The preliminary study of the use of MRI navigation in identifying the safe surgical margin of the maxillofacial malignancy / 中华口腔医学杂志

<p><b>OBJECTIVE</b>To evaluate the feasibility of MRI navigation in identifing the safe surgical margin of the maxillofacial malignancy.</p><p><b>METHODS</b>The pathology results of the surgical margin identified by the technique of MRI navigation form 20 patients with maxillofacial malignancy were compared with those of 45 patients with maxillofacial malignancy who underwent the routine operation without MRI navigation.</p><p><b>RESULTS</b>There was no difference between the two groups of patients in age, sex, size of tumor, tumor stages, pathologic diagnosis (P > 0.05). The negative rate of the surgical margin of the lesions treated by surgery with the technique of MRI navigation was significantly lower than that of the lesions treated without MRI navigation (P = 0.007) and highly correspondent with the pathology results.</p><p><b>CONCLUSIONS</b>MRI navigation was helpful in identifying the safe surgical margin of the maxillofacial malignancy.</p>

Experimental study on co-culture of salivary adenoid cystic carcinoma cells and ganglia / 中华口腔医学杂志

<p><b>OBJECTIVE</b>To construct the co-culture models of salivarya denoid cystic carcinoma (SACC) cells and dorsal root ganglia (DRG) of chickens and investigate the promotive effects of SACC on neural tissue.</p><p><b>METHODS</b>Glass-base culture dish was adopted to construct co-culture model of SACC-83 cells and DRG. SACC-83 cells were seeded in the medium pore with DRG around them. Outgrowth of neuronal processes was observed. Then DRG was cultured in the conditioned medium of SACC-83, with the groups of conditioned medium of MC3T3-E1 and HGF, the group of cell lysis buffer, the groups of serum-free medium and serum-plus medium as the controls. Outgrowth of neuronal processes was also recorded and compared with control groups.</p><p><b>RESULTS</b>In the co-culture model of tumor and neuronal tissue, SACC-83 cells produced a suitable microenvironment in which neuronal processes remarkably grow. Neuronal processes of most DRG displayed growth tendency toward SACC. The group of conditioned medium from SACC-83 manifested obvious promotive effects on DRG.</p><p><b>CONCLUSIONS</b>Co-culture model of tumor and neuronal tissue was successfully constructed, with which the promotive effects of tumor on outgrowth of neuronal processes could be observed. So hypothesized that SACC could secrete some neurotrophic factors to guide peripheral nerves gemmating and to trigger the cascade of the neural invasion in succession.</p>

Shielding property of different prosthetic materials to shield radiation of (125)I seed / 中华口腔医学杂志

<p><b>OBJECTIVE</b>To investigation the shielding property to (125)I of several different prosthetic materials used in clinical when prostheses are used as carriers of (125)I seed in tumor treatment.</p><p><b>METHODS</b>(125)I seeds were taken as the radiation sources to establish a model in vitro and the radiation doses were measured by thermoluminescent dosemeters (TLD). The shielding property of titanium plate, cochrome plate, and poly methyl methacrylate (PMMA) plate were detected, calculated and compared with that of plumbum plate in the control group.</p><p><b>RESULTS</b>The radiation doses of the radiation source at 10 mm distance through the following materials were measured, and the results are 2.805 mGy (0.09 mm thick titanium plate), 1.082 mGy (0.48 thick titanium plate), 0.390 mGy (0.41 mm thick cochrome plate), and 0.261 mGy (0.67 mm's cochrome plate), and 2.885 mGy (1.685 mm thick PMMA plate).</p><p><b>CONCLUSIONS</b>The shield property of cochrome is optimal. The poly methyl methacrylate behaves to some extend as a shield to the (125)I seed which can shield the radiation as the effects of plumbum when adopted together with the 0.557 mm's (or more) titanium plate.</p>

Changes in cerebral blood flow during mastication in patients receiving prosthesis insertion for repairing maxillary defect / 南方医科大学学报

<p><b>OBJECTIVE</b>To investigate the changes in cerebral blood flow in patients with maxillary defect treated with prosthesis insertion.</p><p><b>METHODS</b>Thirty patients with maxillary defect receiving obturator prosthesis insertion were enrolled with another 30 subjects without dentition defect as the control. The cerebral blood flow rate was recorded before and at 5 and 10 min during mastication, and the results were analyzed statistically.</p><p><b>RESULTS</b>There was no significant difference in Vs, Vd or Vm between the two groups at the time points for measurement.</p><p><b>CONCLUSION</b>The blood supply by the middle cerebral artery is similar between the patients receiving obturator prosthesis insertion for maxillary defect and the subjects with full denture.</p>

Investigation and management of wound on head and neck from the disaster area in Wenchuan earthquake / 中华耳鼻咽喉头颈外科杂志

