BACKGROUND:Conventional methods,including trypsin digestion and cells transfer using single call suspension,have many drawbacks,which limit the development of bone tissue engineering.OBJECTIVE:To culture bone marrow stromal stem calls,induce osteoblastic differentiation,and prepare cell sheets.METHODS:Canine bone marrow stromal calls were isolated by density gradient centrifugation technique,inoculated into DMEM medium,and induced to differentiate into osteoblasts.Complete call sheets were harvested by call sheet engineering based on the temperature change of temperature-responsive medium.RESULTS AND CONCLUSION:Immediately after inoculation,primary calls were scattered on the bottom of culture flask,presenting a transparent spherical body with a good refractive capacity.At 12 hours,calls exhibited a long shuttle shape,reached complete confluency,and grew in a whirlpool-like fashion.After osteoblastic induction,the majority of bone marrow stromal stem calls appeared tetragonal,polygonal,and squamose.At 21-28 days,round or oval-shaped calcified nodules formed.When the bone marrow stromal stem calls in the temperature-responsive culture dishes were cooled below the critical temperature 32℃,cells were gradually detached from the bottom of culture flask and formed complete bone marrow stromal stem call sheets.These findings indicate that density gradient cantrifugation technique can be used to successfully isolate and culture canine bone marrow stromal stem cells to differentiate into osteoblasts and call sheet engineering enables to harvest complete bone marrow stromal stem call sheets.

BACKGROUND:n mandibular posterior dental implantation,injury to the inferior alveolar nerve sometimes occurs because of mandibular canal going across mandibular body.This restricts the use of dental implantation at this site.Therefore,it is essential to understand the anatomic structure of inferior alveolar nerve canal in mandibular posterior dental implantation.OBJECTIVE:To observe the intramandibular course of and anatomic structure of inferior alveolar nerve canal.METHODS:Fifteen adult complete mandible specimens with teeth and 4 fresh mandible arterial infusion specimens were researched.All the specimens had complete dentition and there were no obvious absorption in alveolar bone.The course of inferior alveolar nerve canal and its dimension including transverse and longitudinal diameters of mandibular canal and the distance between mandibular canal and mandible each side (superior,inferior,buccal and lingual side) were measured in 15 adult mandibles with teeth.The relationship between blood vessels and nerve of the canal was observed in 4 fresh arterial infusion specimens.RESULTS AND CONCLUSION:The distance between the medial border of the mandibular canal and the lingual wall was shorter than that of the lateral wall of the mandibular canal to the buccal wall (P < 0.01);The length from the upper wall of mandibiular canal to the top of the alveolar ridge was longer than that of the inferior border of the mandibular canal to the inferior border of the mandible (P < 0.01).The longitudinal diameter was smaller than the transverse diameter (P < 0.05),namely,the cross section of the mandibular canal was an ellipse with a longer longitudinal diameter.There was no significant difference between the transverse and longitudinal diameters of the canal in the anterior and posterior teeth region of the mandible.The inferior alveolar nerve and its associated blood vessels were located within a nervous vascular bunch in the mandibular canals.In every fresh specimen the blood vessels lay above the nerve.There were small branches of blood vessels surrounding thenerve.The mandibular canal ran towards the lingual side and was close to the inferior margin of the mandible.

BACKGROUND:Recently,acellular dermal matrix allograft has been widely used in the repair of oral mucosal defects.But little information is about the heterogeneous acellular dermal matrix (HADM) patch for repair of oral mucosal defects.OBJECTIVE:To investigate the efficacy and biosafety of HADM in the repair of oral mucosal defects.METHODS:In total 71 patients with oral benign or malignant tumors who had oral mucosal or soft tissue defects following tumorectomy were included in this study.These patients comprised 37 males and 34 females,and were averaged 45 years (range,20-70 years old).Of them,42 suffered from benign tumors and 29 from malignant tumors.HADM patches were used for repair of oral mucosal defects.The survival,color,and texture of HADM patches were observed.Shrinkage rate of HADM patches was compared between regions without supports from hard tissues (cheeks,tongue,and mouth floor) and with supports from hard tissues (gingiva,hard palate).RESULTS AND CONCLUSION:All 71 HADM completely survived.No necrosis and infection occurred.At 2 weeks after transplantation,(98.20±5.20) % of patch area survived.At 3 months after transplantation,patches showed similar color to surrounding oral mucosa and most patients had sense of tension to different extents.At 6 months after transplantation,cell creeping substitution and vasculadzation were successfully accomplished in the region of patch transplantation.Patches grew stably,with smooth pink appearance and good elasticity,and no further shdnkage.Patients felt normal.HADM patch shrank primarily at 2 weeks-1 month after transplantation,and tended to be stable at 3 months.There was no significant difference in tissue morphology between surgical region and normal tissue.The HADM shdnkage rate was significantly higher in regions without supports from hard tissues than regions with supports from hard tissues.These findings indicate that HADM patches have advantages in repair of oral mucosal defects including good histocompatibility,wide source,simple manipulation,and able to cover the wound surface in the early state,promote wound surface healing,and reduce scar formation,and can be used as an ideal matedal for repair of oral mucosal defects.

