[Effects of different psychological interventions on relieving orthodontic pain in patients with different personalities: a preliminary study].

PURPOSE: To investigate the effects of different psychological interventions on relieving orthodontic pain in patients with different personalities. METHODS: Three hundred patients were involved and randomized into five groups:control group, cognitive therapy group, music therapy group, muscle relaxation group and suggestion therapy group. Eysenck personality questionnaire was used to evaluate personality traits of patients, and visual analogue scale (VAS) was used to assess patients' intensity of orthodontic pain at 2, 6, 12, 24, 48 and 72 h after initial archwire placement.The VAS scores were analyzed via repeated measures analysis of variance with SPSS 16.0 software package. RESULTS: The cognitive group,music group, muscle relaxation group and suggestion group were reported lower pain than control group (P<0.001). The music group showed a greater decrease in VAS than other four groups in patients with a tendency of extroversion and stable mood (P<0.01).The suggestion group showed less pain than cognitive group in patients with a tendency of extroversion and unstable mood (P<0.05).For patients with other personality traits, there was no significant difference among the four intervention groups. CONCLUSIONS: Cognitive therapy, music therapy, muscle relaxation and suggestion therapy could relieve orthodontic pain effectively. For patients with a tendency of extroversion and stable mood, music therapy was the first choice to control orthodontic pain. Cognitive therapy could be used for patients with other personality traits.

[Value of multi-slice spiral CT with three-dimensional reconstruction in the diagnosis of neoplastic lesions in the jawbones].

OBJECTIVE: To assess the value of multi-slice spiral CT (MSCT) with three dimensional (3D) reconstruction in the diagnosis of neoplastic lesions in the jawbones. METHODS: Thirty-three patients with neoplastic lesions of the jawbones underwent MSCT scanning with 3D reconstruction. Of these patients, 14 had ameloblastoma, 8 had hemangioma, 3 had osteosarcoma, 3 had ossifying fibroma, 2 had chondrosarcoma, 2 had fibrosarcoma, and 1 had odontogenic myxoma. Preoperative MSCT scanning was performed with the slice thickness of 2 mm, and 3D reconstruction of the images was conducted by means of multi-planar reconstruction (MPR), curved-planar reformation (CRP), and 3D volume rendering technique (VRT). The results were compared with those observed during the operations. RESULTS: In the 33 cases, the neoplastic lesions of the jawbones were displayed by 2D or 3D imaging and confirmed by intraoperative findings. Two-dimensional imaging allowed better observation than 3D imaging of the deep structures, whereas 3D imaging was superior in visualizing the morphological changes of the compromised bones and the spatial relationship between the tumors and surrounding structures. Two-dimensional imaging and MPR were excellent in revealing the internal structures and pathological changes of tumors, having also better performance in showing the tumors involving the soft tissues. Benign tumors were most visualized as bone expansion changes with well defined ovoid or lobulated borderlines, and malignant ones often resulted in adjacent bony destruction and soft tissue masses. CONCLUSION: MSCT examination is useful in defining the scope of tumor involvement and bony changes to help in the definite diagnosis, differential diagnosis and choice of clinical treatment. Two-dimensional imaging, MPR, VRT and CRP have their respective advantages and limitations in showing jawbone tumor, and their combination can be of great clinical value.

[A survey of the therapeutic reason of orthodontic patients in Luzhou].

OBJECTIVE: To investigate the therapeutic reason of orthodontic patients in Luzhou. METHODS: A questionnaire investigation was made for the following randomly chosen people: 452 teenage patients from orthodontic department of stomatology hospital affiliated to Luzhou Medical College were brought into treatment group. 600 students from Luzhou No. 2 Middle School were brought into non-treatment group. The questionnaire investigation was conducted to two groups. The results were statistically analysed with SPSS 10.0. RESULTS: (1) The main aim for orthodontic treatment was to align the teeth. (2) 37.39% of the patients accepted orthodontic treatment for parent's demand. (3) 76.1% of the patients expected to align the dentition. (4) Most people in treatment group could accept the time and expenses in the orthodontic treatment, but most people of non-treatment group could not accept the expenses in the orthodontic treatment. (5) Most people thought appearance was important. CONCLUSION: Aesthetic is the main reason for orthodontic patients.

[Clinic study of root resorption caused by edgewise appliance combined with flat bite plate treatment ].

OBJECTIVE: To study the root resorption caused by edgewise appliance combined with flat bite plate treatment. METHODS: 65 patients with edgewise technique and flat bite plate treatment were chosen. All patients were taken panoramic radiograph before flat bite plate treatment, immediately after flat bite plate treatment and 6 months after flat bite plate treatment. Root resorption grade of mandibular permanent incisors were analyzed. RESULTS: There were statistical difference in the root resorption grade of three groups (P < 0.05), but there was no statistical difference between male and female (P > 0.05). CONCLUSION: Flat bite plate can cause root resorption of mandibular permanent incisors, but the root resorption is slight.