Taehan Ch'ikkwa Uisa Hyophoe chi最新文献

There has been much progress in Edgewise Appliance since E.H. Angle. One of the most important procedures in edgewise appliance is correct bracket position. Not only conventional edgewise appliance but also straight wire appliance & lingual appliance cannot be used more effectively unless the bracket position is accurate. Improper bracket positioning may reveal much problems during treatment, especially in finishing state. It may require either rebonding after the removal of the malpositioned bracket or the greater number of arch wire and the more complex wire bending, causing much difficulty in performing effective treatments. This made me invent Individual Indirect Bonding Technique with the use of multi-purpose set-up model in order to determine a correct and objective bracket position according to individual patients. This technique is more accurate than former indirect bonding techniques in bracket positioning, because it decides the bracket position on a set-up model which has produced to have the occlusal relationship the clinician desired. This technique is especially effective in straight wire appliance and lingual appliance in which the correct bracket positioning is indispensible.

The author has studied on the various diseases occurring in the oral and maxillofacial region for the year of 1987 at the Department of Oral & Maxillofacial Surgery, Seoul National University Hospital. The diseases diagnosed and treated have been analyzed according to each disease such as inflammatory, traumatic, cyst, tumor, neoplastic, deformities and so on, in order to get accurate information on the diseases of the oral & maxillofacial region and the information might be helpful to plan the education programmes for students, and interns and residents. The results obtained are as follows; 1. The sex distinction and the percentage of occurrence rate as follow Male 2090 (49.6%) Female 2127 (50.4%) 2. To study compare with the age, both male and female patients showed the highest ratio at the 20-29 age group, and the percentage of the 20-49 age group is 64.1% and the percentage of geriatric patients over 60 years old is 10.2%. 3. To study compare with the month (the patient came first time), August was most abundant in a year. 4. To study compare with the disease, dental-periodontal disease, impacted tooth and eruption abnormality are the most prevalent (51.2%), and next is odontogenic infection (22.4%), cyst & tumor (7.6%), traumatic injury (7.5%), and anomaly or deformity (3.8%). The number of medically compromised patients with oral surgery problems is 183 (4.3%). 5. Classifying the treatments according to the operator group, 1) For students(senior class), simple extraction showed the highest ratio, next is surgical extraction. 2) For interns, simple extraction showed the highest ratio, next is surgical extraction, pre-prosthetic surgery (alveoloplasty and vestibuloplasty).(ABSTRACT TRUNCATED AT 250 WORDS)

The purpose of this study was to evaluate the stress distributions to the abutments of a fixed partial denture with tilted molar abutments. In cases of the lower 1st molar being missing four 2-dimensional photoelastic models with 3- unit fixed partial dentures of which the 2nd molars were tilted 0 degrees, 10 degrees, 20 degrees and 30 degrees toward the 2nd premolar were made. A vertical load of 50 lbs was applied to the 1st and 2nd molar in each case. Two-dimensional photoelastic stress analysis was used, and the stress areas were recorded photographically. The results were as follows; 1. When the vertical load was applied to pontic and 2nd molar on the central fossae, the magnitude of stress distribution of the surrounding tissues of the root of the 2nd premolar was increased incrementally with increasing inclination. 2. Under two loading conditions, the stress distributions were directed to the long axis of the abutments. 3. In this experiment, no stress distributions were observed on the mesial area of the mesial root of the second molar.

The authors have studied on fluoride topical application effect clinically by using of fluoride ion applicator (F-ion) for the purpose of increasing dental caries prevention effect and desensitization efficiency of hypersensitive tooth. We have compared physical components of F-ion to Rivet ion and Pyocure which were made in Japan. And then, we have examined 40 extracted teeth applied 2% NaF solution with F-ion and calculated relative CaF2 production amounts by using of X-ray diffractometer after dividing total samples into 3 parts as control group, one time F-ion application group and 10 times F-ion application group. Otherwise, we have experimented 40 patients who have had hypersensitive teeth applying 10% SnF2 solution with the use of F-ion and found the patient's response for desensitization effects. The obtained results are as follows; 1. There were no obvious differences between F-ion fluoride applicator and other products, Rivet ion or Pyocure in aspect of physical components. 2. CaF2 production amounts were relatively higher in a group of one time 2% NaF application with the use of F-ion than those of control group as only fluoride solution applicated and it were the most in a group of 10 times fluoride application with the use of F-ion, through the examining by X-ray diffractometer, so it was estimated that F-ion technique of fluoride application would increase the fluoride penetration effect. 3. It was estimated that the desensitization effect for several application of 10% SnF2 solution with the use of F-ion would be recognized through the examination by Electro Pulp Tester and patient's response as 85.0% of desensitized persons. 4. The use of F-ion for increasing caries prevention and desensitization effect was recommended to dental clinics.