인산염계 기능성 단량체가 첨가된 수종의 자가 접착 레진시멘트와 지르코니아 세라믹 사이 열순환 전후 전단결합 강도 비교
Evaluation of shear-bond strength between different self-adhesive resin cements with phosphate monomer and zirconia ceramic before and after thermocycling
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목적: 본 연구에서는 서로 다른 인산염계 기능성 단량체가 첨가된 5종의 자가 접착 레진시멘트와 지르코니아 사이의 열순환 전후 전단결합강도를 비교 평가하고자 하였다. 재료 및 방법: Airborne particle abrasion (50 μm Al2O3)을 시행한 디스크 모양의 Y-TZP 지르코니아 블록을 총 100개 준비하였다. 그리고 composite resin cylinder (Filtek(TM) Z250, 3M ESPE, St. Paul, MN, USA) 100개를 준비하였다. 서로 다른 인산염계 기능성 단량체가 첨가된 5종의 이중 중합형 자가 접착 레진 시멘트 즉, Permacem 2.0 (DMG, Hamburg, Germany), Clearfil(TM) SA Luting (Kuraray Medical, Tokyo, Japan), Multilink Speed (Ivoclar Vivadent, Schaan, Liechtenstein), RelyX(TM) U200 Automix (3M ESPE, Neuss, Germany), G-Cem LinkAce(TM) (GC Corporation, Tokyo, Japan)를 이용하여 지르코니아 블록과 composite resin cylinder를 접착하고 1군당 20개의 시편을 갖는 5개의 군을 만들었다. 시편을 37℃ 의 증류수에 24시간 동안 보관한 후 각 군의 시편 절반(n=10)은 곧 바로 그리고 나머지 절반(n=10)은 5000회 열순환(5 - 55℃) 후에 전단결합강도를 측정하였다. 파절면은 FE-SEM을 이용하여 관찰하였다. 통계분석은 레진 시멘트 종류 및 열순환 유무에 따른 전단결합강도의 비교를 위해 Two/One-way ANOVA를 시행하고 Tukey HSD post-hoc test를 이용하여 사후 검정하였으며, 열순환 전후의 비교를 위해 paired t-test를 이용하였다(α=.05). 결과: 열순환 전과 후 모두 MultilinkSpeed 군은 나머지 4종류의 시멘트 군 보다 큰 전단결합강도를 나타내었다. G-Cem LinkAceTM 군은 열순환 전과 비교하여 열순환 후에 유의하게 낮은 전단결합강도를 나타내었지만, 다른 4종류 군은 열순환 전후 유의한 차이가 없었다. 결론: 인산염계 단량체를 포함한 대부분의 이중 중합형 자가 접착 레진시멘트는 지르코니아와 높은 전단결합강도를 보이고 열순환에 의해 유의한 영향을 받지 않아 지르코니아 보철물의 접착에 유용할 것이라고 사료된다.
Abstract
Purpose: This study compared shear bond strengths of five self-adhesive cements with phosphate monomer to zirconium oxide ceramic with and without airborn particle abrasion. Materials and methods: One hundred zirconia samples were air-abraded (50 ㎛ Al2O3). One hundred composite resin cylinders were fabricated. Composite cylinders were bonded to the zirconia samples with either Permacem 2.0 (P), ClearfilTM SA Luting (C), Multilink Speed (M), RelyX(TM) U200 Automix (R), G-Cem LinkAce(TM) (G). All bonded specimens were stored in distilled water (37℃) for 24 h and half of them were additionally aged by thermocycling (5℃, 55℃, 5,000 times). The bonded specimens were loaded in shear force until fracture (1 mm/min) by using Universal Testing Machine (Model 4201, Instron Co, Canton, MA, USA). The failure sites were inspected under field-emission scanning electron microscopy. The data was analyzed with ANOVA, Tukey HSD post-hoc test and paired samples t-test (α=.05). Results: Before and after thermocycling, Multilink Speed (M) revealed higher shear-bond strength than the other cements. G-Cem LinkAceTM (G) showed significantly lower bond strengths after thermocycling than before treatment (P<.05), but the other groups were not significantly different (P>.05). Conclusion: Most self-adhesive cements with phosphate monomer showed high shear bond strength with zirconia ceramic and weren't influenced by thermocycling, so they seem to valuable to zirconia ceramic bonding.
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