Flowable composite resin을 이용한 접착식 유지장치의 결합강도와 파절양상에 열순환이 미치는 영향
Effect of thermocycling on shear bond strength and mode of failure of bonded retainer using flowable composite resin
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이 연구는 flowable composite resin을 이용한 접착식 유지장치를 열순환시킨 후 결합강도와 파절양상을 조사하여 flowable composite resin이 접착식 유지장치의 레진 접착제로서 유용한지를 알아보기 위해 시행되었다. 교정치료를 목적으로 발거한 160개의 치아로 80개의 시편을 제작하고 40 개씩 두 군으로 나누어 접착식 유지장치를 제작하였다(Group G: 일반 복합레진인 CharmFil, Group F: flowable composite resin인 CharmFil Flow, wire: Tri-flex). 각 군을 20 개씩 2 개의 subgroup으로 나누었다(Subgroup 24: 생리식염수에 24 시간 동안 보관, Subgroup T: 37℃ 생리식염수에 24 시간 동안 보관한 후 5 ± 2℃ ~ 55 ± 2℃ 수조에 500회 열순환). 유지장치의 wire 중점에 수직전단력을 주면서 파절되는 순간의 하중을 측정하여 비교하였으며, 광학입체현미경으로 파절면을 관찰하여 파절양상을 비교하였다. 그 결과, 두 군의 전단결합강도 및 파절양상에는 통계학적으로 유의한 차이가 없었다. 따라서, 전단결합강도와 파절양상의 측면에서만 본다면 flowable composite resin을 유지장치의 레진 접착제로 충분히 적용시킬 수 있을 것으로 본다.
Abstract
The purpose of this study was to evaluate the effects of thermocycling on shear bond strength and mode of failure of orthodontic bonded retainer using flowable composite resin and to ascertain whether the flowable composite resin is useful for use as adhesive for orthodontic bonded retainers. One hundred and sixty freshly extracted human premolars were collected and eighty bonded retainer specimens were fabricated. They were randomly separated into 2 groups (Group G: general composite resin-CharmFil, Group F: flowable composite resin-CharmFil Flow, wire: Tri-flex). Each group was divided into 2 subgroups (Subgroup 24: stored in water at 37℃ for 24 hours for baseline data, Subgroup T: stored in water at 37℃ for 24 hours and thermocycled between 5 ± 2℃ and 55 ± 2℃ for 500 cycles before testing the in vitro shear bond strength). Shear bond strength was measured and mode of failure was evaluated with a stereomicroscope. There was no statistical difference in shear bond strength and mode of failure between the bonded retainer using general composite resin and flowable composite resin. Therefore, in considering shear bond strength and mode of failure, it is sufficient to use flowable composite resin as resin adhesives for bonded retainers.
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