Dental Occlusion ; Humans ; Oral Medicine

Computer-Aided Design ; Dental Prosthesis Design ; methods ; Humans ; Oral Medicine ; methods ; Research Design ; Technology, Dental ; methods

Objective: To follow up patients received orthognathic surgery Method:108 patients were assessed with SCL-90 five times during the study, that was the time before the operation, after the operation, 3 month, 6 month and 12 months later Result: After operation, three subscores of SCL-90 increased significantly, they were anxiety, depression and hostility From the third month after the operation, the score of SCL-90 began to decrease Both results of the 6th month and 12 th month were significantly lower than that before the operation Patients felt more confident and happy at the end of one year Conclusion:There is a process of psychological adaptation to orthognathic surgery, which lasts for half a year

Objective To study the blood flow dynamic c hanges after mitral valve replacement(MVR) operation in patients with mitral valve stenosis by color Doppler echocardiography. Methods Thirty-seven- patients with mitral stenosis after MVR operation were analyzed with color Doppler echocardiography retrospectively, the observed items including dimension of left atrium, tricuspid valve backflow velocity, pulmonary artery systolic pressure(PAPS) and left ventricular ejection fraction(LVEF).Relativity analysis was conducted between PAPS and trans-mitral valve pressure(MV?P). Results All the patients survived healthy, the average follow-up time was 15.8- months. The follow-up data suggested that the dimension of left atrium, tricuspid valve backflow velocity and PAPS decreased significantly while LVEF increased significantly to the pre-operation. PAPS was in positive correlation with MV?P and the difference between PAPS and MV?P increased according to MV?P.Conclusions MVR can ameliorate flow dynamics effectively in patients with mitral stenosis, PAPS is in positive correlation with MV?P, senior stenosis existed within pulmonary circulation in patients with severe pulmonary hypertension.

Objective:To investigate the oral-maxillofacial pain and t he surface electromyographic (EMG) activity of masseter muscles and anterior and posterior portions of temporalis muscles after experimental interference. Methods:A cast onlay of 0.5 mm in height was placed on the right low er first molar and remained for three days in 10 adult volunteers with normal oc clusion and without any symptom of TMD. The oral-maxillofacial pain was continu ously scored on a visual analogue scale(VAS)by the subjects before and after t he placement of the onlay. At the same time, the integral data of surface EMG we re recorded, and then the asymmetry index of the activity of bilateral muscles w as calculated. Results:Three days after the placement of the occ lusal highspot, all the subjects complained oral-maxillofacial pain. 8 of them had headache in right temporal region with VAS value of 1~4; the activity of tem poralis anterior at rest position of mandible was increased significantly (P

Objective: To compare trophic effects of soluble substances derived from Schwann cells (SC) of neonatal and Wallerian degenerating segments of rats on facial motoneuron (FMN) cultures. Methods: Serum-free conditioned media of Schwann cell cultures (SC-CM) from facial and sciatic nerves of neonatal and Wallerian degenerating segments in adult rats were individually collected and concentrated by ultra-filtration with molecular weight cut-off at 30 000 and 10 000. The growth activities of FMNs in vitro were determined by means of MTT assay under the condition of serum-free medium added with different components of concentrated SC-CMs (SC-CMCs). The absorbance values were then statistically analyzed. Results: Survival and growth rate of FMN cultures in four kinds of SC-CMCs were significantly higher than that in media both with serum and non-serum and the difference between SC-CMCs was not statistically significant (P>0.05). Neurotrophic molecules were predominantly protein or peptide components with relative molecular weight larger than 30 000 and their trophic activity was positively related to total protein concentration in SC-CMCs. Conclusion: There were soluble trophic molecules with relative molecular weight larger than 30 000 for survival and neurite growth of FMN cultures in media with SC-CMCs derived from facial and sciatic nerves of neonatal rats and with SC-CMCs derived from Wallerian degenerating facial and sciatic nerves of adult rats. It might be reasonable to choose SC from sciatic nerves of rats on account of the findings from SC cultures on facial motoneurons.

