed in the later stage. The expression of myoglobin and actin decreased in 1-4 weeks after denervation. The postive expression of the proteins was observed in some 8 weeks' cells and in many degenerated 12-14 weeks' muscle cells.</p><p><b>CONCLUSION</b>Degeneration and regeneration may coexisted in the denervated muscles. The regenerated muscle cells can't fully develop due to the deficit of nerve regulation and degenerate again. The regenerated muscle cells will melt each other and can't develop to mature muscle fiber in the later stage.</p>