<p><b>OBJECTIVE</b>To investigate and analyze the wounded's state of ear, nose, throat, neck and head injury in Wenchuan earthquake.</p><p><b>METHODS</b>The 206 wounded cases, who was treated in No. 452 Hospital of People's Liberation Army, were investigated specially with emphasis on injury cause, severity and treatment.</p><p><b>RESULTS</b>The injured 165 cases among the 206 were in hospital, while the cases who related to the injury of ear, nose and throat were 37 cases (22.4%). Among the inpatients, the trauma of otorhinolaryngology and head and neck included: ear injuries totally 13 cases (including hemotympanum 2 cases), extraneous matter 4 cases, haemorrhagic 4 cases, nasalis and the fracture of nasal bone and nasal sinuses 7 cases (including cerebrospinal rhinorrhea 1 case), zygomatic abscess 1 case, fracture of mandible 4 cases, lip injuries 2 cases and hoarse 2 cases. The inpatients were wounded mostly because of falling and stepping. All the inpatients recovered well after properly management by ENT doctors.</p><p><b>CONCLUSIONS</b>Maxillofacial injury of the wounded those were medical evacuation in the earthquake area, was ignored more readily comparing to the injury of other spots, so specialist should examine early and treat properly the people as soon as possible.</p>

Establishment of the database of female skull by the aesthetics / 中华整形外科杂志

<p><b>OBJECTIVE</b>The three-dimensional (3D) craniofacial measurements were studied through the quantitative computed tomography (CT). The dynamic database of quantitative measurement of three-dimensional craniofacial bone was established as mandible in physiological position.</p><p><b>METHODS</b>170 aesthetics female were examined by spiral volumetric CT (GE SR-7000). 3D craniofacial bone images were reformatted and 3D measurements were performed in SUN Workstation respectively. 33 points were defined in the 3-d craniofacial structure in screen, 14 distances and 11 angles were measured, and 12 ratios were calculated in each case. All data were transferred into the database based on the SPSS software. There is all information of one case (such as number, sex, age, distances, angers) in one row; each column is a measurement item. The mean, standard deviation, standard error, medium, coefficient of variation and 95% confidence interval of data can be calculated and the correlation, regression between several groups of measurement item can be proceeded by computer automatically in the dynamic database.</p><p><b>RESULTS</b>3D craniofacial bone imagings were displayed in arbitrary views without disturbing superposition by using cutting, rotating and 3D measurement procedures. The large data volume provides more information of special relationship of skull base, zygomatic bone, maxilla, mandible and vertebra. The coefficient of variation of skull base is less than them of maxilla and mandible. The standard deviation of ratios is further smaller than the standard deviation of distances and angles. With stepwise regression, the equation is (Go - Go) Y = 0.578X1 + 0.754X2 + 0.228X3 - 0.579X4 - 14.672; (Tz- Tz) : Y = 0.775X1 + 0.161X2 + 0.348X3 + 0.201X4 + 27.730.</p><p><b>CONCLUSIONS</b>The database offers reference of the studying of growth rule of craniofacial bone of aesthetics female. It will help improve diagnostic accuracy, staging of reconstruction, precision of corrective surgery, and follow-up patients.</p>

Reconstruction of caprine mandibular segmental defect by tissue engineered bone reinforced by titanium reticulum / 中华创伤杂志(英文版)

<p><b>OBJECTIVE</b>To investigate the feasibility of using natural poritos as scaffolds in bone tissue engineering (TE) and repair of caprine mandibular segmental defect with titanium reticulum reinforced.</p><p><b>METHODS</b>Natural poritos with a pore of 190-230 microm in size and porosity of about 50percent-65percent was molded into the shape of granules 5 mm x 5 mm x 5 mm in size. Expanded autologous caprine marrow mesenchymal stem cells were induced by recombinant human morphogenetic protein-2 (rhBMP2) to improve osteoblastic phenotype. Then marrow derived osteoblasts were seeded into poritos in density of 4 x 10(7)/ml and incubated in vitro for 48 hours prior to implantation. Then osteoblastic cells/poritos complexes were implanted into mandibular defect and the defect was reinforced by titanium reticulum. Implantation of poritos alone acted as the control. Bone regeneration was assessed 4, 8, 16 weeks after implantation using roentgenographic analysis and histological observation was done after 16 weeks.</p><p><b>RESULTS</b>New bone could be observed histologically on the surface and in the pores of natural coral in all specimens in the cell-seeding group, whereas in the control group there was no evidence of osteogenesis process in the center of the construction. The results showed that new bone grafts were successfully restored 16 weeks after implantation.</p><p><b>CONCLUSIONS</b>This study suggests the feasibility of using porous coral as scaffold material transplanted with marrow derived osteoblasts by TE method. By means of titanium reticulum reinforcement, mandibular defect could be successfully restored. It shows the potentiality of using this method for the reconstruction of bone defect in clinic.</p>