Objective To investigate the phonological characteristics of patients with functional speech problems. Methods Ninety patients with functional speech problems were classified by speech analysis. All types of speech problems were analyzed. Results The functional speech problems can be categorized as unaspiration, palatalization, lateralization, fronting of tongue, backing of tongue, plosion, omission of consonants, glottal stop, affrication and backing of tongue and nasalization. Backing of tongue and nasalization was only related to the consonant l, and the unaspiration was often related to such consonants as p, t, k, q, c, ch. Conclusion The functional speech problems were related to consonants. There was regularity with the involvement of the consonants in different types of functional speech problems.

Objective To study if visco-supplementation therapy is useful to the internal derangement (ID) of temporomandibular joint (TMJ).Methods Sixty-three ID cases (69 TMJs) were studied by visco-supplementation therapy. The upper and/or lower articular cavities were irrigated with 5 ml normal saline and injected 0.3-1.0 ml 1% hyaluronate (HA) into articular cavity. If the symptoms of the disease still existed one week later, the therapy should be repeated for 1-2 times, once a week. The control group cases were injected 1 ml 2% lidocaine instead of HA. 8 other TMJs of 6 ID cases and 2 normal cadavers were studied with scanning electron microscopy (SEM) and light microscopy (LM).Results The visco-supplement therapy was useful to ID patients. The difference between the test group and control group had statistical significance (χ2=6.6535, P<0.01). SEM and LM showed that the condyle, disc and bilaminar region in ID were degenerated or destroyed.Conclusions The friction between the articular surfaces in ID was increased and the bilaminar region could not retract the disc as in healthy TMJ. The visco-supplementation therapy can decrease the friction and resume the normal rheology of the diseased TMJs.

Objective　To investigate the effect of different operative techniques and fixed methods on the TMJ condylar position and remolding process. Methods　 The standard Schuller′s position radiographs were used to examine the postoperative temporomandibular joint form and condylar position changes of 57 cases within one week and one year after orthognathic surgery. The form changes were divided into three types. Type I was that the joint form was normal or abnormal before the operation and no significant change was found after the operation. Type Ⅱ was that the joint form was abnormal before but after the operation it was improved. Type Ⅲ was that the joint form was normal before but after the operation it changed into abnormal or it was abnormal before but after the operation it worsened. Results　① Changes of the condylar position had happened after the operations, but within one year the condyles had resumed the same position as the preoperative. The condylar displacements were not beyond the TMJ adaptabilities. Different operative techniques had different effects on the condylar positions. ②In 86.4% of cases, TMJs had undergone adaptable remolding (Type Ⅱ) or no significant changes (Type Ⅰ). Only 13.6% of cases, degenerative changes were found (Type Ⅲ). Conclusions　The effect of orthognathic surgery on the condylar position and TMJ form is significant, but most of the changes are within the normal adaptability of TMJ.

OBJECTIVETo investigate the activities of head, neck and upper trunk muscles with mandibular movement in normal adults.

METHODSThe integral data of surface electromyography (EMG) had been recorded to analyze the activities of anterior temporal (Ta), posterior temporal (Tp), sternocleidomastoid (SCM) and trapezius (TRAP) muscles with mandibular movement in ten normal adults.

RESULTSThe former mentioned muscles acted constantly when the mandible was in the rest position. The activities of Ta, Tp and SCM muscles increased with protrusion of mandible, mouth opening, tapping, maximum clenching, and chewing movements. The amplitudes of the increased activity of these muscles were correlated significantly with each other. When the activities of Ta and Tp muscles increased to 56 times and 25 times respectively, the activity of SCM muscle increased to 5 - 6 times. The activity of trapezius muscle increased with protrusion of mandible and opening movement, but tended to stop with the maximum clenching and chewing movement. The correlations of left and right sides of the same muscles had been found.

CONCLUSIONSThe muscles of head, neck and upper trunk can act as contributors to keep the mandibular positions and take part in the mandibular movements.

Adult ; Electromyography ; Female ; Head Movements ; physiology ; Humans ; Male ; Mandible ; physiology ; Mastication ; physiology ; Movement ; Muscle, Skeletal ; physiology ; Neck Muscles ; physiology ; Range of Motion, Articular ; Shoulder ; physiology ; Temporomandibular Joint ; physiology