Objective To compare difference of clinical effect of reformed interocclusal lip arch appliance and conventional moved maxillary bite plate appliance in the interceptive orthodontics in the treatment of deciduous anterior crossbite .To search an appro-priate interceptive orthodontics treatment of deciduous anterior crossbite .Methods 50 cases of deciduous anterior crossbite were randomly divided into 2 groups(25 cases in each group) .The improvement group underwent a modified appliance therapy ,and the control group were treated with conventional bite appliance ,then we compared the clinical efficacy of the two groups .Results All the cases with the deciduous anterior crossbite were cured .After treatment ,the maxillary anterior teeth and soft tissue profile of all the patients were improved .In the improvement group the changes of the mandible ,the mandibular anterior teeth ,and the concave profile improving have more significant efficiency than those in the control group .Conclusion Both kinds of appliance could cure the deciduous anterior crossbite .The reformed interocclusal lip arch appliance has both the mechanical and functional effects and be-fits in those overbite cases ,it can be an effective interceptive treatment of children with anterior crossbite .The modified appliance group can get more harmonized profile .

The cultivation of medical and health personnel in the rural areas is currently confronted with severe challenges: very few graduating students go and work in the poverty-stricken or mountainous areas and there is a shortage of rural medical and health personnel. An effective mechanism for solving the problem in a short time has been the establishment of medical and health personnel training centers that recruit students specifically from the mountainous and poverty-stricken areas and assign them back there upon graduation. It has promoted the development of unique curriculums designed specifically for the training of personnel specializing in clinical medicine from rural grassroots. The establishment of long-term mechanisms that ensure the support of the development of the rural medical and health cause by urban medical and health human resources strongly guarantees the development of rural in-service education and non-academic training.

BACKGROUND: Micro-implant screws as an absolute anchorage, instead of traditional anchorage that requires patient's high matching and affects beauty, has been paid more attention.OBJECTIVE: To compare the changes in 3 different places following implantation of micro-implant screws. DESIGN, TIME AND SETTING: The controlled study was performed at the Hospital of Stomatology Affiliated to Foshan College of Sciences and Technology from January 2004 to December 2007.PARTICIPANTS: A total of 45 patients who demand powerful anchorage during the orthodontic treatment were assigned to 3 groups: free gingiva group, mucogingival junction group, and mucosa group.METHODS: By using incomplete flap micro-implant screw implantation, micro-implant screws were implanted in the free gingiva, mucogingival junction and mucosa, with 30 screws in each area.MAIN OUTCOME MEASURES: Loosening and defluvium of micro-implant screws were measured. Pain duration and degree were determined in patients undergoing implantation of micro-implant screws 7 days following surgery. Soft tissue surrounding the micro-implant screws and bleeding rate during probing were detected 56 days following surgery.RESULTS: The number of screw loosening was greatest in the free gingiva group (9 screws), while lowest in the mucogingival junction group (2 screws). Patients suffered from severe flare and pain in the mucosa, and the reaction was mild in the free gingiva following implantation. The reaction was not obvious, but severe pain was found in the mucogingival junction following implantation compared with the free gingiva. Soft tissue surrounding the micro-implant screws and bleeding rate during probing were greater in the mucosa group than in the free gingiva group and mucogingival junction group (P<0.05).CONCLUSION: The incomplete flap micro-implant screws in the mucogingival junction contribute to the increase in success implantation rate and the decrease in inflammatory degree, and prevent the occurrence of potential risk.

OBJECTIVEThe aim of this study was to evaluate quantitatively the effectiveness and feasibility of the modified supracrestal fiberotomy (MSF) and the contact point reproximation (CPR) in decreasing the relapse of anterior segments rotating and/or crowding after orthodontic treatment.

