Colored TMA와 Self-ligation bracket에 관한 마찰저항력의 연구

Abstract

[한글]

본 연구는 새로 개발된 이온식립한 Colored TMA 선재와 self-ligation bracket에 관한 마찰력을 기존 재료와 비교하고자, .Ol8x.025 slot의 standard bracket 상에서 다양한 교정용 선재 및 크기 (stailess steel: .016, .Ol6x.022, .Ol7x.025, .018, NiTi : .016,.Ol6x.72, .Ol7x.025, .018, TMA: .016, .016x.022, .Ol7x.025, .018, Colored TMA: .016, .Ol6x.022, .017x.025), 결찰방식(self-ligation, elastomeric ligation stainless steel ligation), 브라켓 폭경(2.4mm, 3.4mm), 브라켓 각도 (O°, 5°)에 따라서 마찰력을 측정하여 다음과 같은 결과를 얻었다.

1. Colored TMA는 선재의 크기와 결찰 방법에 상관없이, TMA 보다는 마찰력이 적게 나타났고, Stainless Steel 선재와는 비슷하게 나타났다.

2. SPEED 브라켓의 self-ligation 방식이 .016, .018 교정선재에서는 elastomeric ligation과 stainless ligation방식(standard edgewise bracket)보다 마찰력이 적게 나타났으나, .Ol6x.022, .Ol7x.025 교정선재는 오히려 마찰력이 더 높게 나타났다.

3. 브라켓 (Dynalock elastomeric ligation)에 각도를 부여한 5°군에서, 마찰력이 각도를 부여하지 않은 O°군 보다 크게 나타났다.

[영문]

The propose of this study wIns to compare frictional forces about newly developed and ion implanted Colored TMA and self-ligation bracket. Also to compare with existing materials, variable sizes and different archwires(Stainless Steel archwire: 0.016 and 0.018 round, 0.016×0.022 and 0.017×0.025 rectangular, NiTi archwire: 0.016 and 0.018 round, 0.016×0.022 and 0.017x0.025 rectangular, Colored TMA archwire: 0.016 round 0.016×0.022 and 0.017x0.025 rectangular), different methods of ligation(stainless steel ligation, elastomeric ligation and

self-ligation), 2 different bracket width (2.4mm and 3.4mm), 2 different bracket angulation(0 and 5 degree) were used on the 0.018x0.025 slot size standard bracket.

Result were as follows:

1. Colored TMA showed similar frictional force with Stainless Steel archwire but it expressed significantly less friction compare to TMA archwire with no relation of archwire size and method of ligation.

2. Self-ligation Method(SPEED bracket) showed significantly less friction on 0.016 and 0.019 round archwire compare to elastomeric ligation and stainless steel ligation(standard edgewise bracket) but it expressed significantly more friction on

0.016×0.022 and 0.017×0.025 rectangular archwire.

3. M7Ke friction was significantly expressed with 5 degree angulated bracket(Dynalock elastomeric ligation) compare to the non-angulated bracket.