오염된 유치 상아질에 대한 자가 부식 프라이머의 결합강도에 관한 연구

SHEAR BOND STRENGTH OF SELF-ETCHING PRIMER SYSTEMS TO CONTAMINATED DENTIN IN PRIMARY TEETH

연구목적은 자가부식 프라이머의 적용 시기에 따른 타액과 혈액 오염에 대한 결합력에 미치는 영향을 알아보는 것이었다. 유치 시편을 각각 10개씩 제작하여 대조군, 접착전 타액 오염, 접착제 중합후 타액 오염, 접착전 혈액 오염, 접착제 중합후 혈액 오염된 상황으로 2가지 종류의 자가부식 접착제와 복합레진을 적용하여 만능 물성 시험기로 전단결합강도를 측정, 분석하였다. 접착제 적용전 타액 오염(I군)시에는 대조군과 비교하여 결합력이 유사하거나 약간 감소되었으나, 통계학적 유의한 차이가 없었다(P>0.05). 접착후 타액 오염(II군)이나 접착 전후의 혈액 오염(III, IV군)시 유의하게 결합력이 감소하였다. (P<0.01). Clearfil SE Bond가 AQ Bond보다 유의하게 높은 결합강도를 보였다(P<0.05).

The purpose of this study was to determine and compare the shear bond strength of two self-etching primer systems to primary teeth contaminated with saliva and blood. Clearfil SE Bond and AQ Bond were evaluated. One hundred specimens were made by seventy-five deciduous teeth(fifty anterior and twenty-five posterior teeth) and divided randomly into ten groups. Small flat dentinal surfaces were prepared by grinding the buccal, lingual and labial areas. Specific surface treatments were applied to each group: (1) a self-etching primer application(control group), (2) saliva contamination followed by primer(Group I), (3) primer curing followed by saliva contamination (Group II), (4) blood contamination followed by primer(Group III), (5) primer curing followed by blood contamination(Group IV). After bonding of composite resin(Z100, 3M, USA) to contaminated sample surfaces and thermocycling(1,000 cycles), shear bond strengths were measured using Universal Testing Machine(Zwick Z020, Zwick Co., Germany). The results were as follows; 1. Group I showed lower shear bond strength than control group but no statistically significant difference was found(P>0.05). 2. Group II and blood contamination group(Group III & IV) showed significantly lower shear bond strength than control group(P<0.01). 3. The shear bond strength of Clearfil SE Bond was significantly higher than that of AQ Bond(P<0.05).