Objective To determine association between tongue carcinoma and polymorphism of urokinase-type plasminogen activator (PLAU) gene.Methods PLAU genotypes of 97 patients with tongue carcinoma and 91 health controls were examined by the PCR-RFLP method.Statistical analyses included a chi-square test for homogeneity and logistic regression analysis.Results The polymorphism in PLAU gene was rs2227564 C/T.Logistic analyses indicated that compared with CT and TT genotypes,CC genotype was risk factor for development of tongue carcinoma (adjusted OR =1.281,95 ％ CI 1.098-2.577,P =0.037).Conclusion PLAU polymorphism may be associated with development of tongue carcinoma.

OBJECTIVETo analyze the formant frequency of vowels in the sequence therapy of patient with cleft palate.

METHODSThe formant frequency of vowels [a], [e], [i], [u] of normal children and postoperative patients with and without speech therapy was measured and analyzed by VS-99.

RESULTS1. The mean value of F1, F2, F3 of [a] did not show significant difference among the three groups (P > 0.05). 2. The difference of mean value of [e] was significant between control group and pre-speech-therapy group, and between pre-speech-therapy and post-speech-therapy group (P < 0.05), but no significant difference was found between post-speech-therapy and control group(P > 0.05). The mean value of the formant in post-speech-therapy was higher than that of pre-speech-therapy. 3. The difference of mean value of [i] was significant between pre-speech-therapy and post-speech-therapy (P < 0.05), the mean value of F2, F3 in post-speech-therapy group decreased significantly compared with control (P < 0.05). 4. The difference of mean value of [u] showed significance between pre-speech-therapy and post-speech-therapy (P < 0.05), while the differences among other groups were insignificant (P > 0.05).

CONCLUSIONSurgical repair of cleft palate cannot make all patients obtain perfect Velopharyngeal competence (VPC), while speech therapy can improve patient's pronunciation. Speech spectrum analysis can judge the effect of cleft palate therapy objectively.

Adolescent ; Adult ; Articulation Disorders ; etiology ; physiopathology ; Child ; Cleft Palate ; complications ; physiopathology ; surgery ; Female ; Humans ; Male ; Postoperative Period ; Sound Spectrography ; Speech ; physiology ; Speech Articulation Tests ; Speech Production Measurement ; Speech Therapy ; Velopharyngeal Insufficiency ; etiology ; physiopathology

OBJECTIVETo construct functional tissue-engineered bone with cell sheet technology and method of traditional bone tissue engineering.

METHODSCanine bone marrow mesenchymal stem cells (BMSCs) were isolated with the method of density gradient centrifugation and cultured. BMSCs were induced to differentiate into osteoblasts and cultured in temperature-responsive culture dishes at 37 degrees C, 5% CO2 and saturated humidity. BMSCs cell sheet was prepared when temperature was changed to 20 degrees C. Demineralized bone matrix (DBM) and platelet-rich plasma (PRP) were prepared, and complex of DBM/PRP/BMSCs cell sheet/BMSCs was construsted and implanted under the left latissimus dorsi muscle. Complex of DBM/PRP/BMSCs was implanted under the right latissimus dorsi muscle.

RESULTSWhen temperature dropped at 20 degrees C, BMSCs detached automatically from the temperature-responsive culture dishes and formed an intact cell sheet. The osteogenesis of the DBM/PRP/BMSCs cell sheet/BMSCs group was better than that of the DBM/PRP/ BMSCs group.

