This paper has analysed the particularity of practice and teaching of oral and maxillofacial surgery.Binding with the change of medical pattern in recent years,the change of relation of doctors and patients as well as the present of "the People's Republic of China Practical Doctor Law"and "Rules of Sitling Malpractice",it has discussed that we should simultaneously think highly of raising to practice ability, reinforcing education of medical ethics, emphasizing legal consciousness and deepening ethics idea during practice teaching of oral and maxillofacial surgery,which can ensure well development of interns.

Objective To observe the effects of nerve growth factor (NGF) on growth of human hair follicles in vitro. Methods NGF was added to the model of human hair follicles in vitro. The length and the DNA synthesis rate of human hair follicles in vitro were measured. Results We found both 100 ?g?L -1 NGF and 125 mg?L -1 minoxidil significantly accelerated the growth of human hair follicles in vitro (P

The residual crown and root has very important physiological significances,but there are many problems in the clinical treatment,such as overtreatment and defensive treatment,etc.This article analyze the background and causes of these problems,and provids some corresponding ways to solve them.

As an exposing part of the human body,facial surface is easy to be injured in our daily lives.With the increase of living standards,the patients have an ever more urgent require for aesthetic treatment for the medical and plastic surgical treatment for the exposing parts of body,especially for the facial surface.But we found in the clinical work some aesthetic treatment were not satisfying,and some patients even needed a second restitution.We have analyzed the reasons for this phenomenon and proposed some corresponding solving methods.

This article mainly discusses the psychological characteristics of patients in orthodontic practice on the view of medical ethics. To achieve good relationship and cooperation between doctors and patients, be helpful to lighten patients' burden and to complete treatment successfully by strengthening the ethical education on orthodontic doctors and right education on patients and giving psychological guidance.

Tissue engineering of oral and maxillofacial surgery is a newly subject and animportant branch of tissue engineering. The study is to evaluate fundamental medical ethics principle in the tissue engineering of oral and maxillofacial surgery on the view medical ethcs. Strengthening the ethical education on oral and maxillofacial surgeon and right education on patients are in favor of development of tissue engineering in the oral and maxillofacial surgery.

This article mainly discusses the psychological characteristics of old patients having tooth pulled out on the view of medical ethics and tries to acquire its corresponding countermeasures.Through strenghtening the ethical education on oral and maxillofacial surgeons and giving right guidance to patients,it's helpful to lighten patients' burden and achieve good relationship and cooperation between doctors and patients to complete treatment successfully.

According to the characteristic of the practice in the outpatient dentofacial surgery,we analyzed the prominent contradiction in the process.With the progress of the medical service law and the innovation of the medical treatment mode,we must pay more attention to the ethics problems on the medical education.Before practice,we must strengthen the students' training in stimulator,the concept of legal,ethics,communication skill and so on.Teachers and hospitals should take the responsibility.The relevant laws and regulations ought to be modified step by step to ensure the practice.

Objective To investigate the relationship between the co-expression of CD105 and cyclin D1 and lymph node metastasis and prognosis of esophageal squamous cell carcinoma ( ESCC ). Methods Eighty cases of ESCC tissue were collected at The First People's Hospital of Nantong. The expression of CD105 and cyclin D1 of ESCC was detected by immunohistochemistry. The relationship between the co-expression of CD105 and cyclin D1 and lymph node metastasis and prognosis of ESCC was analysed. Eighty normal esophageal tissues were selected as controls. All data were analysed by t test, chi-square test, and Pearson correlation analysis. Survival was analysed by the Kaplan-Meier survival curve. Microvessel density (MVD) was used to indicate the expression of CD105 in the form of -x±s. Results The expression of CD105 in ESCC tissues was higher (36±8) than that in normal esophageal tissues ( 11±3) (t =25. 129, P＜0.05). The positive rate of cyclin D1 expression in ESCC tissues was 61% (49/80), which was significantly higher than 23% (18/80) in normal esophageal tissues ( x2 =4.972, P＜0.05). The MVD value of 44 patients was ≤36 (LCD105), and nine of them had lymph node metastasis. The MVD value of the remaining 36 patient was ＞ 36 ( HCD105 ), and 26 of them had lymph node metastasis. Twenty-eight patients with positive expression of cyclin D1 had lymph node metastasis, while seven patients with negative expression of cyclin D1 had lymph node metastasis. The results of Pearson correlation analysis revealed that a high expression of CD105 and a positive cyclin D1 expression were correlated with lymph node metastasis (x2 =21.562, 9.217, P＜0.05). The survival times of 28 patients with positive cyclin D1 and HCD105,21 patients with positive cyclin D1 and LCD105, eight patients with negative cyclin D1 and HCD105, and 23 patients with negative cyclin D1 and LCD105 were (31±6) months, (47±7) months, (51±9) months and (61±5) months, respectively, with a significant difference among the four groups (F = 11.76, P ＜ 0. 05 ).Conclusion Co-expression of CD105 and cyclin D1 may be used as a prognostic factor of ESCC.

Overtreatment is not only an economic phenomenon, but also an ethics problem at the same time. It is precisely a medical - social problem. This paper analyzes the reasons of overtreatment in oral disease from the view of medical elthics. Furthermore, it provides the strategy which the doctor, the patient, the medical establishment and the social shoud be adopted on overtreatment in oral disease.