Objective To investigate the effect of Micro-class in orthodontic practicum for five-year undergraduate students in stomotology. Methods Experimental comparative method was used on two groups of undergraduate students. A total of 70 students in Grade 2011 were taught with traditional teaching mode as the control group, while 50 students in Grade 2012 were taught with Micro-class lecture as the observation group. The satisfaction questionnaires were distributed to both groups after the course to facilitate the eval-uation of teaching methods, which specifically was done by SPSS 21.0 for t test and Chi-square test. Results The results of survey showed that the satisfaction of the observation group was significantly higher than that of the control group, which exemplified in the studying interest inspiration, studying efficiency improvement, further development, and overall satisfaction [(4.00±0.73) vs. (3.05±0.77); (4.06±0.65) vs. (3.06±1.01);(4.86±0.35) vs. (2.64±0.80); (4.32±0.47) vs. (2.62±1.08)], (P<0.01). Conclusion Micro-class can improve the teaching quality, and it is meaningful to apply the micro-class in orthodontic practicum.

OBJECTIVETo investigate the content and activity of M-phase promoting factor (MPF) in pleomorphic adenoma, mucoepidermoid carcinoma, buccal carcinoma and normal tissue, in order to evaluate the role of MPF in the development of tumor and the relationship between MPF and malignant degree.

METHODSThe content and activity of MPF were assessed by immunobloting and Gollicano method.

RESULTSThe cdc2 and cyclinB (two subunits of MPF) were found both in normal and tumor tissues, and their content in tumor was higher than normal tissues. Buccal carcinoma was 64% higher than normal tissues. The activity of MPF in carcinoma was higher than normal tissue and had positive relation with the malignant extent.

CONCLUSIONSThe content and activity of MPF in tumor are higher than normal tissue. PKC can activate MPF. These results show PKC may promote tumor proliferation by activating MPF and also, the activity of MPF has some relation with malignant extent.

CDC2 Protein Kinase ; analysis ; Cyclin B ; analysis ; Humans ; Immunoblotting ; Maturation-Promoting Factor ; analysis ; Mouth ; chemistry ; Mouth Neoplasms ; chemistry ; Protein Kinase C ; physiology

Malocclusion,identified by the World Health Organization(WHO)as one of three major oral diseases,profoundly impacts the dental-maxillofacial functions,facial esthetics,and long-term development of～260 million children in China.Beyond its physical manifestations,malocclusion also significantly influences the psycho-social well-being of these children.Timely intervention in malocclusion can foster an environment conducive to dental-maxillofacial development and substantially decrease the incidence of malocclusion or reduce the severity and complexity of malocclusion in the permanent dentition,by mitigating the negative impact of abnormal environmental influences on the growth.Early orthodontic treatment encompasses accurate identification and treatment of dental and maxillofacial morphological and functional abnormalities during various stages of dental-maxillofacial development,ranging from fetal stages to the early permanent dentition phase.From an economic and societal standpoint,the urgency for effective early orthodontic treatments for malocclusions in childhood cannot be overstated,underlining its profound practical and social importance.This consensus paper discusses the characteristics and the detrimental effects of malocclusion in children,emphasizing critical need for early treatment.It elaborates on corresponding core principles and fundamental approaches in early orthodontics,proposing comprehensive guidance for preventive and interceptive orthodontic treatment,serving as a reference for clinicians engaged in early orthodontic treatment.

Objective: The aim of this study is to summarize the experience of the orthognathic surgical treatment forsecondary maxillary deformities following the cleft lip and palate repair. Methods: Twenty-two patients with secondary maxillary deformities following the cleft lip and palate repairment(orthognathic approach), were retrospectively analyzed.All the cases were treated in the Hospital of Stomatology, China Medical University from January 2007 to December 2016. There were 9 males and 13 females, ranging from 18 to 24 years in age. Only 3 of those cases were not undergone preoperative and postoperative orthodontic treatments. The anteroposterior maxilla and mandible discrepancy was 6-11 mm preoperatively. The modified surgical procedures are as follows: One-stage alveolar bone graftand maxillary osteotomy were performed for unilateral cleft patients; Internal fixation with micro-plate at the alveolar cleft region was performed to stabilize the maxillary dental arch intraoperatively; Intermolar wire ligation and palatal arch were used to control the width of maxilla intraoperatively and 1 month after operation; 2-3 mm overcorrection for the Le Fort Ⅰ advancement was produced to reduce relapse in sagittal direction. Mandibular set back was performed using bilateral sagittal split osteotomy at the same time. Rigid internal fixation with titanium palates and screws was applied for all the cases. All patients had been followed up for 1 to 2 years postoperatively. Results: Most of the patients had satisfactory facial proportion, and good and stable occlusion relationship, with only one patient developed severely uncontrollable relapse to class Ⅲ malocclusion, and 3 patients experienced relapse resulted in edge to edge incisor relationship. Conclusions Le Fort Ⅰ osteotomy combined with bilateral sagittal split osteotomy was effective to correct the secondary maxillary deformities following the cleft lip and palate repair. The treatment plan should be individualized, depending on the patients′ occlusion relationship, skeletal deformity, and facial appearance as well. It is necessary to modify the surgical techniques of Le Fort Ⅰ osteotomy for the cleft patients.