[A study of errors of radiography in 10000 intraoral periapical radiographs].

A total of 10000 full-mouth radiographs (10000 periapical radiographs were evaluated for radiographic errors.The result showed that four major types of errors were found in this study,They are cone cutting(5.59%),incorrect vertical angulation(38.

[The evaluation of panoramic sialography applied in the diagnosis of parotid tumas].

Panoramic sialography is a new method applied in the diagnosis of parotid tumors.we have examined 33 cases of parotid tumors by this way and: 1.In sialograms of benign tumors,we discovered obvious filling-deficiency areas and moving position of ducts as well as margins of mass.

[The treatment of unilateral true ankylosis of TMJ with maxillomandibular deformities].

The authors described a surgical procedure for the treatment of unilateral true ankylosis of TMJ with maxillomandibular deformities.The surgery included arthroplasty and Le Fort I maxillary osteotomy in one or two stages.It successfully not only restore the stomatognathic function with a maximum mouth opening in normal range,but also corrected malpositioned maxilla and mandible normal anatomic position.

[Establishment and clinical application of Chinese language clear degree].

This study was established the Chinese language of clear degree.The subjects of this study consisted of 50 patients with postoperative of cleft lip and palate,congenital velopharyngeal incompetence,and 30 control group were normal articulation of persons.The results of this study may be helpful for further clinic of the cleft lip and palate patients of speech therapeutics.

[Study of toxicity of iodophor,glutaradehyde and chlorhexidine to L929 Cells.].

We comparatively studied the toxicity of iodophor,glutaradehyde and chlorhexidine in different concentration and time.The result shows that the toxicity of iodophor to L929 cells is the lowest in all kinds of drug concentration and action time is much lower than that of glutaradehyde and chlorhexidine(P<0.05) with prolonging time.

[The design and application of speech signal processing system by computer in stomatology.].

In this study we established a computer bases on Speech Signal Processing System and changes of formant frequencies of the vowel/i/accompany the changes in the oral cavity after maxillary surgery and prosthodontic reconstruction.The study found the F1 for vowel/i/has no change,while the F2 peak significantly shifted between the preprosthetic and postprosthetic speaking condition after anterior resection of relative energy error value and the speech intelligible measured aurally(P<0.05).

[Clinic analysis of 46 cases of Sjogren's syndrome.].

Sjogren's syndrome (SS) is more common in female.Being lack of dryness in mouth and eyes,parotid gland swelling in early stage of majority patients,SS would be misdiagnosed.In a few cases,it may prominently manifest damage only in some system,such as liver and spleen enlargement,hyperglobulinemia etc,so that it would interfere the diagnosis.

[The clinical analysis of 39 cases of oral mucosal hyperplasia].

This study was reviewing in analysed the clinical,histopathological and treatment features of 39 cases suffered in oral mucosal hyperplasia.It definited the sorts of disease which may be malignant changed and the histopathological grading criteria of hyperplasis.The different treatment methods were administered according to the different grade of the malignant change.

[Rapid identification of anaerobes in periodontics with computer].

It has documented that anaerobe has played important roles in the progress of periodontitis.Recently,the detection of its pathogens has caught more and more attention.This study has sieved physiological and biochemical reactions of more than 80 species anaerobes related to periodontics,selected the reactions with identifying significances to form a system,and identify bacterium according to their differences of the results to the selected reactions.

[The clinical observation of tetracycline stained teeth covered by composite resin veneer induced of secondary gingivitis].

Using gingival index,sulcus bleeding index and plaque index of 765 tetracycline stained teeth covered by composite resin veneer after 1/2-3 years were observed.It was found that the incidence of gingivitis was over 60%.The reexamination after three months later showed that the three indexes were significantly improved by grinding teeth proper and teaching standard brushing method.

[Effects of potassium oxalate with fluoride gel on dentin hypersensitivity].

This study observed the potassium oxalate including fluoride gel on the reduction of dentin hypersensitivity both in clinic and in laboratory.The results of the clinical treatment showed that this gel was statistically significant in reducing dentin hypersensitivity when the teeth treating by the gel for 4 minutes.The results of the scanning electric microscope(SEM) research indicated that the gel could create micro-globed particles deposition on the dentine surface.

[A study on growth and development of maxillofacial region with vector analysis].

In order to observe the maxillofacial growth and development quantitatively, the vector analysis was applied in this study to divide Y axis,which is advocated in Downs method,into horizontal section and vertical one,from which the ratio of the facial growth separately in anterior and inferior direction was obtained.75 pieces of x ray films for various dental stages of Shanghaiese with normal occlusion were selected and their angle of Y axis together with their cotangents were measured. The results showed that the cotangent of those with mixed,early permanent and permanent dentition were separately 0.

[Reconstruction of post-traumatic maxillofacial deformity: Analysis of 100 cases].

This paper collects 100 cases with post-traumatic maxillofacial deformity.The types of deformity may be involved by order to concave appearance restricted opening of jaw,disturbance of occlusion,mimetic paralysis,scar,etc.The author advocate the treatment must be paid attention both appearance and function.

[An anesthetic study of 120 cases of orolingual tumor operations].

The anesthetic techniques of 120 cases of orolingual tumor operations was studied.The ages of 66 male and 54 female patients ranged from 7 months-77 years,averaging 48.5 years.