Journal of the korean academy of Pediatric Dentistry (대한소아치과학회지)
- Volume 26 Issue 2
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- Pages.207-217
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- 1999
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- 1226-8496(pISSN)
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- 2288-3819(eISSN)
RETENTIVE FORCES OF CLASPS OF REMOVABLE ORTHODONTIC APPLIANCES FOR CHILDREN
어린이에게 사용되는 가철식 교정장치용 clasp의 유지력비교
- Han, Jeong-Jae (Department of Pediatric Dentistry, College of Dentistry, Wonkwang University) ;
- Lee, Kwang-Hee (Department of Pediatric Dentistry, College of Dentistry, Wonkwang University) ;
- Kim, Dae-Eop (Department of Pediatric Dentistry, College of Dentistry, Wonkwang University)
- Published : 1999.05.31
Abstract
The purpose of this study was to compare the retentive forces of various types of clasps for removable orthodontic appliances for primary and mixed dentition. Seven metal models of a single tooth and two teeth were made, including maxillary left primary canine, first primary molar, second primary molar and first molar. Retentive forces of Adams clasp, circumferential clasp(C clasp), Jackson clasp, Duyzing clasp, arrowhead clasp, ball clasp, eyelet clasp, and triangular clasp were measured by Universal Testing Machine(Zwick Z020, Germany). The obtained results were as follows. 1. Jackson clasp and Adams clasp showed the highest retentive force among single tooth clasps. 2. C clasp showed the lowest retentive force, and there was no statistically significant difference in retentive force between mesial end C clasp and distal end C clasp. 3. Eyelet clasp showed the highest, and ball clasp showed the lowest retentive farce among clasps for interdental undercut. 4. Triangular clasp showed higher retentive force than ball clasp.
본 연구의 목적은 어린이에게 사용되고 있는 가철식 교정장치를 위한 clasp에 대하여 각 디자인간 유지력의 차이를 평가하고자 함이다. 상악 유견치와 제 1, 2유구치 및 제 1 대구치를 단일 치아모형과 두 개의 인접 치아 형태로 금속 주모형을 제작한 후 clasp를 종류에 따라 형성하여 각 모형에 대한 clasp의 유지력을 측정하였다. Clasp의 종류에 따른 유지력을 서로 비교하여 다음과 같은 결론을 얻었다. 1. 단일치아에서 유지력을 얻는 clasp중 Jackson clasp와 Adams clasp는 다른 clasp에 비하여 높은 유지력을 나타냈으며, C clasp는 가장 낮은 유지력을 나타냈다(p<0.05). 2. 두개 이상 치아의 치간부 undercut을 이용하는 clasp중 eyelet clasp가 가장 큰 유지력을 보여주었고 triangular clasp, ball clasp순으로 낮은 유지력을 보여주었다(p<0.05).