RETENTIVE FORCES OF CLASPS OF REMOVABLE ORTHODONTIC APPLIANCES FOR CHILDREN

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Journal of the Korean Academy of Pediatric Dentistry 1999;26(2):207-217.
Published online May 31, 1999.

RETENTIVE FORCES OF CLASPS OF REMOVABLE ORTHODONTIC APPLIANCES FOR CHILDREN

어린이에게 사용되는 가철식 교정장치용 clasp의 유지력비교

한정재, 이광희, 김대업

원광대학교 치과대학 소아치과학교실

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.

Key Words: clasp, removable orthodontic appliance, retentive force