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각종 HEADGEAR 사용시 상악 제 1 대구치 치근에서의 응력과 치아이동에 관한 연구
신연미,한경윤 朝鮮大學校 口腔生物學硏究所 1991 Oral Biology Research (Oral Biol Res) Vol.15 No.-
The purpose of this study was to analyze the root stress and the tooth movement in the maxillary first, according to alterations in the length and inclination of the facebow of the cervical, straight-pull, and high-pull headgears. In addition, transpalatal arch was soldered, the results were compared. For this study, the two-dimentional finite element method and strain gauge method were used. The results were as follows ; 1. The stress and the tooth movement were more affected by the inclination changes of the outer bow than the length changes of the facebow. 2. Cervical headgear caused extrusion and distalization of the maxillary first molar, and the distalization was increased by down-inclination. 3. Straight-pull headgear caused extrusion and distalization of the maxillary first molar in the up outer bow, the greatest distalization in the straight outer bow, and intrusion and distalization in the down outer bow. 4. In strain gauge study, the stress in the alteration of the outer bow was ordered to down outer bow, up outer bow, and straight outer bow. 5. In finite element study, the cervical headgear caused stress consentration on the mesial and cervical area of the tooth. But lowering the outer bow and heightening the pulling direction, the stress at the distal area was increased. 6. In most cases, the stress after using the transpalatal arch was lower than that without transpalatal arch. But in the straight outer bow of the cervical headgear and down outer bow of the straight-pull and high-pull headgears, stress were increased.
Broussard"two force"technique 에 관한 고찰
김남수,손태원,신연미 朝鮮大學校 口腔生物學硏究所 1989 口腔生物學硏究 Vol.13 No.-
The Broussard two force technique is based upon the philosophy that one passive force-the main archwire-will establish and maintain harmony, symmetry, and arch coodination, while the removable auxiliary springs will provide the second, active force. These auxiliary springs, under the guidance and control of the main archwire, are used to move a tooth, a group of teeth, thereby producing many individual tooth movements. Suummary of the Broussard principle is as follows. 1. Edgewise control is possible at all times, and can be used to the degree needed, because a main archwire is alwasy used. 2. With the aid of the verical slot principle, auxiliary springs which work independent of the main archwire may be employed, to exert forces on tooth, or a group of teeth. 3. The activting force to move the teeth is not incoporated in the main archwire (in contrast with most of the light wire techniques) but it is provided by the auxiliary attachments. 4. These auxiliary springs then work under the guidance of the main arch wire, to produce definite and controlled tooth movements. 5. Thus, one tooth, or a group of teeth, may be selectively treated, without major archwire changes for each procedure. 6. In this manner, the main archire remains remains relatively undistorted and ideal in shape. 7. The main archwire is used to establish harmony, symmetry, and arch coordination, while these auxiliary forces are being exerted. 8. This represents the two force system. The headgear would represent the third force.
김남수,손태원,신연미 朝鮮大學校 口腔生物學硏究所 1989 口腔生物學硏究 Vol.13 No.-
Lingual appliances have evolved through several generations of design, reflecting many years of trial and error. The most recent lingual brackets incorporate an increased tie wing area for easier lagation and improved gingival clearance ; modified ball hooks, with slot ramps for improved lagation, elastic wear, and patient comfort ; reduced bracket size ; modified bite plane design ; and modified bracket base thicknesses to minimize 1st order bends. With these improvements, as well as the advancements made in the laboratory set-up and bonding procedures, the lingual technique can be readily incoporated into busy practice. Sucess depends on good patient communications, sound diagnostic principles, and proper treatment mechanics. Lingual patients must be well educated in oral hygiene. Oral hygiene instructions should cover the use of floss and floss threaders, dietary restrictions, a fluoride regimen, and routine prophylaxis. However predetermined formulas may not always be reliable. We must depend upon the experience and judgment of the orthodontist to make final determination.