The study of marginal microleakage of filling materials in vitro

SUN Pei; YU Xiao-fei; ZHANG Hui; ZHAO Hong-Mei

Abstract：Objective To compare the marginal microleakage of four filling materials and provide an experimental evi-dence for clinical application. Methods Sixty freshly extracted human molars were randomly divided into six groups (10 molars in each group). A group(A1,A2)was filled with FiltekTM Z250,B1 group was filled with KetacTM N100 and B4 with F2000 Compomer,the last two groups(B2,B3)were respectively filled with KetacTM Molar Easymix. A2 group was coated with Adper Single Bond 2,and B3 group with vaseline. After thermal cycling,the depth that dye penetrated was measured between the restorations and the tooth structure. Statiscal analysis was done. Results Restorative A2 group had the least microleakage(P<0.05). The microleakage of KetacTM Molar Easymix(B2)was more than other mate-rials(P<0.05). Significant differences were observed between A2,B2 and other four groups(A1,B1,B3,B4). There was no difference among B1,B3,B4 and A1 specimens(P > 0.05). Conclusion The two protective agents can in-cerease the edge closeness of glass ionomer cement filling. It may be most beneficial to use resin-modified glass-iono-mer,polyacid modified resin composites and resin compsites as the restorative material.