CONCLUSIONCell sheet technology combined with traditional bone tissue provides a new way for construction of ideal functional tissue-engineered bone.

Animal Experimentation ; Animals ; Bone Marrow Cells ; Bone and Bones ; Cells, Cultured ; Mesenchymal Stromal Cells ; Osteoblasts ; Osteogenesis ; Platelet-Rich Plasma ; Stromal Cells ; Tissue Engineering

OBJECTIVETo reconstruct mandibular defect using tissue engineering bone with bone marrow stem cells (BMSCs) cell sheets and investigate the effect of cell sheets on osteogenesis.

METHODSBMSCs were isolated with the method of density gradient centrifugation from canine and cultured. BMSCs were induced to differentiate to osteoblasts. BMSCs induced were fabricated to BMSCs cell sheets. The poly (lactic-co-glycolic acid) (PLGA) wrapped with cell sheets were implanted into the mandibular defect in the left side (experimental side). PLGA wrapped without cell sheets were implanted into the right side (control side) of mandibles. 16 dogs were evenly divided into 4 groups, and one group of them was executed in 4, 8, 12, 16 weeks for gross investigation and histological observation.

RESULTSThe osteogenesis of experimental side was better than that of control side. 16 weeks after implantation, most areas of the mandibular defect were replaced by fresh bone tissue. Compact bone similar to normal bone tissue formed in the lingual defect of mandible and had bony union with the bone stump. The optical density of the fresh bone in the experimental side was higher than that of the control side, there was a significant difference between the two methods (P<0.05). Plenty of lamellar bones formed in experimental side and Haversian system, as well as red marrow, were observed.

CONCLUSIONTissue engineering bone with the structure of lamellar bones can be formed by the technology of BMSCs cell sheets.

Animals ; Bone Marrow Cells ; Bone and Bones ; Dogs ; Lactic Acid ; Mandible ; Osteoblasts ; Osteogenesis ; Polyesters ; Polyglycolic Acid ; Polymers ; Tissue Engineering

Objective:To investigate the application effect of the combined teaching model of digital 3D printed model and Tencent conference in case-based learning (CBL) teaching of oral and maxillofacial surgery.Methods:A total of 80 undergraduates in the classes of 2015 and 2016 were selected from School of Stomatology, Qingdao University. The students in the class of 2015 received traditional teaching, and those in the class of 2016 received the combined CBL teaching model of 3D printed model and Tencent conference. A questionnaire survey was used to evaluate the teaching effect, and theoretical examination was used to assess comprehensive abilities of the two groups. SPSS 24.0 was used to perform the chi-square test and the t-test. Results:There was no significant difference in the degree of satisfaction with teaching between the combined CBL teaching model of 3D printed model and Tencent conference and the traditional teaching model ( P>0.05), and both models were generally recognized and accepted by students. The experimental group had a significantly higher score than the control group (94.05±4.16 vs. 86.10±3.37, P<0.05). Conclusion:The combined teaching model of digital 3D printed model and Tencent conference integrates the advantages of the Internet and digital information and thus provides a certain reference for the teaching methods for other majors in stomatology.

Objective: To investigate the clinical manifestations, pathological features, and treatment of oral and maxillofacial pyogenic granulomas induced by camrelizumab. Methods: A case of pyogenic granuloma of the gums and lips caused by camrelizumab was reported along with a literature review. Results: After 4 months of treatment with camrelizumab for liver cancer, the patient developed systemic reactive capillary hyperplasia (RCH), followed by multiple masses on the lower lip and gingiva. After periodontal therapy, the masses on the lower lip and the gingiva were removed, and camrelizumab administration was stopped. The pathological result was gingival pyogenic granuloma/granulomatous hemangioma. No new masses were found in the oral cavity during postoperative follow-up. A review of the literature showed that RCH is the most common adverse drug reaction to camrelizumab but it occurs infrequently in the oral cavity. At present, the etiology of RCH has not been clarified, but the research has shown that camrelizumab may trigger tissue proliferation into hemangiomas by activating vascular endothelial cells, and the combined use of camrelizumab is safer than single use. RCH is self-limiting and most cases resolve spontaneously after discontinuation of the drug. If the mass causes dysfunction, surgical excision is feasible. Conclusion Camrelizumab can cause oral and maxillofacial reactive capillary hyperplasia complicated by pyogenic granuloma.