[The influence of masking agent on adhesion of composite resin]

In this study we used light cured resin,opaque resin and composite resin/masking agent to bond 24 teeth in vitro and then we tested their bonding stress.We also used these three materials to treat 240 tetracycline stained teeth in clinic.After half a year,one year,two years follow-up we found:in vitro study,the highest stress of composite resin is 144.3kG/cm(2).There is no significant difference in statistics among these three materials if we used the masking agent or opaque resin or not.In clinical follow-up,there is no significant difference in shed,partial shed,margin stain,gingival inflammation,and unsatisfied rate in three groups.The author believed the masking agent or opaque resin has no influence on the stress of resin restoration.So when we treated tetracycline stained teeth,we could choose it to increase aesthetic feeling.