Zhonghua ya yi xue hui za zhi最新文献

Histopathologic effects of electric dosage in iontophoresis on dental pulp. 电剂量离子导入对牙髓的组织病理学影响。

Zhonghua ya yi xue hui za zhi Pub Date : 1991-09-01

W H Lan

{"title":"Histopathologic effects of electric dosage in iontophoresis on dental pulp.","authors":"W H Lan","doi":"","DOIUrl":"","url":null,"abstract":"It is well recognized that dental pulp is very sensitive to electricity. However, the extent of damage and the repair capacity of pulp tissue after the electrical excitation of iontophoresis remains to be determined. Electrical current was applied to the simian teeth via cavities on the buccal or occlusal surfaces. The current strength was set at 0.1 mA-0.4 mA. The application duration was either 1 minute or 3 minutes. The total dose of electricity received by the iontophoresed teeth varied from 0.1 mA-minute to 1.2 mA-minutes. The pulps were microscopically examined at 4, 8, and 12 weeks after electrical excitation. All of the teeth were collected and processed using routine histologic methods. The following results were obtained: (1) in the group with 1-minute iontophoresis, the histologic pictures showed no apparent differences among the specimens regardless of the strength of the current applied; (2) in the group with 3-minute iontophoresis, the pulpal response correlated positively with current strength; and (3) with an electrical current of no greater than 0.4 mA and an application period of less than 3 minutes, the pulpal changes were reversible. We conclude that iontophoresis may accelerate the repair process, if the application duration is less than 3 minutes.","PeriodicalId":77649,"journal":{"name":"Zhonghua ya yi xue hui za zhi","volume":"10 3","pages":"80-7"},"PeriodicalIF":0.0,"publicationDate":"1991-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12982970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

[Primary culture of human gingival tissue cells in vitro]. 人牙龈组织细胞的体外原代培养。

Zhonghua ya yi xue hui za zhi Pub Date : 1991-09-01

S D Hwang, Y J Shun, C L Meng

引用次数: 0

[Treatment of subgingival crown root fracture: forced eruption--case report]. 【龈下冠根骨折的治疗:强制出牙1例】。

Zhonghua ya yi xue hui za zhi Pub Date : 1991-09-01

W H Lai, L S Lay, C T Wu

引用次数: 0

Mandible metastasis as the initial manifestation of breast carcinoma--report of a case. 乳腺癌以下颌骨转移为首发表现——附1例报告。

Zhonghua ya yi xue hui za zhi Pub Date : 1991-09-01

S Y Lu, L Chen

引用次数: 0

Tensile bond strength of reused orthodontic metal brackets. 重复使用正畸金属托槽的拉伸粘结强度。

Zhonghua ya yi xue hui za zhi Pub Date : 1991-03-01

J K Liu, M Y Tsai, P H Huang

引用次数: 0

[In vitro effect of topical fluoride gels on the surface of composite resins]. 外用氟化物凝胶在复合树脂表面的体外作用

Zhonghua ya yi xue hui za zhi Pub Date : 1991-03-01

S T Yeh, R S Chen, J S Hung

引用次数: 0

[Survey on oral hygiene status in children with Down's syndrome and mental retardation]. 唐氏综合征伴智力低下儿童口腔卫生状况调查

Zhonghua ya yi xue hui za zhi Pub Date : 1991-03-01

C T Kao, M Y Chou

引用次数: 0

The evaluation of horizontal reference planes of adult Chinese in natural head position. 成人自然头位水平参考平面的评价。

Zhonghua ya yi xue hui za zhi Pub Date : 1991-03-01

C H Hung

{"title":"The evaluation of horizontal reference planes of adult Chinese in natural head position.","authors":"C H Hung","doi":"","DOIUrl":"","url":null,"abstract":"A group of 112 adult females (average age 25.66) and 104 adult males (average age 25.62) were subjected to cephalometric evaluation in their natural head position. No significant differences were found in the nasionsella (SN) plane, Frankfort horizontal (FH) plane or palatal planes between male and female subjects. The SN plane was found to be located at 7.26 degrees above the true horizontal on the average, and the FH plane differed on the average 1.92 degrees from the true horizontal with the line diverging forward and upward. The palatal plane was found to be located in a downward and forward direction at 1.17 degrees from the true horizontal plane on the average. The orbitale (Or) was found to be located at 2.34 mm on the average above the true horizontal plane depicted from the porion (Po) in this study, which implies that the racial characteristic of a high zygomatic bone in Chinese may have some influence upon the position of Or, and this should be taken into consideration when the FH plane is used as the true horizontal during face bow transfer. The mandibular plane (MP) angle, occlusal plane (OP) angle and the gonial angle (GA) of males were found to be smaller than those of females, with a significant difference at the level of P less than 0.001, P less than 0.01 and P less than 0.01, respectively. The upper facial divergent angles of males and females were quite similar, as reflected by the similarity in the SN-FH angles and SN-PP angles between the sexes A significant difference was found to exist in the lower facial divergent angles between males and females. The SN-MP angle, PP-OP angle and PP-MP angle were all significantly smaller in males, with a P less than 0.001. The OP-MP angle was also smaller in males with P less than 0.05.","PeriodicalId":77649,"journal":{"name":"Zhonghua ya yi xue hui za zhi","volume":"10 1","pages":"20-9"},"PeriodicalIF":0.0,"publicationDate":"1991-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12982967","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Antibacterial mechanisms of lysozyme on Streptococcus mutans. 溶菌酶对变形链球菌的抑菌机制。

Zhonghua ya yi xue hui za zhi Pub Date : 1990-09-01

Y B Wang

引用次数: 0

[Age changes in location of mandibular foramen]. [下颌孔位置的年龄变化]。

Zhonghua ya yi xue hui za zhi Pub Date : 1990-09-01

T J Hwang, S C Hsu, Q F Huang, M K Guo

{"title":"[Age changes in location of mandibular foramen].","authors":"T J Hwang, S C Hsu, Q F Huang, M K Guo","doi":"","DOIUrl":"","url":null,"abstract":"In order to understand the changes in location of the mandibular foramen with age in children, lateral cephalometric radiographs from 112 child and adult patients, including both males and females, were randomly selected according to age. The subjects were divided into 6 age-groups; 3, 5, 7, 9, 11 and adult. Certain lines and points were traced on the radiographs used. The location of the mandibular foramen was identified by two persons. The perpendicular distance from the center of the mandibular foramen to the occlusal plane and the location of the mandibular foramen relative to the ramus height (Ar-Kk), as well as to the ramus width (a-p), were measured. The mandibular foramen was located 4.12 mm below the occlusal plane at the age of 3. It subsequently moved upward with age. By the age of 9, it had reached approximately the same level as the occlusal plane. The foramen continued to move upward to 4.16 mm above the occlusal plane in the adult group. The height percentage averages ranged from the lower 1/3 of the ramus height in the 3 year-old group to the middle of the ramus height in adults. The depth percentage averages ranged from 67.8% in 3 year-old children to 61.7% in adults. For greater accuracy in anesthetic procedures, dentists should relate the locational changes in the mandibular foramen with age when performing block anesthesia for the inferior alveolar nerve.","PeriodicalId":77649,"journal":{"name":"Zhonghua ya yi xue hui za zhi","volume":"9 3","pages":"98-103"},"PeriodicalIF":0.0,"publicationDate":"1990-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13289986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0