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논문 기본 정보

자료유형
학술저널
저자정보
Jae-Chan Jung (Director Smileplus Dental Clinic Seongnam Republic of Korea) Sung-Hoon Lim (Chosun University) Seo-Rin Jeong (Department of Orthodontics School of Dentistry Chosun University Gwangju Republic of Korea)
저널정보
조선대학교 치의학연구원 Oral Biology Research Oral Biology Research 제46권 제2호
발행연도
2022.6
수록면
71 - 77 (7page)
DOI
10.21851/obr.46.02.202206.71

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초록· 키워드

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This study evaluated the effect of repetitive prestretching on hysteresis and abrupt force drops during the initial unloading phase (1-mm-unloading/peak force ratio) of elastomeric chains. Thirty samples of closed-type elastomeric chains were tested for each group of generation II power chain, energy chain, and memory chain. Elastomeric chains were elongated to a 100% extension from their original length of 12.5 mm and unloaded. Forces during the five loading and unloading cycles were determined. The memory chain showed significantly lower hysteresis than the generation II power chain and energy chain. Both loading and unloading forces were decreased significantly with repetitive prestretching. However, unloading forces decreased less than the loading force, thereby reducing the hysteresis. All three products showed the greatest hysteresis in the first cycle, which decreased significantly following repeated prestretching. The 1-mm-unload/peak ratio increased significantly until the 4th cycle, the cycle after triple prestretching. Conclusively, repetitive prestretching of elastomeric chains further decreased hysteresis and abrupt force drop during the initial 1-mm unloading, up to triple prestretching.

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