METHODSA total of 129 patients with crowding and/or rotated anterior teeth were selected for this study, and the average age was 13.07 years (54 males, 75 females). The modified supracrestal fiberotomy was performed on the anterior segments of patients in the experimental group (48 cases). After the anterior teeth were aligned, 23 of the 48 cases received a further treatment of the contact point reproximation on the anterior segments (the subgroup of MSF + CPR), and the other 25 subjects did not receive this treatment (the subgroup of MSF). The control group consisted of 81 cases. All cases wore Hawley retainers for 1.8 to 2.3 years, and all the patients were revisited 2.4 years postretention. The maxillary and mandibular dental models of all the patients were taken before treatment (T1), at the end of the treatment (T2) and 2.4 years postretention (T3).

RESULTSThe relapse rate in the experimental group [(T3-T2)/T1 x 100%] was 21.6%, lower than that in the control group (P < 0.001). The relapse rate of mandible in the subgroup of MSF + CPR was 6.56% lower than that of the subgroup of MSF (P < 0.05). But the relapse rate of maxillary in the subgroups of MSF + CPR was similar as that of the subgroup of MSF (P > 0.05).

CONCLUSIONThe modified supracrestal fiberotomy can effectively alleviate relapse after orthodontic treatment of the crowding and/or rotation of anterior teeth. The treatment combining MSF and CPR can help maintain the stability of post-retention of mandibular anterior teeth.

Adolescent ; Child, Preschool ; Female ; Humans ; Male ; Malocclusion ; therapy ; Orthodontics, Corrective ; methods ; Risk Factors ; Rotation ; Secondary Prevention ; Sex Factors ; Statistics, Nonparametric ; Tooth Extraction ; Tooth Movement Techniques ; Treatment Outcome

Objective : To investigate whether the RW-splint could be used to guide or determine the CR position of the lower jaw so as to provide help for the later diagnostic design. Methods: 20 class ⅡⅠ malocclusion patients were recruited in orthodontic department of Foshan Stomatological Hospital. They were treated by RW-splint for half a year before orthodontic treatment. The overjet of anterior teeth were recorded before and after treatment. Results : The overjet of anterior teeth was (6.792 ± 0.795) mm before treatment and (7.720 ± 0.930) mm after half a year's treatment. The overjet of anterior teeth had significant difference (t=6.319, P <0.01). The overjet change of anterior teeth between before treatment and half year after treatment was (0.928 ± 0.657) mm. Conclusion The RW-splint wearing before treatment can be used to guide or determine the mandible in the CR position.

Objective : To explore the clinicopathological features, diagnosis, treatment and prognosis of sclerosing polycystic adenosis (SPA) and provide a reference for clinics. Methods : A case of sclerosing polycystic adenosis of the parotid glands was retrospectively analyzed, and the relevant literature was reviewed. Results : A 57-year-old female patient presented with a tumor, which she had noticed for half a month, on the left side of the lower ear, with occasional paroxysmal numbness and no complaint of other discomfort. Resection of the left submandibular area tumor was performed, and the tumor specimen pathological results showed sclerosing polycystic adenosis of the left parotid gland, with no recurrence after six-months follow-up. Sclerosing polycystic adenosis is rare, occurs in the parotid gland and is characterized by a frequently painless, slow-growing mass of the parotid gland. Imaging examination and fine needle aspiration biopsy can only be used as a reference; the diagnosis must include a pathology examination. Histological manifestations showed that abundant sclerotic collagenous stroma was permeated by ductal and acinar lobules, and cystic dilatation of the duct was accompanied by epithelial hyperplasia and diverse ductal cells. Immunohistochemistry of the ductal and acinar cells showed positive expression of cytokeratin (AE1-3 and CAM5.2) and S100 protein. The ducts filled with hyperplastic and dysplastic epithelium were surrounded by an intact myoepithelial layer that was positive for SMA, p63, and calponin, with a Ki-67 index less than 3%. Treatment comprised mainly surgical resection, with a good prognosis. However, one-third of cases relapse: low-grade malignant tumors may occur, with at least one report of invasive cancer. Conclusion Sclerosing polycystic adenosis of the salivary gland is rare and has a good prognosis, but patients may relapse easily after surgery. The diagnosis depends primarily on pathological examination. The main treatment is surgical resection, the prognosis is good, and follow-up should be strengthened after surgery.